import { Result, UniqueID } from "@common/domain";
import { ITransactionManager } from "@common/infrastructure/database";
import jwt from "jsonwebtoken";
import {
  AuthenticatedUser,
  EmailAddress,
  HashPassword,
  IAuthenticatedUserRepository,
  PlainPassword,
  TabContext,
  Username,
} from "../domain";
import { ITabContextRepository } from "../domain/repositories/tab-context-repository.interface";
import { IAuthService } from "./auth-service.interface";

const SECRET_KEY = process.env.JWT_SECRET || "supersecretkey";
const ACCESS_EXPIRATION = process.env.JWT_ACCESS_EXPIRATION || "1h";
const REFRESH_EXPIRATION = process.env.JWT_REFRESH_EXPIRATION || "7d";

export class AuthService implements IAuthService {
  private readonly _userRepo!: IAuthenticatedUserRepository;
  private readonly _tabContactRepo!: ITabContextRepository;
  private readonly _transactionManager!: ITransactionManager;

  constructor(
    userRepo: IAuthenticatedUserRepository,
    tabContextRepo: ITabContextRepository,
    transactionManager: ITransactionManager
  ) {
    this._userRepo = userRepo;
    this._tabContactRepo = tabContextRepo;
    this._transactionManager = transactionManager;
  }

  generateAccessToken(payload: object): string {
    return jwt.sign(payload, SECRET_KEY, { expiresIn: ACCESS_EXPIRATION });
  }

  generateRefreshToken(payload: object): string {
    return jwt.sign(payload, SECRET_KEY, { expiresIn: REFRESH_EXPIRATION });
  }

  verifyToken(token: string): any {
    return jwt.verify(token, SECRET_KEY);
  }

  /**
   *
   * Registra un nuevo usuario en la base de datos bajo transacción.
   */
  async registerUser(params: {
    username: Username;
    email: EmailAddress;
    hashPassword: HashPassword;
  }): Promise<Result<AuthenticatedUser, Error>> {
    try {
      return await this._transactionManager.complete(async (transaction) => {
        const { username, email, hashPassword } = params;

        // Verificar si el usuario ya existe
        const userExists = await this._userRepo.userExists(email, transaction);
        if (userExists.isSuccess && userExists.data) {
          return Result.fail(new Error("Email is already registered"));
        }

        const newUserId = UniqueID.generateNewID().data;

        const userOrError = AuthenticatedUser.create(
          {
            username,
            email,
            hashPassword,
            roles: ["USER"],
          },
          newUserId
        );

        if (userOrError.isFailure) {
          return Result.fail(userOrError.error);
        }

        const createdResult = await this._userRepo.createUser(userOrError.data, transaction);

        if (createdResult.isFailure) {
          return Result.fail(createdResult.error);
        }

        return Result.ok(userOrError.data);
      });
    } catch (error: unknown) {
      return Result.fail(error as Error);
    }
  }

  /**
   *
   * Autentica a un usuario validando su email y contraseña.
   */
  async loginUser(params: {
    email: EmailAddress;
    plainPassword: HashPassword;
    tabId: UniqueID;
  }): Promise<
    Result<
      {
        user: AuthenticatedUser;
        tokens: {
          accessToken: string;
          refreshToken: string;
        };
      },
      Error
    >
  > {
    try {
      return await this._transactionManager.complete(async (transaction) => {
        const { email, plainPassword, tabId } = params;

        // Verificar que el tab ID está definido
        if (!tabId.isDefined()) {
          return Result.fail(new Error("Invalid tab id"));
        }

        // 🔹 Verificar si el usuario existe en la base de datos
        const userResult = await this._userRepo.getUserByEmail(email, transaction);
        if (userResult.isFailure) {
          return Result.fail(new Error("Invalid email or password"));
        }

        const user = userResult.data;

        // 🔹 Verificar que la contraseña sea correcta
        const isValidPassword = await user.verifyPassword(plainPassword);
        if (!isValidPassword) {
          return Result.fail(new Error("Invalid email or password"));
        }

        // Registrar o actualizar el contexto de ese tab ID
        const contextOrError = TabContext.create({
          userId: user.id,
          tabId: tabId,
        });

        if (contextOrError.isFailure) {
          return Result.fail(new Error("Error creating user context"));
        }

        await this._tabContactRepo.registerContextByTabId(contextOrError.data, transaction);

        // 🔹 Generar Access Token y Refresh Token
        const accessToken = this.generateAccessToken({
          userId: user.id.toString(),
          email: email.toString(),
          tabId: tabId.toString(),
          roles: ["USER"],
        });

        const refreshToken = this.generateRefreshToken({
          userId: user.id.toString(),
        });

        return Result.ok({
          user,
          tokens: {
            accessToken,
            refreshToken,
          },
        });
      });
    } catch (error: unknown) {
      return Result.fail(error as Error);
    }
  }

  /**
   *
   * Autentica a un usuario validando su email y contraseña.
   */
  async logoutUser(params: { email: EmailAddress; tabId: UniqueID }): Promise<Result<void, Error>> {
    try {
      return await this._transactionManager.complete(async (transaction) => {
        const { email, tabId } = params;

        // Verificar que el tab ID está definido
        if (!tabId.isDefined()) {
          return Result.fail(new Error("Invalid tab id"));
        }

        // 🔹 Verificar si el usuario existe en la base de datos
        const userResult = await this._userRepo.getUserByEmail(email, transaction);
        if (userResult.isFailure) {
          return Result.fail(new Error("Invalid email or password"));
        }

        const user = userResult.data;

        const contextOrError = TabContext.create({
          userId: user.id,
          tabId: tabId,
        });

        if (contextOrError.isFailure) {
          return Result.fail(new Error("Error creating user context"));
        }

        // Desregistrar el contexto de ese tab ID
        await this._tabContactRepo.unregisterContextByTabId(contextOrError.data, transaction);

        return Result.ok();
      });
    } catch (error: unknown) {
      return Result.fail(error as Error);
    }
  }

  async verifyUser(params: {
    email: EmailAddress;
    plainPassword: PlainPassword;
  }): Promise<Result<AuthenticatedUser, Error>> {
    try {
      return await this._transactionManager.complete(async (transaction) => {
        const { email, plainPassword } = params;
        const userResult = await this._userRepo.getUserByEmail(email, transaction);

        if (userResult.isFailure || !userResult.data) {
          return Result.fail(new Error("Invalid email or password"));
        }

        const user = userResult.data;
        const isValidPassword = await user.verifyPassword(plainPassword);

        if (!isValidPassword) {
          return Result.fail(new Error("Invalid email or password"));
        }

        return Result.ok(user);
      });
    } catch (error: unknown) {
      return Result.fail(error as Error);
    }
  }
}