import { ExecutionContext, Injectable, UnauthorizedException } from '@nestjs/common';
import { AuthGuard } from '@nestjs/passport';
import { JWT_ACCESS_STRATEGY } from '../constants/auth.constants';

/**
 * Protects routes with Passport JWT access strategy.
 */
@Injectable()
export class JwtAuthGuard extends AuthGuard(JWT_ACCESS_STRATEGY) {
  override handleRequest<TUser>(
    err: Error | null,
    user: TUser | false,
    _info: unknown,
    _context: ExecutionContext,
  ): TUser {
    if (err || !user) {
      throw err ?? new UnauthorizedException('Unauthorized');
    }
    return user;
  }
}