var path = require('path');
var utils = require('bbhverse');
var any = utils.any;
var Tasq = utils.Tasq
var statuslog = utils.Traq
var Traq = utils.Traq
Tasq.addlistener(statuslog.statuslog)
var cli = require('./cliverse')
var nodeShellExec = cli.nodeShellExec;
var chalk = require('chalk')


const BUILD_VERSION = '[VI]Version: {version} - built on {date}[/VI]';
const runtimestamp = (new Date()).getTime();
function getVersion() { return BUILD_VERSION; }
console.log(getVersion());

// 'use strict';

// PB : TODO -- make sure folder context is proper coz we can now run elxr from anywhere.

// PB : TODO -- 
// runas bypass non elevated tasks when we request privelege
// runas message is always error needs to be fixed.
// runas wait needs to be parallelized.
// suppress elevation check error messages
// support runas lauched directly from shell.
// pass in environment in hta to shellexecute.

// PB : NOTE -- iife doesnt work if previous statement is not terminated by ;
(function () {
  "use strict";
  if (!Array.prototype.earlyreduce) {
    Array.prototype.earlyreduce = function(eachcallback, initialValue, donecallback){
      var iterable = this;
      var donecallback = donecallback || (a=>a)
      var result = { value : initialValue === undefined ? iterable[0] : initialValue };
      initialValue === undefined ? null : result = eachcallback(result, element, i, iterable);
      // function *earlyReduceGenerator(acc, v, i, a) {
        for(var i = initialValue === undefined ? 0 : 1; i < iterable.length; i++){
          var element = iterable[i]
          result = eachcallback(result, element, i, iterable)
          if(result.done) return donecallback(result)
        }
      // }
      return donecallback(result)
    }
  }
}());

const { existsSync } = require('fs');
const fs = require('fs')

const cliargs = utils.cliargs;
const processedArgs = cliargs(process.argv.slice(2));
console.dir(processedArgs)
// PB : TODO -- defaults for valuless arguments if passed.
// Object.keys(processedArgs).forEach(a=>{
//   if(Object.prototype.toString.call(processedArgs[a]) === '[object Undefined]' || !processedArgs[a]) || trim(processedArgs[a])) == '') {

//   }
// })

var clioverrides = { }
processedArgs._[1] ? clioverrides.instanceName = processedArgs._[1]: null;
processedArgs.node_env ? clioverrides.node_env = processedArgs.node_env 
                                : (process.env.NODE_ENV && process.env.NODE_ENV.trim()) 
                                    ? clioverrides.node_env = (process.env.NODE_ENV && process.env.NODE_ENV.trim()) : null;

Object.keys(clioverrides).forEach( prop => { })

var globSync = require('glob').sync;

var ENV = Object.assign({}, process.env); // Shallow clone it.

const { readdir } = require("fs").promises

// Directory shallow walk and do perform on each dir.
const dirs = async (perform, path) => {
  for (const dir of await readdir(path || process.cwd(), { withFileTypes: true })) {
    if (dir.isDirectory()) perform(dir)
  }
}

var getShellTask = (command, args, options) => {
  options = options || {}
  var callshell = command === 'rm' ? callgitbashtask : callsheltask;
  return () => {
    var p = callshell( [command, args, Object.assign({
        inherit: true, shell: true, env: ENV, title: `${command} ${args}`
      }, options)
    ])
    if (options.ignorefailures) {
      return p.catch(e => {
        // Ignore. Not a major error.
      })
    }
    else return p;
  }
}

var callsheltask = (args) => { 
  return args[0] === 'rm' ? callgitbashtask(args) : () => { return nodeShellExec.apply(null, args) } }
var callgitbashtask = (args) => { return () => { 
  return nodeShellExec( `"${gitbash}"`, ['-c', `"${args[0]} ${args[1].join(' ')}"`], args[2]) } 
}

var getTaskCheckExists = (command, options) => {
  options = options || {}
  return () => {
    var p = nodeShellExec.apply(null, ['where', [command]])
    if (options.ignorefailures) {
      return p.then(() => { return true }).catch(e => { // Ignore. Not a major error.
        return false;
      })
    }
    else return p.then(() => { return true });
  }
}

var getTaskWithElevation = function(tasdef){
  return ()=>{
    if (__isElevated) { 
      return tasdef.elevatedpulltasks().then(()=>{
        // PB : TODO -- Every elevation should have its own messaging file. Async writes from multiple processes are a problem here...
        fs.writeFileSync('run.done', 'success')
      }).catch(e=>{
        fs.writeFileSync('run.done', 'failure')
      });
    }
    else {
      // PB : TODO -- Rename op['runas'] to 'elevate'

      var __runasresult = null;

      return op['runas']().then((r) => { return __runasresult = r; })
        .catch((e) => {
          console.error(e)
        })
        .finally(() => {
          if(__runasresult && !__runasresult.skipped) fs.unlinkSync('run.done')
          if (!processedArgs.runas) {  return tasdef.regularpulltasks(); }
        })
    }
  }
}

var getTaskWithoutElevation = function(tasdef){
  return ()=>{
    if(!processedArgs.runas) {  return tasdef.regularpulltasks(); }
    else Promise.resolve(true)
  }
}

var gitops = {

  getdiscoverbranchcmd : function(repo){

    var parameters = ['-c', 'branch=`git rev-parse --abbrev-ref HEAD`;for i in `git remote`; do git pull $i $branch; done;']
    var cmd = [gitbash
      , ['-c', 'branch=`git rev-parse --abbrev-ref HEAD`;for i in `git remote`; do git pull $i $branch; done;']
      , { cwd: instanceroot + '/' + repo, title: 'pull all origins for ' + repo + ' ' + parameters.join(' ') }]
    return cmd
  }
}

var getPullCmd = (repo, branch) => {
  // console.log(useGitPull)var getPullCmd = (repo, branch) => {
  // console.log(useGitPull)

  // var pullCmd = [gitInstallDir
  //   , ['-c', 'branch=`git rev-parse --abbrev-ref HEAD`;for i in `git remote`; do git pull $i $branch; done;']
  //   , { cwd: instanceroot + '/' + repo, title: 'pull all origins for ' + repo }]
  if(branch) {
    var parameters = ['-c', 'for i in `git remote`; do git pull $i ' + branch + '; done;']
    var pullCmd = [ gitbash
      , ['-c', 'for i in `git remote`; do git pull $i ' + branch + '; done;']
      , { cwd: instanceroot + '/' + repo, title : 'pull all origins for ' + branch + '  ' + repo + ' ' + parameters.join(' ') }]
  }
  else {
    // console.warn('No branch was specified detecting from working client.')
    // First check if working client exits.
    // if (existsSync(instanceroot + '/' + repo)) {
      var pullCmd = gitops.getdiscoverbranchcmd(repo)
    // }
    // else performpull
  }
  // var pullCmd = ['pullall', [], { cwd : repo }]
  if (useGitPull) pullCmd = ['git', ['pull'], {
    inherit: true, shell: true,
    cwd: instanceroot + '/' + repo
    // , env: process.env
    , runas: processedArgs.runas
    , title: `git pull ${repo}`
  }]
  return pullCmd
}

var performPull = (repo, branch) => {
  // PB : TODO -- Handle no branch passed in case.
  // if(!branch) { throw 'No branch specified' }

  if (existsSync(instanceroot + '/' + repo)) {
    var branchprint =  branch ? ' branch :' + branch  : '';
    console.log('pulling ' + instanceroot + '/' + repo + branchprint )
    return nodeShellExec.apply(null, getPullCmd(repo, branch)).then(() => {
            if (__isElevated) {
        fs.writeFileSync('run.log', ', ' + JSON.stringify({ repo, success: true }), { 'flag': 'a+' })
      }
      else statuslog.statuslog(null, repo)
      return true;
    })
    .catch((e) => {
      e.repo = repo;
      if (__isElevated) {
        fs.writeFileSync('run.log', ', ' + JSON.stringify(e), { 'flag': 'a+' })
      }
      else statuslog.statuslog(e); console.error(e)
    })
  }
  else {
    console.log('cloning ' + repo)
    // PB : TODO -- detect if a clonable repo exists in currentGitAuthUser
    return nodeShellExec('git', ['clone', '-c', 'core.symlinks=true', selectedinstance.reposerver + `/${defaultRepoOwner}/` + repo + '.git'],
      {
        inherit: true, shell: true,
          env: process.env
        , cwd : instanceroot 
        , runas: processedArgs.runas
      }).catch((e) => {
        throw e;
      }).then(() => {

        return nodeShellExec('git', ['config', '--replace-all', 'core.symlinks', true],
          {
            inherit: true, shell: true,
            env: process.env
            , cwd: instanceroot + '/' + repo
            , runas: processedArgs.runas
            , title: `git core.symlinks --replace-all true for ${selectedinstance.reposerver + `/${defaultRepoOwner}/` + repo + '.git'}`
          })
          .then(() => {
            if (__isElevated) {
              fs.writeFileSync('run.log', ', ' + JSON.stringify({ repo, success: true }), { 'flag': 'a+' })
            }
            else statuslog.statuslog(null, repo)
          })
          .catch((e) => {
            e.repo = repo;
            if (__isElevated) {
              fs.writeFileSync('run.log', ', ' + JSON.stringify(e), { 'flag': 'a+' })
            }
            else statuslog.statuslog(e);
          })
      })
      .catch(e => {
        e.repo = repo;
        if (__isElevated) {
          fs.writeFileSync('run.log', ', ' + JSON.stringify(e), { 'flag': 'a+' })
        }
        else statuslog.statuslog(e);
      })
  }
}

// PB : TODO -- If we are run from an elevated shell it never moves forward and simply exits.
// -- Currently workaround is to always run from a non-elevated shell.
var __isElevated = null; // We assume non-Elevated until someone evaluates and sets this variable.
var acquireElevationState = () => {
  if (__isElevated === null) {
    return nodeShellExec("fsutil", ["dirty", "query", "C:"], {
      inherit: true
      // , shell: true
      , stdio: 'ignore'
      , env: process.env
      , title: `check privileged execution mode using "fsutil dirty query C:"`
    }).then((exitcode) => {
      console.log('Elevated')
      __isElevated = true;
      return true;
    }).catch(() => {
      __isElevated = false;
      console.log('Not Elevated');
      return false;
    });
  }
  else return Promise.resolve(__isElevated);
}


var currentGitAuthUser; // nodeShellExec('git', ['config', 'user.email']) ... PB : TODO-- get the current gittea username 
var defaultRepoOwner = 'chess';
var elevatedRunasRepos = null
var gitRepos = null

// grep -qxF 'alias elxr="node elxr/index.js"'  ~/.bash_profile || echo 'alias elxr="node elxr/index.js"' >> ~/.bash_profile


// nodeShellExec('echo', ['elxr'], { inherit : true}) //, {stdio: "inherit"}

var dbForLabel = function (label) {
  var dbsForLabel = {
    devmysql: 'mysql'
    , development: 'mssql'
    , production: 'mssql'
  }
  return dbsForLabel[label] || 'mysql'
}

// SAM : TODO Use nodeshellexec where to detect git installation dir
var gitbash = "C:\\Program Files\\Git\\bin\\sh.exe"
// var gitbash = "G:\\Installed\\Git\\bin\\sh.exe"
// Relevant git repos
var exludeMergeRepos = [];
var useGitPull = processedArgs.useGitPull || false;
var configPromise = null

// elxr cli operations
var op = {
  'h': () => { console.log(elxr.help()); return '-h' }
  , 'clean' : () => {
    // delete all node_module folders and links.
    var tasklist = [];
    dirs( (repodir)=> tasklist.push(getShellTask('rm',['-rf', 'node_modules'], { cwd : instanceroot + '/' + repodir.name })()), instanceroot )
    return Promise.all(tasklist)
  }
  , 'undefined': () => { return op.h(); }
  , 'reset': () => {

    // Reset NPM packages semver so major versions can be updated.

    const fs = require('fs')
    const wipeDependencies = (__package) => {
      const file = fs.readFileSync(__package + '/package.json')
      const content = JSON.parse(file)
      for (var devDep in content.devDependencies) {
        if (content.devDependencies[devDep].match(/\W+\d+.\d+.\d+-?((alpha|beta|rc)?.\d+)?/g)) {
          content.devDependencies[devDep] = '*';
        }
      }
      for (var dep in content.dependencies) {
        if (content.dependencies[dep].match(/\W+\d+.\d+.\d+-?((alpha|beta|rc)?.\d+)?/g)) {
          content.dependencies[dep] = '*';
        }
      }
      fs.writeFileSync(__package + '/package.json', JSON.stringify(content))
    }

    var repos = ['client'];
    // repos = gitRepos;
    repos.forEach(wipeDependencies)
    // if (require.main === module) {
    // } else {
    //   module.exports = wipeDependencies
    // }

