<?php

use MintyPHP\Http\SessionStoreInterface;
use MintyPHP\Router;
use MintyPHP\Service\Bookmark\BookmarkService;
use MintyPHP\Session;
use MintyPHP\Support\Guard;

Guard::requireLogin();

if (requestInput()->method() !== 'POST') {
    http_response_code(405);
    Router::json(['ok' => false, 'error' => 'method_not_allowed']);
    return;
}

if (!Session::checkCsrfToken()) {
    http_response_code(403);
    Router::json(['ok' => false, 'error' => 'csrf']);
    return;
}

$session = app(SessionStoreInterface::class)->all();
$userId = (int) ($session['user']['id'] ?? 0);
$type = trim((string) requestInput()->body('type'));
$allowedTypes = ['groups', 'bookmarks', 'root'];
if (!in_array($type, $allowedTypes, true)) {
    http_response_code(400);
    Router::json(['ok' => false, 'error' => 'invalid_type']);
    return;
}

$rawItems = requestInput()->body('items');
$items = is_array($rawItems) ? $rawItems : (is_string($rawItems) ? json_decode($rawItems, true) : []);

if (!is_array($items)) {
    http_response_code(400);
    Router::json(['ok' => false, 'error' => 'invalid_items']);
    return;
}

$service = app(BookmarkService::class);

if ($type === 'root') {
    $rootPairs = [];
    $seenRootIds = [];
    $seenSortOrders = [];

    foreach ($items as $item) {
        if (!is_array($item)) {
            continue;
        }
        $kind = trim((string) ($item['kind'] ?? ''));
        $id = (int) ($item['id'] ?? 0);
        $sortOrder = (int) ($item['sort_order'] ?? 0);
        if (($kind !== 'group' && $kind !== 'bookmark') || $id <= 0 || $sortOrder <= 0) {
            continue;
        }

        $dedupeKey = $kind . ':' . $id;
        if (isset($seenRootIds[$dedupeKey]) || isset($seenSortOrders[$sortOrder])) {
            http_response_code(400);
            Router::json(['ok' => false, 'error' => 'invalid_items']);
            return;
        }
        $seenRootIds[$dedupeKey] = true;
        $seenSortOrders[$sortOrder] = true;
        $rootPairs[] = [
            'kind' => $kind,
            'id' => $id,
            'sort_order' => $sortOrder,
        ];
    }

    $pairCount = count($rootPairs);
    if ($pairCount === 0 || $pairCount !== count($items)) {
        http_response_code(400);
        Router::json(['ok' => false, 'error' => 'invalid_items']);
        return;
    }

    $ok = $service->reorderRoot($userId, $rootPairs);
} else {
    $pairs = [];
    $seenIds = [];
    foreach ($items as $item) {
        if (!is_array($item)) {
            continue;
        }
        $id = (int) ($item['id'] ?? 0);
        $sortOrder = (int) ($item['sort_order'] ?? 0);
        if ($id > 0 && $sortOrder > 0) {
            if (isset($seenIds[$id])) {
                http_response_code(400);
                Router::json(['ok' => false, 'error' => 'invalid_items']);
                return;
            }
            $seenIds[$id] = true;
            $pairs[] = ['id' => $id, 'sort_order' => $sortOrder];
        }
    }

    $pairCount = count($pairs);
    if ($pairCount === 0 || $pairCount !== count($items)) {
        http_response_code(400);
        Router::json(['ok' => false, 'error' => 'invalid_items']);
        return;
    }

    $ok = $type === 'groups'
        ? $service->reorderGroups($userId, $pairs)
        : $service->reorderBookmarks($userId, $pairs);
}

if ($ok) {
    app(SessionStoreInterface::class)->set('user_bookmarks', $service->listGroupedForUser($userId));
    Router::json(['ok' => true]);
    return;
}

http_response_code(400);
Router::json(['ok' => false, 'error' => 'reorder_failed']);