/* TodoList()
 * =========
 * Converts a list into a todoList.
 *
 * @Usage: $('.my-list').todoList(options)
 *         or add [data-widget="todo-list"] to the ul element
 *         Pass any option as data-option="value"
 */
+function ($) {
  'use strict'

  var DataKey = 'lte.todolist'

  var Default = {
    onCheck  : function (item) {
      return item
    },
    onUnCheck: function (item) {
      return item
    }
  }

  var Selector = {
    data: '[data-widget="todo-list"]'
  }

  var ClassName = {
    done: 'done'
  }

  // TodoList Class Definition
  // =========================
  var TodoList = function (element, options) {
    this.element = element
    this.options = options

    this._setUpListeners()
  }

  TodoList.prototype.toggle = function (item) {
    item.parents(Selector.li).first().toggleClass(ClassName.done)
    if (!item.prop('checked')) {
      this.unCheck(item)
      return
    }

    this.check(item)
  }

  TodoList.prototype.check = function (item) {
    this.options.onCheck.call(item)
  }

  TodoList.prototype.unCheck = function (item) {
    this.options.onUnCheck.call(item)
  }

  // Private

  TodoList.prototype._setUpListeners = function () {
    var that = this
    $(this.element).on('change ifChanged', 'input:checkbox', function () {
      that.toggle($(this))
    })
  }

  // Plugin Definition
  // =================
  function Plugin(option) {
    return this.each(function () {
      var $this = $(this)
      var data  = $this.data(DataKey)

      if (!data) {
        var options = $.extend({}, Default, $this.data(), typeof option == 'object' && option)
        $this.data(DataKey, (data = new TodoList($this, options)))
      }

      if (typeof data == 'string') {
        if (typeof data[option] == 'undefined') {
          throw new Error('No method named ' + option)
        }
        data[option]()
      }
    })
  }

  var old = $.fn.todoList

  $.fn.todoList         = Plugin
  $.fn.todoList.Constructor = TodoList

  // No Conflict Mode
  // ================
  $.fn.todoList.noConflict = function () {
    $.fn.todoList = old
    return this
  }

  // TodoList Data API
  // =================
  $(window).on('load', function () {
    $(Selector.data).each(function () {
      Plugin.call($(this))
    })
  })

}(jQuery)
