/**
 * @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-autogrow-textarea/iron-autogrow-textarea';
import '../../../styles/gr-form-styles';
import '../../../styles/gr-subpage-styles';
import '../../../styles/gr-table-styles';
import '../../../styles/shared-styles';
import '../../shared/gr-account-link/gr-account-link';
import '../../shared/gr-autocomplete/gr-autocomplete';
import '../../shared/gr-button/gr-button';
import '../../shared/gr-overlay/gr-overlay';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface';
import '../gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
import {PolymerElement} from '@polymer/polymer/polymer-element';
import {htmlTemplate} from './gr-group-members_html';
import {getBaseUrl} from '../../../utils/url-util';
import {customElement, property} from '@polymer/decorators';
import {
  RestApiService,
  ErrorCallback,
} from '../../../services/services/gr-rest-api/gr-rest-api';
import {GrOverlay} from '../../shared/gr-overlay/gr-overlay';
import {
  GroupId,
  AccountId,
  AccountInfo,
  GroupInfo,
  GroupName,
} from '../../../types/common';
import {AutocompleteQuery} from '../../shared/gr-autocomplete/gr-autocomplete';
import {PolymerDomRepeatEvent} from '../../../types/types';
import {hasOwnProperty} from '../../../utils/common-util';

const SUGGESTIONS_LIMIT = 15;
const SAVING_ERROR_TEXT =
  'Group may not exist, or you may not have ' + 'permission to add it';

const URL_REGEX = '^(?:[a-z]+:)?//';

export interface GrGroupMembers {
  $: {
    restAPI: RestApiService & Element;
    overlay: GrOverlay;
  };
}
@customElement('gr-group-members')
export class GrGroupMembers extends GestureEventListeners(
  LegacyElementMixin(PolymerElement)
) {
  static get template() {
    return htmlTemplate;
  }

  @property({type: Number})
  groupId?: GroupId;

  @property({type: Number})
  _groupMemberSearchId?: number;

  @property({type: String})
  _groupMemberSearchName?: string;

  @property({type: String})
  _includedGroupSearchId?: string;

  @property({type: String})
  _includedGroupSearchName?: string;

  @property({type: Boolean})
  _loading = true;

  @property({type: String})
  _groupName?: GroupName;

  @property({type: Object})
  _groupMembers?: AccountInfo[];

  @property({type: Object})
  _includedGroups?: GroupInfo[];

  @property({type: String})
  _itemName?: GroupInfo | AccountInfo;

  @property({type: String})
  _itemType?: string;

  @property({type: Object})
  _queryMembers: AutocompleteQuery;

  @property({type: Object})
  _queryIncludedGroup: AutocompleteQuery;

  @property({type: Boolean})
  _groupOwner = false;

  @property({type: Boolean})
  _isAdmin = false;

  _itemId?: AccountId | GroupId;

  constructor() {
    super();
    this._queryMembers = input => this._getAccountSuggestions(input);
    this._queryIncludedGroup = input => this._getGroupSuggestions(input);
  }

  /** @override */
  attached() {
    super.attached();
    this._loadGroupDetails();

    this.dispatchEvent(
      new CustomEvent('title-change', {
        detail: {title: 'Members'},
        composed: true,
        bubbles: true,
      })
    );
  }

  _loadGroupDetails() {
    if (!this.groupId) {
      return;
    }

    const promises: Promise<void>[] = [];

    const errFn: ErrorCallback = response => {
      this.dispatchEvent(
        new CustomEvent('page-error', {
          detail: {response},
          composed: true,
          bubbles: true,
        })
      );
    };

    return this.$.restAPI.getGroupConfig(this.groupId, errFn).then(config => {
      if (!config || !config.name) {
        return Promise.resolve();
      }

      this._groupName = config.name;

      promises.push(
        this.$.restAPI.getIsAdmin().then(isAdmin => {
          this._isAdmin = !!isAdmin;
        })
      );

      promises.push(
        this.$.restAPI.getIsGroupOwner(this._groupName).then(isOwner => {
          this._groupOwner = !!isOwner;
        })
      );

      promises.push(
        this.$.restAPI.getGroupMembers(this._groupName).then(members => {
          this._groupMembers = members;
        })
      );

      promises.push(
        this.$.restAPI.getIncludedGroup(this._groupName).then(includedGroup => {
          this._includedGroups = includedGroup;
        })
      );

      return Promise.all(promises).then(() => {
        this._loading = false;
      });
    });
  }

  _computeLoadingClass(loading: boolean) {
    return loading ? 'loading' : '';
  }

  _isLoading() {
    return this._loading || this._loading === undefined;
  }

  _computeGroupUrl(url: string) {
    if (!url) {
      return;
    }

    const r = new RegExp(URL_REGEX, 'i');
    if (r.test(url)) {
      return url;
    }

    // For GWT compatibility
    if (url.startsWith('#')) {
      return getBaseUrl() + url.slice(1);
    }
    return getBaseUrl() + url;
  }

