<?php

namespace App\Services\MailFlow;

use App\Jobs\SendMailMessageJob;
use App\Models\MailMessage;
use App\Models\User;

class ExpiredSubscriptionNotifier
{
    public function queueDue(): int
    {
        $state = AutomaticMailPolicy::state();
        if (!$state || $state['level'] !== 2 || !$state['since'] || !admin_setting('remind_mail_enable', false)) { return 0; }
        $queued = 0;
        User::where('remind_expire', true)->where('banned', false)->whereNotNull('plan_id')
            ->where('expired_at', '>', $state['since'])->where('expired_at', '<=', now()->timestamp)
            ->chunkById(500, function ($users) use (&$queued) {
                foreach ($users as $user) {
                    if (!filter_var($user->email, FILTER_VALIDATE_EMAIL)) { continue; }
                    $key = 'subscription-expired:' . $user->id . ':' . $user->expired_at;
                    $params = ['message_key' => $key, 'email' => $user->email, 'user_id' => $user->id,
                        'purpose' => 'service_expired', 'subscription_expired_at' => (int) $user->expired_at,
                        'template_name' => 'serviceExpired', 'subject' => admin_setting('app_name', 'XBoard') . ' - 套餐已到期',
                        'template_value' => ['name' => admin_setting('app_name', 'XBoard'), 'url' => admin_setting('app_url')]];
                    if (AutomaticMailPolicy::decision('service_expired', $params)) { continue; }
                    // Persist before dispatch. The same user can renew and receive a later distinct expiry event.
                    $message = MailMessage::firstOrCreate(['message_key' => $key], [
                        'purpose' => 'service_expired', 'user_id' => $user->id, 'email' => $user->email,
                        'subject' => $params['subject'], 'template_name' => 'serviceExpired',
                        'expires_at' => now()->addDay(), 'payload' => ['email_params' => $params],
                    ]);
                    if (!$message->wasRecentlyCreated && ($message->status !== 'pending' || !$message->payload
                        || $message->updated_at->gt(now()->subMinutes(2)))) { continue; }
                    if ($message->attempts >= 6) {
                        $message->update(['status' => 'failed', 'error_code' => 'mail_retry_exhausted', 'payload' => null]);
                        continue;
                    }
                    $message->touch();
                    SendMailMessageJob::dispatch($message->id);
                    $queued++;
                }
            });
        return $queued;
    }
}