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var cp = require('child_process'),
    _ = require('lodash'),
    path = require('path'),
    env = require('../lib/environment'),
    webpackConfig = require('./webpack.server')(env)

let server
let pending = true
const {output} = webpackConfig
const serverPath = path.join(output.path,output.filename)
const RUNNING_REGXP = /server is running at \d+/

function runServer(){
    return new Promise(function(resolve,reject){
        function onStdout(data){
            const time = new Date().toTimeString()
            const match = data.toString().match(RUNNING_REGXP)
            process.stdout.write(time.replace(/.*(\d{2}:\d{2}:\d{2}).*/,'[$1] '))
            process.stdout.write(data)
            if(match){
                server.host = match[1]
                server.stdout.removeListener('data',onStdout)
                server.stdout.on('data',x=>process.stdout.write(x))
                pending = false
                resolve(server)
            }
        }
        if(server){
            server.kill('SIGTERM')
        }
        server = cp.spawn('node',['./app.js'],{
            env:_.merge({},{NODE_ENV:'development'},process.env),
            slient:false
        })
        if(pending){
            server.once('exit',(code,signal)=>{
                if(pending){
                    throw new Error(`Server terminated unexpectedly with code: ${code} signal: ${signal}`)
                }
            })
        }
        server.stdout.on('data',onStdout)
        server.stderr.on('data',x=>process.stderr.write(x))

        return server
    })
}

process.on('exit',()=>{
    if(server){
        server.kill('SIGTERM')
    }
})

module.exports = runServer