/**
 * @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 '../../../scripts/bundled-polymer.js';

import '@polymer/iron-input/iron-input.js';
import '../../shared/gr-autocomplete/gr-autocomplete.js';
import '../../shared/gr-button/gr-button.js';
import '../../shared/gr-dialog/gr-dialog.js';
import '../../shared/gr-dropdown/gr-dropdown.js';
import '../../shared/gr-overlay/gr-overlay.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
import '../../../styles/shared-styles.js';
import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class.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-edit-controls_html.js';
import {PatchSetBehavior} from '../../../behaviors/gr-patch-set-behavior/gr-patch-set-behavior.js';
import {GrEditConstants} from '../gr-edit-constants.js';
import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';

/**
 * @extends Polymer.Element
 */
class GrEditControls extends mixinBehaviors( [
  PatchSetBehavior,
], GestureEventListeners(
    LegacyElementMixin(
        PolymerElement))) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-edit-controls'; }

  static get properties() {
    return {
      change: Object,
      patchNum: String,

      /**
       * TODO(kaspern): by default, the RESTORE action should be hidden in the
       * file-list as it is a per-file action only. Remove this default value
       * when the Actions dictionary is moved to a shared constants file and
       * use the hiddenActions property in the parent component.
       */
      hiddenActions: {
        type: Array,
        value() { return [GrEditConstants.Actions.RESTORE.id]; },
      },

      _actions: {
        type: Array,
        value() { return Object.values(GrEditConstants.Actions); },
      },
      _path: {
        type: String,
        value: '',
      },
      _newPath: {
        type: String,
        value: '',
      },
      _query: {
        type: Function,
        value() {
          return this._queryFiles.bind(this);
        },
      },
    };
  }

  _handleTap(e) {
    e.preventDefault();
    const action = dom(e).localTarget.id;
    switch (action) {
      case GrEditConstants.Actions.OPEN.id:
        this.openOpenDialog();
        return;
      case GrEditConstants.Actions.DELETE.id:
        this.openDeleteDialog();
        return;
      case GrEditConstants.Actions.RENAME.id:
        this.openRenameDialog();
        return;
      case GrEditConstants.Actions.RESTORE.id:
        this.openRestoreDialog();
        return;
    }
  }

  /**
   * @param {string=} opt_path
   */
  openOpenDialog(opt_path) {
    if (opt_path) { this._path = opt_path; }
    return this._showDialog(this.$.openDialog);
  }

  /**
   * @param {string=} opt_path
   */
  openDeleteDialog(opt_path) {
    if (opt_path) { this._path = opt_path; }
    return this._showDialog(this.$.deleteDialog);
  }

  /**
   * @param {string=} opt_path
   */
  openRenameDialog(opt_path) {
    if (opt_path) { this._path = opt_path; }
    return this._showDialog(this.$.renameDialog);
  }

  /**
   * @param {string=} opt_path
   */
  openRestoreDialog(opt_path) {
    if (opt_path) { this._path = opt_path; }
    return this._showDialog(this.$.restoreDialog);
  }

  /**
   * Given a path string, checks that it is a valid file path.
   *
   * @param {string} path
   * @return {boolean}
   */
  _isValidPath(path) {
    // Double negation needed for strict boolean return type.
    return !!path.length && !path.endsWith('/');
  }

  _computeRenameDisabled(path, newPath) {
    return this._isValidPath(path) && this._isValidPath(newPath);
  }

  /**
   * Given a dom event, gets the dialog that lies along this event path.
   *
   * @param {!Event} e
   * @return {!Element|undefined}
   */
  _getDialogFromEvent(e) {
    return dom(e).path.find(element => {
      if (!element.classList) { return false; }
      return element.classList.contains('dialog');
    });
  }

  _showDialog(dialog) {
    // Some dialogs may not fire their on-close event when closed in certain
    // ways (e.g. by clicking outside the dialog body). This call prevents
    // multiple dialogs from being shown in the same overlay.
    this._hideAllDialogs();

    return this.$.overlay.open().then(() => {
      dialog.classList.toggle('invisible', false);
      const autocomplete = dialog.querySelector('gr-autocomplete');
      if (autocomplete) { autocomplete.focus(); }
      this.async(() => { this.$.overlay.center(); }, 1);
    });
  }

