#!/usr/bin/env node

var Hapi = require('hapi');
var exec = require('child_process').exec;
var fs = require('fs');

var routes = require('../src/routes.js');
var packageFile = require('../package.json');
var utils = require('../src/utils.js');

var server = new Hapi.Server();
var singleMode = false;

/**
 * Creates a Hapi server to process incoming requests, and writes the pid to the td.pid file.
 * @return {Object} The Hapi server.
 */
function boot()
{
	server.connection({port: process.env.TD_PORT || 5050});

	//add routes
	for (var i = 0 ; i < routes.length; i++) {
		server.route(routes[i]);
	}
	server.start(function () {
	    console.log('TestDoubles' + ' v' + packageFile.version + ' ready to roll at ' + server.info.uri + ' with logs at ' + __dirname + '/../logs/td.log');
	});

    fs.writeFileSync(__dirname + '/../td.pid', process.pid.toString());
}

/**
 * If the application is started regularly with the "start" command, then only the pid file is removed.
 * If the application is started with the "start-server" command, the process is killed. 
 */
function halt()
{
	if(!singleMode)
	{
		try
		{
			fs.statSync(__dirname + '/../td.pid');
			var pid = fs.readFileSync(__dirname + '/../td.pid');

		   	exec("kill " + pid, function (error, stdout, stderr) {

		        if (error) 
		        {
		            utils.logger.error(stderr);
		        }

		        console.log("TestDoubles has successfully shutdown");
		    });
		}

		catch(error)
		{
			console.log("TestDoubles server is not running ");
			process.exit(1);
		}
	}

	if(utils.checkFileExists(__dirname + '/../td.pid'))
	{
		fs.unlinkSync(__dirname + '/../td.pid');
	}

	process.exit(0);
}

/**
 * Exits the process.
 */
function terminate()
{
	if(utils.checkFileExists(__dirname + '/../td.pid'))
	{
		fs.unlinkSync(__dirname + '/../td.pid');
	}

	 console.log("TestDoubles has successfully shutdown");
	 process.exit(0);
}

/**
 * Displays documentation to the command line for the user to view.
 */
function help()
{
 	console.log();
	console.log();
 	console.log('Usage: tdctl [command] [options]');
    console.log('Commands: start, start-server, stop, help (defaults to start)');
    console.log('Options:');
    console.log('    --version         displays the TestDoubles version and exits');
    console.log();
    console.log('Description of commands ');
    console.log('    [start] Starts the TestDoubles server and Mountebank. If the command is omitted, server will be started automatically.');
    console.log('    [start-server] Starts only the TestDouble server.'); 
    console.log('    [stop]  Stops the TestDoubles server.');
    console.log('    [help]  Displays the documentation for TestDoubles.');
    console.log();
}

switch(process.argv[2]) 
{
	case 'start':
	case undefined:
		require('../node_modules/mountebank/bin/mb');
		boot();
		singleMode = true;
		break;

	case 'start-server':
		boot();
		break;	

	case 'stop':
		halt();
		break;

	case 'help':
		help();
		break;

	case '--version':
		console.log('TestDoubles ' + packageFile.version);
		break;

	default:
		help();
		break;
}

if(!singleMode)
{
	process.on('SIGTERM', terminate);
	process.on('SIGINT', terminate);
}

module.exports = server;