const gulp = require('gulp');
const fs = require('fs');
const util = require('gulp-util');
const merge = require('merge-stream');
const exec = require('child_process').exec;
const sass = require('gulp-sass');
const postcss = require('gulp-postcss');
const cssnano = require('cssnano');
const browserSync = require('browser-sync').create();
const concat = require('gulp-concat');
const imageResize = require('gulp-image-resize');

gulp.task('scripts:games', function (callback) {
  exec(`cd ./scripts/games/ && yarn install && node app.js`, function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    callback(err);
  });
});

gulp.task('scripts:wiki', function (callback) {
  exec(`cd ./scripts/wiki/ && yarn install && node app.js`, function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    callback(err);
  });
});

gulp.task('assets:images', function() {
  var baseImages = gulp.src(`build/images/*`, {base: './'})
      .pipe(gulp.dest('./'));
  var jumbotronImages = gulp.src(`build/images/jumbotron/*`, {base: './'})
      .pipe(imageResize({ width: 786, height: 471, crop: true }))
      .pipe(gulp.dest('./'));
  var bannerImages = gulp.src(`build/images/banners/*`, {base: './'})
      .pipe(imageResize({ width: 824, height: 306, crop: false }))
      .pipe(gulp.dest('./'));
  var boxartImages = gulp.src(`build/images/game/boxart/*`, {base: './'})
      .pipe(imageResize({ width: 328, height: 300, crop: true }))
      .pipe(gulp.dest('./'));
  var iconImages = gulp.src(`build/images/game/icons/*`, {base: './'})
      .pipe(imageResize({ width: 48, height: 48, crop: true }))
      .pipe(gulp.dest('./'));
  var screenshotImages = gulp.src(`build/images/screenshots/*`)
      .pipe(imageResize({ width: 400, height: 240, crop: false }))
      .pipe(gulp.dest(`build/images/screenshots/thumbs`));
  
  return merge(baseImages, jumbotronImages, bannerImages, boxartImages, iconImages, screenshotImages);
});

gulp.task('assets:js', function() {
  return gulp.src(['src/js/**/*.js'])
    .pipe(concat('script.js'))
    .pipe(gulp.dest('build/js'));
});

gulp.task('assets:fonts', function(){
  return gulp.src('./node_modules/bootstrap-sass/assets/fonts/**/*')
    .pipe(gulp.dest('build/fonts/'));
});

gulp.task('assets:scss', function () {
  var postCssOptions = [ cssnano ];
  return gulp.src('src/scss/style.scss')
    .pipe(sass().on('error', sass.logError))
    .pipe(postcss(postCssOptions))
    .pipe(gulp.dest('build/css'))
    .pipe(browserSync.stream());
});

gulp.task('hugo', function (cb) {
  exec('hugo -s ./site/ -d ../build/ -v', function (err, stdout, stderr) {
    console.log(stdout);
    console.log(stderr);
    cb(err);
  });
});

gulp.task('final:serve', function(done) {
    browserSync.init({
        open: false,
        server: {
            baseDir: 'build'
        }
    });

    gulp.watch('src/js/**/*', gulp.series('assets:js'));
    gulp.watch('src/scss/**/*', gulp.series('assets:scss'));
    gulp.watch('site/**/*.html', gulp.series('hugo'));
    gulp.watch('site/**/*.md', gulp.series('hugo'));

    gulp.watch('build/**/*').on('change', function(x) {
      browserSync.reload(x);
    });

    done();
});

gulp.task('final:publish', function(done) {
  fs.writeFileSync(`build/CNAME`, `${cname}`);
  fs.writeFileSync(`build/robots.txt`, `Sitemap: https://${cname}/sitemap.xml\n\nUser-agent: *`);
  done();
});

const cname = 'citra-emu.org';
var finalCommand = null;

if (util.env.production) {
  process.env.HUGO_ENV = 'PRD';
  process.env.HUGO_BASEURL = `https://${cname}`;
  finalCommand = 'final:publish';
} else {
  process.env.HUGO_ENV = 'DEV';
  process.env.HUGO_BASEURL = 'http://localhost:3000';
  finalCommand = 'final:serve';
}

util.log(`process.env.HUGO_ENV = '${process.env.HUGO_ENV}'`);
util.log(`process.env.HUGO_BASEURL = '${process.env.HUGO_BASEURL}'`);

gulp.task('default', gulp.series(gulp.parallel('assets:js', 'assets:fonts', 'assets:scss'), 'hugo', 'assets:images', finalCommand));
gulp.task('all', gulp.series(gulp.parallel('scripts:games', 'scripts:wiki'), gulp.parallel('assets:js', 'assets:fonts', 'assets:scss'), 'hugo', 'assets:images', finalCommand));
gulp.task('content', gulp.series('hugo', finalCommand));