<?php

namespace App\Services;

use App\Models\AppNotification;
use App\Models\AppNotificationRecipient;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

/**
 * اعلان تراکنشی داخل اپ برای یک مشتری — همان مسیر SSE اعلان ادمین (بدون OTP).
 */
class CustomerAppNotifyService
{
    public function __construct(
        private readonly ConfigService $config,
        private readonly PriceStreamService $stream,
    ) {
    }

    /**
     * خرید / فروش / واریز / برداشت — فقط وقتی اعلان داخل اپ روشن است.
     */
    public function notifyCustomer(
        int $customerId,
        string $title,
        string $body,
        string $severity = 'info'
    ): ?AppNotification {
        if ($customerId <= 0) {
            return null;
        }

        if (! $this->config->getBool('has_page_notification', true)) {
            return null;
        }

        $title = mb_substr(trim($title), 0, 191);
        $body = mb_substr(trim($body), 0, 5000);
        if ($title === '' || $body === '') {
            return null;
        }

        if (! in_array($severity, ['info', 'success', 'warning', 'danger'], true)) {
            $severity = 'info';
        }

        try {
            $payload = [
                'title' => $title,
                'body' => $body,
                'severity' => $severity,
                'is_active' => true,
                'created_by' => null,
                'audience_type' => AppNotificationAudienceService::TYPE_CUSTOMERS,
                'segment_keys' => null,
                'audience_label' => 'سیستمی — مشتری '.$customerId,
                'recipients_count' => 1,
            ];
            if (\Illuminate\Support\Facades\Schema::hasColumn('app_notifications', 'is_system')) {
                $payload['is_system'] = true;
            }

            $row = DB::transaction(function () use ($customerId, $payload) {
                $row = AppNotification::create($payload);

                AppNotificationRecipient::query()->insert([
                    'notification_id' => $row->id,
                    'customer_id' => $customerId,
                    'created_at' => now(),
                    'updated_at' => now(),
                ]);

                return $row;
            });

            $this->broadcastToCustomer($row, $customerId);

            return $row;
        } catch (\Throwable $e) {
            Log::warning('CustomerAppNotify failed', [
                'customer_id' => $customerId,
                'error' => $e->getMessage(),
            ]);

            return null;
        }
    }

    private function broadcastToCustomer(AppNotification $row, int $customerId): void
    {
        $unread = app(AppNotificationUnreadService::class);
        $payload = [
            'id' => $row->id,
            'title' => $row->title,
            'body' => $row->body,
            'severity' => $row->severity,
            'created_at' => optional($row->created_at)?->toIso8601String(),
            'unread_count' => $unread->countForCustomer($customerId),
        ];

        $this->stream->publishForCustomer($customerId, 'app_notification', $payload);
        $unread->publishForCustomer($customerId);
    }
}