# All files / modules/auth/services auth.service.ts

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     import {
      Injectable,
      UnauthorizedException,
      ConflictException,
      BadRequestException,
      NotFoundException,
    } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository, DataSource } from 'typeorm';
    import { JwtService } from '@nestjs/jwt';
    import { ConfigService } from '@nestjs/config';
    import * as bcrypt from 'bcrypt';
    import * as crypto from 'crypto';
    import { User, Session, Token } from '../entities';
    import { RegisterDto, LoginDto, ChangePasswordDto } from '../dto';

    export interface AuthResponse {
      user: Partial<User>;
      accessToken: string;
      refreshToken: string;
    }

    export interface JwtPayload {
      sub: string;
      email: string;
      tenant_id: string;
    }

    @Injectable()
    export class AuthService {
      constructor(
        @InjectRepository(User)
        private readonly userRepository: Repository<User>,
        @InjectRepository(Session)
        private readonly sessionRepository: Repository<Session>,
        @InjectRepository(Token)
        private readonly tokenRepository: Repository<Token>,
        private readonly jwtService: JwtService,
        private readonly configService: ConfigService,
        private readonly dataSource: DataSource,
      ) {}

      /**
       * Register new user with tenant context
       */
      async register(
        dto: RegisterDto,
        tenantId: string,
        ip?: string,
        userAgent?: string,
      ): Promise<AuthResponse> {
        // Check if email already exists for this tenant
        const existing = await this.userRepository.findOne({
          where: { email: dto.email, tenant_id: tenantId },
        });

        if (existing) {
          throw new ConflictException('Email ya registrado en esta organización');
        }

        // Hash password
        const passwordHash = await bcrypt.hash(dto.password, 12);

        // Create user
        const user = this.userRepository.create({
          tenant_id: tenantId,
          email: dto.email,
          password_hash: passwordHash,
          first_name: dto.first_name || null,
          last_name: dto.last_name || null,
          phone: dto.phone || null,
          status: 'pending_verification',
          email_verified: false,
        });

        await this.userRepository.save(user);

        // Generate tokens
        const tokens = await this.generateTokens(user, ip, userAgent);

        // Create email verification token
        await this.createVerificationToken(user);

        return {
          user: this.sanitizeUser(user),
          ...tokens,
        };
      }

      /**
       * Login user
       */
      async login(
        dto: LoginDto,
        tenantId: string,
        ip?: string,
        userAgent?: string,
      ): Promise<AuthResponse> {
        // Find user
        const user = await this.userRepository.findOne({
          where: { email: dto.email, tenant_id: tenantId },
        });

        if (!user) {
          throw new UnauthorizedException('Credenciales inválidas');
        }

        // Validate password
        const isValid = await bcrypt.compare(dto.password, user.password_hash);
        if (!isValid) {
          throw new UnauthorizedException('Credenciales inválidas');
        }

        // Check user status
        if (user.status === 'suspended') {
          throw new UnauthorizedException('Cuenta suspendida');
        }

        if (user.status === 'inactive') {
          throw new UnauthorizedException('Cuenta inactiva');
        }

        // Update last login
        user.last_login_at = new Date();
        user.last_login_ip = ip || null;
        await this.userRepository.save(user);

        // Generate tokens
        const tokens = await this.generateTokens(user, ip, userAgent);

        return {
          user: this.sanitizeUser(user),
          ...tokens,
        };
      }

      /**
       * Logout user - invalidate session
       */
      async logout(userId: string, sessionToken: string): Promise<void> {
        await this.sessionRepository.update(
          { user_id: userId, session_token: sessionToken },
          { is_active: false },
        );
      }

      /**
       * Logout all sessions for user
       */
      async logoutAll(userId: string): Promise<void> {
        await this.sessionRepository.update(
          { user_id: userId },
          { is_active: false },
        );
      }

      /**
       * Refresh access token
       */
      async refreshToken(
        refreshToken: string,
        ip?: string,
        userAgent?: string,
      ): Promise<{ accessToken: string; refreshToken: string }> {
        try {
          // Verify refresh token
          const payload = this.jwtService.verify<JwtPayload>(refreshToken, {
            secret: this.configService.get<string>('jwt.secret'),
          });

