<?php
namespace App\Modules\Workshop;
use Illuminate\Support\Facades\{DB,Schema};
final class WorkshopCommercialState {
 public static function linked(string $area,int $id): bool {
  if(!Schema::hasTable('wb_generations'))return false;$column=$area==='service_drafts'?'service_draft_id':'billing_draft_id';
  if(DB::table('wb_generations')->where($column,$id)->exists())return true;
  if(!Schema::hasTable('wc_applications'))return false;
  return DB::table('wc_applications')->where($area==='service_drafts'?'new_service_id':'new_billing_id',$id)->exists();
 }
 public static function state(string $area,int $id): ?string {
  if(!self::linked($area,$id))return null;if(!Schema::hasTable('wc_applications'))return 'current';
  $event=DB::table('wc_applications')->where($area==='service_drafts'?'old_service_id':'old_billing_id',$id)->first();
  return $event?($event->kind==='replace'?'superseded':'cancelled'):'current';
 }
 public static function assertCurrent(string $area,int $id): void {
  $state=self::state($area,$id);abort_if($state!==null&&$state!=='current',409,'Preparação comercial substituída ou cancelada; apenas consulta histórica.');
 }
}