roles.guard.ts

import { Injectable, CanActivate, ExecutionContext, ForbiddenException } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { ROLES_KEY } from '../decorators/roles.decorator';

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

  canActivate(context: ExecutionContext): boolean {
    const requiredRoles = this.reflector.get<string[]>(
      ROLES_KEY,
      context.getHandler(),
    );

    if (!requiredRoles) {
      return true;
    }

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

    if (!user) {
      throw new ForbiddenException('User not authenticated');
    }

    const hasRole = requiredRoles.some((role) => user.roles?.includes(role));

    if (!hasRole) {
      throw new ForbiddenException('Insufficient permissions');
    }

    return true;
  }
}