const { any } = require('bbhverse');
const fs = require('fs')

var cli = require('./cliverse')
var nodeShellExec = cli.nodeShellExec;

// PB : TODO -- linux prerequistes.
// export GIT_SSL_NO_VERIFY=true
// npm i -g nodemon

// phantomjs": "^2.1.7
// "sass": "^1.32.7",
//     "node-sass": "^5.0.0",
//     "ember-cli-sass": "^10.0.1",
//     "gulp-sass": "^4.1.0",

// ember-searchable-select
  // ember-cli-sass
  
// ember-cp-validatations
  // ember-cli-yuidoc
  // yuidoc-ember-theme

// chess-server-lib/server
// java

// client
// export NODE_OPTIONS=--openssl-legacy-provider

// elixir-client npmi 
// elixir-client/chess-client-lib npmi 
  // crossfilter2

var __isElevated = null;
var shell_verse = {
  // getCommonTask is agnostic of whether we are running in an elevated shell or not. It runs in either case.
    getCommonTask( taskToRun ){ return ()=>{ return shell_verse.runTask(taskToRun) }}
  , runTask : ( taskToRun ) => {
    if (__isElevated)  return shell_verse.runElevated( taskToRun )
    else return shell_verse.runNonElevated( taskToRun )
  }

  , elevatedRunner( taskToRun ){
    // PB : TODO -- Should be called only when we are in an elevated shell that was already requested from an unelevated shell with a batch of tasks.
    try {
      // PB : We do not need IPC in linux. Until a real sudo elevation is required eveything works in non elevated mode...
      var __runasresult = null;
      return taskToRun().then((r)=>{ 
          // PB : TODO -- Every elevation should have its own messaging file. Async writes from multiple processes are a problem here...
          // fs.writeFileSync('run.log', ', ' + JSON.stringify( { info : taskToRun.info, success: true }), { 'flag': 'a+' })
          // fs.writeFileSync('run.done', 'success')  // PB : TODO -- This should be done conditionally if we are running inproc.
          return __runasresult = r;
        })
        .catch((e) => {
          // fs.writeFileSync('run.log', ', ' + JSON.stringify(e), { 'flag': 'a+' })
          // fs.writeFileSync('run.done', 'failure')
          console.error(e)
        })
        .finally(() => {
          // if(__runasresult && !__runasresult.skipped) fs.unlinkSync('run.done')
        })
    }
    catch (e) {
      console.error('Error Invalid command : ' + e)
      // fs.writeFileSync('run.done', 'error')
    }
    finally {
    }
  }
  , getElevatedTask : function( taskToRun ){ return ()=>{ return shell_verse.runElevated(taskToRun) }}
  , runElevated : ( taskToRun ) => {
    // Let shell_verse decide whether to Elevate Out of Proc or In Proc
    
    // taskToRun by default is the launched command and args. Specially in windows out of proc.
    // taskToRun = taskToRun || (()=>{ return op[processedArgs.label || processedArgs._[0] || 'undefined'](processedArgs) }) 

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


    if (__isElevated) {
      return shell_verse.elevatedRunner(taskToRun)
    }
    else {
      console.log('Requesting Elevated Privileges');
      // requesteElevation is acutally request elevation and run. Both In Proc and Out of Proc.
      // Linux doesnt require elevation for most commands...
      return shell_verse.requestElevation(shell_verse.elevatedRunner, taskToRun)
    }
  }
  , runElevatedBatch( batchToRun ){
    // In windows we don't need to run each task. We hand over to another shell which in elevated state rebuilds the whole batch and runs.
    // Irrespective of the batch we just call runElevated once.
    return any(batchToRun.map( t => shell_verse.runElevated  ))
  }

  , getNonElevatedTask : function( taskToRun ){ return ()=>{ return shell_verse.runNonElevated(taskToRun) } }
  , runNonElevated : ( taskToRun ) => {
    // Let shell_verse decide whether to Elevate Out of Proc or In Proc
    if(__isElevated) {
      return Promise.resolve( 'Skipping regular task in elevated shell.' ) // Regular tasks unless marked as common tasks should not run in elevated shell...
    }
    else {
      // taskToRun by default is the launched command and args.
      // taskToRun = taskToRun || (()=>{ return op[processedArgs.label || processedArgs._[0] || 'undefined'](processedArgs) }) 

      return taskToRun().then(r=>{
        taskToRun.statuslog.statuslog(null, taskToRun.info /*repo*/ )
        return r;
      }).catch((e) => {
        e.info = taskToRun.info;
        if(taskToRun.errHandler) throw taskToRun.errHandler(e)
        taskToRun.statuslog.statuslog(e); 
        // console.error(e)
        throw e;
      }).finally(()=>{})
    }
  }
  
  , isElevated : ()=>{
    return acquireElevationState().then( ()=>{
      shell_verse.isElevated = () => {
        return Promise.resolve(__isElevated)
      }
      return shell_verse.isElevated()
    })
  }
  
  // , isElevationOutOfProc : ()=>{ return true }

  , acquireElevationState : () => {
    return Promise.resolve(false).then(( elevationstate ) => {
      __isElevated ? console.log('Elevated') : console.log('Not Elevated')
      __isElevated = elevationstate;
    }).catch(() => {
      __isElevated = false;
      console.log('Not Elevated');
    }).finally(()=>{
      shell_verse.acquireElevationState = ()=> Promise.resolve(__isElevated); 
      shell_verse.isElevated = () => { return Promise.resolve(__isElevated)}
      return __isElevated;
    })
  }

  , getTaskCheckExists : cli.createTask('getTaskCheckExists', 'which')

  , getbash : ()=>{ return "sh" }

  , createJuntionOrLink : (dirOrFile, target, opts)=>{
    return nodeShellExec('ln', ['-s', target, dirOrFile], opts).catch((e) => { console.error(e) })
  }

  , removeJuncionOrLink : ( junctionOrLink )=>{
    return nodeShellExec('rm', [junctionOrLink], { inherit: true, shell: true, env: process.env })
  }

  , requestElevation(elevatedRunner, taskToRun) {
      // PB : TODO -- Most linking cmds in linux may not need elevation like in windows.
        // However returning true here is pseudo and will break cases where real elevation is required in linux. We need to refactor to reimplement
        // this with sudo and change all calles to use ony where required.   
      return elevatedRunner(taskToRun); 
  }
}

module.exports = shell_verse