<?php
require_once __DIR__ . '/../helpers.php';
runAuth();

/**
 * Menu CRUD API
 *
 * Actions: list, get, save, delete, reorder, setDefault
 * POST body: { "BusinessID": 37, "action": "list", ... }
 */

$data = readJsonBody();
$businessID = (int) ($data['BusinessID'] ?? 0);

if ($businessID === 0) {
    apiAbort(['OK' => false, 'ERROR' => 'missing_business_id', 'MESSAGE' => 'BusinessID is required']);
}

$action = strtolower($data['action'] ?? 'list');

try {
    switch ($action) {

        case 'list':
            $qMenus = queryTimed("
                SELECT ID, Name, Description, DaysActive, StartTime, EndTime, SortOrder, IsActive
                FROM Menus
                WHERE BusinessID = ? AND IsActive = 1
                ORDER BY SortOrder, Name
            ", [$businessID]);

            $menus = [];
            foreach ($qMenus as $m) {
                $catCount = queryOne("
                    SELECT COUNT(*) as cnt FROM Categories
                    WHERE BusinessID = ? AND MenuID = ?
                ", [$businessID, $m['ID']]);

                $menus[] = [
                    'MenuID'        => (int) $m['ID'],
                    'Name'          => $m['Name'],
                    'Description'   => $m['Description'] ?? '',
                    'DaysActive'    => (int) $m['DaysActive'],
                    'StartTime'     => !empty($m['StartTime']) ? (new DateTime($m['StartTime']))->format('H:i') : '',
                    'EndTime'       => !empty($m['EndTime']) ? (new DateTime($m['EndTime']))->format('H:i') : '',
                    'SortOrder'     => (int) $m['SortOrder'],
                    'CategoryCount' => (int) $catCount['cnt'],
                ];
            }

            jsonResponse(['OK' => true, 'MENUS' => $menus, 'COUNT' => count($menus)]);

        case 'get':
            $menuID = (int) ($data['MenuID'] ?? 0);
            if ($menuID === 0) {
                apiAbort(['OK' => false, 'ERROR' => 'missing_menu_id', 'MESSAGE' => 'MenuID is required']);
            }

            $menu = queryOne("SELECT * FROM Menus WHERE ID = ? AND BusinessID = ?", [$menuID, $businessID]);
            if (!$menu) {
                apiAbort(['OK' => false, 'ERROR' => 'menu_not_found', 'MESSAGE' => 'Menu not found']);
            }

            jsonResponse(['OK' => true, 'MENU' => [
                'MenuID'      => (int) $menu['ID'],
                'Name'        => $menu['Name'],
                'Description' => $menu['Description'] ?? '',
                'DaysActive'  => (int) $menu['DaysActive'],
                'StartTime'   => !empty($menu['StartTime']) ? (new DateTime($menu['StartTime']))->format('H:i') : '',
                'EndTime'     => !empty($menu['EndTime']) ? (new DateTime($menu['EndTime']))->format('H:i') : '',
                'SortOrder'   => (int) $menu['SortOrder'],
                'IsActive'    => (int) $menu['IsActive'],
            ]]);

        case 'save':
            $menuID          = (int) ($data['MenuID'] ?? 0);
            $menuName        = trim($data['Name'] ?? '');
            $menuDescription = trim($data['Description'] ?? '');
            $menuDaysActive  = (int) ($data['DaysActive'] ?? 127);
            $menuStartTime   = !empty($data['StartTime']) ? trim($data['StartTime']) : null;
            $menuEndTime     = !empty($data['EndTime']) ? trim($data['EndTime']) : null;
            $menuSortOrder   = (int) ($data['SortOrder'] ?? 0);

            if ($menuName === '') {
                apiAbort(['OK' => false, 'ERROR' => 'missing_menu_name', 'MESSAGE' => 'Menu name is required']);
            }

