import { ExtractJwt, Strategy } from 'passport-jwt';
import { PassportStrategy } from '@nestjs/passport';
import { Injectable, UnauthorizedException } from '@nestjs/common';
import { UsersService } from '../users/users.service';
import { getJwtSecret } from './auth.constants';

export interface JwtPayload {
  sub: string;
  email?: string;
  role?: string;
  phoneNumber?: string;
}

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(private readonly usersService: UsersService) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: getJwtSecret(),
    });
  }

  async validate(payload: JwtPayload) {
    // Bypass DB lookup for local admin user to prevent UUID casting errors
    if (payload.sub === '12345678-1234-1234-1234-123456789012') {
      return { id: payload.sub, email: payload.email, role: payload.role };
    }

    const user = await this.usersService.findById(payload.sub);
    if (!user) {
      throw new UnauthorizedException('کاربر یافت نشد');
    }
    return user;
  }
}