import {
  CaptchaRequest,
  CaptchaResponse,
  CaptchaService,
} from "./captcha.types";
import { Inject, Logger } from "@nestjs/common";
import { HttpService } from "@nestjs/axios";
import { lastValueFrom } from "rxjs";
import { LOGGER } from "../../shared/modules/log/log.constants";
import { CacheService } from "../../shared/modules/cache/cache.types";
import { CaptchaConfig } from "../../../gen-src/captcha.config";

/**
 * The GoogleCaptchaService class extends the CaptchaService class with a specialization for Google reCAPTCHA.
 * It manages the generation and validation of Google reCAPTCHAs.
 */
export class GoogleCaptchaService extends CaptchaService<CaptchaResponse> {
  constructor(
    @Inject(LOGGER) private readonly logger: Logger,
    private readonly cacheService: CacheService,
    private readonly http: HttpService,
  ) {
    super();
  }

  /**
   * Generates a new Google reCAPTCHA and retrieves the public key defined in configuration.
   * @returns {Promise<CaptchaResponse>} - A promise resolving to a CaptchaResponse object containing the captcha id and type.
   */
  async generateCaptcha(): Promise<CaptchaResponse> {
    const captchaEnabled = await this.cacheService.getBoolean(
      CaptchaConfig.ENABLED,
    );
    if (!captchaEnabled) {
      return undefined;
    }
    const id = await this.cacheService.get(CaptchaConfig.GOOGLE_PUBLIC_KEY);
    return { id, type: "google" };
  }

  /**
   * Validates the provided captcha request against Google's reCAPTCHA verification service.
   * @param {CaptchaRequest} request - The captcha request to be validated.
   * @returns {Promise<boolean>} - A promise resolving to a boolean indicating whether the captcha is valid or not.
   */
  async validateCaptcha(request: CaptchaRequest): Promise<boolean> {
    const secretKey = await this.cacheService.get(
      CaptchaConfig.GOOGLE_SECRET_KEY,
    );
    const response$ = await this.http.post(
      `https://www.google.com/recaptcha/api/siteverify?secret=${secretKey}&response=${request.data}`,
    );
    const response = await lastValueFrom(response$);
    return response?.data?.success;
  }
}