            if ($menuID > 0) {
                queryTimed("
                    UPDATE Menus SET
                        Name = ?, Description = ?, DaysActive = ?,
                        StartTime = ?, EndTime = ?, SortOrder = ?
                    WHERE ID = ? AND BusinessID = ?
                ", [$menuName, $menuDescription, $menuDaysActive, $menuStartTime, $menuEndTime, $menuSortOrder, $menuID, $businessID]);

                jsonResponse(['OK' => true, 'MenuID' => $menuID, 'ACTION' => 'updated']);
            } else {
                queryTimed("
                    INSERT INTO Menus (
                        BusinessID, Name, Description,
                        DaysActive, StartTime, EndTime,
                        SortOrder, IsActive, AddedOn
                    ) VALUES (?, ?, ?, ?, ?, ?, ?, 1, NOW())
                ", [$businessID, $menuName, $menuDescription, $menuDaysActive, $menuStartTime, $menuEndTime, $menuSortOrder]);

                $newID = (int) lastInsertId();
                jsonResponse(['OK' => true, 'MenuID' => $newID, 'ACTION' => 'created']);
            }

        case 'delete':
            $menuID = (int) ($data['MenuID'] ?? 0);
            if ($menuID === 0) {
                apiAbort(['OK' => false, 'ERROR' => 'missing_menu_id', 'MESSAGE' => 'MenuID is required']);
            }

            $catCheck = queryOne("
                SELECT COUNT(*) as cnt FROM Categories
                WHERE MenuID = ? AND BusinessID = ?
            ", [$menuID, $businessID]);

            if ((int) $catCheck['cnt'] > 0) {
                queryTimed("
                    UPDATE Categories SET MenuID = 0
                    WHERE MenuID = ? AND BusinessID = ?
                ", [$menuID, $businessID]);
            }

            queryTimed("
                UPDATE Menus SET IsActive = 0
                WHERE ID = ? AND BusinessID = ?
            ", [$menuID, $businessID]);

            jsonResponse([
                'OK'                    => true,
                'MenuID'                => $menuID,
                'ACTION'                => 'deleted',
                'CategoriesUnassigned'  => (int) $catCheck['cnt'],
            ]);

        case 'reorder':
            $menuOrder = $data['MenuOrder'] ?? [];
            if (!is_array($menuOrder) || count($menuOrder) === 0) {
                apiAbort(['OK' => false, 'ERROR' => 'missing_menu_order', 'MESSAGE' => 'MenuOrder array is required']);
            }

            foreach ($menuOrder as $i => $id) {
                queryTimed("
                    UPDATE Menus SET SortOrder = ?
                    WHERE ID = ? AND BusinessID = ?
                ", [$i, (int) $id, $businessID]);
            }

            jsonResponse(['OK' => true, 'ACTION' => 'reordered']);

        case 'setdefault':
            $menuID = (int) ($data['MenuID'] ?? 0);

            if ($menuID > 0) {
                $check = queryOne("
                    SELECT ID FROM Menus WHERE ID = ? AND BusinessID = ? AND IsActive = 1
                ", [$menuID, $businessID]);

                if (!$check) {
                    apiAbort(['OK' => false, 'ERROR' => 'invalid_menu', 'MESSAGE' => 'Menu not found or not active']);
                }
            }

            queryTimed("
                UPDATE Businesses SET DefaultMenuID = ?
                WHERE ID = ?
            ", [$menuID === 0 ? null : $menuID, $businessID]);

            jsonResponse(['OK' => true, 'ACTION' => 'defaultSet', 'DefaultMenuID' => $menuID]);

        default:
            apiAbort(['OK' => false, 'ERROR' => 'invalid_action', 'MESSAGE' => 'Unknown action: ' . $action]);
    }

} catch (Exception $e) {
    jsonResponse(['OK' => false, 'ERROR' => 'server_error', 'MESSAGE' => $e->getMessage(), 'DETAIL' => '']);
}