/**
 * @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 {coerceBooleanProperty} from '@angular/cdk/coercion';
import {
  ComponentHarness,
  ComponentHarnessConstructor,
  HarnessPredicate,
  TestElement,
} from '@angular/cdk/testing';
import {
  MatOptgroupHarness,
  MatOptionHarness,
  OptgroupHarnessFilters,
  OptionHarnessFilters,
} from '@angular/material/core/testing';
import {AutocompleteHarnessFilters} from './autocomplete-harness-filters';

export class MatAutocompleteHarness extends ComponentHarness {
  private _documentRootLocator = this.documentRootLocatorFactory();

  /** The selector for the host element of a `MatAutocomplete` instance. */
  static hostSelector = '.mat-mdc-autocomplete-trigger';

  /**
   * Gets a `HarnessPredicate` that can be used to search for an autocomplete with specific
   * attributes.
   * @param options Options for filtering which autocomplete instances are considered a match.
   * @return a `HarnessPredicate` configured with the given options.
   */
  static with<T extends MatAutocompleteHarness>(
    this: ComponentHarnessConstructor<T>,
    options: AutocompleteHarnessFilters = {},
  ): HarnessPredicate<T> {
    return new HarnessPredicate(this, options)
      .addOption('value', options.value, (harness, value) =>
        HarnessPredicate.stringMatches(harness.getValue(), value),
      )
      .addOption('disabled', options.disabled, async (harness, disabled) => {
        return (await harness.isDisabled()) === disabled;
      });
  }

  /** Gets the value of the autocomplete input. */
  async getValue(): Promise<string> {
    return (await this.host()).getProperty<string>('value');
  }

  /** Whether the autocomplete input is disabled. */
  async isDisabled(): Promise<boolean> {
    const disabled = (await this.host()).getAttribute('disabled');
    return coerceBooleanProperty(await disabled);
  }

  /** Focuses the autocomplete input. */
  async focus(): Promise<void> {
    return (await this.host()).focus();
  }

  /** Blurs the autocomplete input. */
  async blur(): Promise<void> {
    return (await this.host()).blur();
  }

  /** Whether the autocomplete input is focused. */
  async isFocused(): Promise<boolean> {
    return (await this.host()).isFocused();
  }

  /** Enters text into the autocomplete. */
  async enterText(value: string): Promise<void> {
    return (await this.host()).sendKeys(value);
  }

  /** Clears the input value. */
  async clear(): Promise<void> {
    return (await this.host()).clear();
  }

  /** Gets the options inside the autocomplete panel. */
  async getOptions(filters?: Omit<OptionHarnessFilters, 'ancestor'>): Promise<MatOptionHarness[]> {
    if (!(await this.isOpen())) {
      throw new Error('Unable to retrieve options for autocomplete. Autocomplete panel is closed.');
    }

    return this._documentRootLocator.locatorForAll(
      MatOptionHarness.with({
        ...(filters || {}),
        ancestor: await this._getPanelSelector(),
      } as OptionHarnessFilters),
    )();
  }

  /** Gets the option groups inside the autocomplete panel. */
  async getOptionGroups(
    filters?: Omit<OptgroupHarnessFilters, 'ancestor'>,
  ): Promise<MatOptgroupHarness[]> {
    if (!(await this.isOpen())) {
      throw new Error(
        'Unable to retrieve option groups for autocomplete. Autocomplete panel is closed.',
      );
    }

    return this._documentRootLocator.locatorForAll(
      MatOptgroupHarness.with({
        ...(filters || {}),
        ancestor: await this._getPanelSelector(),
      } as OptgroupHarnessFilters),
    )();
  }

  /** Selects the first option matching the given filters. */
  async selectOption(filters: OptionHarnessFilters): Promise<void> {
    await this.focus(); // Focus the input to make sure the autocomplete panel is shown.
    const options = await this.getOptions(filters);
    if (!options.length) {
      throw Error(`Could not find a mat-option matching ${JSON.stringify(filters)}`);
    }
    await options[0].click();
  }

  /** Whether the autocomplete is open. */
  async isOpen(): Promise<boolean> {
    const panel = await this._getPanel();
    return !!panel && (await panel.hasClass(`mat-mdc-autocomplete-visible`));
  }

  /** Gets the panel associated with this autocomplete trigger. */
  private async _getPanel(): Promise<TestElement | null> {
    // Technically this is static, but it needs to be in a
    // function, because the autocomplete's panel ID can changed.
    return this._documentRootLocator.locatorForOptional(await this._getPanelSelector())();
  }

  /** Gets the selector that can be used to find the autocomplete trigger's panel. */
  protected async _getPanelSelector(): Promise<string> {
    return `#${await (await this.host()).getAttribute('aria-controls')}`;
  }
}