<?php

namespace Modules\Maintenance\Services;

use App\Business;
use App\User;
use Illuminate\Support\Facades\Schema;
use Modules\Maintenance\Models\MaintenanceNotification;
use Modules\Maintenance\Models\PreventiveSchedule;
use Modules\Maintenance\Models\SparePart;

class MaintenanceNotificationService
{
    public function notify(
        Business $business,
        string $type,
        string $title,
        string $message,
        ?User $user = null,
        ?array $data = null
    ): ?MaintenanceNotification {
        if (! Schema::hasTable('maintenance_notifications')) {
            return null;
        }

        return MaintenanceNotification::create([
            'business_id' => $business->id,
            'user_id' => $user?->id,
            'type' => $type,
            'title' => $title,
            'message' => $message,
            'data' => $data,
            'channels' => ['in_app'],
            'scheduled_at' => now(),
            'sent_at' => now(),
        ]);
    }

    public function scanAndNotify(Business $business): array
    {
        $sent = [];

        if (Schema::hasTable('maintenance_preventive_schedules')) {
            $due = PreventiveSchedule::where('business_id', $business->id)
                ->where('is_active', true)
                ->where('next_due_at', '<=', now()->addDays(3))
                ->count();

            if ($due > 0) {
                $sent[] = $this->notify(
                    $business,
                    'pm_due',
                    'PM سررسید',
                    "{$due} برنامه PM در ۳ روز آینده سررسید دارد."
                );
            }
        }

        if (Schema::hasTable('maintenance_spare_parts')) {
            $low = SparePart::where('business_id', $business->id)
                ->whereColumn('quantity', '<=', 'min_stock')
                ->count();

            if ($low > 0) {
                $sent[] = $this->notify(
                    $business,
                    'low_stock',
                    'موجودی کم',
                    "{$low} قطعه یدکی زیر حداقل موجودی است."
                );
            }
        }

        return array_filter($sent);
    }
}