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

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

  canActivate(context: ExecutionContext): boolean {
    const requiredRoles = this.reflector.getAllAndOverride<string[]>(ROLES_KEY, [
      context.getHandler(),
      context.getClass(),
    ]);
    if (!requiredRoles?.length) return true;
    const { user } = context.switchToHttp().getRequest<{ user: JwtPayload & { role?: { name: string } } }>();
    if (!user?.role?.name) return false;
    return requiredRoles.includes(user.role.name);
  }
}