<?php

declare(strict_types=1);

use App\App\Bootstrap;
use App\Security\Csrf;
use App\Security\FormAccess;
use App\Security\RateLimiter;
use App\Storage\FileSystem;
use App\Storage\JsonStore;

require dirname(__DIR__) . '/src/autoload.php';
Bootstrap::init();

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => Bootstrap::appMessage('common.method_not_allowed'),
    ], 405);
}

$csrf = $_POST['csrf'] ?? '';
if (!Csrf::validate(is_string($csrf) ? $csrf : null)) {
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => Bootstrap::appMessage('common.invalid_csrf'),
    ], 419);
}

if (trim((string) ($_POST['website'] ?? '')) !== '') {
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => Bootstrap::appMessage('common.request_blocked'),
    ], 400);
}

$email = strtolower(trim((string) ($_POST['email'] ?? '')));
if (filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => Bootstrap::appMessage('common.invalid_email'),
    ], 422);
}

$activityRaw = $_POST['last_user_activity_at'] ?? null;
$lastUserActivityAt = is_scalar($activityRaw) ? (int) $activityRaw : null;
$formAccess = new FormAccess();
$auth = $formAccess->assertVerifiedForEmail($email, $lastUserActivityAt);
if (($auth['ok'] ?? false) !== true) {
    $reason = (string) ($auth['reason'] ?? '');
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => (string) ($auth['message'] ?? 'Bitte E-Mail erneut verifizieren.'),
        'auth_required' => $reason === 'auth_required',
        'auth_expired' => $reason === 'auth_expired',
    ], (int) ($auth['status_code'] ?? 401));
}

$app = Bootstrap::config('app');
$limiter = new RateLimiter();
$ip = $_SERVER['REMOTE_ADDR'] ?? 'unknown';
$rateKey = sprintf('reset:%s:%s', $ip, $email);
if (!$limiter->allow($rateKey, (int) $app['rate_limit']['requests'], (int) $app['rate_limit']['window_seconds'])) {
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => Bootstrap::appMessage('reset.rate_limited'),
    ], 429);
}

$store = new JsonStore();

try {
    $result = $store->withEmailLock($email, static function () use ($store, $app, $email): array {
        $hadDraft = $store->getDraft($email) !== null;
        $submission = $store->getSubmissionByEmail($email);
        $hadSubmission = $submission !== null;

        if ($hadSubmission) {
            return [
                'ok' => false,
                'status' => 409,
                'message' => Bootstrap::appMessage('reset.already_submitted'),
                'had_draft' => $hadDraft,
                'had_submission' => true,
            ];
        }

        $store->deleteDraft($email);

        $uploadDir = rtrim((string) $app['storage']['uploads'], '/') . '/' . $store->emailKey($email);
        FileSystem::removeTree($uploadDir);

        return [
            'ok' => true,
            'status' => 200,
            'had_draft' => $hadDraft,
            'had_submission' => $hadSubmission,
        ];
    });
} catch (Throwable $e) {
    Bootstrap::log('app', 'reset error: ' . $e->getMessage());
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => Bootstrap::appMessage('reset.delete_error'),
    ], 500);
}

if (($result['ok'] ?? false) !== true) {
    Bootstrap::jsonResponse([
        'ok' => false,
        'message' => (string) ($result['message'] ?? Bootstrap::appMessage('reset.delete_error')),
        'had_draft' => (bool) ($result['had_draft'] ?? false),
        'had_submission' => (bool) ($result['had_submission'] ?? false),
    ], (int) ($result['status'] ?? 422));
}

Bootstrap::jsonResponse([
    'ok' => true,
    'message' => Bootstrap::appMessage('reset.success'),
    'had_draft' => (bool) ($result['had_draft'] ?? false),
    'had_submission' => (bool) ($result['had_submission'] ?? false),
]);