const { src, dest, series, parallel } = require('gulp');

const del = require('del');

const fs = require('fs');

const zip = require('gulp-zip');

const log = require('fancy-log');

const webpack_stream = require('webpack-stream');

const webpack_config = require('./webpack.config.js');

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

const paths = {

prod_build: 'prod-build',

server_file_name: 'server.bundle.js',

angular_src: 'my-app/dist/**/*',

angular_dist: 'prod-build/my-app/dist',

zipped_file_name: 'angular-nodejs.zip'

};

function clean() {

log('removing the old files in the directory')

return del('prod-build/**', {force:true});

}

function createProdBuildFolder() {

const dir = paths.prod_build;

log(`Creating the folder if not exist ${dir}`)

if(!fs.existsSync(dir)) {

fs.mkdirSync(dir);

log('📁 folder created:', dir);

}

return Promise.resolve('the value is ignored');

}

function buildAngularCodeTask(cb) {

log('building Angular code into the directory')

return exec('cd my-app && npm run build', function (err, stdout, stderr) {

log(stdout);

log(stderr);

cb(err);

})

}

function copyAngularCodeTask() {

log('copying Angular code into the directory')

return src(`${paths.angular_src}`)

.pipe(dest(`${paths.angular_dist}`));

}

function copyNodeJSCodeTask() {

log('building and copying server code into the directory')

return webpack_stream(webpack_config)

.pipe(dest(`${paths.prod_build}`))

}

function zippingTask() {

log('zipping the code ')

return src(`${paths.prod_build}/**`)

.pipe(zip(`${paths.zipped_file_name}`))

.pipe(dest(`${paths.prod_build}`))

}

exports.default = series(

clean,

createProdBuildFolder,

buildAngularCodeTask,

parallel(copyAngularCodeTask, copyNodeJSCodeTask),

zippingTask

);