/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */

import {
  ComponentHarnessConstructor,
  ContentContainerComponentHarness,
  HarnessPredicate,
  parallel,
} from '@angular/cdk/testing';
import {
  MatFooterRowHarness,
  MatHeaderRowHarness,
  MatRowHarness,
  MatRowHarnessColumnsText,
} from './row-harness';
import {RowHarnessFilters, TableHarnessFilters} from './table-harness-filters';

/** Text extracted from a table organized by columns. */
export interface MatTableHarnessColumnsText {
  [columnName: string]: {
    text: string[];
    headerText: string[];
    footerText: string[];
  };
}

/** Harness for interacting with a mat-table in tests. */
export class MatTableHarness extends ContentContainerComponentHarness<string> {
  /** The selector for the host element of a `MatTableHarness` instance. */
  static hostSelector = '.mat-mdc-table';
  _headerRowHarness = MatHeaderRowHarness;
  _rowHarness = MatRowHarness;
  private _footerRowHarness = MatFooterRowHarness;

  /**
   * Gets a `HarnessPredicate` that can be used to search for a table with specific attributes.
   * @param options Options for narrowing the search
   * @return a `HarnessPredicate` configured with the given options.
   */
  static with<T extends MatTableHarness>(
    this: ComponentHarnessConstructor<T>,
    options: TableHarnessFilters = {},
  ): HarnessPredicate<T> {
    return new HarnessPredicate(this, options);
  }

  /** Gets all the header rows in a table. */
  async getHeaderRows(filter: RowHarnessFilters = {}): Promise<MatHeaderRowHarness[]> {
    return this.locatorForAll(this._headerRowHarness.with(filter))();
  }

  /** Gets all the regular data rows in a table. */
  async getRows(filter: RowHarnessFilters = {}): Promise<MatRowHarness[]> {
    return this.locatorForAll(this._rowHarness.with(filter))();
  }

  /** Gets all the footer rows in a table. */
  async getFooterRows(filter: RowHarnessFilters = {}): Promise<MatFooterRowHarness[]> {
    return this.locatorForAll(this._footerRowHarness.with(filter))();
  }

  /** Gets the text inside the entire table organized by rows. */
  async getCellTextByIndex(): Promise<string[][]> {
    const rows = await this.getRows();
    return parallel(() => rows.map(row => row.getCellTextByIndex()));
  }

  /** Gets the text inside the entire table organized by columns. */
  async getCellTextByColumnName(): Promise<MatTableHarnessColumnsText> {
    const [headerRows, footerRows, dataRows] = await parallel(() => [
      this.getHeaderRows(),
      this.getFooterRows(),
      this.getRows(),
    ]);

    const text: MatTableHarnessColumnsText = {};
    const [headerData, footerData, rowsData] = await parallel(() => [
      parallel(() => headerRows.map(row => row.getCellTextByColumnName())),
      parallel(() => footerRows.map(row => row.getCellTextByColumnName())),
      parallel(() => dataRows.map(row => row.getCellTextByColumnName())),
    ]);

    rowsData.forEach(data => {
      Object.keys(data).forEach(columnName => {
        const cellText = data[columnName];

        if (!text[columnName]) {
          text[columnName] = {
            headerText: getCellTextsByColumn(headerData, columnName),
            footerText: getCellTextsByColumn(footerData, columnName),
            text: [],
          };
        }

        text[columnName].text.push(cellText);
      });
    });

    return text;
  }
}

/** Extracts the text of cells only under a particular column. */
function getCellTextsByColumn(rowsData: MatRowHarnessColumnsText[], column: string): string[] {
  const columnTexts: string[] = [];

  rowsData.forEach(data => {
    Object.keys(data).forEach(columnName => {
      if (columnName === column) {
        columnTexts.push(data[columnName]);
      }
    });
  });

  return columnTexts;
}