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

const del = require('del');

const { config, tasks } = require('../package.json');

const { makeTask } = require('./util.js');

/* Make sure each task has its key inserted. */

for (const key of Object.keys(tasks)) {

  tasks[key].key = key;

}

/*

 * Tasks loaded from package.json and converted into runnable task functions */

const taskFns = Object.keys(tasks).reduce((obj, key) => {

  obj[key] = makeTask(tasks[key]);

  return obj;

}, {});

/*

 * Array of tasks sorted by their `order` property for running in series.

 */

const orderedTasks =

  // Get all of the processors as an array

  Object.values(tasks)

    // Sort by the order value

    .sort((a, b) => (a.order < b.order ? -1 : 1))

    // Turn into processor tasks

    .flatMap(makeTask);

/*

 * Remove all files from the dist dir.

 */

function clean(done) {

  del.sync([config.distDir]);

  return done();

}

/*

 * Copy src files to the dist dir for processing. The tasks will cleanup unneeded files.

 */

function copyToDist() {

  return src([config.srcDir + '**/*.*', '!**/_*.*']).pipe(dest(config.distDir));

}

/*

 * $ npm run build

 * The default build task, running these tasks in series.

 */

const build = series(clean, copyToDist, ...orderedTasks);

module.exports = {

  default: build,

  build,

  /*

   * $ npm run serve

   * A watch task to run a local server with auto-refreshing when files are changed

   */

  serve: series(build, () => {

    const browserSync = require('browser-sync').create();

    function refresh(done) {

      browserSync.reload();

      done();

    }

    browserSync.init({

      server: config.distDir

    });

    watch([config.srcDir + '**/*.*'], series(build, refresh));

  }),

  ...taskFns

};

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