  }
  , 'upgrade': () => {
    console.log('upgrade.......')
    var tasks = [
      () => {
        var p = nodeShellExec('npm', ['i', '-g', 'npm-upgrade'], {
          inherit: true, shell: true
          , env: process.env
        }).catch((e) => { console.error(e) })
        p.position = 1;
        console.log('One')
        return p;
      }
      , () => {
        var p = nodeShellExec('npm', ['cache', 'clean', '-f'], {
          inherit: true, shell: true
          , env: process.env
        }).catch((e) => { console.error(e) })

        p.position = 2;
        console.log('Two')
        return p;
      }
      , () => {
        var p = nodeShellExec('npm', ['install', '-g', 'n'], {
          inherit: true, shell: true
          , env: process.env
        }).catch((e) => { console.error(e) })
        p.position = 3;
        console.log('Three')
        return p;
      }
      , () => {
        var p = nodeShellExec('n', ['latest'], {
          inherit: true, shell: true
          , env: process.env
        }).catch((e) => { console.error(e) })
        p.position = 4;
        console.log('Four')
        return p;
      }
    ]
    any(tasks)
    console.log('.......done')
    console.log('Running exlr upgrade in : ' + path.dirname(__dirname))
    console.log('Currently only upgrades ember : ' + path.dirname(__dirname));
    console.info('Uninstalling existing ember globally');
    var step1 = nodeShellExec('cmd', ['/c', 'npm', 'uninstall', '-g', 'ember-cli'], {
      stdio: ['pipe', process.stdout, process.stderr],
      inherit: true,
      shell: true,
      cwd: path.dirname(__dirname),
      env: env
    })
    step1.on('close', () => {
      console.info('Installing ember globally');
      var step2 = nodeShellExec('cmd', ['/c', 'npm', 'install', '-g', 'ember-cli'], {
        stdio: ['pipe', process.stdout, process.stderr],
        inherit: true,
        shell: true,
        cwd: path.dirname(__dirname),
        env: env
      })

      step2.on('close', () => {
        nodeShellExec('cmd', ['/c', 'ember', '--version'], {
          stdio: ['pipe', process.stdout, process.stderr],
          inherit: true,
          shell: true,
          cwd: path.dirname(__dirname),
          env: env
        })
      })
    })
  }
  , 'runas': () => {

    if(processedArgs.skipelevated) return Promise.resolve({ skipped : true });

    console.log('Testing Elevation')

    if (__isElevated) {
      try {
        op[processedArgs.label || processedArgs._[0] || 'h']()
      }
      catch (e) {
        console.error('Error Invalid command : ' + e)
        fs.writeFileSync('run.done', 'error')
      }
      finally {
      }
    }
    else {
      console.log('Requesting Elevated Privileges');
      // Wait for the runas to complete before we read it.
      try {
        fs.unlinkSync('run.done')
        fs.unlinkSync('run.log')
      }
      catch (e) { } //Ignore 

      // Find node path to send to hta.
      return nodeShellExec('where', ['node']).then(r => {
        var namedArgs = [];
        console.log('result : ' + JSON.stringify(r))
        Object.keys(processedArgs).forEach((v) => { v != '_' ? namedArgs.push('--' + v + '=' + processedArgs[v]) : null; })
        // PB : TODO -- Convert all the cli args back to string.
        var args = [`${selectedinstance.root}/.elxr/run-${runtimestamp}/windowselevate.hta`].concat(processedArgs._).concat(namedArgs.join(' ')); args.push('--runas=self');
        args.push('--nodepath=' + r[r.length - 1])
        if (!processedArgs.node_env) args.push('--node_env=' + ENV.NODE_ENV)
        if (processedArgs.debug) args.push('--debug=true') // Enable to debug elevated..

        return nodeShellExec('MSHTA', [`"${args.join('" "')}"`]
          , {
            inherit: true
            , shell: true
            , env: ENV
            , runas: 'self'
            , title: `runas`
          }
        ).then(() => {
          // runas returned.
          try {
            // PB : TODO -- Log is comma prefixed. Needs to be proper JSON.
            var runaslog = JSON.parse('[ { "success" : true, "result" : "started"}' + fs.readFileSync('run.log', { flags: 'a+' }) + ']');
            runaslog.forEach((logEntry) => {
              statuslog.statuslog(logEntry.success ? null : logEntry, logEntry)
              logEntry.success ? (console.log(['success :' + logEntry.result]), console.log((logEntry.messages || []).join(' '))) : (console.error(['error :' + logEntry.result]), console.error((logEntry.messages || []).join(' ')))
            })
          }
          catch (e) {
            // We must have a runas log
            statuslog.statuslog(e)
            console.error('Run log error probably was not created by runas : ' + e)
          }
        })
          .catch(err => console.error('Elevation failed : ' + err));
      })

    }
  }
  , 'push': () => {
    if (!processedArgs._[1]) { console.error('push all not supported. Specify repo name'); return }
    // init remote bare from local
    // pushandinitremotebare
    // https://www.jeffgeerling.com/blogs/jeff-geerling/push-your-git-repositories
    // connect to repo server -- net use 172.16.0.27 
    // cd 172.16.0.27/repos/
    // mkdir repo.git
    // cd repo.git
    // git init --bare
    // cd localrepo
    // git remote rename origin githubclone
    // git remote add origin //172.16.0.27/repos/repo.git
    // git push origin master

    var repo = processedArgs._[1];

    var sequentialTaskShellCommands = [];
    if (!existsSync(`Z:/${repo}.git`)) {
      sequentialTaskShellCommands = [
        // ['net', ['use', 'Z:', selectedinstance.reposerver.replace('/','\\')], {
        //   inherit : true, shell: true
        //   , env: process.env
        // }]
        ['pwd', { cwd: 'Z:', inherit: true }]
        , ['mkdir', [`${repo}.git`], {
          cwd: `Z:`
          , inherit: true, shell: true
          , env: process.env
        }]
        , ['pwd', { cwd: `Z:/${repo}.git`, inherit: true }]
        , ['git', ['init', '--bare'], {
          cwd: `Z:/${repo}.git`
          , inherit: true, shell: true
          , env: process.env
        }]
        // PB : TODO -- Do this conditionally only...
        , ['git', ['remote', 'rename', 'origin', 'githubclone'], { cwd: `${instanceroot + '/' + repo}` }, (err) => {
          console.log('Ignoring origin rename error : ' + err); return true; //return true to continue.
        }] // PB ; Todo -- new repositories created locally will not have origin. Handle this failure.
        , ['git', ['remote', 'add', 'origin', `${selectedinstance.reposerver}/${repo}.git`], { cwd: `${instanceroot + '/' + repo}` }]
        // PB : TODO -- If threre is a gitbubclone origin 
        // Set the master to pull from the local repo.
      ]
      if (!existsSync(`Z:`)) {
        sequentialTaskShellCommands.splice(0, 0, ['net', ['use', 'Z:', selectedinstance.reposerver.replace(/\//gm, '\\')], {
          inherit: true, shell: true
          , env: process.env
        }])
        console.warn('Adding network drive z: for repo server. ' + sequentialTaskShellCommands[0])
        // throw 'done'
      }
    }

    sequentialTaskShellCommands.push(['git', ['push', 'origin', 'master'], { cwd: `${instanceroot + '/' + repo}` }])
    // console.dir(sequentialTaskShellCommands);

    var tasks = [];
    sequentialTaskShellCommands.forEach(shellcmd => {
      // console.log(shellcmd)
      tasks.push(() => {

        var p = nodeShellExec.apply(null, shellcmd.slice(0, 3)).catch((e) => { if (shellcmd[3]) { return shellcmd[3]() } else { console.error(e); } })
        return p;
      })
    })
    any(tasks);

  }
  , 'is-git-repo': (dir) => {
    return nodeShellExec('git', ['-C', dir.name, 'rev-parse'], { stdio: 'ignore' })
  }
  // git remote equivalents...
  // git branch --set-upstream-to=elixir-unc/master master
  // git push --set-upstream elixir-unc branch..
  , 'remote': (args) => { 
    
    // Subcommands!
    if(!processedArgs.v) return false; // Only -v is supported presently..

    var serial_perform = (repo) => {
      var options = { cwd: instanceroot + '/' + repo }
      
      return [
        ['git', ['remote', '-v'], options]
      ]
    }

    var x = (args) => {
      var tasq = () => {
        // console.log(args)
        return nodeShellExec.apply(null, args).catch(e => {
          // We continue on failure.
          console.error(tasq.toString())
        })
      }
      tasq.toString = function(){
        return JSON.stringify(args)
      }
      return tasq;
    }

    var perform = (dir) => {
      return any(serial_perform(dir.name).map(x))
    }

    dirs(perform)
  }

  , 'remote set-url': (args) => {
    // git remote set-url elixir-unc //10.10.5.60/gitrepo/chess/bbhverse
    var __args = {
      remotename : args.remotename || processedArgs._[2]
      , url : args.url || processedArgs._[3]
    }

    // pushable doesn't mean the remote doesn't support being pushed to. 
    // Over here it just means we are disabling pushing to that remote by setting the push portion of the url the a junk remote called no-pushing. 
    // PB : TODO -- change this to enablepushing.
    // By default pushing should be disabled. Also developers permissions on the remote is a secondary check for pushing.
    var pushable = processedArgs.pushable || false;
    remotename = __args.remotename
    url = __args.url
    var serial_perform_git_seturl = (repo) => {
      var options = { cwd: instanceroot + '/' + repo }
      // console.log(repo)
      if (pushable) {
        return [
          ['git', ['remote', 'set-url', remotename, url + '/' + repo], { cwd: instanceroot + '/' + repo }]
          , ['git', ['remote', `set-url`, '--push', remotename, url + '/' + repo], { cwd: instanceroot + '/' + repo }]
        ]
      }
      else {
        return [
          ['git', ['remote', 'set-url', remotename, url + '/' + repo], { cwd: instanceroot + '/' + repo }]
          , ['git', ['remote', `set-url`, '--push', remotename, 'no-pushing'], { cwd: instanceroot + '/' + repo }]
        ]
      }

    }

    var x = (args) => {
      var tasq = () => {
        // console.log(args)
        return nodeShellExec.apply(null, args).catch(e => {
          // We continue on failure.
          console.error(tasq.toString())
        })
      }
      tasq.toString = function(){
        return JSON.stringify(args)
      }
      return tasq;
    }
    var perform_git_seturl = (dir) => {
      op['is-git-repo'](dir).then((logEntry) => {
        return any(serial_perform_git_seturl(dir.name).map(x))
      }).catch((e) => {
        // console.log('Failed : ' + dir.name)
      })
    }

    dirs(perform_git_seturl)
  }
  , 'reset' : ()=>{ 
    // Reset the whole installation pertaining to this elxr folder.
    
  }
  , 'remote add': (args) => {
    // PB : TODO -- set-upstream-to should be chosen and intentionally switched. Coz we can have multiple upstream remotes.
      // Also each upstream remote may need to have is own branch to switch to. We therefore need a branch nomenclature
      // That explicitly has a remote name prefix.
      // git branch branch_name --set-upstream-to your_new_remote/branch_name
      // git branch branch_name -u your_new_remote/branch_name -- older versions
      // git branch -vv -- Detect which branch are we tracking.
      // default upstream should be users own fork.
      // Also need alias branches to 
        // define a git alias which would git pull master from one repo, and then git pull master from other remotes.
        // probably git merge from all remotes... and relevant branches...
    // alias pushall='for i in `git remote`; do git push $i; done;'
    // alias pullall='for i in `git remote`; do git pull $i; done;'
    // args === processedArgs ? args = {} : null;
    var __args = {
      remotename : args.remotename|| processedArgs._[2]
      , url : args.url || processedArgs._[3]
      , branch : args.branch || processedArgs._[4]
    }
   
    var remotename = __args.remotename
    var url = __args.url
    var branch = __args.branch

    var pushable = processedArgs.pushable || false;


    var serial_perform_git_add = (repo) => {
      var options = { cwd: instanceroot + '/' + repo }
      // console.log(repo)
      if (pushable) {
        return [
          ['git', ['remote', 'add', remotename, url + '/' + repo], { cwd: instanceroot + '/' + repo }]
          , ['git', ['pull', remotename, branch], { cwd: instanceroot + '/' + repo }]
          , ['git', ['branch', `--set-upstream-to=${remotename}/${branch}`, branch], { cwd: instanceroot + '/' + repo }]
        ]
      }
      else {

        return [
          ['git', ['remote', 'add', remotename, url + '/' + repo], { cwd: instanceroot + '/' + repo }]
          , ['git', ['remote', `set-url`, '--push', remotename, 'no-pushing'], { cwd: instanceroot + '/' + repo }]
          , ['git', ['pull', remotename, branch], { cwd: instanceroot + '/' + repo }]
          , ['git', ['branch', `--set-upstream-to=${remotename}/${branch}`, branch], { cwd: instanceroot + '/' + repo }]
        ]
      }

