var gulp = require ('gulp');
var gutil = require('gulp-util');
var wrap = require('gulp-wrap');
var concat = require ('gulp-concat');
var babel = require ('gulp-babel');
var fs = require ('fs');
var webpack = require ('webpack-stream');
var webpackConfig = require ('./webpack.config.js');

// Spliting

var splitingDir = './app/src/spliting';
var splitingFiles = splitingDir +'/*';

gulp.task ('spliting', function ()
{
	var jsonDeps = fs.readFileSync (splitingDir +'/deps.json');
	var modules = JSON.parse (jsonDeps);

	var importTpl = fs.readFileSync (splitingDir +'/import.tpl.js', 'utf8');
	var requireTpl = fs.readFileSync (splitingDir +'/require.tpl.js', 'utf8');

	for (var modName in modules)
	{
		var deps = modules[modName];
		var splitFile = './'+ modName +'/src/spliting.js';
		
		try {
			fs.unlinkSync (splitFile);
		}
		catch (e) {}
		
		fs.appendFileSync (splitFile, importTpl);
		
		var i = deps.length;
		while (i--)
			fs.appendFileSync (splitFile,
				requireTpl.replace (/\$module/g, deps[i]));
	}
});

// Webpack

gulp.task ('webpack', ['spliting'], function (callback)
{
	return gulp.src (['app/index.js', 'login/index.js'])
		.pipe (webpack (webpackConfig))
		.pipe (gulp.dest ('build/public/'));
});

// Routes

var routeFiles = './crud/**/routes.js';

gulp.task ('routes', function ()
{
	var fileTpl = '\n"<%=file.relative%>": <%=contents%>';
	var globalTpl = 'var routes = {<%=contents%>\n}';

	return gulp.src (routeFiles)
		.pipe (wrap (fileTpl))
		.pipe (concat ('salix.routes.js', {newLine: ','}))
		.pipe (wrap (globalTpl))
		.pipe (babel ({presets: ['es2015']}))
		.pipe (gulp.dest ('./build/public'));
});

// Watch

gulp.task ('watch', function ()
{
	gulp.watch (routeFiles, ['routes']);
	gulp.watch (splitingFiles, ['spliting']);
});

// Default

gulp.task ('build', ['routes', 'webpack']);
gulp.task ('default', ['watch', 'build']);