/**
 * @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 '@polymer/iron-input/iron-input.js';
import '../../../styles/gr-form-styles.js';
import '../../../styles/gr-table-styles.js';
import '../../../styles/shared-styles.js';
import '../../shared/gr-account-link/gr-account-link.js';
import '../../shared/gr-button/gr-button.js';
import '../../shared/gr-date-formatter/gr-date-formatter.js';
import '../../shared/gr-dialog/gr-dialog.js';
import '../../shared/gr-list-view/gr-list-view.js';
import '../../shared/gr-overlay/gr-overlay.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
import '../gr-create-pointer-dialog/gr-create-pointer-dialog.js';
import '../gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.js';
import {flush} 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-repo-detail-list_html.js';
import {ListViewMixin} from '../../../mixins/gr-list-view-mixin/gr-list-view-mixin.js';
import {encodeURL} from '../../../utils/url-util.js';

const DETAIL_TYPES = {
  BRANCHES: 'branches',
  TAGS: 'tags',
};

const PGP_START = '-----BEGIN PGP SIGNATURE-----';

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

  static get is() { return 'gr-repo-detail-list'; }

  static get properties() {
    return {
    /**
     * URL params passed from the router.
     */
      params: {
        type: Object,
        observer: '_paramsChanged',
      },
      /**
       * The kind of detail we are displaying, possibilities are determined by
       * the const DETAIL_TYPES.
       */
      detailType: String,

      _editing: {
        type: Boolean,
        value: false,
      },
      _isOwner: {
        type: Boolean,
        value: false,
      },
      _loggedIn: {
        type: Boolean,
        value: false,
      },
      /**
       * Offset of currently visible query results.
       */
      _offset: Number,
      _repo: Object,
      _items: Array,
      /**
       * Because  we request one more than the projectsPerPage, _shownProjects
       * maybe one less than _projects.
       */
      _shownItems: {
        type: Array,
        computed: 'computeShownItems(_items)',
      },
      _itemsPerPage: {
        type: Number,
        value: 25,
      },
      _loading: {
        type: Boolean,
        value: true,
      },
      _filter: String,
      _refName: String,
      _hasNewItemName: Boolean,
      _isEditing: Boolean,
      _revisedRef: String,
    };
  }

  _determineIfOwner(repo) {
    return this.$.restAPI.getRepoAccess(repo)
        .then(access =>
          this._isOwner = access && !!access[repo].is_owner);
  }

  _paramsChanged(params) {
    if (!params || !params.repo) { return; }

    this._repo = params.repo;

    this._getLoggedIn().then(loggedIn => {
      this._loggedIn = loggedIn;
      if (loggedIn) {
        this._determineIfOwner(this._repo);
      }
    });

    this.detailType = params.detail;

    this._filter = this.getFilterValue(params);
    this._offset = this.getOffsetValue(params);

    return this._getItems(this._filter, this._repo,
        this._itemsPerPage, this._offset, this.detailType);
  }

  _getItems(filter, repo, itemsPerPage, offset, detailType) {
    this._loading = true;
    this._items = [];
    flush();
    const errFn = response => {
      this.dispatchEvent(new CustomEvent('page-error', {
        detail: {response},
        composed: true, bubbles: true,
      }));
    };
    if (detailType === DETAIL_TYPES.BRANCHES) {
      return this.$.restAPI.getRepoBranches(
          filter, repo, itemsPerPage, offset, errFn).then(items => {
        if (!items) { return; }
        this._items = items;
        this._loading = false;
      });
    } else if (detailType === DETAIL_TYPES.TAGS) {
      return this.$.restAPI.getRepoTags(
          filter, repo, itemsPerPage, offset, errFn).then(items => {
        if (!items) { return; }
        this._items = items;
        this._loading = false;
      });
    }
  }

  _getPath(repo) {
    return `/admin/repos/${encodeURL(repo, false)},` +
        `${this.detailType}`;
  }

  _computeWeblink(repo) {
    if (!repo.web_links) { return ''; }
    const webLinks = repo.web_links;
    return webLinks.length ? webLinks : null;
  }

  _computeMessage(message) {
    if (!message) { return; }
    // Strip PGP info.
    return message.split(PGP_START)[0];
  }

  _stripRefs(item, detailType) {
    if (detailType === DETAIL_TYPES.BRANCHES) {
      return item.replace('refs/heads/', '');
    } else if (detailType === DETAIL_TYPES.TAGS) {
      return item.replace('refs/tags/', '');
    }
  }

  _getLoggedIn() {
    return this.$.restAPI.getLoggedIn();
  }

  _computeEditingClass(isEditing) {
    return isEditing ? 'editing' : '';
  }

  _computeCanEditClass(ref, detailType, isOwner) {
    return isOwner && this._stripRefs(ref, detailType) === 'HEAD' ?
      'canEdit' : '';
  }

  _handleEditRevision(e) {
    this._revisedRef = e.model.get('item.revision');
    this._isEditing = true;
  }

  _handleCancelRevision() {
    this._isEditing = false;
  }

  _handleSaveRevision(e) {
    this._setRepoHead(this._repo, this._revisedRef, e);
  }

  _setRepoHead(repo, ref, e) {
    return this.$.restAPI.setRepoHead(repo, ref).then(res => {
      if (res.status < 400) {
        this._isEditing = false;
        e.model.set('item.revision', ref);
        // This is needed to refresh _items property with fresh data,
        // specifically can_delete from the json response.
        this._getItems(
            this._filter, this._repo, this._itemsPerPage,
            this._offset, this.detailType);
      }
    });
  }

  _computeItemName(detailType) {
    if (detailType === DETAIL_TYPES.BRANCHES) {
      return 'Branch';
    } else if (detailType === DETAIL_TYPES.TAGS) {
      return 'Tag';
    }
  }

  _handleDeleteItemConfirm() {
    this.$.overlay.close();
    if (this.detailType === DETAIL_TYPES.BRANCHES) {
      return this.$.restAPI.deleteRepoBranches(this._repo, this._refName)
          .then(itemDeleted => {
            if (itemDeleted.status === 204) {
              this._getItems(
                  this._filter, this._repo, this._itemsPerPage,
                  this._offset, this.detailType);
            }
          });
    } else if (this.detailType === DETAIL_TYPES.TAGS) {
      return this.$.restAPI.deleteRepoTags(this._repo, this._refName)
          .then(itemDeleted => {
            if (itemDeleted.status === 204) {
              this._getItems(
                  this._filter, this._repo, this._itemsPerPage,
                  this._offset, this.detailType);
            }
          });
    }
  }

  _handleConfirmDialogCancel() {
    this.$.overlay.close();
  }

  _handleDeleteItem(e) {
    const name = this._stripRefs(e.model.get('item.ref'), this.detailType);
    if (!name) { return; }
    this._refName = name;
    this.$.overlay.open();
  }

  _computeHideDeleteClass(owner, canDelete) {
    if (canDelete || owner) {
      return 'show';
    }

    return '';
  }

  _handleCreateItem() {
    this.$.createNewModal.handleCreateItem();
    this._handleCloseCreate();
  }

  _handleCloseCreate() {
    this.$.createOverlay.close();
  }

  _handleCreateClicked() {
    this.$.createOverlay.open();
  }

  _hideIfBranch(type) {
    if (type === DETAIL_TYPES.BRANCHES) {
      return 'hideItem';
    }

    return '';
  }

  _computeHideTagger(tagger) {
    return tagger ? '' : 'hide';
  }
}

customElements.define(GrRepoDetailList.is, GrRepoDetailList);