<?php

namespace App\Services;

use App\Mail\ServiceRenewedMail;
use App\Models\Invoice;
use App\Models\Notification;
use App\Models\Service;
use App\Models\Setting;
use App\Support\AutoEmailGate;
use Carbon\CarbonInterface;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;

class CustomerRenewalNotifier
{
    public const SCENARIO = 'admin_customer_service_renewed';

    public const SOURCE_CUSTOMER = 'customer';

    public const SOURCE_SYSTEM = 'system';

    public function notify(Service $service, Invoice $invoice, int $months, ?CarbonInterface $previousExpiresAt, string $source): void
    {
        $service->loadMissing(['customer', 'product']);
        $customer = $service->customer;
        if (! $customer) {
            return;
        }

        $productName = $service->product?->name ?? 'Dịch vụ';
        $serverName = (string) $service->server_name;
        $expiresAt = $service->expires_at?->format('d/m/Y') ?? 'N/A';
        $auto = $source === self::SOURCE_SYSTEM;
        $amount = number_format((float) $invoice->total, 0, ',', '.') . ' VNĐ';

        Notification::notifyAdmins([
            'type'  => 'service_renewed_by_customer',
            'title' => $auto ? 'Dịch vụ được tự động gia hạn' : 'Khách hàng gia hạn dịch vụ',
            'body'  => "{$customer->fullname} " . ($auto ? 'được tự động gia hạn' : 'đã gia hạn') . " {$productName}" . ($serverName !== '' ? " ({$serverName})" : '') . " thêm {$months} tháng ({$amount}), hạn mới {$expiresAt}.",
            'link'  => '/services/' . $service->id,
            'data'  => ['service_id' => $service->id, 'invoice_id' => $invoice->id, 'months' => $months],
        ]);

        app(ServiceRenewalNotifier::class)->notifyCustomerRenewal($service, $invoice, $months, $previousExpiresAt);

        $adminEmail = json_decode((string) Setting::where('key', 'setting')->value('value'), true)['admin_email'] ?? null;
        if (! $adminEmail || ! AutoEmailGate::allows(self::SCENARIO)) {
            return;
        }

        try {
            Mail::to($adminEmail)->queue(new ServiceRenewedMail(self::SCENARIO, [
                'customer_name'        => (string) $customer->fullname,
                'customer_email'       => (string) $customer->email,
                'product_name'         => $productName,
                'server_name_suffix'   => $serverName !== '' ? ' (' . e($serverName) . ')' : '',
                'months_label'         => "{$months} tháng",
                'old_expires_at'       => $previousExpiresAt?->format('d/m/Y') ?? 'N/A',
                'expires_at'           => $expiresAt,
                'invoice_number'       => (string) $invoice->invoice_number,
                'amount_formatted'     => $amount,
                'payment_method_label' => $invoice->payment_method === 'balance' ? 'Trừ số dư tài khoản' : (string) ($invoice->payment_method ?: 'N/A'),
                'renewal_source_label' => $auto ? 'Tự động gia hạn (hệ thống)' : 'Khách hàng tự gia hạn',
                'admin_url'            => rtrim(env('ADMIN_URL', config('app.url')), '/') . '/services/' . $service->id,
            ]));
        } catch (\Throwable $e) {
            Log::error('CustomerRenewalNotifier: không gửi được email admin', ['service_id' => $service->id, 'error' => $e->getMessage()]);
        }
    }
}