/**
 * @license
 * Copyright (C) 2016 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';

  /**
   * @appliesMixin Gerrit.FireMixin
   * @appliesMixin Gerrit.PatchSetMixin
   * @appliesMixin Gerrit.RESTClientMixin
   * @extends Polymer.Element
   */
  class GrDownloadDialog extends Polymer.mixinBehaviors( [
    Gerrit.FireBehavior,
    Gerrit.PatchSetBehavior,
    Gerrit.RESTClientBehavior,
  ], Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element))) {
    static get is() { return 'gr-download-dialog'; }
    /**
     * Fired when the user presses the close button.
     *
     * @event close
     */

    static get properties() {
      return {
      /** @type {{ revisions: Array }} */
        change: Object,
        patchNum: String,
        /** @type {?} */
        config: Object,

        _schemes: {
          type: Array,
          value() { return []; },
          computed: '_computeSchemes(change, patchNum)',
          observer: '_schemesChanged',
        },
        _selectedScheme: String,
      };
    }

    /** @override */
    ready() {
      super.ready();
      this._ensureAttribute('role', 'dialog');
    }

    focus() {
      if (this._schemes.length) {
        this.$.downloadCommands.focusOnCopy();
      } else {
        this.$.download.focus();
      }
    }

    getFocusStops() {
      const links = this.shadowRoot
          .querySelector('#archives').querySelectorAll('a');
      return {
        start: this.$.closeButton,
        end: links[links.length - 1],
      };
    }

    _computeDownloadCommands(change, patchNum, _selectedScheme) {
      let commandObj;
      if (!change) return [];
      for (const rev of Object.values(change.revisions || {})) {
        if (this.patchNumEquals(rev._number, patchNum) &&
            rev && rev.fetch && rev.fetch.hasOwnProperty(_selectedScheme)) {
          commandObj = rev.fetch[_selectedScheme].commands;
          break;
        }
      }
      const commands = [];
      for (const title in commandObj) {
        if (!commandObj || !commandObj.hasOwnProperty(title)) { continue; }
        commands.push({
          title,
          command: commandObj[title],
        });
      }
      return commands;
    }

    /**
     * @param {!Object} change
     * @param {number|string} patchNum
     *
     * @return {string}
     */
    _computeZipDownloadLink(change, patchNum) {
      return this._computeDownloadLink(change, patchNum, true);
    }

    /**
     * @param {!Object} change
     * @param {number|string} patchNum
     *
     * @return {string}
     */
    _computeZipDownloadFilename(change, patchNum) {
      return this._computeDownloadFilename(change, patchNum, true);
    }

    /**
     * @param {!Object} change
     * @param {number|string} patchNum
     * @param {boolean=} opt_zip
     *
     * @return {string} Not sure why there was a mismatch
     */
    _computeDownloadLink(change, patchNum, opt_zip) {
      // Polymer 2: check for undefined
      if ([change, patchNum].some(arg => arg === undefined)) {
        return '';
      }
      return this.changeBaseURL(change.project, change._number, patchNum) +
          '/patch?' + (opt_zip ? 'zip' : 'download');
    }

    /**
     * @param {!Object} change
     * @param {number|string} patchNum
     * @param {boolean=} opt_zip
     *
     * @return {string}
     */
    _computeDownloadFilename(change, patchNum, opt_zip) {
      // Polymer 2: check for undefined
      if ([change, patchNum].some(arg => arg === undefined)) {
        return '';
      }

      let shortRev = '';
      for (const rev in change.revisions) {
        if (this.patchNumEquals(change.revisions[rev]._number, patchNum)) {
          shortRev = rev.substr(0, 7);
          break;
        }
      }
      return shortRev + '.diff.' + (opt_zip ? 'zip' : 'base64');
    }

    _computeHidePatchFile(change, patchNum) {
      // Polymer 2: check for undefined
      if ([change, patchNum].some(arg => arg === undefined)) {
        return false;
      }
      for (const rev of Object.values(change.revisions || {})) {
        if (this.patchNumEquals(rev._number, patchNum)) {
          const parentLength = rev.commit && rev.commit.parents ?
            rev.commit.parents.length : 0;
          return parentLength == 0;
        }
      }
      return false;
    }

    _computeArchiveDownloadLink(change, patchNum, format) {
      // Polymer 2: check for undefined
      if ([change, patchNum, format].some(arg => arg === undefined)) {
        return '';
      }
      return this.changeBaseURL(change.project, change._number, patchNum) +
          '/archive?format=' + format;
    }

    _computeSchemes(change, patchNum) {
      // Polymer 2: check for undefined
      if ([change, patchNum].some(arg => arg === undefined)) {
        return [];
      }

      for (const rev of Object.values(change.revisions || {})) {
        if (this.patchNumEquals(rev._number, patchNum)) {
          const fetch = rev.fetch;
          if (fetch) {
            return Object.keys(fetch).sort();
          }
          break;
        }
      }
      return [];
    }

    _computePatchSetQuantity(revisions) {
      if (!revisions) { return 0; }
      return Object.keys(revisions).length;
    }

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

    _schemesChanged(schemes) {
      if (schemes.length === 0) { return; }
      if (!schemes.includes(this._selectedScheme)) {
        this._selectedScheme = schemes.sort()[0];
      }
    }

    _computeShowDownloadCommands(schemes) {
      return schemes.length ? '' : 'hidden';
    }
  }

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