/**
 * @file
 * ContentEditable-based in-place editor for plain text content.
 */

(function($, _, Drupal) {
  Drupal.quickedit.editors.plain_text = Drupal.quickedit.EditorView.extend(
    /** @lends Drupal.quickedit.editors.plain_text# */ {
      /**
       * Stores the textual DOM element that is being in-place edited.
       */
      $textElement: null,

      /**
       * @constructs
       *
       * @augments Drupal.quickedit.EditorView
       *
       * @param {object} options
       *   Options for the plain text editor.
       */
      initialize(options) {
        Drupal.quickedit.EditorView.prototype.initialize.call(this, options);

        const editorModel = this.model;
        const fieldModel = this.fieldModel;

        // Store the original value of this field. Necessary for reverting
        // changes.
        const $fieldItems = this.$el.find('.quickedit-field');
        const $textElement = $fieldItems.length ? $fieldItems.eq(0) : this.$el;
        this.$textElement = $textElement;
        editorModel.set('originalValue', $.trim(this.$textElement.text()));

        // Sets the state to 'changed' whenever the value changes.
        let previousText = editorModel.get('originalValue');
        $textElement.on('keyup paste', event => {
          const currentText = $.trim($textElement.text());
          if (previousText !== currentText) {
            previousText = currentText;
            editorModel.set('currentValue', currentText);
            fieldModel.set('state', 'changed');
          }
        });
      },

      /**
       * @inheritdoc
       *
       * @return {jQuery}
       *   The text element for the plain text editor.
       */
      getEditedElement() {
        return this.$textElement;
      },

      /**
       * @inheritdoc
       *
       * @param {object} fieldModel
       *   The field model that holds the state.
       * @param {string} state
       *   The state to change to.
       * @param {object} options
       *   State options, if needed by the state change.
       */
      stateChange(fieldModel, state, options) {
        const from = fieldModel.previous('state');
        const to = state;
        switch (to) {
          case 'inactive':
            break;

          case 'candidate':
            if (from !== 'inactive') {
              this.$textElement.removeAttr('contenteditable');
            }
            if (from === 'invalid') {
              this.removeValidationErrors();
            }
            break;

          case 'highlighted':
            break;

          case 'activating':
            // Defer updating the field model until the current state change has
            // propagated, to not trigger a nested state change event.
            _.defer(() => {
              fieldModel.set('state', 'active');
            });
            break;

          case 'active':
            this.$textElement.attr('contenteditable', 'true');
            break;

          case 'changed':
            break;

          case 'saving':
            if (from === 'invalid') {
              this.removeValidationErrors();
            }
            this.save(options);
            break;

          case 'saved':
            break;

          case 'invalid':
            this.showValidationErrors();
            break;
        }
      },

      /**
       * @inheritdoc
       *
       * @return {object}
       *   A settings object for the quick edit UI.
       */
      getQuickEditUISettings() {
        return {
          padding: true,
          unifiedToolbar: false,
          fullWidthToolbar: false,
          popup: false,
        };
      },

      /**
       * @inheritdoc
       */
      revert() {
        this.$textElement.html(this.model.get('originalValue'));
      },
    },
  );
})(jQuery, _, Drupal);