import { Injectable, CanActivate, ExecutionContext } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { ROLES_KEY } from '../roles.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 || requiredRoles.length === 0) {
      return true;
    }
    const { user } = context.switchToHttp().getRequest();
    if (!user) return false;
    // user.roles should be populated after lookup; for now check if user has role names array
    const userRoles: string[] = (user.roles || []).map((r: any) => r.name || r);
    return requiredRoles.some(r => userRoles.includes(r));
  }
}