/**
 * @license
 * Copyright (C) 2017 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 '../../diff/gr-diff-mode-selector/gr-diff-mode-selector.js';
import '../../diff/gr-patch-range-select/gr-patch-range-select.js';
import '../../edit/gr-edit-controls/gr-edit-controls.js';
import '../../shared/gr-editable-label/gr-editable-label.js';
import '../../shared/gr-linked-chip/gr-linked-chip.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
import '../../shared/gr-select/gr-select.js';
import '../../shared/gr-button/gr-button.js';
import '../../shared/gr-icons/gr-icons.js';
import '../gr-commit-info/gr-commit-info.js';
import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.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-file-list-header_html.js';
import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.js';
import {GrFileListConstants} from '../gr-file-list-constants.js';
import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
import {
  computeLatestPatchNum,
  getRevisionByPatchNum,
  patchNumEquals,
} from '../../../utils/patch-set-util.js';

// Maximum length for patch set descriptions.
const PATCH_DESC_MAX_LENGTH = 500;
const MERGED_STATUS = 'MERGED';

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

  static get is() { return 'gr-file-list-header'; }
  /**
   * @event expand-diffs
   */

  /**
   * @event collapse-diffs
   */

  /**
   * @event open-diff-prefs
   */

  /**
   * @event open-included-in-dialog
   */

  /**
   * @event open-download-dialog
   */

  /**
   * @event open-upload-help-dialog
   */

  static get properties() {
    return {
      account: Object,
      allPatchSets: Array,
      /** @type {?} */
      change: Object,
      changeNum: String,
      changeUrl: String,
      changeComments: Object,
      commitInfo: Object,
      editMode: Boolean,
      loggedIn: Boolean,
      serverConfig: Object,
      shownFileCount: Number,
      diffPrefs: Object,
      diffPrefsDisabled: Boolean,
      diffViewMode: {
        type: String,
        notify: true,
      },
      patchNum: String,
      basePatchNum: String,
      filesExpanded: String,
      // Caps the number of files that can be shown and have the 'show diffs' /
      // 'hide diffs' buttons still be functional.
      _maxFilesForBulkActions: {
        type: Number,
        readOnly: true,
        value: 225,
      },
      _patchsetDescription: {
        type: String,
        value: '',
      },
      _descriptionReadOnly: {
        type: Boolean,
        computed: '_computeDescriptionReadOnly(loggedIn, change, account)',
      },
      revisionInfo: Object,
    };
  }

  static get observers() {
    return [
      '_computePatchSetDescription(change, patchNum)',
    ];
  }

  setDiffViewMode(mode) {
    this.$.modeSelect.setMode(mode);
  }

  _expandAllDiffs() {
    this._expanded = true;
    this.dispatchEvent(new CustomEvent('expand-diffs', {
      composed: true, bubbles: true,
    }));
  }

  _collapseAllDiffs() {
    this._expanded = false;
    this.dispatchEvent(new CustomEvent('collapse-diffs', {
      composed: true, bubbles: true,
    }));
  }

  _computeExpandedClass(filesExpanded) {
    const classes = [];
    if (filesExpanded === GrFileListConstants.FilesExpandedState.ALL) {
      classes.push('expanded');
    }
    if (filesExpanded === GrFileListConstants.FilesExpandedState.SOME ||
          filesExpanded === GrFileListConstants.FilesExpandedState.ALL) {
      classes.push('openFile');
    }
    return classes.join(' ');
  }

  _computeDescriptionPlaceholder(readOnly) {
    return (readOnly ? 'No' : 'Add') + ' patchset description';
  }

  _computeDescriptionReadOnly(loggedIn, change, account) {
    // Polymer 2: check for undefined
    if ([loggedIn, change, account].includes(undefined)) {
      return undefined;
    }

    return !(loggedIn && (account._account_id === change.owner._account_id));
  }

  _computePatchSetDescription(change, patchNum) {
    // Polymer 2: check for undefined
    if ([change, patchNum].includes(undefined)) {
      return;
    }

    const rev = getRevisionByPatchNum(change.revisions, patchNum);
    this._patchsetDescription = (rev && rev.description) ?
      rev.description.substring(0, PATCH_DESC_MAX_LENGTH) : '';
  }