    }
    var x = (args) => {
      return () => {
        // console.log(args)
        return nodeShellExec.apply(null, args)
      }
      // return Promise.resolve(true)
    }
    var perform_git_add = (dir) => {
      op['is-git-repo'](dir).then((logEntry) => {
        // console.log(code)
        if (logEntry.success) {
          nodeShellExec('git', ['remote', 'get-url', remotename], { cwd: dir.name, stdio: 'ignore' }).then(() => {
            console.log('skipped : ' + dir.name + ', reason : A remote with same name already exists.')
          })
          .catch((e) => {
            any(serial_perform_git_add(dir.name).map(x))
          })
        }
        // else console.log('Skipped : Not a Git Repo : ' + dir.name)
      }).catch((e) => {
        console.log('Failed : ' + dir.name)
      })
    }

    const { readdir } = require("fs").promises
    
    dirs(perform_git_add)
  }
  , 'remote remove': (args) => {
    
    var __args = {
      remotename : args.remotename|| processedArgs._[2]
    }
    var remotename = __args.remotename
    var serial_perform_git_remove = (repo) => {
      var options = { cwd: instanceroot + '/' + repo }
      // console.log(repo)
      return [
        ['git', ['remote', 'remove', remotename], { cwd: instanceroot + '/' + repo }]
      ]
    }
    var x = (args) => {
      return () => {
        // console.log(args)
        return nodeShellExec.apply(null, args)
      }
      // return Promise.resolve(true)
    }
    var perform_git_remove = (dir) => {
      op['is-git-repo'](dir).then((logEntry) => {
        // console.log(code)
        if (logEntry.success) {
          nodeShellExec('git', ['remote', 'get-url', remotename], { cwd: dir.name, stdio: 'ignore' }).then(() => {
            any(serial_perform_git_remove(dir.name).map(x))
          })
            .catch((e) => {
              console.log('skipped : ' + dir.name + `, reason : No remote named ${remotename}`)
            })
        }
        // else console.log('Skipped : Not a Git Repo : ' + dir.name)
      }).catch((e) => {
        // console.log('Failed : ' + dir.name)
      })
    }

    const { readdir } = require("fs").promises

    dirs(perform_git_remove)
  }
  , 'init-gitea': (user) => {
    user = user || processedArgs._[1]
    if (!user) throw 'User name required'
    var serial_perform_init_gitea = (repo) => {
      var options = { cwd: instanceroot + '/' + repo }
      // console.log(repo)
      return [
        ['git', ['remote', 'add', 'chess', `${selectedinstance.reposerver}/${user}/${repo}.git`], { cwd: instanceroot + '/' + repo }]
        , ['git', ['remote', 'set-url', '--push', 'chess', 'no-pushing'], { cwd: instanceroot + '/' + repo }]
        , ['git', ['remote', 'set-url', 'origin', `${selectedinstance.reposerver}/${user}/${repo}.git`], { cwd: instanceroot + '/' + repo }]
      ]
    }
    var x = (args) => {
      return () => {
        // console.log(args)
        return nodeShellExec.apply(null, args)
      }
      // return Promise.resolve(true)
    }
    var perform_init_gitea = (dir) => {
      op['is-git-repo'](dir).then((logEntry) => {
        // console.log(code)
        if (logEntry.success) {
          nodeShellExec('git', ['remote', 'get-url', 'chess'], { cwd: dir.name, stdio: 'ignore' }).then(() => {
            console.log('skipped : ' + dir.name + ', reason : Already has remote chess ')
          })
            .catch((e) => {
              any(serial_perform_init_gitea(dir.name).map(x))
            })
        }
        // else console.log('Skipped : Not a Git Repo : ' + dir.name)
      }).catch((e) => {
        // console.log('Failed : ' + dir.name)
      })
    }

    const { readdir } = require("fs").promises

    dirs(perform_init_gitea)
  }
  , 'syncmaster': (label) => {
    // Usage :
    // elxr pull -- Defaults to run config

    var env = Object.assign({}, process.env); // Shallow clone it.
    // console.dir(env)
    console.log('Running exlr pull : ' + path.dirname(__dirname))

    if (!processedArgs.runas) gitRepos.map((def) => performPull(def.repo, def.branch || 'master'))
    if (__isElevated) {
      return any(elevatedRunasRepos.map((def) => performPull(def.repo, def.branch || 'master'))).then(() => {
        fs.writeFileSync('run.done', 'success')
      }).catch(() => {
        fs.writeFileSync('run.done', 'error')
      })
    }
    else return op['runas']()
  }

  , 'repo-relocate' : function(args){
    // relocate a subfolder in source repo to same subfolder in target repo with history. 

    var args = args || {
        remotebase : processedArgs._[4] || 'http://git.bbh/chess/'
      , folder : processedArgs._[3] || 'server'
      , sourcerepo : processedArgs._[2] || 'client'
      , targetrepo : processedArgs._[1] || 'elixir-server'
    }
    var sourcerepooptions = { cwd: `${instanceroot}/relocate/${args.sourcerepo}`
      // , stdio: ['pipe', process.stdout, process.stderr]
      , inherit: true,
        shell: true,
        env: process.env
      , runas: processedArgs.runas
    }

    return op['repo-split'](args).then(()=>{
      return op['repo-merge'](args).then(()=>{
        
        // cleanup folder from source.
        var cmdseq = [
            ['rm', ['-rf', `${args.folder}`], sourcerepooptions ]
          // commits have to intentional...
          // , ['git', ['commit', '-a', '-m', `relocate folder ${args.folder} to ${targetrepo}`], sourcerepooptions ]
        ]

        return any(cmdseq.map(callsheltask))
      })
    }).catch(e=>{console.error(e)})
  }

  , 'repo-split' : function(args) {
    
    // https://gist.github.com/smdabdoub/17065c348289158277b5
    
    /**
     * Eg : folder, remotebase, sourcerepo, targetrepo
     *  args.folder = 'server'
     *  args.remotebase = 'https://git.bbh/chess/'
     *  args.sourcerepo = 'client'
     *  args.targetrepo = 'elixir-server'
     */

    var args = args || {
        folder : 'server'
      , remotebase : 'http://git.bbh/chess/'
      , sourcerepo : 'client'
      , targetrepo : 'elixir-server'
    }

    var options = { cwd: `${instanceroot}/relocate`
      // , stdio: ['pipe', process.stdout, process.stderr]
      ,  inherit: true,
        shell: true,
        env: process.env
      , runas: processedArgs.runas
    }
    
    var cmdseq = [
        // create a temporary working dir in current folder where we started execution.
        ['mkdir', [ '-p', 'relocate']]
      , ['git', ['clone', `${args.remotebase}${args.sourcerepo}`], options ]
      , ['git', ['clone', `${args.sourcerepo}`, `relocate-${args.sourcerepo}-${args.folder}`], options]
      , ['git', ['clone', `${args.remotebase}${args.targetrepo}`, `relocate-${args.targetrepo}-${args.folder}`], options]
    ]
      
    return any(cmdseq.map(callsheltask)).then(() => { 
      // , ['git', ['subtree', 'split', '-P', `${args.folder}`, '-b', `relocate-${args.sourcerepo}-${args.folder}`], sourcerepooptions] 
        // split doesnt retain folder structure we need to move and commit ourselves through a branch to retain history... 
          // , ['git', [`checkout relocate-${args.sourcerepo}-${args.folder}`], sourcerepooptions] 
          // , ['mkdir', [`${args.folder}`], sourcerepooptions]
          // , ['git', ['mv', `!(${args.folder})`, `${args.folder}`], sourcerepooptions ] // requires  shopt -s extglob
          // , ['git', ['commit', `-m`, 'Moved to same subfolder after subtree split in branch'] , sourcerepooptions]
          
      
      // subtree split and filter-branch are options. We currently use repo-filter. 
      return  op['filter-repo'](args)
    }).catch(e=>{console.error(e); throw 'failed'})
  }

  , 'repo-merge' : function(args) {
    // Merge source repo into target repo
    var args = args || {
        folder : 'server'
      , remotebase : 'http://git.bbh/chess/'
      , sourcerepo : 'client'
      , targetrepo : 'elixir-server'
    }

    var sourcerepooptions = { cwd: `${instanceroot}/relocate/relocate-${args.sourcerepo}-${args.folder}`
      // , stdio: ['pipe', process.stdout, process.stderr]
      , inherit: true,
        shell: true,
        env: process.env
      , runas: processedArgs.runas
    }
    var targetrepooptions = { cwd: `${instanceroot}/relocate/relocate-${args.targetrepo}-${args.folder}` 
      // , stdio: ['pipe', process.stdout, process.stderr]
      , inherit: true,
        shell: true,
        env: process.env
      , runas: processedArgs.runas
    }

    var cmdseq = [
        ['git', ['pull', `../relocate-${args.sourcerepo}-${args.folder}`, `master`, '--allow-unrelated-histories'] 
          , targetrepooptions ]
      // , ['git', ['push', targetrepooptions ] // manual push for now..
    ]
    return any(cmdseq.map(callsheltask)).catch(e=>{console.error(e)})
  }

  , 'filter-repo' : function(args){
      // Merge source repo into target repo
      var args = args || {
          folder : 'server'
        , remotebase : 'http://git.bbh/chess/'
        , targetrepo : 'elixir-server'
      }
  
      var targetrepooptions = { cwd: `${instanceroot}/relocate/relocate-${args.sourcerepo}-${args.folder}` 
        , inherit: true, shell: true
        , env: process.env
        , runas: processedArgs.runas
      }

      var cmdseq = [
        // git checkout -b feature/merge-old-project
              // git remote add src-project ../src-project
        ['git', ['filter-repo', '--path', `${args.folder}`], targetrepooptions ]
      ]
      return any(cmdseq.map(callsheltask)).catch(e=>{console.error(e); throw 'failed' })
  }

  , 'filter-branch' : function(preservefolder, repo){
    // https://stackoverflow.com/questions/359424/detach-move-subdirectory-into-separate-git-repository
    // git subtree split -P <name-of-folder> -b <name-of-new-branch>
    // Preserve a specific folder.
    // PB : TODO -- filter-branch has known issues. Explore subtree and filter-repo...
    /*
    git clone repo reposplit
    git filter-branch --tag-name-filter cat --prune-empty --subdirectory-filter {{folder}} -- --all 
    git remote rm origin
    */

    throw 'filter-repo-history not yet implmented pls refer to manual commands in code.'
  }

  // , 'repo-merge-folder' : function(mergetarget, mergesource, mergefolder){
  //   // Merge repo2 into a subfolder in repo1
  //   // https://alexharv074.github.io/puppet/2017/10/04/merge-a-git-repository-and-its-history-into-a-subdirectory-of-a-second-git-repository.html
  //   // https://thoughts.t37.net/merging-2-different-git-repositories-without-losing-your-history-de7a06bba804
  //   /*
  //     cd repo1
  //     git remote add -f tempmergesource ../{{mergesource}}/.git
  //     git merge -s ours --no-commit tempmergesource/master --allow-unrelated-histories
  //     git read-tree --prefix={{mergefolder}} -u tempmergesource/master:
  //     git commit

  //     // Repair History
  //     // === git filter-branch --tree-filter '(echo === $GIT_COMMIT:; git ls-tree $GIT_COMMIT) >> /tmp/tree.log'
          
  //             #!/usr/bin/env bash

  //                       first=ed4f16becc2f03820c164e0617bb98f12ff49ef0
  //                       last=038e26e21bd60fa265d6637261f3bc918780d2e8
  //                       subdir=server

  //                       git filter-branch --tree-filter '
  //                         first='"$first"'
  //                         last='"$last"'

  //                         subdir='"$subdir"'
  //                         log_file=/tmp/filter.log

  //                         [ "$GIT_COMMIT" = "$first" ] && seen_first=true

  //                         if [ "$seen_first" = "true" ] && [ "$seen_last" != "true" ]; then
  //                           echo "=== $GIT_COMMIT: making changes"
  //                           files=$(git ls-tree --name-only $GIT_COMMIT)
  //                           mkdir -p $subdir
  //                           for i in $files; do
  //                             mv $i $subdir || echo "ERR: mv $i $subdir failed"
  //                           done
  //                         else
  //                           echo "=== $GIT_COMMIT: ignoring"
  //                         fi \
  //                           >> $log_file

  //                         [ "$GIT_COMMIT" = "$last" ] && seen_last=true

  //                         status=0  # tell tree-filter never to fail
  //                       '

  //     git remote rm tempmergesource
  //   */
  //   // better alternative for history
  //   /**
  //    * 
  //     git clone git@server.com:old-project.git
  //     git clone git@server.com:new-project.git
    