  _handleSavingGroupMember() {
    if (!this._groupName) {
      return Promise.reject(new Error('group name undefined'));
    }
    return this.$.restAPI
      .saveGroupMember(this._groupName, this._groupMemberSearchId as AccountId)
      .then(config => {
        if (!config || !this._groupName) {
          return;
        }
        this.$.restAPI.getGroupMembers(this._groupName).then(members => {
          this._groupMembers = members;
        });
        this._groupMemberSearchName = '';
        this._groupMemberSearchId = undefined;
      });
  }

  _handleDeleteConfirm() {
    if (!this._groupName) {
      return Promise.reject(new Error('group name undefined'));
    }
    this.$.overlay.close();
    if (this._itemType === 'member') {
      return this.$.restAPI
        .deleteGroupMember(this._groupName, this._itemId! as AccountId)
        .then(itemDeleted => {
          if (itemDeleted.status === 204 && this._groupName) {
            this.$.restAPI.getGroupMembers(this._groupName).then(members => {
              this._groupMembers = members;
            });
          }
        });
    } else if (this._itemType === 'includedGroup') {
      return this.$.restAPI
        .deleteIncludedGroup(this._groupName, this._itemId! as GroupId)
        .then(itemDeleted => {
          if (
            (itemDeleted.status === 204 || itemDeleted.status === 205) &&
            this._groupName
          ) {
            this.$.restAPI
              .getIncludedGroup(this._groupName)
              .then(includedGroup => {
                this._includedGroups = includedGroup;
              });
          }
        });
    }
    return Promise.reject(new Error('Unrecognized item type'));
  }

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

  _handleDeleteMember(e: PolymerDomRepeatEvent<AccountInfo>) {
    const id = (e.model.get('item._account_id') as unknown) as AccountId;
    const name = e.model.get('item.name');
    const username = e.model.get('item.username');
    const email = e.model.get('item.email');
    const item = username || name || email || id;
    if (!item) {
      return;
    }
    this._itemName = item;
    this._itemId = id;
    this._itemType = 'member';
    this.$.overlay.open();
  }

  _handleSavingIncludedGroups() {
    if (!this._groupName || !this._includedGroupSearchId) {
      return Promise.reject(
        new Error('group name or includedGroupSearchId undefined')
      );
    }
    return this.$.restAPI
      .saveIncludedGroup(
        this._groupName,
        this._includedGroupSearchId.replace(/\+/g, ' ') as GroupId,
        (errResponse, err) => {
          if (errResponse) {
            if (errResponse.status === 404) {
              this.dispatchEvent(
                new CustomEvent('show-alert', {
                  detail: {message: SAVING_ERROR_TEXT},
                  bubbles: true,
                  composed: true,
                })
              );
              return errResponse;
            }
            throw Error(errResponse.statusText);
          }
          throw err;
        }
      )
      .then(config => {
        if (!config || !this._groupName) {
          return;
        }
        this.$.restAPI.getIncludedGroup(this._groupName).then(includedGroup => {
          this._includedGroups = includedGroup;
        });
        this._includedGroupSearchName = '';
        this._includedGroupSearchId = '';
      });
  }

  _handleDeleteIncludedGroup(e: PolymerDomRepeatEvent<GroupInfo>) {
    const id = decodeURIComponent(`${e.model.get('item.id')}`).replace(
      /\+/g,
      ' '
    ) as GroupId;
    const name = e.model.get('item.name');
    const item = name || id;
    if (!item) {
      return;
    }
    this._itemName = item;
    this._itemId = id;
    this._itemType = 'includedGroup';
    this.$.overlay.open();
  }

  _getAccountSuggestions(input: string) {
    if (input.length === 0) {
      return Promise.resolve([]);
    }
    return this.$.restAPI
      .getSuggestedAccounts(input, SUGGESTIONS_LIMIT)
      .then(accounts => {
        const accountSuggestions = [];
        let nameAndEmail;
        if (!accounts) {
          return [];
        }
        for (const key in accounts) {
          if (!hasOwnProperty(accounts, key)) {
            continue;
          }
          if (accounts[key].email !== undefined) {
            nameAndEmail = `${accounts[key].name} <${accounts[key].email}>`;
          } else {
            nameAndEmail = accounts[key].name;
          }
          accountSuggestions.push({
            name: nameAndEmail,
            value: accounts[key]._account_id,
          });
        }
        return accountSuggestions;
      });
  }

  _getGroupSuggestions(input: string) {
    return this.$.restAPI.getSuggestedGroups(input).then(response => {
      const groups = [];
      for (const key in response) {
        if (!hasOwnProperty(response, key)) {
          continue;
        }
        groups.push({
          name: key,
          value: decodeURIComponent(response[key].id),
        });
      }
      return groups;
    });
  }

  _computeHideItemClass(owner: boolean, admin: boolean) {
    return admin || owner ? '' : 'canModify';
  }
}

declare global {
  interface HTMLElementTagNameMap {
    'gr-group-members': GrGroupMembers;
  }
}