/**
 * @license
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import '../../../styles/shared-styles.js';
import '../../shared/gr-button/gr-button.js';
import '../../shared/gr-diff-preferences/gr-diff-preferences.js';
import '../../shared/gr-overlay/gr-overlay.js';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {htmlTemplate} from './gr-diff-preferences-dialog_html.js';

/**
 * @extends PolymerElement
 */
class GrDiffPreferencesDialog extends GestureEventListeners(
    LegacyElementMixin(PolymerElement)) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-diff-preferences-dialog'; }

  static get properties() {
    return {
      /** @type {?} */
      diffPrefs: Object,

      /**
       * _editableDiffPrefs is a clone of diffPrefs.
       * All changes in the dialog are applied to this object
       * immediately, when a value in an editor is changed.
       * The "Save" button replaces the "diffPrefs" object with
       * the value of _editableDiffPrefs.
       *
       * @type {?}
       */
      _editableDiffPrefs: Object,

      _diffPrefsChanged: Boolean,
    };
  }

  getFocusStops() {
    return {
      start: this.$.diffPreferences.$.contextSelect,
      end: this.$.saveButton,
    };
  }

  resetFocus() {
    this.$.diffPreferences.$.contextSelect.focus();
  }

  _computeHeaderClass(changed) {
    return changed ? 'edited' : '';
  }

  _handleCancelDiff(e) {
    e.stopPropagation();
    this.$.diffPrefsOverlay.close();
  }

  open() {
    // JSON.parse(JSON.stringify(...)) makes a deep clone of diffPrefs.
    // It is known, that diffPrefs is obtained from an RestAPI call and
    // it is safe to clone the object this way.
    this._editableDiffPrefs = JSON.parse(JSON.stringify(this.diffPrefs));
    this.$.diffPrefsOverlay.open().then(() => {
      const focusStops = this.getFocusStops();
      this.$.diffPrefsOverlay.setFocusStops(focusStops);
      this.resetFocus();
    });
  }

  _handleSaveDiffPreferences() {
    this.diffPrefs = this._editableDiffPrefs;
    this.$.diffPreferences.save().then(() => {
      this.dispatchEvent(new CustomEvent('reload-diff-preference', {
        composed: true, bubbles: false,
      }));

      this.$.diffPrefsOverlay.close();
    });
  }
}

customElements.define(GrDiffPreferencesDialog.is, GrDiffPreferencesDialog);