  //     cd old-project
  //     mkdir old-project
  //     git mv !(old-project) old-project
  //     ls -la and gt mv hidden files ....
  //     git commit -a -S -m “Moving old project into its own subdirectory”
    
  //     cd ../new-project
  //     git remote add old-project ../old-project
  //     git fetch old-project
  //     git checkout -b feature/merge-old-project
  //     git merge -S --allow-unrelated-histories old-project/master
  //     git push origin feature/merge-old-project
  //     git remote rm old-project
  //   */  

  //   throw 'merge-repos not yet implmented pls refer to manual commands in code.'
  // }

  , 'pull' : (label) => {
    // Usage :
    // elxr pull -- Defaults to run config

    return elxr.getpulltask(selectedinstance)()
  }
  , 'isInstalled': () => {
    return nodeShellExec('where', [processedArgs._[1]], { inherit: true }).then(() => {
      console.log(processedArgs._[1] + ' exists.')
      return true;
    });
  }
  , 'i' : () => {

    var tasks = []
    // tasks.push(op['pull']);
    tasks.push(getShellTask.apply(null, ['rm', [instanceroot + '/run.js'], { ignorefailures: true }]))
    tasks.push(op['use'])
    if (!__isElevated) {
      tasks.push(op['npmi'])
    }

    // var tasksdefs = [
    //     ['elxr', ['pull']]
    //   , ['elxr', ['use', 'elixir']]
    //   , ['elxr', ['npmi']]
    // ]


    // tasksdefs.forEach(tasksdef=>{
    //   tasks.push( ()=> nodeShellExec.apply(null, tasksdef) )
    // })

    return any(tasks);

  }
  , 'npmi': () => {
    var tasks = [];

    // Build fails without babel...
    tasks.push(getShellTask(
      'npm',[ 'i', '-g', 'babel-cli' ]
    ) )

    var npmbuildrepos = ['loopback-jsonapi-model-serializer']
    npmbuildrepos = []
    npmbuildrepos.forEach(repo => {
      tasks.push(() => {
        return nodeShellExec('npm', ['i --force'], {
          inherit: true, shell: true
          , cwd: instanceroot + '/' + repo
          , env: process.env
          , title: `npm i for ${repo}`
        }).catch((e) => {
          console.error('Ignoring Benign Error'); console.error(e);
        }).then(() => {
          console.log(`--npm run build for ${repo}--------------------`)
          return nodeShellExec('npm', ['run build'], {
            inherit: true, shell: true
            , cwd: instanceroot + '/' + repo
            , env: process.env
            , title: `npm run build for ${repo}`
          }).then(Tasq.then).catch(Tasq.catch)
        })
      })
    })

    any(tasks).then(() => {

      gitRepos.push('client/server');
      gitRepos = gitRepos.concat(elevatedRunasRepos);

      // gitRepos = [
      //   // 'bbhverse', 'serververse', 'elixir-server', 
      //   // 'clientverse', 
      //   'client'
      // ];
      var rmtasks = []
      var repotasks = []
      var env = Object.assign({}, process.env)
      delete env.NODE_ENV
      gitRepos.forEach(repodef => {

        rmtasks.push(
          // () => {
            // console.log(`--rm package-lock.json for ${repodef.repo}--------------------`)
            // return nodeShellExec(`"${gitbash}"`, ['-c', '"rm  package-lock.json"'], {
            (callShellTask(['rm', ['package-lock.json'], {
              inherit: true, shell: true
              , cwd: instanceroot + '/' + repodef.repo
              , env: process.env
              , title: `rm 'package-lock.json' for ${repodef.repo}`
            }]))()
            .then(()=>{
              console.log(`--rm package-lock.json for ${repodef.repo}--------------------`)
            }).catch((e) => { console.error(e) })
          // }
        )

        if (npmbuildrepos.indexOf(repodef.repo) < 0) {
          repotasks.push(
            () => {
              console.log(`--npm i for ${repodef.repo}--------------------`)
              var p = nodeShellExec('npm', ['i', '--force'], {
                inherit: true, shell: true
                , cwd: instanceroot + '/' + repodef.repo
                , env
                , title: `npm i for ${repodef.repo}`
              }).then(Tasq.then).catch(Tasq.catch)  
              return p;
            })
        }
      })


      // PB : NOTE -- npm i for client does not complete when NODE_ENV=production 
      // therefore bower doesn't get installed !!! which then fails installing the bower dependenciew !!!
      // We work around this by running npm i for client without any NODE_ENV which probably defualts to development.
      // PB : TODO -- Investigate why NODE_ENF has an impact on npm i !??
      // Second time try also doesnt work.
      // repotasks.push(
      //   () => {
      //     var env = Object.assign({}, process.env)
      //     delete env.NODE_ENV
      //     console.log(`--------------------second time npm i for client--------------------`)
      //     return nodeShellExec(`"${gitbash}"`, ['-c', '"npm i --force"'], {
      //     // return nodeShellExec('npm', ['i --force'], {
      //       inherit: true, shell: true
      //       , cwd: instanceroot + '/' + 'client'
      //       , env
      //       , title: `npm i for client`
      //     }).then(Tasq.then).catch(Tasq.catch)
      //   })

      var bowerRepos = [{ repo : 'client'}]
      bowerRepos.forEach(repodef => {
        repotasks.push(() => {
          console.log(instanceroot + '/' + repodef.repo + '/node_modules/bower/bin/bower')
          // var p = nodeShellExec('node_modules/bower/bin/bower', ['install'], {
          var p = nodeShellExec(`"${gitbash}"`, ['-c', '"node_modules/bower/bin/bower i"'], {

            inherit: true, shell: true
            , cwd: instanceroot + '/' + repodef.repo
            , env: process.env
            , title: `bower i for ${repodef.repo}`
          }).then(Tasq.then).catch(Tasq.catch)
          return p;
        })
      })
      // console.log('rmtasks.length : ' + rmtasks.length)
      return Promise.all(rmtasks).then(() => any(repotasks));
    }).catch(e => {

    }).finally(statuslog.finally)

  }
  , 'start': (label) => {
    console.log('Starting Elixir Server.');
    var env = Object.assign({}, process.env); // Shallow clone it.
    // console.dir(env)
    env.NODE_ENV = process.env.NODE_ENV || 'development';
    env.DEBUG = 'loopback:connector:' + dbForLabel(label)
    var cmd = env.NODE_ENV === 'development' ? 'nodemon' : 'node';
    // cmd = 'node'
    cmd = [cmd, ['--inspect=9228', 'elixir/server.js']]
    var childPromise = nodeShellExec(...cmd, {
      // inherit : true,
      shell: true,
      detached: true,
      stdio: 'ignore',
      cwd: instanceroot + '/' + 'elixir-server'
      , env: env
    })

    var child = childPromise.process;
    if (typeof child.pid !== 'undefined') {
      console.log(`started Elixir Server PID(${child.pid}) : NODE_ENV=${process.NODE_ENV} ${cmd}`);
      fs.writeFileSync('.elixir-server.elixir.server.pid', child.pid, {
        encoding: 'utf8'
      })
    }

    // nodeShellExec('node', ['--inspect=9226', ' bin/www'], {
    //   inherit : true, 
    //   shell: true, detached: true,
    //   cwd : 'qms/server',
    //   env: env,
    //   shell : true
    // })

    // nodeShellExec('ember', ['s'], {
    //   // inherit : true, 
    //   shell: true, detached: true,
    //   cwd : 'client/',
    //   env: env
    // })
    console.log('Starting Elixir Client Host.');
    var cmd = ['ember', ['s']]
    var childPromise = nodeShellExec(...cmd, {
      // var childPromise = nodeShellExec('node', ['--inspect=9227', './node_modules/.bin/ember', 's'], {
      // PB : TODO -- ember debugging.
      // inherit : true,
      shell: true,
      detached: true,
      stdio: 'ignore',
      cwd: instanceroot + '/' + 'client'
      , env: env
    })
    // .catch(e=>console.error(e))

    child = childPromise.process;
    if (typeof child.pid !== 'undefined') {
      console.log(`started Elixir Client Host PID(${child.pid}) : NODE_ENV=${process.NODE_ENV} ${cmd}`);
      fs.writeFileSync('.client.server.pid', child.pid, {
        encoding: 'utf8'
      })
    }

  }
  , 'stop': (label) => {
    const kill = require('tree-kill');

    var serverPid = fs.readFileSync('.elixir-server.elixir.server.pid', {
      encoding: 'utf8'
    })
    fs.unlinkSync('.elixir-server.elixir.server.pid')
    console.log(serverPid)
    kill(serverPid)

    serverPid = fs.readFileSync('.client.server.pid', {
      encoding: 'utf8'
    })
    fs.unlinkSync('.client.server.pid')
    console.log(serverPid)
    kill(serverPid)
  }
  , 'model' : () => {
    if (__isElevated) { 
      var tasks = [
        () => {
          var p = nodeShellExec('mklink', [ `${processedArgs._[2]}.json`
              , `..\\..\\node_modules\\chess-server-lib\\common\\models\\${processedArgs._[2]}.json`], {
            inherit: true, shell: true
            , cwd : instanceroot + `/${selectedinstance.instanceName}-server/${selectedinstance.instanceName}/models`
            , title: `mklink  ${processedArgs._[2]}.json ..\\..\\node_modules\\chess-server-lib\\common\\models\\${processedArgs._[2]}.json`
            , env: process.env
          }).catch((e) => { console.error(e) })
          return p;
        }
      ];
      return any(tasks).then(() => {
        fs.writeFileSync('run.done', 'success')
      }).catch(() => {
        fs.writeFileSync('run.done', 'error')
      })
    }
    else return op['runas']()
  }
  , 'use' : () => {
    // use a certain named instance.
    //  Eg : 
    // 1) elxr use elixir
    // 2) elxr use cihsr
    // If environment is not specified defaults to development.
    // 1) NODE=test elxr use elixir

    /*// Steps
    1) Delete Config and Data symlinks
    2) Make Links for config ({{name}}-config-{{node_env}}) and data with the NODE_ENV specified or default to dev 
    3) Iterates all repos and pull all. 'git', ['pull', '--all'].
    4) Iterates all repos and checkout to the ENV specified. 'git', ['checkout', checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV]
    5) Iterates all repos and merge from source configured in mergesource. 'git', ['merge', mergesource],
    */
    var runconfig = { NODE_ENV: selectedinstance.node_env }
    try { runconfig = Object.assign(runconfig, require(instanceroot + '/run.js')) } catch (e) { }
    // We no longer need to check ruans.. ??? if we were initiated from self invoked privileged shell ?
    if (( /*processedArgs.runas && processedArgs.runas !== 'self' &&*/ !processedArgs.force) &&
      runconfig.NODE_ENV && runconfig.NODE_ENV === (selectedinstance.node_env || runconfig.NODE_ENV) &&
      selectedinstance.instanceName && runconfig.use === selectedinstance.instanceName) {

      console.log(`No change detected. Already using requested specs : ${runconfig.NODE_ENV} ${runconfig.use}`)
      if (processedArgs.runas) { fs.writeFileSync('run.done', 'success') }
      return
    }

    var tasks = [
      () => {
        if (existsSync('config')) {
          var p = nodeShellExec('rmdir', ['config'], { inherit: true, shell: true, env: process.env }
          ).catch((err) => { console.log('Ignoring benign error : ' + err); return true; })
          return p;
        }
        else return Promise.resolve(true);
      },
      () => {
        if (existsSync('data')) {
          var p = nodeShellExec('rmdir', ['data'], { inherit: true, shell: true, env: process.env }
          ).catch((err) => { console.log('Ignoring benign error : ' + err); return true; })
          return p;
        }
        else return Promise.resolve(true);
      },
    ];
    runconfig.NODE_ENV = process.env.NODE_ENV = process.env.NODE_ENV || runconfig.NODE_ENV || 'development';
    if (processedArgs._[1] && runconfig.use !== processedArgs._[1]) runconfig.use = processedArgs._[1];
    if (!runconfig.use) { throw 'unspecifed use not allowed. Please specify chess instance name.' }
    // console.log(process.env.cwd)
    fs.writeFileSync(instanceroot + '/run.js', 'module.exports = ' + JSON.stringify(runconfig))

    // Maps an environment to a branch. Not required if the branch is appropriately named.
    var checkoutMap = { 'development': 'master' }

    var branch = checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV
    
    var performPullOrCloneForBranch = (def)=>{
      var promise = Promise.resolve(true)
      if (!branch) {
        var dscoverbranchcmd = gitops.getdiscoverbranchcmd(repo)
        
        promise = nodeShellExec.apply(null, dscoverbranchcmd(repo)).then(__branch=>{ branch = __branch})
          .catch((e) => { console.error(e); return { error: true, message: repo } })
  
