define([
  'summernote/core/agent',
  'summernote/core/list',
  'summernote/core/dom',
  'summernote/core/range',
  'summernote/defaults',
  'summernote/EventHandler',
  'summernote/Renderer'
], function (agent, list, dom, range,
             defaults, EventHandler, Renderer) {

  // jQuery namespace for summernote
  /**
   * @class $.summernote 
   * 
   * summernote attribute  
   * 
   * @mixin defaults
   * @singleton  
   * 
   */
  $.summernote = $.summernote || {};

  // extends default settings
  //  - $.summernote.version
  //  - $.summernote.options
  //  - $.summernote.lang
  $.extend($.summernote, defaults);

  var renderer = new Renderer();
  var eventHandler = new EventHandler();

  $.extend($.summernote, {
    /** @property {Renderer} */
    renderer: renderer,
    /** @property {EventHandler} */
    eventHandler: eventHandler,
    /** 
     * @property {Object} core 
     * @property {core.agent} core.agent 
     * @property {core.dom} core.dom
     * @property {core.range} core.range 
     */
    core: {
      agent: agent,
      list : list,
      dom: dom,
      range: range
    },
    /** 
     * @property {Object} 
     * pluginEvents event list for plugins
     * event has name and callback function.
     * 
     * ``` 
     * $.summernote.addPlugin({
     *     events : {
     *          'hello' : function(layoutInfo, value, $target) {
     *              console.log('event name is hello, value is ' + value );
     *          }
     *     }     
     * })
     * ```
     * 
     * * event name is data-event property.
     * * layoutInfo is a summernote layout information.
     * * value is data-value property.
     */
    pluginEvents: {},

    plugins : []
  });

  /**
   * @method addPlugin
   *
   * add Plugin in Summernote 
   * 
   * Summernote can make a own plugin.
   *
   * ### Define plugin
   * ```
   * // get template function  
   * var tmpl = $.summernote.renderer.getTemplate();
   * 
   * // add a button   
   * $.summernote.addPlugin({
   *     buttons : {
   *        // "hello"  is button's namespace.      
   *        "hello" : function(lang, options) {
   *            // make icon button by template function          
   *            return tmpl.iconButton(options.iconPrefix + 'header', {
   *                // callback function name when button clicked 
   *                event : 'hello',
   *                // set data-value property                 
   *                value : 'hello',                
   *                hide : true
   *            });           
   *        }
   *     
   *     }, 
   *     
   *     events : {
   *        "hello" : function(layoutInfo, value) {
   *            // here is event code 
   *        }
   *     }     
   * });
   * ``` 
   * ### Use a plugin in toolbar
   * 
   * ``` 
   *    $("#editor").summernote({
   *    ...
   *    toolbar : [
   *        // display hello plugin in toolbar     
   *        ['group', [ 'hello' ]]
   *    ]
   *    ...    
   *    });
   * ```
   *  
   *  
   * @param {Object} plugin
   * @param {Object} [plugin.buttons] define plugin button. for detail, see to Renderer.addButtonInfo
   * @param {Object} [plugin.dialogs] define plugin dialog. for detail, see to Renderer.addDialogInfo
   * @param {Object} [plugin.events] add event in $.summernote.pluginEvents 
   * @param {Object} [plugin.langs] update $.summernote.lang
   * @param {Object} [plugin.options] update $.summernote.options
   */
  $.summernote.addPlugin = function (plugin) {

    // save plugin list
    $.summernote.plugins.push(plugin);

    if (plugin.buttons) {
      $.each(plugin.buttons, function (name, button) {
        renderer.addButtonInfo(name, button);
      });
    }

    if (plugin.dialogs) {
      $.each(plugin.dialogs, function (name, dialog) {
        renderer.addDialogInfo(name, dialog);
      });
    }

    if (plugin.events) {
      $.each(plugin.events, function (name, event) {
        $.summernote.pluginEvents[name] = event;
      });
    }

    if (plugin.langs) {
      $.each(plugin.langs, function (locale, lang) {
        if ($.summernote.lang[locale]) {
          $.extend($.summernote.lang[locale], lang);
        }
      });
    }

    if (plugin.options) {
      $.extend($.summernote.options, plugin.options);
    }
  };

