/**
 * Copyright 2018 Google Inc. All Rights Reserved.
 *
 * 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 * as Api from '../../../api/v2';
import * as common from '../../../../../common';

/** @public */
export interface TableColumn
  extends Api.GoogleActionsV2UiElementsTableCardColumnProperties {
  /**
   * Alias for `horizontalAlignment`
   *
   * Horizontal alignment of content w.r.t column. If unspecified, content
   * will be aligned to the leading edge.
   * @public
   */
  align?: Api.GoogleActionsV2UiElementsTableCardColumnPropertiesHorizontalAlignment;
}

/** @public */
export interface TableRow {
  /**
   * Cells in this row.
   * The first 3 cells are guaranteed to be shown but others might be cut on certain surfaces.
   * Please test with the simulator to see which cells will be shown for a given surface.
   *
   * When provided as a string array, creates the cells as text.
   * @public
   */
  cells?: (Api.GoogleActionsV2UiElementsTableCardCell | string)[];
  /**
   * Indicates whether there should be a divider after each row.
   *
   * Overrides top level `dividers` property for this specific row if set.
   * @public
   */
  dividerAfter?: boolean;
}

/** @public */
export interface TableOptions {
  /**
   * Overall title of the table.
   *
   * Must be set if subtitle is set.
   * @public
   */
  title?: string;

  /**
   * Subtitle for the table.
   * @public
   */
  subtitle?: string;

  /**
   * Image associated with the table.
   * @public
   */
  image?: Api.GoogleActionsV2UiElementsImage;

  /**
   * Headers and alignment of columns with shortened name.
   * Alias of `columnProperties` with the additional capability of accepting a number type.
   *
   * This property or `columnProperties` is required.
   *
   * When provided as string array, just the header field is set per column.
   * When provided a number, it represents the number of elements per row.
   * @public
   */
  columns?: (TableColumn | string)[] | number;

  /**
   * Headers and alignment of columns.
   *
   * This property or `columns` is required.
   *
   * When provided as string array, just the header field is set per column.
   * @public
   */
  columnProperties?: (TableColumn | string)[];

  /**
   * Row data of the table.
   *
   * The first 3 rows are guaranteed to be shown but others might be cut on certain surfaces.
   * Please test with the simulator to see which rows will be shown for a given surface.
   *
   * On surfaces that support the WEB_BROWSER capability, you can point the user to
   * a web page with more data.
   * @public
   */
  rows: (TableRow | string[])[];

  /**
   * Default dividerAfter for all rows.
   * Individual rows with `dividerAfter` set will override for that specific row.
   * @public
   */
  dividers?: boolean;

  /**
   * Buttons for the Table.
   * Currently at most 1 button is supported.
   * @public
   */
  buttons?:
    | Api.GoogleActionsV2UiElementsButton
    | Api.GoogleActionsV2UiElementsButton[];
}

const toColumnProperties = (columns: (TableColumn | string)[]) =>
  columns.map(column =>
    typeof column === 'string'
      ? {
          header: column,
        }
      : ({
          header: column.header,
          horizontalAlignment: column.horizontalAlignment || column.align,
        } as Api.GoogleActionsV2UiElementsTableCardColumnProperties)
  );

/**
 * Creates a Table card.
 *
 * @example
 * ```javascript
 *
 * // Simple table
 * conv.ask('Simple Response')
 * conv.ask(new Table({
 *   dividers: true,
 *   columns: ['header 1', 'header 2', 'header 3'],
 *   rows: [
 *     ['row 1 item 1', 'row 1 item 2', 'row 1 item 3'],
 *     ['row 2 item 1', 'row 2 item 2', 'row 2 item 3'],
 *   ],
 * }))
 *
 * // All fields
 * conv.ask('Simple Response')
 * conv.ask(new Table({
 *   title: 'Table Title',
 *   subtitle: 'Table Subtitle',
 *   image: new Image({
 *     url: 'https://avatars0.githubusercontent.com/u/23533486',
 *     alt: 'Actions on Google'
 *   }),
 *   columns: [
 *     {
 *       header: 'header 1',
 *       align: 'CENTER',
 *     },
 *     {
 *       header: 'header 2',
 *       align: 'LEADING',
 *     },
 *     {
 *       header: 'header 3',
 *       align: 'TRAILING',
 *     },
 *   ],
 *   rows: [
 *     {
 *       cells: ['row 1 item 1', 'row 1 item 2', 'row 1 item 3'],
 *       dividerAfter: false,
 *     },
 *     {
 *       cells: ['row 2 item 1', 'row 2 item 2', 'row 2 item 3'],
 *       dividerAfter: true,
 *     },
 *     {
 *       cells: ['row 3 item 1', 'row 3 item 2', 'row 3 item 3'],
 *     },
 *   ],
 *   buttons: new Button({
 *     title: 'Button Title',
 *     url: 'https://github.com/actions-on-google'
 *   }),
 * }))
 * ```
 *
 * @public
 */
export interface Table extends Api.GoogleActionsV2UiElementsTableCard {}
export class Table implements Api.GoogleActionsV2UiElementsTableCard {
  /** @public */
  constructor(options: TableOptions) {
    this.title = options.title;
    this.subtitle = options.subtitle;
    this.image = options.image;
    this.rows = options.rows.map(row =>
      Array.isArray(row)
        ? ({
            cells: row.map(text => ({text})),
            dividerAfter: options.dividers,
          } as Api.GoogleActionsV2UiElementsTableCardRow)
        : ({
            cells: row.cells!.map(cell =>
              typeof cell === 'string' ? {text: cell} : cell
            ),
            dividerAfter:
              typeof row.dividerAfter === 'undefined'
                ? options.dividers
                : row.dividerAfter,
          } as Api.GoogleActionsV2UiElementsTableCardRow)
    );
    const {columnProperties, columns, buttons} = options;
    if (columnProperties) {
      this.columnProperties = toColumnProperties(columnProperties);
    }
    if (typeof columns !== 'undefined') {
      if (!this.columnProperties) {
        this.columnProperties = [];
      }
      const properties =
        typeof columns === 'number'
          ? new Array<Api.GoogleActionsV2UiElementsTableCardColumnProperties>(
              columns
            ).fill({})
          : toColumnProperties(columns);
      properties.forEach((v, i) => {
        if (!this.columnProperties![i]) {
          this.columnProperties![i] = properties[i];
        }
      });
    }
    if (buttons) {
      this.buttons = common.toArray(buttons);
    }
  }
}