/**
 * Copyright 2023 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 {
  type Observable,
  defer,
  from,
  throwIfEmpty,
} from '../../../third_party/rxjs/rxjs.js';
import type {Awaitable, HandleFor} from '../../common/types.js';
import type {Frame} from '../Frame.js';
import type {Page} from '../Page.js';

import {type ActionOptions, Locator} from './locators.js';

/**
 * @internal
 */
export class FunctionLocator<T> extends Locator<T> {
  static create<Ret>(
    pageOrFrame: Page | Frame,
    func: () => Awaitable<Ret>
  ): Locator<Ret> {
    return new FunctionLocator<Ret>(pageOrFrame, func).setTimeout(
      'getDefaultTimeout' in pageOrFrame
        ? pageOrFrame.getDefaultTimeout()
        : pageOrFrame.page().getDefaultTimeout()
    );
  }

  #pageOrFrame: Page | Frame;
  #func: () => Awaitable<T>;

  private constructor(pageOrFrame: Page | Frame, func: () => Awaitable<T>) {
    super();

    this.#pageOrFrame = pageOrFrame;
    this.#func = func;
  }

  override _clone(): FunctionLocator<T> {
    return new FunctionLocator(this.#pageOrFrame, this.#func);
  }

  _wait(options?: Readonly<ActionOptions>): Observable<HandleFor<T>> {
    const signal = options?.signal;
    return defer(() => {
      return from(
        this.#pageOrFrame.waitForFunction(this.#func, {
          timeout: this.timeout,
          signal,
        })
      );
    }).pipe(throwIfEmpty());
  }
}