import { BadRequestException, Injectable, Logger } from "@nestjs/common";
import { DataSource } from "typeorm";

import { TokensService } from "./tokens.service";
import { AuthMessage, UserMessage } from "../../../common/enums/message.enum";
import { NotificationsService } from "../../notifications/providers/notifications.service";
import { RoleEnum } from "../../users/enums/role.enum";
import { UsersService } from "../../users/providers/users.service";
import { OTPService } from "../../utils/providers/otp.service";
import { PasswordService } from "../../utils/providers/password.service";
import { SmsService } from "../../utils/providers/sms.service";
import { CompleteRegistrationDto } from "../DTO/complete-register.dto";
import { CheckUserExistDto, LoginPasswordDTO } from "../DTO/loginPassword.dto";
import { RequestOtpDto } from "../DTO/request-otp.dto";
import { UpdatePasswordDto } from "../DTO/update-password.dto";
import { VerifyOtpDto } from "../DTO/verify-otp.dto";

@Injectable()
export class AuthService {
  private readonly logger = new Logger(AuthService.name);
  constructor(
    private readonly usersService: UsersService,
    private readonly passwordService: PasswordService,
    private readonly otpService: OTPService,
    private readonly tokensService: TokensService,
    private readonly dataSource: DataSource,
    private readonly notificationService: NotificationsService,
    private readonly smsService: SmsService,
  ) {}
  //****************** */
  //****************** */
  async initiateRegistration(requestOtpDto: RequestOtpDto) {
    const { phone } = requestOtpDto;
    const existUser = await this.usersService.findOneWithPhone(phone);
    if (existUser) throw new BadRequestException(AuthMessage.PHONE_EXISTS);

    const existCode = await this.otpService.checkExistOtp(phone, "REGISTER");
    if (existCode) {
      return {
        message: AuthMessage.OTP_ALREADY_SENT,
        ttlSecond: existCode,
      };
    }
    const otpCode = await this.otpService.generateAndSetInCache(phone, "REGISTER");
    //
    await this.smsService.sendSmsVerifyCode(phone, otpCode);
    this.logger.debug(`OTP sent to ${phone}: ${otpCode}`);

    return {
      message: AuthMessage.OTP_SENT,
      otpCode,
    };
  }
  //****************** */
  //****************** */
  async completeRegistration(completeRegistrationDto: CompleteRegistrationDto) {
    const { phone, code } = completeRegistrationDto;
    const queryRunner = this.dataSource.createQueryRunner();

    await queryRunner.connect();
    await queryRunner.startTransaction();
    try {
      const isValid = await this.otpService.verifyOtp(phone, code, "REGISTER");

      if (!isValid) throw new BadRequestException(AuthMessage.INVALID_OTP);

      await this.otpService.delOtpFormCache(phone, "REGISTER");
      const hashedPassword = await this.passwordService.hashPassword(completeRegistrationDto.password);
      const user = await this.usersService.createUser(completeRegistrationDto, hashedPassword, queryRunner);

      const tokens = this.tokensService.generateAccessAndRefreshToken({ sub: user.id, role: user.role.name });

      await queryRunner.commitTransaction();

      return {
        message: AuthMessage.USER_REGISTER_SUCCESS,
        ...tokens,
      };
    } catch (error) {
      await queryRunner.rollbackTransaction();
      throw error;
    } finally {
      await queryRunner.release();
    }
  }
  //****************** */
  //****************** */
  async loginWithPassword(loginDto: LoginPasswordDTO) {
    const { email, password } = loginDto;

    const user = await this.checkUserLoginCredentialWithEmail(email, password);

    const tokens = this.tokensService.generateAccessAndRefreshToken({ sub: user.id, role: user.role.name });

    await this.notificationService.createLoginNotification(user.id);

    return {
      message: AuthMessage.PASSWORD_LOGIN_SUCCESS,
      ...tokens,
    };
  }
  //****************** */
  //****************** */

  async adminLoginWithPassword(loginDto: LoginPasswordDTO) {
    const { email, password } = loginDto;

    const user = await this.checkUserLoginCredentialWithEmail(email, password);

    if (user.role.name !== RoleEnum.ADMIN) throw new BadRequestException(AuthMessage.NOT_ADMIN);
    const tokens = this.tokensService.generateAccessAndRefreshToken({ sub: user.id, role: user.role.name });

    return {
      message: AuthMessage.PASSWORD_LOGIN_SUCCESS,
      ...tokens,
    };
  }