      }
        
      return promise = promise.then(()=>{ return elxr.getpulltask(def)() }).catch(e => { console.error( 'performPullOrCloneForBranch : Failed ' + e )})
    }

    var performCloneAndCheckout = null;
    // cant use git checkout -b it fails when branch already exists.
    var performCheckout = performCloneAndCheckout = (def) => {if (excludeCheckouts[def.repo]) return Promise.resolve({ 'skipped': true })
      
      return performPullOrCloneForBranch(def).then(()=>{
        nodeShellExec('git', ['checkout', def.branch || checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV], {
          // return nodeShellExec('git', ['switch', '-m', '-C', checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV], {
          // inherit : true, shell: true, 
          cwd: instanceroot + '/' + def.repo
          // , stdio : ignore // Use when we want to silence output completely.
          , runas: processedArgs.runas
          , title: `git checkout ${def.branch || checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV} for ${def.repo}`
        }).then(()=>{ console.log( `SUCCESS : git checkout ${def.branch || checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV} for ${def.repo}` ) }).catch((e) => { console.error(e); return { error: true, message: def.repo } })
      })
    }

    // var enqueueCheckout = function(def){ enqueue(elevatedqueue, performCheckout, def) }
    // var enqueueMerge = function(def){ enqueue(elevatedqueue, performMerge, def) }

    var elevatedqueue = [];
    var enqueueOnce = (queue, task, def) => {
      var found = queue.find(element => { 
        var keys = Object.keys( element ) 
        for(var k=0; k < keys.length; k++) { 
          if(element[keys[k]] !== def[k]) return false;
        } 
      })
      queue.push(function(){ return task(this)}.bind(def));
    }
    var enqueue = (queue, task, def) => {
      queue.push(function(){ return task(def)}.bind(def));
    }

    var mergeSources = {
      'development': null,
      'test': 'master',
      'production': 'master'
    }
    var mergesource = mergeSources[checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV]

    // Checkout is reduced to pull provided the current branch is the targetbranch 
    if(branch === mergesource) performCheckout = (def) => {   
      var dscoverbranchcmd = gitops.getdiscoverbranchcmd(repo)
      return nodeShellExec.apply(null, dscoverbranchcmd(repo)).then(__branch=>{ 
        
        if(branch === __branch) return performCloneAndCheckout(def)
        return performPullOrCloneForBranch(def) 
      })
      .catch((e) => { console.error(e); return { error: true, message: repo } })
    }
    // else performCheckout = (def) => { return performPullOrCloneForBranch(def) }

    var performPullAll = (def) => {
      if (excludeCheckouts[def.repo]) return Promise.resolve({ 'skipped': true })
      return nodeShellExec('git', ['pull', '--all'], {
        // inherit : true, shell: true, 
        cwd: instanceroot + '/' + def.repo
        , runas: processedArgs.runas
        , title: `git pull -all for ${checkoutMap[runconfig.NODE_ENV] || runconfig.NODE_ENV} ${def.repo}`
      }).catch((e) => { console.error(e); return { error: true, message: def.repo } })
    }
    
    var excludeCheckouts = Object.assign(exludeMergeRepos)
    delete excludeCheckouts[`elixir-config-${runconfig.NODE_ENV}`]
    delete excludeCheckouts[`cihsr-config-${runconfig.NODE_ENV}`]

    var performMerge = (def) => {
      if (exludeMergeRepos[def.repo]) return Promise.resolve({ 'skipped': true })
      return nodeShellExec('git', ['merge', mergesource], {
        inherit: true, shell: true,
        cwd: instanceroot + '/' + def.repo
        , runas: processedArgs.runas
      }).catch((e) => { console.error(e) })
    }
    if(!mergesource || branch === mergesource) performMerge = () => { return Promise.resolve(true) }

    // var performRepoOperation = function(def) {
    //   elevatedRunasRepos.map((repo) => enqueueCheckout({ repo, branch: def.branch, requiresElevation : true }))
    //   return any(gitRepos.map((repo) => performCheckout({ repo, branch: def.branch})))
    // }

    return any(tasks).then(() => {
      var pr = Promise.resolve(true)
      if (!__isElevated)  {
        pr = op['runas']()
        return pr.then(()=>{

          //target is the env is we specify in elxr use command. Default is dev
            //Switch to target branch
          return any(gitRepos.map((repodef) => { return performCheckout({ repo : repodef.repo, branch}).catch(e=>{ console.log(e); }) }   ))
          // pull or clone target branch
          .then(() => {
            if(!mergesource || branch === mergesource) return Promise.resolve(true)
            return any(gitRepos.map((repo) => performPullAll(repo))) 
          })
          // switch to source branch
          .then( () => {
              if(!mergesource || branch === mergesource ) return Promise.resolve(true)  // Dont do anything if there is no source to merge from.
              return any(gitRepos.map((repodef) => performCheckout({ repo : repodef.repo, branch: mergesource}))) 
          })
          //Pull on merge source branch
          .then( () => {
              if(!mergesource || branch === mergesource ) return Promise.resolve(true)
              return any(gitRepos.map((repo) => performPullAll(repo)))
            })
          //Switch to target branch
          .then( () => { 
            if(!mergesource || branch === mergesource ) return Promise.resolve(true)
            return any(elevatedRunasRepos.map((repodef) => performCheckout({ repo : repodef.repo, branch}))) 
          })
          .then( //Merge source branch to target branch
            () => {
              if(!mergesource || branch === mergesource) return Promise.resolve(true)
              return any(gitRepos.map((repo) => performMerge( repo ))).catch(err => { console.error('error in performMerge ' + err) })
            })
        })
      }
      else {
        tasks = [
          () => {
            // Use junctions to avoid npm package issues
            var p = nodeShellExec('mklink', ['/J', 'config', runconfig.use + '-config' + '-' + process.env.NODE_ENV], {
              inherit: true, shell: true
              , cwd : instanceroot
              , env: process.env
            }).catch((e) => { console.error(e) })
            return p;
          }
        ];
        if (processedArgs._[1]) {
          tasks = tasks.concat(
            [
              () => {
                var p = nodeShellExec('mklink', ['/J', 'data', runconfig.use + '-data'], {
                  inherit: true, shell: true
                  , cwd : instanceroot
                  , env: process.env
                }).catch((e) => { console.error(e) })
                return p;
              }
            ]
          )
        }
  
        return any(tasks).then(()=>{
              // checkout target branch
          return any(elevatedRunasRepos.map((repodef) => performCheckout({ repo : repodef.repo, branch, requiresElevation : true}))) 
            // pull or clone target branch
            .then(() => {
              if(!mergesource || branch === mergesource) return Promise.resolve(true)
              return any(elevatedRunasRepos.map((repo) => performPullAll(repo))) 
            })
            // switch to source branch
            .then( () => {
              if(!mergesource || branch === mergesource) return Promise.resolve(true)
              return any(elevatedRunasRepos.map((repodef) => performCheckout({ repo : repodef.repo, branch: mergesource, requiresElevation : true}))) 
            })
            //Pull on merge source branch
            .then( () => {
              if(!mergesource || branch === mergesource) return Promise.resolve(true)
                return any(elevatedRunasRepos.map((repodef) => performPullAll({repo : repodef.repo, requiresElevation : true })))
              })
            //Switch to target branch
            .then( () => { 
              if(!mergesource || branch === mergesource) return Promise.resolve(true)
              return any(elevatedRunasRepos.map((repodef) => performCheckout({ repo : repodef.repo, branch, requiresElevation : true}))) 
            })
            .then( //Merge source branch to target branch
              () => {
                if(!mergesource || branch === mergesource) return Promise.resolve(true)
                return any(elevatedRunasRepos.map((repodef) => performMerge({ repo : repodef.repo, requiresElevation : true }))).catch(err => { console.error('error in performMerge ' + err) })
            })
            .then(() => {
              fs.writeFileSync('run.done', 'success')
            }).catch(() => {
              fs.writeFileSync('run.done', 'error')
            })
        })
      }

    }).catch(() => {
      fs.writeFileSync('run.done', 'error')
    })

    // Antibiotic stewardship program.
    // 1st use is fine.
    // Max vials dispense
    // 2nd use Pharmacy needs justification Form.
    // Approval after a certain period of time.
  }
  , 'g': () => {
    if (processedArgs.h) {

      console.log('elxr g [modelname] => generate a model named [modelname]');
      console.log('elxr g => regenerate all known models');
      return
    }
    // var child = nodeShellExec('mkdir', ['-p', label], { inherit : true} );
    // console.log('Starting directory: ' + process.cwd());
    // try {
    //     child = child.on('close', () => { process.chdir(label) } );
    //     console.log('New directory: ' + process.cwd()); 
    // }
    // catch (err) {
    //     console.log('chdir: ' + err);
    // }
    // child.on('close', function(){
    // var options = {
    //       shell : true 
    //     , inherit : true
    //     // , cwd : '' + process.cwd
    //     // , env : process.env
    // };
    // nodeShellExec('git', ['init'], { inherit : true});
    if (0) {
      // PB : TODO -- Special google chrome profile for tests etc.
      nodeShellExec('pwd', { inherit: true });
      // /c/Program\ Files\ \(x86\)/Google/Chrome/Application/chrome.exe --user-data-dir=/c/chess/instances/elixir_01/data/Google/Chrome/User\ Data --profile-directory="chess"
      // "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --user-data-dir="C:\chess\instances\elixir_01\data\Google\Chrome\User Data" --profile-directory="chess" http://localhost:4200/admin/crud/create/item
      // "C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --user-data-dir="C:\chess\instances\elixir_01\data\Google\Chrome\User Data" --profile-directory="chess" http://localhost:4200/tests/index.html?grep=loopback
      nodeShellExec("C:/Program Files (x86)/Google/Chrome/Application/chrome.exe", [
        "--profile-directory=Profile 1"
        , 'http://localhost:4200/tests/index.html?grep=model convert ember to loopback' + '&filter=none' /*+ '&filter=model convert ember to loopback'*/]);

    }
    // nodeShellExec('npm', ['init', '-y'], options);
    // nodeShellExec('npm', ['init', '-y'], options);
    // })

    var g = {
      'client': () => {
        // ember new --skip-bower --no-welcome --skip-git -b {{blueprint}} 

        console.info('Creating new ember client named : ' + processedArgs._[2]);
        var step1 = nodeShellExec('cmd', ['/c', 'ember', 'new', processedArgs._[2]], {
          stdio: ['pipe', process.stdout, process.stderr],
          inherit: true,
          shell: true,
          cwd: path.dirname(__dirname),
          env: env
        })
      },

      'modelr': () => {
        var tasks = [
          () => {
            var p = nodeShellExec('"ember"', [
              'g'
              , 'modelr'
              , processedArgs._[2]], {
              inherit: true, shell: true, env: process.env
            }).then(() => {
              console.log('Blueprint generation complete for : ' + processedArgs._[2])
              return true;
            }).catch((e) => { console.error(e) })
            return p;
          },
          () => {
            var chromePrefsFile = "C:\\chess\\instances\\elixir_01\\data\\Google\\Chrome\\User Data\\chess\\Preferences";
            var chromeprefs = fs.readFileSync(chromePrefsFile, { encoding: 'utf8' })
            chromeprefs = JSON.parse(chromeprefs)
            var previous = chromeprefs.download.default_directory;
            var parentDir = path.dirname(__dirname);
            chromeprefs.download.default_directory = parentDir + "\\client\\app\\templates\\components\\resource";
            fs.writeFileSync(chromePrefsFile, JSON.stringify(chromeprefs))
            // PB : TODO -- detect where chrome is installed.
            // PB : TODO -- set the download dir to the place where files are needed.
            var p = nodeShellExec('"C:/Program Files (x86)/Google/Chrome/Application/chrome.exe"', [
              '--user-data-dir="C:\\chess\\instances\\elixir_01\\data\\Google\\Chrome\\User Data"'
              , '--profile-directory="chess"'
              , 'http://localhost:4200/admin/crud/create/' + processedArgs._[2]], {
              inherit: true, shell: true
              , env: process.env
            }).then(() => {
              chromeprefs.download.default_directory = previous;
              fs.writeFileSync(chromePrefsFile, JSON.stringify(chromeprefs))
              return true;
            }).catch((e) => { console.error(e) })
            return p;
          }
          ,
          () => {
            console.log('Browser process should have closed here....')
            return true;
          }
        ]
        any(tasks)

      }

    }

    g[processedArgs._[1]]();
  }
}

var util = require('util');
var cliname = 'elxr';
var ver = '1.1';
var readme = `
  Command syntax examples

  elxr
    Displays help. Same as elxr h

  elxr i
    Runs interactive propmts to help choose installation options.