          // Find user
          const user = await this.userRepository.findOne({
            where: { id: payload.sub },
          });

          if (!user) {
            throw new UnauthorizedException('Usuario no encontrado');
          }

          // Find session with this refresh token
          const refreshTokenHash = this.hashToken(refreshToken);
          const session = await this.sessionRepository.findOne({
            where: {
              user_id: user.id,
              refresh_token_hash: refreshTokenHash,
              is_active: true,
            },
          });

          if (!session) {
            throw new UnauthorizedException('Sesión inválida');
          }

          // Check if session expired
          if (new Date() > session.expires_at) {
            await this.sessionRepository.update({ id: session.id }, { is_active: false });
            throw new UnauthorizedException('Sesión expirada');
          }

          // Generate new tokens
          const tokens = await this.generateTokens(user, ip, userAgent, session.id);

          return tokens;
        } catch (error) {
          if (error instanceof UnauthorizedException) {
            throw error;
          }
          throw new UnauthorizedException('Token inválido');
        }
      }

      /**
       * Change password for authenticated user
       */
      async changePassword(
        userId: string,
        dto: ChangePasswordDto,
      ): Promise<{ message: string }> {
        const user = await this.userRepository.findOne({
          where: { id: userId },
        });

        if (!user) {
          throw new NotFoundException('Usuario no encontrado');
        }

        // Validate current password
        const isValid = await bcrypt.compare(dto.currentPassword, user.password_hash);
        if (!isValid) {
          throw new BadRequestException('Password actual incorrecto');
        }

        // Validate new password is different
        if (dto.currentPassword === dto.newPassword) {
          throw new BadRequestException('El nuevo password debe ser diferente al actual');
        }

        // Hash new password
        const newHash = await bcrypt.hash(dto.newPassword, 12);

        // Update password
        await this.userRepository.update({ id: userId }, { password_hash: newHash });

        // Optionally invalidate all sessions except current
        // await this.logoutAll(userId);

        return { message: 'Password actualizado correctamente' };
      }

      /**
       * Request password reset
       */
      async requestPasswordReset(email: string, tenantId: string): Promise<{ message: string }> {
        const user = await this.userRepository.findOne({
          where: { email, tenant_id: tenantId },
        });

        // Always return success to prevent email enumeration
        if (!user) {
          return { message: 'Si el email existe, recibirás instrucciones para restablecer tu password' };
        }

        // Create reset token
        const token = crypto.randomBytes(32).toString('hex');
        const tokenHash = this.hashToken(token);

        await this.tokenRepository.save({
          user_id: user.id,
          tenant_id: tenantId,
          token_type: 'password_reset',
          token_hash: tokenHash,
          expires_at: new Date(Date.now() + 60 * 60 * 1000), // 1 hour
        });

        // TODO: Send email with reset link containing token

        return { message: 'Si el email existe, recibirás instrucciones para restablecer tu password' };
      }

      /**
       * Reset password with token
       */
      async resetPassword(
        token: string,
        newPassword: string,
        tenantId: string,
      ): Promise<{ message: string }> {
        const tokenHash = this.hashToken(token);

        const tokenRecord = await this.tokenRepository.findOne({
          where: {
            token_hash: tokenHash,
            tenant_id: tenantId,
            token_type: 'password_reset',
            is_used: false,
          },
        });

        if (!tokenRecord) {
          throw new BadRequestException('Token inválido o expirado');
        }

        if (new Date() > tokenRecord.expires_at) {
          throw new BadRequestException('Token expirado');
        }

        // Hash new password
        const passwordHash = await bcrypt.hash(newPassword, 12);

        // Update password
        await this.userRepository.update(
          { id: tokenRecord.user_id },
          { password_hash: passwordHash },
        );

        // Mark token as used
        await this.tokenRepository.update(
          { id: tokenRecord.id },
          { is_used: true, used_at: new Date() },
        );

