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

@Injectable()
export class RolesGuard implements CanActivate {
  constructor(private readonly 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 request = context.switchToHttp().getRequest();
    const user = request.user as JwtPayload;

    if (!user?.role) {
      return false;
    }

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