import { CanActivate, ExecutionContext, Injectable } from "@nestjs/common";
import { Reflector } from "@nestjs/core";
import { ROLES_KEY } from "./decorators";
import { type UserRole, type AuthenticatedRequest } from "@claw/shared-types";

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

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

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

    const request = context.switchToHttp().getRequest<AuthenticatedRequest>();
    const user = request.user;

    if (!user) {
      return false;
    }

    return requiredRoles.includes(user.role);
  }
}
