var fs = require('fs');

var gulp = require('gulp');

var concat = require('gulp-concat');

var rename = require("gulp-rename");

var uglify = require('gulp-uglify');

var gutil = require('gulp-util');

var header = require('gulp-header');

var browserSync = require("browser-sync");

var pkg = require('./package.json');

/// Build the scripts

gulp.task('build', function() {

return gulp.src([

'src/parser.js',

'src/utils.js',

'src/texture.js',

'src/backend/GPUCore.js',

'src/gpu.js',

'src/backend/functionNode_webgl.js',

'src/backend/functionNode.js',

'src/backend/functionBuilder.js',

'src/backend/mode_cpu.js',

'src/backend/mode_gpu.js',

'src/wrapper/suffix.js'

])

.pipe(concat('gpu.js'))

.pipe(header(fs.readFileSync('src/wrapper/prefix.js', 'utf8'), { pkg : pkg } ))

.pipe(gulp.dest('bin'));

});

/// Minify the build script, after building it

gulp.task('minify', ['build'], function() {

return gulp.src(['bin/gpu.js'])

.pipe(rename('gpu.min.js'))

.pipe(uglify({

mangle: false,

preserveComments: "license"

}).on('error', gutil.log))

.pipe(gulp.dest('bin'));

});

/// The browser sync prototyping

gulp.task("bsync", ["minify"], function(){

// Detect change -> rebuild TS

gulp.watch(["src/**.js"], ["minify"]);

// Syncs browser

browserSync.init({

server: {

baseDir: "./"

},

open: true

});

});

/// Auto rebuild and host

gulp.task('default', ['bsync']);