declare var module: any;
declare function require(name:string);
declare var __filename: string;
declare var __dirname: string;

import base = require("./base");

var gulp = require('gulp');
var path = require('path');
var _ = require('lodash');
var $ = require('gulp-load-plugins')({ lazy: true });
var gutil = $.util;
var errorHandler = require('./helpers/errorHandler');
var logs = require('./helpers/logs');

class Watcher extends base.BaseTask {
  constructor() {
    super();
    return this;
  }

  static taskName:string = 'watcher';

  static config(task, tasks, userOptions) {
    return {};
  }

  static gulp(options, settings, task, tasks) {
    Watcher.checkArguments(options, settings, task, tasks);

    var browserSync = require('browser-sync');
    var reload = browserSync.reload;

    var taskListing = Watcher.storage;
    for (var taskKey in taskListing) {
      if(taskListing.hasOwnProperty(taskKey)) {
        (function(taskKey){
          var taskWatcher = taskListing[taskKey];
          logs(taskWatcher.dependencies.join(' | ') + ' watching ['+ taskWatcher.files.join(', ') + ']');

          var stream = gulp
            .watch(taskWatcher.files, taskWatcher.dependencies);

          if(browserSync.active) {
            stream.on('change', reload);
          }

          if(options && typeof(options.onAnyChange) === 'function') {
            stream.on('change', options.onAnyChange);
          }

          stream.on('error', gutil.log);
        })(taskKey);
      }
    }
  }
}

export = Watcher;