  /*
   * extend $.fn
   */
  $.fn.extend({
    /**
     * @method
     * Initialize summernote
     *  - create editor layout and attach Mouse and keyboard events.
     * 
     * ```
     * $("#summernote").summernote( { options ..} );
     * ```
     *   
     * @member $.fn
     * @param {Object|String} options reference to $.summernote.options
     * @return {this}
     */
    summernote: function () {
      // check first argument's type
      //  - {String}: External API call {{module}}.{{method}}
      //  - {Object}: init options
      var type = $.type(list.head(arguments));
      var isExternalAPICalled = type === 'string';
      var hasInitOptions = type === 'object';

      // extend default options with custom user options
      var options = hasInitOptions ? list.head(arguments) : {};

      options = $.extend({}, $.summernote.options, options);
      options.icons = $.extend({}, $.summernote.options.icons, options.icons);

      // Include langInfo in options for later use, e.g. for image drag-n-drop
      // Setup language info with en-US as default
      options.langInfo = $.extend(true, {}, $.summernote.lang['en-US'], $.summernote.lang[options.lang]);

      // override plugin options
      if (!isExternalAPICalled && hasInitOptions) {
        for (var i = 0, len = $.summernote.plugins.length; i < len; i++) {
          var plugin = $.summernote.plugins[i];

          if (options.plugin[plugin.name]) {
            $.summernote.plugins[i] = $.extend(true, plugin, options.plugin[plugin.name]);
          }
        }
      }

      this.each(function (idx, holder) {
        var $holder = $(holder);

        // if layout isn't created yet, createLayout and attach events
        if (!renderer.hasNoteEditor($holder)) {
          renderer.createLayout($holder, options);

          var layoutInfo = renderer.layoutInfoFromHolder($holder);
          $holder.data('layoutInfo', layoutInfo);

          eventHandler.attach(layoutInfo, options);
          eventHandler.attachCustomEvent(layoutInfo, options);
        }
      });

      var $first = this.first();
      if ($first.length) {
        var layoutInfo = renderer.layoutInfoFromHolder($first);

        // external API
        if (isExternalAPICalled) {
          var moduleAndMethod = list.head(list.from(arguments));
          var args = list.tail(list.from(arguments));

          // TODO now external API only works for editor
          var params = [moduleAndMethod, layoutInfo.editable()].concat(args);
          return eventHandler.invoke.apply(eventHandler, params);
        } else if (options.focus) {
          // focus on first editable element for initialize editor
          layoutInfo.editable().focus();
        }
      }

      return this;
    },

    /**
     * @method 
     * 
     * get the HTML contents of note or set the HTML contents of note.
     *
     * * get contents 
     * ```
     * var content = $("#summernote").code();
     * ```
     * * set contents 
     *
     * ```
     * $("#summernote").code(html);
     * ```
     *
     * @member $.fn 
     * @param {String} [html] - HTML contents(optional, set)
     * @return {this|String} - context(set) or HTML contents of note(get).
     */
    code: function (html) {
      // get the HTML contents of note
      if (html === undefined) {
        var $holder = this.first();
        if (!$holder.length) {
          return;
        }

        var layoutInfo = renderer.layoutInfoFromHolder($holder);
        var $editable = layoutInfo && layoutInfo.editable();

        if ($editable && $editable.length) {
          var isCodeview = eventHandler.invoke('codeview.isActivated', layoutInfo);
          eventHandler.invoke('codeview.sync', layoutInfo);
          return isCodeview ? layoutInfo.codable().val() :
                              layoutInfo.editable().html();
        }
        return dom.value($holder);
      }

      // set the HTML contents of note
      this.each(function (i, holder) {
        var layoutInfo = renderer.layoutInfoFromHolder($(holder));
        var $editable = layoutInfo && layoutInfo.editable();
        if ($editable) {
          $editable.html(html);
        }
      });

      return this;
    },

    /**
     * @method
     * 
     * destroy Editor Layout and detach Key and Mouse Event
     *
     * @member $.fn
     * @return {this}
     */
    destroy: function () {
      this.each(function (idx, holder) {
        var $holder = $(holder);

        if (!renderer.hasNoteEditor($holder)) {
          return;
        }

        var info = renderer.layoutInfoFromHolder($holder);
        var options = info.editor().data('options');

        eventHandler.detach(info, options);
        renderer.removeLayout($holder, info, options);
      });

      return this;
    }
  });
});