  _hideAllDialogs() {
    const dialogs = dom(this.root).querySelectorAll('.dialog');
    for (const dialog of dialogs) { this._closeDialog(dialog); }
  }

  /**
   * @param {Element|undefined} dialog
   * @param {boolean=} clearInputs
   */
  _closeDialog(dialog, clearInputs) {
    if (!dialog) { return; }

    if (clearInputs) {
      // Dialog may have autocompletes and plain inputs -- as these have
      // different properties representing their bound text, it is easier to
      // just make two separate queries.
      dialog.querySelectorAll('gr-autocomplete')
          .forEach(input => { input.text = ''; });

      dialog.querySelectorAll('iron-input')
          .forEach(input => { input.bindValue = ''; });
    }

    dialog.classList.toggle('invisible', true);
    return this.$.overlay.close();
  }

  _handleDialogCancel(e) {
    this._closeDialog(this._getDialogFromEvent(e));
  }

  _handleOpenConfirm(e) {
    const url = GerritNav.getEditUrlForDiff(this.change, this._path,
        this.patchNum);
    GerritNav.navigateToRelativeUrl(url);
    this._closeDialog(this._getDialogFromEvent(e), true);
  }

  _handleUploadConfirm(path, fileData) {
    if (!this.change || !path || !fileData) {
      this._closeDialog(this.$.openDialog, true);
      return;
    }
    this.$.restAPI.saveFileUploadChangeEdit(this.change._number, path,
        fileData).then(res => {
      if (!res.ok) { return; }

      this._closeDialog(this.$.openDialog, true);
      const url = GerritNav.getUrlForChange(
          this.change, this.patchNum, undefined, true);
      GerritNav.navigateToRelativeUrl(url);
    });
  }

  _handleDeleteConfirm(e) {
    // Get the dialog before the api call as the event will change during bubbling
    // which will make Polymer.dom(e).path an emtpy array in polymer 2
    const dialog = this._getDialogFromEvent(e);
    this.$.restAPI.deleteFileInChangeEdit(this.change._number, this._path)
        .then(res => {
          if (!res.ok) { return; }
          this._closeDialog(dialog, true);
          GerritNav.navigateToChange(this.change);
        });
  }

  _handleRestoreConfirm(e) {
    const dialog = this._getDialogFromEvent(e);
    this.$.restAPI.restoreFileInChangeEdit(this.change._number, this._path)
        .then(res => {
          if (!res.ok) { return; }
          this._closeDialog(dialog, true);
          GerritNav.navigateToChange(this.change);
        });
  }

  _handleRenameConfirm(e) {
    const dialog = this._getDialogFromEvent(e);
    return this.$.restAPI.renameFileInChangeEdit(this.change._number,
        this._path, this._newPath).then(res => {
      if (!res.ok) { return; }
      this._closeDialog(dialog, true);
      GerritNav.navigateToChange(this.change);
    });
  }

  _queryFiles(input) {
    return this.$.restAPI.queryChangeFiles(this.change._number,
        this.patchNum, input).then(res => res.map(file => {
      return {name: file};
    }));
  }

  _computeIsInvisible(id, hiddenActions) {
    return hiddenActions.includes(id) ? 'invisible' : '';
  }

  _handleDragAndDropUpload(event) {
    // We prevent the default clicking.
    event.preventDefault();
    event.stopPropagation();

    this._fileUpload(event);
  }

  _handleFileUploadChanged(event) {
    this._fileUpload(event);
  }

  _fileUpload(event) {
    const e = event.target.files || event.dataTransfer.files;
    for (const file of e) {
      if (!file) continue;

      let path = this._path;
      if (!path) {
        path = file.name;
      }

      const fr = new FileReader();
      fr.file = file;
      fr.onload = fileLoadEvent => {
        if (!fileLoadEvent) return;
        const fileData = fileLoadEvent.target.result;
        this._handleUploadConfirm(path, fileData);
      };
      fr.readAsDataURL(file);
    }
  }
}

customElements.define(GrEditControls.is, GrEditControls);