import { ConnectionInformations, CreateUser, DatabaseInterface, Session } from '@accounts/types';
import { Repository, getRepository } from 'typeorm';
import { User } from '../entity/User';
import { UserEmail } from '../entity/UserEmail';
import { UserService } from '../entity/UserService';
import { UserSession } from '../entity/UserSession';

type ISession = Session & UserSession;

export class Typeorm implements DatabaseInterface {

  private userRepository: Repository<User>;
  private serviceRepository: Repository<UserService>;
  private emailRepository: Repository<UserEmail>;
  private sessionRepository: Repository<UserSession>;

  constructor() {
    this.userRepository = getRepository(User);
    this.serviceRepository = getRepository(UserService);
    this.emailRepository = getRepository(UserEmail);
    this.sessionRepository = getRepository(UserSession);
  }

  public async findUserByEmail(email: string): Promise<User | null> {
    return this.userRepository.findOne({
      where: { email },
    });
  }

  public async findUserByUsername(username: string): Promise<User | null> {
    return this.userRepository.findOne({
      where: { username },
    });
  }

  public async findUserById(userId: string): Promise<User | null> {
    const user = await this.userRepository.findOne(userId);
    if (!user) {
      throw new Error('User not found');
    }
    return user;
  }

  public async findUserByResetPasswordToken(token: string): Promise<User | null> {
    const service = await this.serviceRepository.findOne({
      where: {
        name: 'password.reset',
        token,
      },
    });
    return service.user;
  }

  public async findUserByEmailVerificationToken(token: string): Promise<User | null> {
    const service = await this.serviceRepository.findOne({
      where: {
        name: 'email.verification',
        token,
      },
    });
    return service.user;
  }

  public async createUser(createUser: CreateUser): Promise<string> {
    const { username, email, password } = createUser;

    const user = new User();

    if (email) {
      const userEmail = new UserEmail();
      userEmail.address = email;
      userEmail.verified = false;
      this.emailRepository.save(userEmail);
      user.emails = [userEmail];
    }

    if (password) {
      const userService = new UserService();
      userService.name = 'password';
      userService.options = { bcrypt: password };
      await this.serviceRepository.save(userService);
      user.services = [userService];
    }

    if (username) {
      user.username = username;
    }

    await this.userRepository.save(user);

    return user.id;
  }

  public async setUsername(userId: string, newUsername: string): Promise<void> {
    const user = await this.findUserById(userId);
    user.username = newUsername;
    await this.userRepository.save(user);
  }

  public async setProfile(userId: string, profile: object): Promise<object> {
    const user = await this.findUserById(userId);
    user.profile = profile;
    await this.userRepository.save(user);
    return profile;
  }

  public async findUserByServiceId(serviceName: string, serviceId: string): Promise<User | null> {
    const service = await this.serviceRepository.findOne({
      name: serviceName,
      id: serviceId,
    });

    if (service) {
      return service.user;
    }
  }

  public async setService(userId: string, serviceName: string, data: object): Promise<void> {
    const user = await this.findUserById(userId);
    const service = user.services.find((s) => s.name === serviceName);
    if (service) {
      service.options = data;
      await this.serviceRepository.save(service); // @todo is this needed?
      await this.userRepository.save(user);
    }
  }

  public async unsetService(userId: string, serviceName: string): Promise<void> {
    const user = await this.findUserById(userId);
    const service = user.services && user.services.find((s) => s.name === serviceName);
    if (service) {
      await this.serviceRepository.remove(service);
      await this.userRepository.save(user);
    }
  }

  public async findPasswordHash(userId: string): Promise<string | null> {
    const user = await this.findUserById(userId);
    const service = user.services && user.services.find((s) => s.name === 'password');
    return service.options && service.options.bcrypt;
    return null;
  }

  public async setPassword(userId: string, newPassword: string): Promise<void> {
    const user = await this.findUserById(userId);
    const service = user.services && user.services.find((s) => s.name === 'password');
    service.options = { bcrypt: newPassword };
    await this.serviceRepository.save(service);
    await this.userRepository.save(user);
  }

  public async addResetPasswordToken(userId: string, email: string, token: string, reason: string): Promise<void> {
    const user = await this.findUserById(userId);
    const service = new UserService();
    service.name = 'password.reset';
    service.token = token;
    service.options = {
      email: email.toLocaleLowerCase(),
      when: (new Date()).toJSON(),
      reason,
    };
    await this.serviceRepository.save(service);
    user.services.push(service);
    await this.userRepository.save(user);
  }

  public async setResetPassword(userId: string, email: string, newPassword: string, token: string): Promise<void> {
    await this.setPassword(userId, newPassword);
  }

  public async addEmail(userId: string, newEmail: string, verified: boolean): Promise<void> {
    const user = await this.findUserById(userId);
    const userEmail = new UserEmail();
    userEmail.address = newEmail;
    userEmail.verified = verified;
    user.emails.push(userEmail);
    await this.userRepository.save(user);
  }

  public async removeEmail(userId: string, email: string): Promise<void> {
    const user = await this.findUserById(userId);
    const userEmail = user.emails.find((s) => s.address === email);
    if (!userEmail) {
      throw new Error('Email not found');
    }
    await this.emailRepository.remove(userEmail);
  }

  public async verifyEmail(userId: string, email: string): Promise<void> {
    const user = await this.findUserById(userId);
    const userEmail = user.emails.find((s) => s.address === email);
    if (!userEmail) {
      throw new Error('Email not found');
    }
    userEmail.verified = true;
    await this.emailRepository.save(userEmail);
  }

  public async addEmailVerificationToken(userId: string, email: string, token: string): Promise<void> {
    const user = await this.findUserById(userId);
    const service = new UserService();
    service.token = token;
    service.name = 'email.verification';
    await this.serviceRepository.save(service);
    user.services.push(service);
    await this.userRepository.save(user);
  }

  public async setUserDeactivated(userId: string, deactivated: boolean): Promise<void> {
    const user = await this.findUserById(userId);
    user.deactivated = deactivated;
    await this.userRepository.save(user);
  }

  public findSessionById(sessionId: string): Promise<Session | null> {
    return this.sessionRepository.findOne(sessionId) as Promise<ISession>;
  }

  public findSessionByToken(token: string): Promise<ISession | null> {
    return this.sessionRepository.findOne({ token }) as Promise<ISession>;
  }

  public async createSession(
    userId: string,
    token: string,
    connection: ConnectionInformations,
    extra?: object,
    ): Promise<string> {
    const user = await this.findUserById(userId);
    const session = new UserSession();
    session.token = token;
    session.userAgent = connection.userAgent;
    session.ip = connection.ip;
    session.extra = extra;
    session.valid = true;
    await this.sessionRepository.save(session);

    user.sessions.push(session);
    await this.userRepository.save(user);

    return session.id;
  }

  public async updateSession(sessionId: string, connection: ConnectionInformations): Promise<void> {
    const session = await this.findSessionById(sessionId);
    session.userAgent = connection.userAgent;
    session.ip = connection.ip;
    await this.sessionRepository.save(session);
  }

  public async invalidateSession(sessionId: string): Promise<void> {
    const session = await this.findSessionById(sessionId);
    session.valid = false;
    await this.sessionRepository.save(session);
  }

  public async invalidateAllSessions(userId: string): Promise<void> {
    const user = await this.findUserById(userId);
    await Promise.all(
      user.sessions.map((session) =>
        this.sessionRepository.delete(session),
      ),
    );
  }
}