  _handleDescriptionRemoved(e) {
    return this._updateDescription('', e);
  }

  /**
   * @param {!Object} revisions The revisions object keyed by revision hashes
   * @param {?Object} patchSet A revision already fetched from {revisions}
   * @return {string|undefined} the SHA hash corresponding to the revision.
   */
  _getPatchsetHash(revisions, patchSet) {
    for (const rev in revisions) {
      if (revisions.hasOwnProperty(rev) &&
          revisions[rev] === patchSet) {
        return rev;
      }
    }
  }

  _handleDescriptionChanged(e) {
    const desc = e.detail.trim();
    this._updateDescription(desc, e);
  }

  /**
   * Update the patchset description with the rest API.
   *
   * @param {string} desc
   * @param {?(Event|Node)} e
   * @return {!Promise}
   */
  _updateDescription(desc, e) {
    const target = dom(e).rootTarget;
    if (target) { target.disabled = true; }
    const rev = getRevisionByPatchNum(this.change.revisions,
        this.patchNum);
    const sha = this._getPatchsetHash(this.change.revisions, rev);
    return this.$.restAPI.setDescription(this.changeNum, this.patchNum, desc)
        .then(res => {
          if (res.ok) {
            if (target) { target.disabled = false; }
            this.set(['change', 'revisions', sha, 'description'], desc);
            this._patchsetDescription = desc;
          }
        })
        .catch(err => {
          if (target) { target.disabled = false; }
          return;
        });
  }

  _computePrefsButtonHidden(prefs, diffPrefsDisabled) {
    return diffPrefsDisabled || !prefs;
  }

  _fileListActionsVisible(shownFileCount, maxFilesForBulkActions) {
    return shownFileCount <= maxFilesForBulkActions;
  }

  _handlePatchChange(e) {
    const {basePatchNum, patchNum} = e.detail;
    if (patchNumEquals(basePatchNum, this.basePatchNum) &&
        patchNumEquals(patchNum, this.patchNum)) { return; }
    GerritNav.navigateToChange(this.change, patchNum, basePatchNum);
  }

  _handlePrefsTap(e) {
    e.preventDefault();
    this.dispatchEvent(new CustomEvent('open-diff-prefs', {
      composed: true, bubbles: true,
    }));
  }

  _handleIncludedInTap(e) {
    e.preventDefault();
    this.dispatchEvent(new CustomEvent('open-included-in-dialog', {
      composed: true, bubbles: true,
    }));
  }

  _handleDownloadTap(e) {
    e.preventDefault();
    e.stopPropagation();
    this.dispatchEvent(
        new CustomEvent('open-download-dialog', {bubbles: false}));
  }

  _computeEditModeClass(editMode) {
    return editMode ? 'editMode' : '';
  }

  _computePatchInfoClass(patchNum, allPatchSets) {
    const latestNum = computeLatestPatchNum(allPatchSets);
    if (patchNumEquals(patchNum, latestNum)) {
      return '';
    }
    return 'patchInfoOldPatchSet';
  }

  _hideIncludedIn(change) {
    return change && change.status === MERGED_STATUS ? '' : 'hide';
  }

  _handleUploadTap(e) {
    e.preventDefault();
    e.stopPropagation();
    this.dispatchEvent(
        new CustomEvent('open-upload-help-dialog', {bubbles: false}));
  }

  _computeUploadHelpContainerClass(change, account) {
    const changeIsMerged = change && change.status === MERGED_STATUS;
    const ownerId = change && change.owner && change.owner._account_id ?
      change.owner._account_id : null;
    const userId = account && account._account_id;
    const userIsOwner = ownerId && userId && ownerId === userId;
    const hideContainer = !userIsOwner || changeIsMerged;
    return 'uploadContainer desktop' + (hideContainer ? ' hide' : '');
  }
}

customElements.define(GrFileListHeader.is, GrFileListHeader);