import {
  Injectable,
  CanActivate,
  ExecutionContext,
  ForbiddenException,
} from '@nestjs/common';
import { Reflector } from '@nestjs/core';

@Injectable()
export class RolesGuard implements CanActivate {
  constructor(private reflector: Reflector) {}

  canActivate(context: ExecutionContext): boolean {
    const requiredRoles = this.reflector.getAllAndOverride<string[]>('roles', [
      context.getHandler(),
      context.getClass(),
    ]);

    if (!requiredRoles) return true;

    const request = context.switchToHttp().getRequest();
    const { user } = request;

    if (!user) throw new ForbiddenException('User chưa đăng nhập');
    
    const userRole = user.role.map(item => item.id);

    const hasRole = requiredRoles.some((role) => userRole?.includes(role));
    
    if (!hasRole) {
      throw new ForbiddenException(
        `Bạn cần 1 trong các role: ${requiredRoles.join(', ')}`,
      );
    }

    return true;
  }
}