  NODE_ENV={{yourenvironment}} elxr {{cmd}} {{instancename}} {{otheroptions}}
    General command syntax.
    Eg: NODE_ENV=development elxr pull elixir

    Note : Although {{instancename}} is generally a positional parameter supplied immediately after the cmd for most cmd's. 
      The specific cmd defines what the value is interpreted as.
      There are several cmds that do not require an {{instancename}} parameter.
        Eg: elxr remote remove origin 
          Git operations or passthrough external commands on all repository folders in you working directory.

  Main objectives.
    elxr cli is a wrapper around other shell commands and api based operations.
    One of the main objetives it achives is ease of use of repeating an individual cmd multiple times on all targets.
      Eg: A git operation like pull can be repeated consistently on a set of git repositories.
  
`;
var help = `
  ${readme}


  # list of commands... please refer dveloper documentation for ${cliname}
  ${
  // util.inspect(
  [Object.keys(op)]
  // )
  }
`;

var elxr = {
  help() {
    return chalk.cyanBright(`
-------------------------------------------------------------------------------
  *** BBH Elixir ***  
-------------------------------------------------------------------------------
  elxr ${ver}
    A cli tool for chess
    ${help}
-------------------------------------------------------------------------------
  `)
  }
  , info() {
    return chalk.cyanBright(`
-------------------------------------------------------------------------------
  *** BBH Elixir ***  
-------------------------------------------------------------------------------
  elxr ${ver}
    A cli tool for chess
-------------------------------------------------------------------------------
  `)
  }
  , getpulltask(def){

    // def can be an instance config
    // Or an object with many repos and elevated repos
    // Or a single repo ( Either Elevated or normal. )


    def = def || {
      repos : selectedinstance.repos,
      elevated : selectedinstance.elevated
    }

    var elevatedpulltasks = null;
    if(def.repo) {
      // Single repo case.
      if(def.repo.requiresElevation) {
        elevatedpulltasks = function() {
          return performPull(def.repo).then(() => {
            return true;
          }).catch((e) => {
            console.error(e) 
          })
        }
        return 
      }
      else {
        var regularpulltasks = function(){
          var pendingpulls = [];
          pendingpulls.push(performPull(def.repo))
          return Promise.all(pendingpulls).finally(Traq.finally)
        }
      }
      if(elevatedpulltasks) return getTaskWithElevation( { elevatedpulltasks, regularpulltasks} )
      else return getTaskWithoutElevation({ regularpulltasks}) 
    }
    
    // console.log(`-------------------Processing pull for : ${def.repo} ${def.branch}`)
    console.dir(def)

    var env = Object.assign({}, process.env); // Shallow clone it.
    console.log('Running exlr pull : ' + path.dirname(__dirname))

    var useGitPull = processedArgs.useGitPull || false;

    if(def.elevated || def.repos) {
      if(def.elevated) def.requiresElevation = true;
      else delete def.requiresElevation;
    }
    else {
      if(def.requiresElevation) def.elevated = [def] 
      else def.repos = [def] 
    }

    
    var regularpulltasks = function(){ return Promise.resolve(true) }
    if(def.elevated){
      elevatedpulltasks = function() {
        return any(def.elevated.map((def) => performPull(def.repo))).then(() => {
          return true;
        }).catch((e) => {
          console.error(e) 
        })
      }
    }
    if(def.repos) {
      var regularpulltasks = function(){
        var pendingpulls = [];
        def.repos.forEach((def) => { pendingpulls.push(performPull(def.repo)) })
        return Promise.all(pendingpulls).finally(Traq.finally)
      }
    }
    if(elevatedpulltasks) return getTaskWithElevation( { elevatedpulltasks, regularpulltasks} )
    else return getTaskWithoutElevation({ regularpulltasks})
  }
}

function preworkerconfig(){
    // Everything runs after this check is completed. Elevation occurs out of process when needed.
    gitRepos = selectedinstance.repos
    // gitRepos = ['chess-server-lib'];
  
    // Repositiories that have symlinks that require elevated priviletes in windows to create symlinks
    elevatedRunasRepos = selectedinstance.elevated
    // Repos that should excluded from merge for releases...
    exludeMergeRepos = selectedinstance.exludeMergeRepos  

    // mysqldump --add-drop-table --no-data -u root -p db_name | grep 'DROP TABLE' ) > drop_all_tables.sql
    // mysql -u root -p db_name < drop_all_tables.sql

    var mysql = '../xampp/mysql/bin/mysql'
    var mysqldump = '../xampp/mysql/bin/mysqldump'
}


// The main elxr cli process
function elxrworker() {
  var subcommandlabels = {
    remote : (`remote ${processedArgs._[1] || ''}`).trim()
  }

  var __runcmd = function (label) {
    var distinquishedlabel = subcommandlabels[label] || label
    return op[distinquishedlabel] ? op[distinquishedlabel](processedArgs) : null;
  }


  // --runas
  if (processedArgs.runas) {
    // Weve been asked to run in priviledged mode. Check if we already are privileged.
    return __runcmd('runas')
  }
  else return __runcmd(processedArgs.label || processedArgs._[0] || 'h');
}

function acquireChoices(selectedinstance) {

  var hasconfig = false;
  console.warn(chalk.yellow(`
-------------------------------------------------------------------------------
Warning : Cannot locate your preferred configuration since it was not specified
You should fork the default chess configuration to customize and make it 
your own instance with a named config as 
  {{yourowninstancename}}-config-{{yourchosenenvironment}} 
And then run this tool as follows
  NODE_ENV={{yourchosenenvironment}} elxr i {{yourowninstancename}} 
OR
Run this tool with the following command to use a quick start default.
  elxr --default
OR
Choose one of the options below to run interactively.

We will run your choice at the next prompt.
-------------------------------------------------------------------------------
  `))
  var prompt = cli.prompter;
  return prompt.ask(`Choose an option :
      d) Install the default chess instance. 
          => elxr i chess node_env=development --default
      n) Create your custom new instance interactively
          => elxr i {{instanceName}} node_env={{environment}}
      i) Choose an instance and environment to install
          => elxr i {{instanceName}} node_env={{environment}}
      c) Choose a command to run ( pull, use, i, npmi ... ) <= pull
          => elxr {{cmd}} {{instanceName}} node_env={{environment}}
      h) Help
      q) Quit
        Default <= d
    : `).then((choice) => {
    if (choice && choice === 'd' || !choice) {
      processedArgs._[0] = 'i'
      selectedinstance.instanceName = processedArgs._[1] = processedArgs._[1] || 'chess'
      selectedinstance.node_env = processedArgs.node_env = (process.env.NODE_ENV && process.env.NODE_ENV.trim()) || processedArgs.node_env || 'development'
      selectedinstance.reposerver = 'https://git.bbh.org.in'
    }
    else if (choice === 'h') {
      processedArgs._[0] = 'h'
      fs.writeFileSync('run.done', 'noop help');
      console.log(elxr.help()); process.exit()
    }
    else if (choice === 'n' || choice === 'i') {
      var p1 = cli.prompter;
      return p1.ask(`Enter Instance Name ( <= ${selectedinstance.instanceName} ) : `).then(function (instanceName) {
        processedArgs._[0] = 'i'
        selectedinstance.instanceName = processedArgs._[1] = instanceName || selectedinstance.instanceName;
        return p1.ask(`Enter Environment ( <= ${selectedinstance.node_env} ) : `).then(function (node_env) {
          selectedinstance.node_env = processedArgs.node_env = node_env || selectedinstance.node_env
          if (choice === 'n') {
            selectedinstance.reposerver = 'https://git.bbh.org.in'
            console.warn(
              chalk.magenta('No Option Available. Your account may not have privileges. You can request here http://git.bbh.org.in/chess'))
            process.exit();
          }

          return p1.ask(`Enter preferred repo server ( <= ${selectedinstance.reposerver || selectedinstance.reposervers[0]} ) : `).then(function (reposerver) {
            selectedinstance.reposerver = reposerver || selectedinstance.reposervers[0] || 'https://git.bbh.org.in'
          })
        })
      })
    } else if (choice === 'c') {
      var p1 = cli.prompter;
      return p1.ask(`Enter Instance Name ( <= ${selectedinstance.instanceName} ) : `).then(function (instanceName) {
        selectedinstance.instanceName = processedArgs._[1] = instanceName || selectedinstance.instanceName
        return p1.ask(`Enter Environment ( <= ${selectedinstance.node_env} ) : `).then(function (node_env) {
          selectedinstance.node_env = processedArgs.node_env = node_env || selectedinstance.node_env
          return p1.ask(`Enter cmd : 
      p) pull
        Default <= p
      : `).then(function (cmd) {
            if (!cmd || cmd === 'p') {
              processedArgs._[0] = 'pull'
            }
            else processedArgs._[0] = cmd
            return p1.ask(`Enter preferred repo server ( <= ${selectedinstance.reposerver || selectedinstance.reposervers[0]} ) : `).then(function (reposerver) {
              selectedinstance.reposerver = reposerver || selectedinstance.reposervers[0] || 'https://git.bbh.org.in'
            })
          })
        })
      })
    } else {
      console.log(chalk.gray(`Default option not exercised. Please follow manual instructions to customize your instance here http://git.bbh.org.in/chess and try again.`));
      fs.writeFileSync('run.log', ', ' + JSON.stringify({ success: 'quit without execution' }), { 'flag': 'a+' })
      fs.writeFileSync('run.done', 'noop quit');
      process.exit()
    }
  })
}

var mergeObjByKey = function(arrOfObjs, keyName) {

  var keyedDistinct = {}
  var distinctArrOfObjs = [] 

  arrOfObjs.forEach( o => {
    if(o) (keyedDistinct[o[keyName]] || (keyedDistinct[o[keyName]] = []) ).push(o) 
  })
  Object.keys(keyedDistinct).forEach(key => {
    distinctArrOfObjs.push(  utils.assign( ...keyedDistinct[key] ) ) // PB : TODO -- Shallow use utils.assign
  })

  return distinctArrOfObjs;
}

var cacheWriteInstanceConfig = function(chessinstances){
  var instanceName = chessinstances['current_run'].instanceName;
  var node_env = chessinstances['current_run'].node_env;
  chessinstances[instanceName][node_env].repos = mergeObjByKey(chessinstances[instanceName][node_env].repos, 'repo') ;
  chessinstances[instanceName][node_env].elevated = mergeObjByKey(chessinstances[instanceName][node_env].elevated, 'repo') ;
  fs.writeFileSync(instanceroot + '/chessinstances.js', 'module.exports = ' + JSON.stringify(chessinstances, null, 2) + '', { 'flag': 'w' })
}

var acquireConfig = function (selected) {

  var configrepo = selected.instanceName + '-config-' + selected.node_env;

  return performPull(configrepo).then(() => {
    var manifestpath = path.normalize(selected.root + '/' + selected.instanceName + '-config-' + selected.node_env + '/repo-manifest');
    selectedinstance = require(manifestpath)()
    // Config from server always override merges into selection ecept for the current selection.
    // PB : TODO -- utils.assign Array merges are non-distinct...
    if(!selectedinstance.repos[0].repo) {
      console.warn('repo manifest has obsolete format. Attempting upgrade.')
      selectedinstance.repos = selectedinstance.repos.map(function(repo){ return { repo } })
    }
    if(selectedinstance.elevated[0] && !selectedinstance.elevated[0].repo) {
      console.warn('elevated repo manifest has obsolete format. Attempting upgrade.')
      selectedinstance.elevated = selectedinstance.elevated.map(function(repo){ return { repo } })
    }
    chessinstances[selected.instanceName][selected.node_env] = selectedinstance = utils.assign(selected, selectedinstance)
    chessinstances[selected.instanceName][selected.node_env].reposervers = Array.from(new Set(chessinstances[selected.instanceName][selected.node_env].reposervers))
    selectedinstance.reposerver = selectedinstance.reposerver || selectedinstance.reposervers[0] // PB : TODO -- Attempt first one that is available and online...
    cacheWriteInstanceConfig(chessinstances)
    ENV.NODE_ENV = selectedinstance.node_env;
  })
  .catch((e) => {
    console.error(e)
    console.error('Config acquisition failed.')
  })
}

var launchpath = process.cwd().replace(/\\/, '/')
var thisscriptdir = __dirname; // PB : TODO -- Thisscriptdir could be dislocated when run as a standalone file... We need to detect this where and how we were run.
// The easisest would be to ask for a target directory and default to current dir.... 
var instanceroot = path.normalize(thisscriptdir) === path.normalize(launchpath) ? thisscriptdir + '/..' : launchpath ;

var __default = {

  // Default is public server only.
  // All public repos are by default available.
    reposervers: ['https://git.bbh.org.in']
  , repos: [
      { repo : 'setup' }
    , { repo : 'elxr' }
    , { repo : 'loopback-connector-mysql' }
    , { repo : 'loopback-jsonapi-model-serializer' }
    , { repo : 'loopback-component-jsonapi' }
    , { repo : 'ember-service-worker' }
    , { repo : 'ember-service-worker-asset-cache' }
    , { repo : 'ember-service-worker-cache-fallback' }
    , { repo : 'ember-service-worker-index' }
    , { repo : 'ember-sw-client-route' }
  ]

