var rollup = require('rollup');
var uglify = require('rollup-plugin-uglify');
var eslint = require('rollup-plugin-eslint');


function rollupTask(entry, dest) {
  var plugins = [
    eslint({
      exclude: [
        'src/static/styles/**',
        'src/static/libs/**',
        'src/static/scripts/libs/**'
      ]
    })
  ];

  if (argv.prod) {
    plugins.push(uglify());
  }
  return rollup.rollup({
    entry: entry,
    plugins: plugins
  })
  .then(function(bundle) {
    bundle.write({
      format: 'iife',
      moduleName: 'main',
      dest: dest
    });
  });
}

gulp.task('scripts', function(end) {
  fs.readdir(entry_script, function(err, items) {
    if (err) {
      end();
    }
    var i = 0;
    var l = items.length;
    var file = '';
    var name = '';

    for (; i<l; ++i) {
      name = items[i];
      file = path.join(entry_script, items[i]);
      if (test_script.test(file)) {
        rollupTask(file, path.join(dest_script, name));
      }
    }

    end();
  });
});

watch.onChanged = function(event) {
  if (event.type == 'changed' && test_script.test(event.path)) {
    rollupTask(event.path, event.path.replace(entry_script, dest_script));
  }
};