        // Invalidate all sessions
        await this.logoutAll(tokenRecord.user_id);

        return { message: 'Password restablecido correctamente' };
      }

      /**
       * Verify email with token
       */
      async verifyEmail(token: string, tenantId: string): Promise<{ message: string }> {
        const tokenHash = this.hashToken(token);

        const tokenRecord = await this.tokenRepository.findOne({
          where: {
            token_hash: tokenHash,
            tenant_id: tenantId,
            token_type: 'email_verification',
            is_used: false,
          },
        });

        if (!tokenRecord) {
          throw new BadRequestException('Token inválido o expirado');
        }

        if (new Date() > tokenRecord.expires_at) {
          throw new BadRequestException('Token expirado');
        }

        // Update user
        await this.userRepository.update(
          { id: tokenRecord.user_id },
          {
            email_verified: true,
            email_verified_at: new Date(),
            status: 'active',
          },
        );

        // Mark token as used
        await this.tokenRepository.update(
          { id: tokenRecord.id },
          { is_used: true, used_at: new Date() },
        );

        return { message: 'Email verificado correctamente' };
      }

      /**
       * Validate user by ID (for JWT strategy)
       */
      async validateUser(userId: string): Promise<User | null> {
        return this.userRepository.findOne({
          where: { id: userId, status: 'active' },
        });
      }

      /**
       * Get current user profile
       */
      async getProfile(userId: string): Promise<Partial<User>> {
        const user = await this.userRepository.findOne({
          where: { id: userId },
        });

        if (!user) {
          throw new NotFoundException('Usuario no encontrado');
        }

        return this.sanitizeUser(user);
      }

      // ==================== Private Methods ====================

      private async generateTokens(
        user: User,
        ip?: string,
        userAgent?: string,
        existingSessionId?: string,
      ): Promise<{ accessToken: string; refreshToken: string }> {
        const payload: JwtPayload = {
          sub: user.id,
          email: user.email,
          tenant_id: user.tenant_id,
        };

        const accessTokenExpiry = this.configService.get<string>('jwt.expiresIn') || '15m';
        const refreshTokenExpiry = this.configService.get<string>('jwt.refreshExpiresIn') || '7d';

        const accessToken = this.jwtService.sign(payload, {
          expiresIn: accessTokenExpiry as any,
        });

        const refreshToken = this.jwtService.sign(payload, {
          expiresIn: refreshTokenExpiry as any,
        });

        const sessionToken = crypto.randomBytes(32).toString('hex');
        const refreshTokenHash = this.hashToken(refreshToken);

        if (existingSessionId) {
          // Update existing session
          await this.sessionRepository.update(
            { id: existingSessionId },
            {
              refresh_token_hash: refreshTokenHash,
              last_activity_at: new Date(),
              expires_at: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
            },
          );
        } else {
          // Create new session
          await this.sessionRepository.save({
            user_id: user.id,
            tenant_id: user.tenant_id,
            session_token: sessionToken,
            refresh_token_hash: refreshTokenHash,
            ip_address: ip || null,
            user_agent: userAgent || null,
            device_type: this.detectDeviceType(userAgent),
            expires_at: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
            last_activity_at: new Date(),
            is_active: true,
          });
        }

        return { accessToken, refreshToken };
      }

      private async createVerificationToken(user: User): Promise<string> {
        const token = crypto.randomBytes(32).toString('hex');
        const tokenHash = this.hashToken(token);

        await this.tokenRepository.save({
          user_id: user.id,
          tenant_id: user.tenant_id,
          token_type: 'email_verification',
          token_hash: tokenHash,
          expires_at: new Date(Date.now() + 24 * 60 * 60 * 1000), // 24 hours
        });

        return token;
      }

      private hashToken(token: string): string {
        return crypto.createHash('sha256').update(token).digest('hex');
      }

      private sanitizeUser(user: User): Partial<User> {
        const { password_hash, ...sanitized } = user;
        return sanitized;
      }

      private detectDeviceType(userAgent?: string): string {
        if (!userAgent) return 'unknown';
        const ua = userAgent.toLowerCase();
        if (/mobile|android|iphone|ipod/.test(ua)) return 'mobile';
        if (/tablet|ipad/.test(ua)) return 'tablet';
        return 'desktop';
      }
    }