/**
 * @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.
 */
(function() {
  'use strict';

  const ERR_COMMIT_NOT_FOUND =
      'Unable to find the commit hash of this change.';
  const CHANGE_SUBJECT_LIMIT = 50;

  /**
   * @appliesMixin Gerrit.FireMixin
   * @extends Polymer.Element
   */
  class GrConfirmRevertSubmissionDialog extends Polymer.mixinBehaviors( [
    Gerrit.FireBehavior,
  ], Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element))) {
    static get is() { return 'gr-confirm-revert-submission-dialog'; }
    /**
     * Fired when the confirm button is pressed.
     *
     * @event confirm
     */

    /**
     * Fired when the cancel button is pressed.
     *
     * @event cancel
     */

    static get properties() {
      return {
        message: String,
        commitMessage: String,
      };
    }

    _getTrimmedChangeSubject(subject) {
      if (!subject) return '';
      if (subject.length < CHANGE_SUBJECT_LIMIT) return subject;
      return subject.substring(0, CHANGE_SUBJECT_LIMIT) + '...';
    }

    _modifyRevertSubmissionMsg(change) {
      return this.$.jsAPI.modifyRevertSubmissionMsg(change,
          this.message, this.commitMessage);
    }

    _populateRevertSubmissionMessage(message, change, changes) {
      // Follow the same convention of the revert
      const commitHash = change.current_revision;
      if (!commitHash) {
        this.fire('show-alert', {message: ERR_COMMIT_NOT_FOUND});
        return;
      }
      const submissionId = change.submission_id;
      const revertTitle = 'Revert submission ' + submissionId;
      this.changes = changes;
      this.message = revertTitle + '\n\n' +
          'Reason for revert: <INSERT REASONING HERE>\n';
      this.message += 'Reverted Changes:\n';
      changes = changes || [];
      changes.forEach(change => {
        this.message += change.change_id.substring(0, 10) + ': ' +
          this._getTrimmedChangeSubject(change.subject) + '\n';
      });
      this.message = this._modifyRevertSubmissionMsg(change);
    }

    _handleConfirmTap(e) {
      e.preventDefault();
      e.stopPropagation();
      this.fire('confirm', null, {bubbles: false});
    }

    _handleCancelTap(e) {
      e.preventDefault();
      e.stopPropagation();
      this.fire('cancel', null, {bubbles: false});
    }
  }

  customElements.define(GrConfirmRevertSubmissionDialog.is,
      GrConfirmRevertSubmissionDialog);
})();