var gulp = require ('gulp');
var wrap = require('gulp-wrap');
var concat = require ('gulp-concat');
var babel = require ('gulp-babel');
var fs = require ('fs');

// Routes

var fileTpl = '\n"<%=file.path%>": <%=contents%>';
var globalTpl = 'var routes = {<%=contents%>\n}';

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

// Spliting

var baseDir = './@salix/app/src/spliting';
var depsFile = baseDir +'/deps.json';

function splitingFunc ()
{
	try {
		var jsonDeps = fs.readFileSync (depsFile);
		var modules = JSON.parse (jsonDeps);
	}
	catch (e)
	{
		console.error (e);
		return;
	}
	
	var importTpl = fs.readFileSync (baseDir +'/import.tpl.js', 'utf8');
	var requireTpl = fs.readFileSync (baseDir +'/require.tpl.js', 'utf8');

	for (var modName in modules)
	{
		var deps = modules[modName];
		var splitFile = './@salix/'+ 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]));
	}
}

gulp.task ('spliting', function ()
{
	splitingFunc ();
	//gulp.watch (depsFile, splitingFunc);
});

// Default

gulp.task ('default', ['routes', 'spliting']);