const gulp = require('gulp');
const sass = require('gulp-sass')(require('sass'));
const coffee = require('gulp-coffee');
const sourcemaps = require('gulp-sourcemaps');
const plumber = require('gulp-plumber');

// Compile .sass files to compressed CSS
function compileSass() {
  return gulp.src('assets/styles/**/*.sass')
    .pipe(plumber())
    .pipe(sass({ outputStyle: 'compressed' }).on('error', sass.logError))
    .pipe(gulp.dest('public/css'));
}

// Compile .coffee files to JavaScript with source maps
function compileCoffee() {
  return gulp.src('assets/scripts/*.coffee', { sourcemaps: true })
    .pipe(plumber())
    .pipe(coffee({ bare: true }))
    .pipe(gulp.dest('public/js', { sourcemaps: '.' }));
}

// Watch files for changes
function watchFiles() {
  gulp.watch('assets/styles/**/*.sass', compileSass);
  gulp.watch('assets/scripts/**/*.coffee', compileCoffee);
}

// Define default task
exports.default = gulp.series(
  gulp.parallel(compileSass, compileCoffee),
  watchFiles
);

// one-time build
exports.build = gulp.parallel(compileSass, compileCoffee);

// start builds with file watching
exports.watch = watchFiles;