  , elevated: []
  , exludeMergeRepos: {}
  , instanceName: 'chess'
  // Runas windowshta clobbers and removes the NODE_ENV !!! We therefore pass it in.
  , node_env: 'development'
}

var detectInstance = function () {
  console.log(`launchpath = ${launchpath}`)
  console.log(`thisscriptdir = ${thisscriptdir}`)
  console.log(`instanceroot = ${instanceroot}`)

  var root = instanceroot;

  // We need a reference to the root director for elxr cli to be properly oriented.
  if ((launchpath + path.normalize('/elxr')) === thisscriptdir) {
    // We ran from the proper root with elxr subfolder. 
    // PB : TODO --- Additional checks required to verify elxr is the right folder 
      // should be a git repo. has elxr signature
      // and .elxr folder signature... in the launchpath.
    console.log(`Instance Path : ${root}`)
    instanceroot = root = launchpath 
  }
  else {
    if (launchpath === thisscriptdir) {
      // Same directory doesn't mean we are being run from elxr directory or the root directory. 
      // It could be a standalone elxr build which may or maynot be in the proper location.
      if (BUILD_VERSION.indexOf('Version: {version} - built on {date}') > -1) {
        // Unbuilt therefore we are in the elxr directory.
        instanceroot = root = path.normalize(launchpath + '/..');
      }
      else {
        // Built version.
        // check if we have a elxr subfolder.
        if (fs.existsSync(launchpath + '/..' + path.normalize('/elxr'))) {
          // Probably in the right place.        
          instanceroot = root = path.normalize(launchpath + '/..');
        }
        else {
          // Assume launchpath is meaningless.
          // Figure it out from the input instance name and environment parameters if we are in the right location.
          instanceroot = root = path.normalize(launchpath + '/' + processedArgs._[1] + '/' + processedArgs.node_env)
        }
      }
    }
  }
  instanceroot = root.replace(/\\/g, '/');
  __default.root = root;
  clioverrides.root = clioverrides.root || root; 

  // Resolves undefined when No known instances detected.
  return Promise.resolve( 
    // We can expect a .elxr at each level.
    ['' /* instanceroot */, '../' /* instanceTypes or node_env */, '../..' /* instanceNames */].earlyreduce( ( acc, p, i, a )=>{
      var root = `${instanceroot}/${p}.elxr`;
      if(existsSync( root )) {
        try {
          var chessinstances = acquirelocalinstances( { root } )
          return Object.keys(chessinstances).earlyreduce( ( acc, instanceName) => {
                return Object.keys(chessinstances[instanceName]).earlyreduce( (acc, instanceType) => {
                    if(  path.normalize(chessinstances[instanceName][instanceType].root) === path.normalize(root) ) return {
                      value : chessinstances[instanceName][instanceType]
                      , done : true
                    };s
                  })
              })
        }
        catch(e){ 
          return {}
        }
      }
      else return {}
    }).value
  )
}

var __interactve_promts = {
    get reposerver(){
    return cli.prompt(this.reposervers, 'git default repo').then(reposerver => {
      Object.defineProperty(this, 'reposerver', {
        value: reposerver,
        writable: false,
        configurable : true,
        enumerable : true
      });
      return reposerver
    })
  }
  , set reposerver(reposerver){
    Object.defineProperty(this, 'reposerver', {
      value: reposerver,
      writable: false,
      configurable : true,
      enumerable : true
    });
    return reposerver
  }
}

var downloadsdir = '../Downloads';
var prerequisites = [
  {
    shellcmd: 'git',
    url: 'https://github.com/git-for-windows/git/releases/download/v2.31.0.windows.1/Git-2.31.0-64-bit.exe'
    , installer: 'Git-2.31.0-64-bit.exe'
    , installcmd: ['cmd', ['/c', 'start',
      '/WAIT', path.resolve(downloadsdir + '/' + 'Git-2.31.0-64-bit.exe')
      , '/VERYSILENT'
      // , '/MERGETASKS=!runcode' // This is required only for vscode...
    ]]
    , preinstallsteps: function() {
      var prompt = cli.prompter;
      var steps = [
        () => {
          if (!existsSync(downloadsdir + '/' + this.installer)) {
            return nodeShellExec(`${selectedinstance.root}/.elxr/run-${runtimestamp}/download.bat`, [this.url, downloadsdir + '/' + this.installer])
          }
          else return Promise.resolve(true)
        }
      ]
      var prompts = [
          () => prompt.ask(`git user name : ( <= ${gitUser} )`).then((user) => { gitUser = user; })
        , () => prompt.ask(`git email : ( <= ${gitEmail} )`).then((email) => { gitEmail = email; })
      ]
      return any([any(steps), any(prompts)])
    }
    , installsteps: function () {
      return any([this.installcmd].map(callsheltask))
    }
    , postinstallsteps: function(){
      
      var prompt = cli.prompter;
      
      var gitUser = 'guest';
      var gitEmail = 'guest@bbh.org.in';
      var prompts = [];
      prompts.push(
        ()=>{
          var choices = { 0 : 'guest', 1 : 'chessdemo' }
          return cli.prompt(choices, 'git user name').then(gituser => gitUser = gituser)
        }
      )

      prompts.push(
        ()=>{
          var choices = { 0 : 'guest@bbh.org.in', 1 : 'chessdemo@bbh.org.in' }
          return cli.prompt(choices, 'git user email').then(gitemail => gitEmail = gitemail)
        }
      )

      return any(prompts).then(()=>{
        var steps = [
          ['git', ['config', '--global', '--add', 'user.name', `${gitUser}`]]
          , ['git', ['config', '--global', '--add', 'user.email', `${gitEmail}`]]
        ]
        return any(steps.map(callsheltask)).then(() => { 

        })
      });
    }
    , install: function () {
      return any([ /*this.preinstallsteps,*/ this.installsteps.bind(this), this.postinstallsteps.bind(this)])
    }
    , verifyAndInstall : function(){
      return getTaskCheckExists(this.shellcmd, { ignorefailures: true })().then((exists) => {
        if(exists) {
          // return any(['git', ['config', '--global', '-l']].map(callsheltask))
          return this.getUser(null, this.postinstallsteps.bind(this))
        }
        return this.install();
      });
    }
    , getUser : function(repo, onNoResult){
      
      
      onNoResult = onNoResult || function(){return false}
      var globalOrLocal = '--global';
      if(!repo) globalOrLocal = '--global';
      else globalOrLocal = '--local'

      return any([['git', ['config', globalOrLocal, '--get-all', 'user.name']]].map(callsheltask)).then((result)=>{
        // not yet configured.
        if(!result.success) return onNoResult()
        else {
          var users = result.messages[0].trim().split('\n');
          if(users.length === 0 ||
              users.length === 1 && users[0] === 'guest') {
            
            return onNoResult()
          }
          else return users[0]; // PB : TODO == We should probably prompt with all the users available for selection ! 
        }
      })
      .catch((e)=>{ 
        console.log(e) 
        return onNoResult()
      })
    }
  }
  ,
  {
    shellcmd: 'node',
    url: 'https://nodejs.org/dist/v14.16.0/node-v14.16.0-x64.msi'
    , installer: 'node-v14.16.0-x64.msi'
    , installcmd: ['MSIEXEC.exe', ['/i'
      , path.resolve(downloadsdir + '/' + 'node-v14.16.0-x64.msi')
      , 'ACCEPT=YES', '/passive']]
    , install : function() { return any([this.installcmd].map(callsheltask)).then(() => { }) }
  }
]

prerequisites.forEach(p=>{ prerequisites[p.shellcmd] = p })

function ensureDirectoryExistence(filePath) {
  var dirname = path.dirname(filePath);
  if (fs.existsSync(dirname)) {
    return filePath;
  }
  ensureDirectoryExistence(dirname);
  fs.mkdirSync(dirname);
  return filePath;
}

var mainTasks = [];
function verifyAndInstallPrerequisites() {
  fs.writeFileSync(ensureDirectoryExistence(path.normalize(`${selectedinstance.root}/${downloadsdir}/readme.txt`)), `${getVersion()} Your local downloads for this instance`)
  
  // PB : TODO include and build from files... using rollup..
  var downloadbatch =
    `::**************************************************************************
  :Download_ <url> <File>
    Powershell.exe ^
    $AllProtocols = [System.Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12'; ^
    [System.Net.ServicePointManager]::SecurityProtocol = $AllProtocols; ^
    (New-Object System.Net.WebClient).DownloadFile('%1','%2')
  exit /b
  ::**************************************************************************`
  fs.writeFileSync(`${selectedinstance.root}/.elxr/run-${runtimestamp}/download.bat`, downloadbatch)

  
  var windowselevate =
    `     
      <html><HTA:APPLICATION  ID="windowselevate" icon="#"/>
      <script language="vbscript">
        document.title = "elxr control panel"
        self.ResizeTo 200,600
        
        Sub Window_Onload
        self.MoveTo (screen.availWidth - (document.body.clientWidth + 40)),10
        End Sub

        Set objShell = CreateObject("WScript.Shell")
        Set objENV = objShell.Environment("Process")
        dim NODE_ENV 
        NODE_ENV = objENV("NODE_ENV")
      </script>

      <script language="javascript">
        //WINDOWSTATE="minimize" SHOWINTASKBAR="no" SYSMENU="no" CAPTION="no"
        // https://devblogs.microsoft.com/scripting/how-can-i-pass-command-line-variables-to-an-hta-when-it-starts/
        // alert(windowselevate.commandLine)
        var args = windowselevate.commandLine.split('"').slice(3);
        // alert(args)
        var processedArgs = { _ : [] }
        var namedArgs = [];
        for(var item in args){
          if(args[item].charAt(0) === '-'){ 
            namedArgs.push(args[item])
            var split = args[item].split('=');
            processedArgs[split[0].slice(2)] = split[1] || true;
          } 
          else processedArgs._.push(args[item]);
        }
        // args = args.forEach(function(item){ })
        // alert('processedArgs._ : ' + processedArgs._);
        // alert(processedArgs.runas);
        
        // PB : TODO -- Convert all the cli args back to string.
        var cargs = (processedArgs.debug ? '--inspect-brk=9228' : '') + ' elxr ' + processedArgs._.join(' ') + ' ' +  namedArgs.join(' ');
        // alert(cargs)
        var shell = new ActiveXObject('shell.application'); 
        // alert('launching node privilged. ' + processedArgs['nodepath']) 
        // shell.ShellExecute('where', 'node', '', '', 10);
        shell.ShellExecute('node', cargs, '', 'runas', 1);
        // shell.ShellExecute(processedArgs['nodepath'], cargs, '', 'runas', 1);
        var fso = new ActiveXObject('Scripting.FileSystemObject');
        
        window.onload = function() {
          document.body.style.backgroundColor = 'black';
          document.body.style.fontFamily = 'arial';
          var log = document.createElement('div');
          log.innerHTML='Please Wait';
          function l(msg){ log.innerHTML+= msg; };
          log.style.color = 'blue';
          log.style.width = '95%';
          log.id = 'log';
          document.body.appendChild(log);  
          
          l('<Br/>Current config : ')
          l('<Br/>NODE_ENV = ' + NODE_ENV)
          l('<Br/>cmd = ' + processedArgs._[0])
          processedArgs._[1] === 'use' ? l('<Br/>using = ' + processedArgs._[2]) : null;
          l('<Br/><Br/>')
          
          var timer = function(){
            l('.');
            if(fso.FileExists("run.done")) close();
            else window.setTimeout(timer, 1000);
          };
          window.setTimeout(timer, 3000);
        };
        
      </script>
      </html>
    
    `
  fs.writeFileSync(`${selectedinstance.root}/.elxr/run-${runtimestamp}/windowselevate.hta`, windowselevate)

  var downloadtasks = [];
  var installtasks = [];
  prerequisites.forEach(preq => {
    downloadtasks.push(getTaskCheckExists(preq.shellcmd, { ignorefailures: true })().then((exists) => {
      if (exists) console.log(`${preq.shellcmd} exists`)
      else {
        console.log(`${preq.shellcmd} is not installed`)
        return preq.preinstallsteps.call(preq).then(() => {
          installtasks.push(preq.install.bind(preq))
        })
      }
    }))
  })
  return Promise.all(downloadtasks).then(() => { return any(installtasks) })
}

var getPromptableAsyncPropDescriptor = function(propName, choices, defaultchoise){
  return {
    get (){
      return cli.prompt( choices, propName, defaultchoise).then(propValue => {
        Object.defineProperty(this, propName, {
          value: propValue,
          writable: false,
          configurable : true,
          enumerable : true
        });
        return propValue
      })
    }
    // , set (propValue){
    //   Object.defineProperty(this, propName, {
    //     value: propValue,
    //     writable: false,
    //     configurable : true,
    //     enumerable : true
    //   })
    //   return propValue;
    // }
    , configurable : true
    , enumerable : true
  }
}




function acquirelocalinstances(selected){
  var chessinstances = utils.assign(require(path.normalize(selected.root + '/chessinstances.js')));
  return chessinstances
}


