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

import { UserRole } from '../../generated/prisma/enums';
import { AUTH_ROLES_KEY } from '../auth/auth.constants';

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

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

    if (!requiredRoles || requiredRoles.length === 0) {
      return true;
    }

    const request = context
      .switchToHttp()
      .getRequest<{ user?: { role?: UserRole } }>();
    const userRole = request.user?.role;

    if (!userRole || !requiredRoles.includes(userRole)) {
      throw new ForbiddenException(
        'You do not have permission to access this resource.',
      );
    }

    return true;
  }
}