import Path from 'path'
import env from './Environment'
import os from 'os'
import fs from 'fs'



class NpmManager{


	static load(/* function */ progress){
		if(NpmManager.$init)
			return

		NpmManager.npm= env.getNpm(progress)
		NpmManager.$init= true
	}




	static install(/* object */ options, /* string */ name){
		var npm= NpmManager.npm
		var task= new core.VW.Task()
		var result={}
		var installed= result.installed=[]

		npm.load(options, (er)=>{
			if(er){
				task.exception= er
				return task.finish()
			}

			name= name?[name]:[]
			npm.commands.install(name, (er)=>{
				if(er){
					task.exception= er
					return task.finish()
				}

				task.result= result
				task.finish()

			})

			npm.registry.log.on("log", function(message){
				//vw.log(message)
				if(message && message.prefix=="finalize"){
					installed.push({
						path: message.message,
						module: Path.basename(message.message)
					})
				}
			})
		})

		return task
	}

}

export default NpmManager