var versionFrom = process.argv[2];

if (process.argv.length < 3) {
	throw new Error("No 'version from' passed");
}

var acceptedVersionName = process.argv[3] || versionFrom;

var path = require('path');
var fs = require('fs');
var sys = require('sys')

var version = (require('./package.json') || {}).version;

var currentPath = path.dirname(fs.realpathSync(__filename));

var buildRelPath = 'build/EspoCRM-' + version;
var buildPath = currentPath + '/' + buildRelPath;
var diffFilePath = currentPath + '/build/diff';

var upgradePath = currentPath + '/build/EspoCRM-upgrade-' + acceptedVersionName + '-to-' + version;


var exec = require('child_process').exec;

function execute(command, callback) {
	exec(command, function(error, stdout, stderr) {
    	callback(stdout);
    });
};

execute('git diff --name-only ' + versionFrom, function (stdout) {
	if (!fs.existsSync(upgradePath)) {
		fs.mkdirSync(upgradePath);
	}
	if (!fs.existsSync(upgradePath + '/files')) {
		fs.mkdirSync(upgradePath + '/files');
	}
	process.chdir(buildPath);
	
	var fileList = [];
	
	(stdout || '').split('\n').forEach(function (file) {
		if (file == '') {
			return;
		}
		fileList.push(file.replace('frontend/', ''));
	});
	
	fileList.push('client/espo.min.js');
	
	fileList.push('client/css/espo.min.css');
	
	fs.writeFileSync(diffFilePath, fileList.join('\n'));
	
	execute('git diff --name-only --diff-filter=D ' + versionFrom, function (stdout) {
		var deletedFileList = [];
		
		(stdout || '').split('\n').forEach(function (file) {
			if (file == '') {
				return;
			}
			deletedFileList.push(file.replace('frontend/', ''));
		});	
		
		
		execute('xargs -a ' + diffFilePath + ' cp --parents -t ' + upgradePath + '/files ' , function (stdout) {
	
		});
		
		var d = new Date();
		
		var monthN = ((d.getMonth() + 1).toString());
		monthN = monthN.length == 1 ? '0' + monthN : monthN;
		
		var dateN = d.getDate().toString();
		dateN = dateN.length == 1 ? '0' + dateN : dateN;
		
		var date = d.getFullYear().toString() + '-' + monthN + '-' + dateN.toString();
		
		execute('git tag', function (stdout) {			
			var versionList = [];
			var occured = false;
			tagList = stdout.split('\n').forEach(function (tag) {
				if (tag == versionFrom) {
					occured = true;
				}
				if (!tag || tag == version) {
					return;
				}
				if (occured) {
					versionList.push(tag);
				}
			});
		
			var manifest = {
				"name": "EspoCRM Upgrade "+acceptedVersionName+" to "+version,
				"version": version,
				"acceptableVersions": versionList,
				"releaseDate": date,
				"author": "EspoCRM",			
				"description": "",
				"delete": deletedFileList
			}
		
			fs.writeFileSync(upgradePath + '/manifest.json', JSON.stringify(manifest, null, '  '));
		
		});
		
		fs.unlinkSync(diffFilePath)
	
	});
	
});