/*
 * Copyright (c) 2010, 2023 BSI Business Systems Integration AG
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 */
import $ from 'jquery';
import {ProposalChooserLayoutResetter, Table} from '../../../index';

/**
 * This class is used to reset and restore styles in the DOM, so we can measure the preferred size of the table.
 */
export class TableLayoutResetter implements ProposalChooserLayoutResetter {
  cssSelector: string;
  protected _table: Table;
  protected _fillerWidth: string;

  constructor(table: Table) {
    this._table = table;
    this._fillerWidth = null;
    this.cssSelector = '.table';
  }

  /**
   * Modifies the table in a way that the preferred width may be read.
   * Removes explicit widths on rows, cells, fillers and sets display to inline-block.
   */
  modifyDom() {
    this._table.$container
      .css('display', 'inline-block')
      .css('width', 'auto')
      .css('height', 'auto');
    this._table.$data
      .css('display', 'inline-block');

    this._modifyFiller(this._table.$fillBefore);
    this._modifyFiller(this._table.$fillAfter);
    this._modifyTableData(this._cssBackup);
  }

  restoreDom() {
    this._table.$container
      .css('display', 'block')
      .css('width', '100%')
      .css('height', '100%');
    this._table.$data
      .css('display', 'block');

    this._restoreFiller(this._table.$fillBefore);
    this._restoreFiller(this._table.$fillAfter);
    this._modifyTableData(this._cssRestore);
  }

  /**
   * Clears the given CSS property and stores the old value as data with prefix 'backup'
   * which is used to restore the CSS property later.
   */
  protected _cssBackup($element: JQuery, property: string) {
    let oldValue = $element.css(property);
    $element
      .css(property, '')
      .data('backup' + property, oldValue);
  }

  protected _cssRestore($element: JQuery, property: string) {
    let dataProperty = 'backup' + property,
      oldValue = $element.data(dataProperty);
    $element
      .css(property, oldValue)
      .removeData(dataProperty);
  }

  /**
   * Go through all rows and cells and call the given modifyFunc (backup/restore) on each element.
   */
  protected _modifyTableData(modifyFunc: ($element: JQuery, property: string) => void) {
    let that = this;
    this._table.$rows().each(function() {
      let $row = $(this);
      modifyFunc($row, 'width');
      that._table.$cellsForRow($row).each(function() {
        let $cell = $(this);
        modifyFunc($cell, 'min-width');
        modifyFunc($cell, 'max-width');
      });
    });
  }

  protected _modifyFiller($filler: JQuery) {
    if ($filler) {
      this._fillerWidth = $filler.css('width');
      $filler.css('width', '');
    }
  }

  protected _restoreFiller($filler: JQuery) {
    if ($filler) {
      $filler.css('width', this._fillerWidth);
    }
  }
}