  //****************** */
  //****************** */

  async checkUserExist(checkUserExistDto: CheckUserExistDto) {
    const user = await this.usersService.findOneWithEmail(checkUserExistDto.email);
    if (!user) throw new BadRequestException(UserMessage.USER_NOT_FOUND);
    return { message: UserMessage.USER_EXISTS };
  }

  //****************** */
  //****************** */

  async requestLoginOtp(requestOtpDto: RequestOtpDto, isAdmin: boolean = false) {
    const { phone } = requestOtpDto;
    const user = await this.usersService.findOneWithPhone(phone);
    if (!user) throw new BadRequestException(AuthMessage.PHONE_NOT_FOUND);

    //check the if the method call is from admin or not
    if (isAdmin && user.role.name !== RoleEnum.ADMIN) throw new BadRequestException(AuthMessage.NOT_ADMIN);

    const existCode = await this.otpService.checkExistOtp(phone, "LOGIN");
    if (existCode) {
      return {
        message: AuthMessage.OTP_ALREADY_SENT,
        ttlSecond: existCode,
      };
    }

    const otpCode = await this.otpService.generateAndSetInCache(phone, "LOGIN");
    //
    await this.smsService.sendSmsVerifyCode(phone, otpCode);
    this.logger.debug(`OTP sent to ${phone}: ${otpCode}`);

    return {
      message: AuthMessage.OTP_SENT,
      otpCode,
    };
  }

  //****************** */
  //****************** */

  async verifyLoginOtp(verifyOtpDto: VerifyOtpDto) {
    const { code, phone } = verifyOtpDto;

    const user = await this.checkUserLoginCredentialWithPhone(phone, code);

    const tokens = this.tokensService.generateAccessAndRefreshToken({ sub: user.id, role: user.role.name });

    await this.notificationService.createLoginNotification(user.id);
    return {
      message: AuthMessage.LOGIN_SUCCESS,
      ...tokens,
    };
  }

  //****************** */
  //****************** */

  async adminVerifyLoginOtp(verifyOtpDto: VerifyOtpDto) {
    const { code, phone } = verifyOtpDto;

    const user = await this.checkUserLoginCredentialWithPhone(phone, code);

    if (user.role.name !== RoleEnum.ADMIN) throw new BadRequestException(AuthMessage.NOT_ADMIN);

    const tokens = this.tokensService.generateAccessAndRefreshToken({ sub: user.id, role: user.role.name });
    return {
      message: AuthMessage.LOGIN_SUCCESS,
      ...tokens,
    };
  }
  //****************** */

  async updatePassword(userId: string, updateDto: UpdatePasswordDto) {
    const { user } = await this.usersService.findOneById(userId);

    const passCompare = await this.passwordService.comparePassword(updateDto.password, user.password);
    if (!passCompare) throw new BadRequestException(AuthMessage.INVALID_PASSWORD);

    if (updateDto.newPassword !== updateDto.repeatPassword) throw new BadRequestException(AuthMessage.INVALID_REAPET_PASSWORD);

    const hashedPassword = await this.passwordService.hashPassword(updateDto.newPassword);
    await this.usersService.updateUserPassword(user.id, hashedPassword);

    return {
      message: AuthMessage.PASSWORD_CHANGED_SUCCESSFULLY,
    };
  }

  //****************** */

  private async checkUserLoginCredentialWithEmail(email: string, password: string) {
    const user = await this.usersService.findOneWithEmail(email);
    if (!user) throw new BadRequestException(AuthMessage.INVALID_PASSWORD);

    const passCompare = await this.passwordService.comparePassword(password, user.password);
    if (!passCompare) throw new BadRequestException(AuthMessage.INVALID_PASSWORD);

    return user;
  }
  //****************** */
  //****************** */

  private async checkUserLoginCredentialWithPhone(phone: string, otpCode: string) {
    const isValid = await this.otpService.verifyOtp(phone, otpCode, "LOGIN");
    if (!isValid) throw new BadRequestException(AuthMessage.INVALID_OTP);

    await this.otpService.delOtpFormCache(phone, "LOGIN");

    const user = await this.usersService.findOneWithPhone(phone);
    if (!user) throw new BadRequestException(UserMessage.USER_NOT_FOUND);

    return user;
  }
}