<?php

namespace App\Services;

use App\Mail\ServiceRenewalReminderMail;
use App\Models\Mail as MailLog;
use App\Models\Service;
use App\Models\User;
use App\Services\Email\EmailTemplateService;
use App\Support\AutoEmailGate;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Support\Facades\Mail;

class ServiceRenewalReminderService
{
    private const SCENARIO = 'service_renewal_reminder';

    public const MAX_RESULTS = 1000;

    public function __construct(private readonly EmailTemplateService $templates) {}

    /**
     * @return Collection<int, Service>
     */
    public function expiring(int $days): Collection
    {
        return Service::with(['customer:id,uuid,fullname,email', 'product:id,name'])
            ->where('status', 'active')
            ->where('cancel_at_expiry', false)
            ->whereHas('customer')
            ->whereBetween('expires_at', [now()->startOfDay(), now()->addDays($days)->endOfDay()])
            ->orderBy('expires_at')
            ->limit(self::MAX_RESULTS)
            ->get();
    }

    public function daysLeft(Service $service): int
    {
        return (int) now()->startOfDay()->diffInDays($service->expires_at->copy()->startOfDay(), false);
    }

    /**
     * @param array<int, int> $serviceIds
     */
    public function send(array $serviceIds, User $admin): int
    {
        abort_if(!AutoEmailGate::mailEnabled(), 422, 'Hệ thống đang tắt gửi email (Mẫu email → Cài đặt → Bật gửi email).');

        try {
            $template = $this->templates->loadTemplate(self::SCENARIO);
        } catch (ModelNotFoundException) {
            abort(422, 'Chưa có template nhắc gia hạn (service_renewal_reminder) đang bật trong Mẫu email.');
        }

        AutoEmailGate::markManual();

        $services = Service::with(['customer', 'product', 'orderItem'])
            ->whereIn('id', $serviceIds)
            ->whereNotNull('expires_at')
            ->get()
            ->filter(fn (Service $service) => filled($service->customer?->email));

        foreach ($services as $service) {
            $mail = new ServiceRenewalReminderMail($service->customer, $service);

            MailLog::create([
                'template_id' => $template->id,
                'subject' => $mail->envelope()->subject,
                'from_address' => $template->mailConfig()['from_email'] ?? config('mail.from.address'),
                'to' => $service->customer->email,
                'customer_id' => $service->customer_id,
                'sent_by' => $admin->id,
                'message' => $mail->render(),
            ]);

            Mail::to($service->customer->email)->queue($mail);
        }

        return $services->count();
    }
}