// function updateselection(selected) { selectedinstance = utils.assign(selectedinstance, selected) }
var selectedinstance = null;
var chessinstances = { current_run : {} };
var promptkeys = { 
  // Try not to prompt anything unless absolutely necessary or reconfirm is forced.
  //   'instanceName' : true
  // , 'node_env' : true 
} 

function createChessInsance( cfg ){ 
  var inst = {};
  var __new = Object.assign({}, __default, cfg)
  inst[cfg.node_env] = __new; return inst; 
}

acquireElevationState().then(() => {
  var skipprerequisites = false;
  function initinstances(selected) {
    // PB : TODO -- processedArgs should already be part of selected.
    var instanceName = processedArgs._[1] 
      || chessinstances.current_run.instanceName 
      || selected.instanceName
      || clioverrides.instanceName;
      
    var node_env = processedArgs.node_env 
      || chessinstances.current_run.node_env 
      || selected.node_env
      || clioverrides.node_env;
    
    if(!instanceName) {
      promptkeys['instanceName'] = instanceName = chessinstances.current_run.instanceName = promptkeys['instanceName'] || __default.instanceName;
      promptkeys['node_env'] = node_env = chessinstances.current_run.node_env = promptkeys['node_env'] || __default.node_env;
      promptkeys['reposerver'] = promptkeys['reposerver'] || __default.reposervers[0];
    }
  
    if(!node_env) {
      promptkeys['node_env'] = node_env = chessinstances.current_run.node_env = promptkeys['node_env'] || __default.node_env;
      promptkeys['reposerver'] = promptkeys['reposerver'] || __default.reposervers[0];
    }

    chessinstances[instanceName] = chessinstances[instanceName] || createChessInsance( { 
      instanceName, node_env, root : selected.root, reposerver : promptkeys['reposerver'] } );
    chessinstances['current_run'] = { instanceName: instanceName, node_env: node_env }

    if(path.normalize(selected.root) !== path.normalize(chessinstances[instanceName][node_env].root)) {
      throw "Mismatched chessinstances config found " + chessinstances[instanceName][node_env].root + ' does not match ' + selected.root
    }
    // Override sequence.
    // __default, chessinstances[current_run], instanceName-config-development, cliargs, interactve_promts
    selectedinstance = utils.assign(
        selected
      , chessinstances[instanceName][node_env]
      , clioverrides
      // , __interactve_promts -- Cant just override. Also need selectedinstance to be ready...
    );

    // chessinstances[instanceName] = chessinstances[instanceName] || {}
    // chessinstances[instanceName][node_env] = chessinstances[instanceName][node_env] || {}
    
    // if(!selectedinstance.repos || selectedinstance.instanceName) {
    //   // Brand New.
    //   selectedinstance = Object.assign( __default, selectedinstance )
    // }
    
    if(!selectedinstance.repos[0].repo) {
      console.warn('repo manifest has obsolete format. Attempting upgrade.')
      selectedinstance.repos = selectedinstance.repos.map(function(repo){ return { repo } })
    }
    if(selectedinstance.elevated[0] && !selectedinstance.elevated[0].repo) {
      console.warn('elevated repo manifest has obsolete format. Attempting upgrade.')
      selectedinstance.elevated = selectedinstance.elevated.map(function(repo){ return { repo } })
    }
    
    // Config from server always override merges into selection except for the current selection.
    // PB : TODO -- utils.assign Array merges are non-distinct...
    chessinstances[instanceName][node_env] = selectedinstance = utils.assign(selected, selectedinstance)
    // chessinstances[selectedinstance.instanceName][selectedinstance.node_env] = selectedinstance;
    cacheWriteInstanceConfig(chessinstances)
    // PB : TODO -- We should probably write the new server config also...
    selectedinstance.reposerver = selectedinstance.reposerver || selectedinstance.reposervers[0] // PB : TODO -- Attempt first one that is available and online...

    return chessinstances
  }
  
  var noprerequisites = {
    add : true, 'set-url' : true, 'repo-relocate' : true
    , remote : true
  }
  var skipprereqs = {}
  var maintask = () => {
    
    // Default cmd to run !
    processedArgs._[0] === processedArgs._[0] || 'pull';  
    // selectedinstance.reposerver = selectedinstance.reposervers[0] // PB : TODO -- Attempt first one that is available and online from all that are available.
      
    if(!noprerequisites[processedArgs._[0]]
        && !skipprereqs[processedArgs._[0]]
      ) {
      return prerequisites.git.verifyAndInstall().then(()=>{
        var e = { message : 'verifyAndInstall', success : true}
        return acquireConfig(selectedinstance).catch((err) => {
          e = err;
          console.error('Chosen cofiguraton failed or not found. Fix config and rerun or chose another.')
          console.error(err)
        }).then(() => { preworkerconfig(); return elxrworker(true) })
        // .finally(()=>{
        //   fs.writeFileSync('run.log', ', ' + JSON.stringify({ error: e.message }), { 'flag': 'a+' })
        //   if(!e.success) fs.writeFileSync('run.done', 'error');
        //   // return process.exit()
        // })
      })
    }
    else {
      console.log('cmd has no preqs or has been configured to skip preqs')
      preworkerconfig()
      return elxrworker()
    }

  }

  const retaincount = 2
  var min = runtimestamp;
  var collect = []
  
  if(noprerequisites[processedArgs._[0]]
    || skipprereqs[processedArgs._[0]]
  ) {
    return elxrworker()
  }

  return detectInstance().then((detectedInstance)=>{
    
    selectedinstance = utils.assign(detectedInstance || {}, clioverrides)
    promptkeys = utils.assign(promptkeys, { 'instanceName' : clioverrides.instanceName, 'node_env' : clioverrides.node_env })
    
    if(clioverrides.reconfirm) {
      var reconfirm = { 'instanceName' : selectedinstance['instanceName'] === 'chess' }
    }
    else { var reconfirm = {}; }

    var prompts = [];
    var eachPrompt = function(k, i, a){
      
      // No local instances config found. We use a default initialized instance available in selectedinstance
      // Confirm those that were not supplied as user choices in runtime args and proceed to reattempt.
      // PB : TODO -- selectedinstance === __default check to prompt everything...
      if(  (promptkeys[k] !== undefined && promptkeys[k] !== null) && selectedinstance[k] !== promptkeys[k] 
        || (promptkeys[k] === undefined || promptkeys[k] === null) && (selectedinstance[k] === undefined || selectedinstance[k] === null) 
        || reconfirm[k]) {
        prompts.push(async ()=>{ 
          // PB : NOTE -- Important in async cases when this needs to be in the same state as when it was invoked.
            // We take a snapshot... Shallow.. !! If required deep should be used based on use case. 
            // If latest altered state is required we can reerence this directly.
          // var asyncthis = Object.assign(this); 
          Object.defineProperty(selectedinstance, k, getPromptableAsyncPropDescriptor(k, choices[k], promptkeys[k] || selectedinstance[k] ));
          return await selectedinstance[k] 
        })
      }
      delete promptkeys[k]
    }
    try {
      
      chessinstances = acquirelocalinstances(selectedinstance);
      initinstances(selectedinstance)
      
      var todo = Promise.resolve(true);
      var instanceNameChoices = new Set(Object.keys( chessinstances) )
      instanceNameChoices.delete('current_run')
      instanceNameChoices.add(selectedinstance['instanceName'])
      if(promptkeys['instanceName']) instanceNameChoices.add(promptkeys['instanceName'])
      
      var choices = {
          'instanceName' : Array.from(instanceNameChoices)
        , 'reposerver' : selectedinstance['reposervers']
      }
      
      Object.keys(__interactve_promts).forEach(eachPrompt, __interactve_promts)
      Object.keys(promptkeys).forEach(eachPrompt, promptkeys)
        
      todo = any(prompts).then(()=>{ return selectedinstance })
    }
    catch (e) {
      // PB : TODO -- verbose mode warning.. console.warn(e) // Missing chessinstances is not an error...
      initinstances(selectedinstance)
      
      var instanceNameChoices = new Set(Object.keys( chessinstances) )
      instanceNameChoices.delete('current_run')
      instanceNameChoices.add(selectedinstance['instanceName'])
      if(promptkeys['instanceName']) instanceNameChoices.add(promptkeys['instanceName'])
      
      var choices = {
          'instanceName' : Array.from(instanceNameChoices)
        , 'reposerver' : selectedinstance['reposervers']
        , 'instanceType' : ['development', 'production']
      }
      
      Object.keys(__interactve_promts).forEach(eachPrompt, __interactve_promts)
      Object.keys(promptkeys).forEach(eachPrompt, promptkeys)
        
      todo = any(prompts).then(()=>{ return selectedinstance })
      
      if(!processedArgs._[0] || !selectedinstance.node_env || !selectedinstance.instanceName){
        // Weve been told what to do.
        todo = todo.then(() => { return acquireChoices(selectedinstance) })
      }
  
      todo = todo.then(() => {
        try {
          chessinstances = acquirelocalinstances(selectedinstance)
          initinstances(selectedinstance)
        }
        catch (e) {
          console.error(e)
          console.log('No local instances config found in current root = ' + selectedinstance.root);
          console.log('A config will be createed with the instance and environment chosen...')
          // return (async ()=>{return await __default.reposerver})().then(()=>{
          //   // selectedinstance = Object.assign(detectedInstance, clioverrides);
          //   return selectedinstance = Object.assign(__default, selectedinstance);
          // })
          return selectedinstance
        }
      })
    }

    return todo
  })
  .then(()=>{

    if(!__isElevated) {
      ensureDirectoryExistence(`${selectedinstance.root}/.elxr/readme.txt`)
      // collect garbage
      return dirs( (dir)=>{
        var matches = /run-(.*)/gm.exec(dir.name)
        if(matches) {
          if(+(matches[1]) < min) {
            min = matches[1]
            collect.splice( 0, 0, matches[1] ) 
          }
          else collect.push(matches[1])
        }
  
      }, `${selectedinstance.root}/.elxr` ).then(()=>{
        // delete garbage
        if(collect.length > retaincount) {
  
          var asyncs = [];
          while((collect.length - asyncs.length) > retaincount) {
            asyncs.push(getShellTask('rm',['-rf', `run-${collect[asyncs.length]}`], { cwd : `${selectedinstance.root}/.elxr` })());
          }
          return Promise.all(asyncs)
        }
        else return true
      })
    }
    else return true;
  })
  .then(()=>{
    // PB : TODO -- Keep only the last n runs...
    // Currently it retains 2*n when proc needs to be relaunched in elevated mode !!!
    ensureDirectoryExistence(`${selectedinstance.root}/.elxr/run-${runtimestamp}/download.bat`)
    
    if (!skipprerequisites && !__isElevated || processedArgs.forceprereqs && !__isElevated ) mainTasks.push(verifyAndInstallPrerequisites);
    mainTasks.push(maintask)
    return any(mainTasks);
  })
})

// detect if alread installed -> Take no action.
// download if no installer avalable -> next()
// install 
function chackandinstall(items) {
  var tasks = []
  items.forEach(item => {
    tasks.push(getTaskCheckExists(item.shellcommand || prerequisites[item]))
  })

  return Promise.all(tasks).then(existances => {
    existances.forEach((exists, i) => {
      if (!exists) {
        return downloadandinstall([items[i]])
      }
    })
  })
}

function downloadandinstall(items) {
  var tasks = []
  items.forEach(item => {
    tasks.push(getTaskDownload(item))
  })
  return Promise.all(tasks)
}




// Sample instances config.
// var instances = {
//   "elixir": {
//     "production": {
//       "reposervers": ["http://git.bbh", "https://git.bbh.org.in"]
//       , "repos": ["ember-masonry-grid", "client", "elixir-client"]
//       , "exludeMergeRepos": {
//         "elixir-config-development": true, "elixir-config-test": true
//         , "elixir-config-production": true, "elixir-data": true
//       }
//       , "instanceName": "elixir", "node_env": "production"
//     }
//   }, 
//   "current_run": { "instanceName": "elixir", "node_env": "production" }
// }

// ,([^\}^\S\r]*?\}) // Regexp to eliminate extra comma at the end of an array or an object...