# all files / src/js/base/ Context.js

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     import $ from 'jquery';
    import func from './core/func';
    import lists from './core/lists';
    import dom from './core/dom';

    export default class Context {
      /**
       * @param {jQuery} $note
       * @param {Object} options
       */
      constructor($note, options) {
        this.ui = $.summernote.ui;
        this.$note = $note;

        this.memos = {};
        this.modules = {};
        this.layoutInfo = {};
        this.options = options;

        this.initialize();
      }

      /**
       * create layout and initialize modules and other resources
       */
      initialize() {
        this.layoutInfo = this.ui.createLayout(this.$note, this.options);
        this._initialize();
        this.$note.hide();
        return this;
      }

      /**
       * destroy modules and other resources and remove layout
       */
      destroy() {
        this._destroy();
        this.$note.removeData('summernote');
        this.ui.removeLayout(this.$note, this.layoutInfo);
      }

      /**
       * destory modules and other resources and initialize it again
       */
      reset() {
        const disabled = this.isDisabled();
        this.code(dom.emptyPara);
        this._destroy();
        this._initialize();

        Eif (disabled) {
          this.disable();
        }
      }

      _initialize() {
        // add optional buttons
        const buttons = $.extend({}, this.options.buttons);
        Object.keys(buttons).forEach((key) => {
          this.memo('button.' + key, buttons[key]);
        });

        const modules = $.extend({}, this.options.modules, $.summernote.plugins || {});

        // add and initialize modules
        Object.keys(modules).forEach((key) => {
          this.module(key, modules[key], true);
        });

        Object.keys(this.modules).forEach((key) => {
          this.initializeModule(key);
        });
      }

      _destroy() {
        // destroy modules with reversed order
        Object.keys(this.modules).reverse().forEach((key) => {
          this.removeModule(key);
        });

        Object.keys(this.memos).forEach((key) => {
          this.removeMemo(key);
        });
        // trigger custom onDestroy callback
        this.triggerEvent('destroy', this);
      }

      code(html) {
        const isActivated = this.invoke('codeview.isActivated');

        if (html === undefined) {
          this.invoke('codeview.sync');
          return isActivated ? this.layoutInfo.codable.val() : this.layoutInfo.editable.html();
        } else {
          Iif (isActivated) {
            this.layoutInfo.codable.val(html);
          } else {
            this.layoutInfo.editable.html(html);
          }
          this.$note.val(html);
          this.triggerEvent('change', html);
        }
      }

      isDisabled() {
        return this.layoutInfo.editable.attr('contenteditable') === 'false';
      }

      enable() {
        this.layoutInfo.editable.attr('contenteditable', true);
        this.invoke('toolbar.activate', true);
        this.triggerEvent('disable', false);
      }

      disable() {
        // close codeview if codeview is opend
        Iif (this.invoke('codeview.isActivated')) {
          this.invoke('codeview.deactivate');
        }
        this.layoutInfo.editable.attr('contenteditable', false);
        this.invoke('toolbar.deactivate', true);

        this.triggerEvent('disable', true);
      }

      triggerEvent() {
        const namespace = lists.head(arguments);
        const args = lists.tail(lists.from(arguments));

        const callback = this.options.callbacks[func.namespaceToCamel(namespace, 'on')];
        Iif (callback) {
          callback.apply(this.$note[0], args);
        }
        this.$note.trigger('summernote.' + namespace, args);
      }

      initializeModule(key) {
        const module = this.modules[key];
        module.shouldInitialize = module.shouldInitialize || func.ok;
        if (!module.shouldInitialize()) {
          return;
        }

        // initialize module
        if (module.initialize) {
          module.initialize();
        }

        // attach events
        if (module.events) {
          dom.attachEvents(this.$note, module.events);
        }
      }

      module(key, ModuleClass, withoutIntialize) {
        Iif (arguments.length === 1) {
          return this.modules[key];
        }

        this.modules[key] = new ModuleClass(this);

        Iif (!withoutIntialize) {
          this.initializeModule(key);
        }
      }

      removeModule(key) {
        const module = this.modules[key];
        if (module.shouldInitialize()) {
          if (module.events) {
            dom.detachEvents(this.$note, module.events);
          }

          if (module.destroy) {
            module.destroy();
          }
        }

        delete this.modules[key];
      }

      memo(key, obj) {
        if (arguments.length === 1) {
          return this.memos[key];
        }
        this.memos[key] = obj;
      }

      removeMemo(key) {
        Iif (this.memos[key] && this.memos[key].destroy) {
          this.memos[key].destroy();
        }

        delete this.memos[key];
      }

      /**
       * Some buttons need to change their visual style immediately once they get pressed
       */
      createInvokeHandlerAndUpdateState(namespace, value) {
        return (event) => {
          this.createInvokeHandler(namespace, value)(event);
          this.invoke('buttons.updateCurrentStyle');
        };
      }

      createInvokeHandler(namespace, value) {
        return (event) => {
          event.preventDefault();
          const $target = $(event.target);
          this.invoke(namespace, value || $target.closest('[data-value]').data('value'), $target);
        };
      }

      invoke() {
        const namespace = lists.head(arguments);
        const args = lists.tail(lists.from(arguments));

        const splits = namespace.split('.');
        const hasSeparator = splits.length > 1;
        const moduleName = hasSeparator && lists.head(splits);
        const methodName = hasSeparator ? lists.last(splits) : lists.head(splits);

        const module = this.modules[moduleName || 'editor'];
        if (!moduleName && this[methodName]) {
          return this[methodName].apply(this, args);
        } else Eif (module && module[methodName] && module.shouldInitialize()) {
          return module[methodName].apply(module, args);
        }
      }
    }