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) return true;
    const { user } = context.switchToHttp().getRequest();
    // Support IAM roles array [{key, id}][] and legacy role string
    return requiredRoles.some(
      (role) => user?.roles?.some((r: { key: string }) => r.key === role) || user?.role === role,
    );
  }
}