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// Initialize modules
// Importing specific gulp API functions lets us write them below as series() instead of gulp.series()
const { src, dest, watch, series, parallel } = require('gulp');

// Importing all the Gulp-related packages we want to use
const sourcemaps = require('gulp-sourcemaps');
const sass = require('gulp-sass');
const concat = require('gulp-concat');
const uglify = require('gulp-uglify');
const babel = require('gulp-babel');
const plumber = require('gulp-plumber');
var replace = require('gulp-replace');


// File paths
const files = {
    scssPath: 'resources/assets/styles/**/*.scss',
    jsPath: 'resources/assets/scripts/**/*.js'
};

// Sass task: compiles the style.scss file into style.css
function scssTask(){
    return src(files.scssPath)
        .pipe(sourcemaps.init()) // initialize sourcemaps first
        .pipe(sass()) // compile SCSS to CSS
        .pipe(sourcemaps.write('.')) // write sourcemaps file in current directory
        .pipe(dest('dist/styles')); // put final CSS in dist folder
}

// JS task: concatenates and uglifies JS files to script.js
function jsTask(){
    return src('resources/assets/scripts/**/*.js')
        // Stop the process if an error is thrown.
        .pipe(plumber())
        // Transpile the JS code using Babel's preset-env.
        .pipe(babel({
            presets: [
                ['@babel/env', {
                    modules: false
                }]
            ]
        }))
        .pipe(concat('main.js'))
        .pipe(uglify())
        // Save each component as a separate file in dist.
        .pipe(dest('./dist'))
}

// Watch task: watch SCSS and JS files for changes
// If any change, run scss and js tasks simultaneously
function watchTask(){
    watch([files.scssPath, files.jsPath],
        series(
            parallel(scssTask, jsTask),
        )
    );
}

// Export the default Gulp task so it can be run
// Runs the scss and js tasks simultaneously
exports.default = series(
    parallel(scssTask, jsTask),
    watchTask
);