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

/**
 * Save/Update Category
 *
 * POST body:
 * {
 *   "CategoryID": 123,            // Required for update
 *   "BusinessID": 37,             // Required for insert
 *   "Name": "Breakfast",
 *   "SortOrder": 1,
 *   "OrderTypes": "1,2,3",
 *   "ParentCategoryID": 0,
 *   "ScheduleStart": "06:00:00",
 *   "ScheduleEnd": "11:00:00",
 *   "ScheduleDays": "2,3,4,5,6"
 * }
 */

$data = readJsonBody();

$categoryID      = (int) ($data['CategoryID'] ?? 0);
$businessID      = (int) ($data['BusinessID'] ?? 0);
$name            = isset($data['Name']) ? substr(trim($data['Name']), 0, 30) : '';
$sortOrder       = (int) ($data['SortOrder'] ?? 0);
$orderTypes      = isset($data['OrderTypes']) ? trim($data['OrderTypes']) : '1,2,3';
$scheduleStart   = !empty($data['ScheduleStart']) ? trim($data['ScheduleStart']) : null;
$scheduleEnd     = !empty($data['ScheduleEnd']) ? trim($data['ScheduleEnd']) : null;
$scheduleDays    = !empty($data['ScheduleDays']) ? trim($data['ScheduleDays']) : null;
$parentCategoryID = (int) ($data['ParentCategoryID'] ?? 0);

try {
    // Enforce 2-level max: if the proposed parent is itself a subcategory, reject
    if ($parentCategoryID > 0) {
        $parent = queryOne("SELECT ParentCategoryID FROM Categories WHERE ID = ?", [$parentCategoryID]);
        if (!$parent) {
            jsonResponse(['OK' => false, 'ERROR' => 'invalid_parent', 'MESSAGE' => 'Parent category not found']);
        }
        if ((int) $parent['ParentCategoryID'] > 0) {
            jsonResponse(['OK' => false, 'ERROR' => 'nesting_too_deep', 'MESSAGE' => 'Subcategories cannot have their own subcategories (max 2 levels)']);
        }
    }

    if ($categoryID > 0) {
        // Update existing category
        queryTimed("
            UPDATE Categories SET
                Name = ?,
                SortOrder = ?,
                OrderTypes = ?,
                ParentCategoryID = ?,
                ScheduleStart = ?,
                ScheduleEnd = ?,
                ScheduleDays = ?
            WHERE ID = ?
        ", [$name, $sortOrder, $orderTypes, $parentCategoryID, $scheduleStart, $scheduleEnd, $scheduleDays, $categoryID]);

        jsonResponse(['OK' => true, 'CategoryID' => $categoryID, 'MESSAGE' => 'Category updated']);

    } elseif ($businessID > 0 && strlen($name) > 0) {
        // Insert new category
        queryTimed("
            INSERT INTO Categories
            (BusinessID, Name, SortOrder, OrderTypes, ParentCategoryID,
             ScheduleStart, ScheduleEnd, ScheduleDays, AddedOn)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, NOW())
        ", [$businessID, $name, $sortOrder, $orderTypes, $parentCategoryID, $scheduleStart, $scheduleEnd, $scheduleDays]);

        $newId = lastInsertId();
        jsonResponse(['OK' => true, 'CategoryID' => (int) $newId, 'MESSAGE' => 'Category created']);

    } else {
        jsonResponse(['OK' => false, 'ERROR' => 'invalid_params', 'MESSAGE' => 'CategoryID required for update, or BusinessID and Name for insert']);
    }

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