<?php
/**
 * 编辑角色接口（含权限分配） POST /api/system/role_update.php
 * 入参：id / role_name / permissions（JSON数组）/ is_active
 */
require_once __DIR__ . '/../common/db.php';
require_once __DIR__ . '/../common/response.php';
require_once __DIR__ . '/../common/auth.php';
require_once __DIR__ . '/../common/logger.php';

checkAjax();
checkPermission('system');

$id = (int)($_POST['id'] ?? 0);
if ($id <= 0) {
    Response::error('参数错误', 400);
}

$pdo = DB::getInstance()->getPdo();
$check = $pdo->prepare("SELECT * FROM system_roles WHERE id = ?");
$check->execute([$id]);
$old = $check->fetch();
if (!$old) {
    Response::error('角色不存在');
}

// 超级管理员角色保护：不允许移除其自身
if ($id === 1) {
    Response::error('内置超级管理员角色不允许修改', 400);
}

$sets = [];
$params = [];

if (isset($_POST['role_name'])) {
    $roleName = trim($_POST['role_name']);
    if ($roleName === '') {
        Response::error('角色名称不能为空', 400);
    }
    $chk = $pdo->prepare("SELECT COUNT(*) FROM system_roles WHERE role_name = ? AND id <> ?");
    $chk->execute([$roleName, $id]);
    if ((int)$chk->fetchColumn() > 0) {
        Response::error('角色名称已存在');
    }
    $sets[] = 'role_name = ?';
    $params[] = $roleName;
}
if (isset($_POST['permissions'])) {
    $perms = json_decode($_POST['permissions'], true);
    if (!is_array($perms)) {
        Response::error('权限格式错误', 400);
    }
    $sets[] = 'permissions = ?';
    $params[] = json_encode(array_values($perms), JSON_UNESCAPED_UNICODE);
}
if (isset($_POST['is_active'])) {
    $sets[] = 'is_active = ?';
    $params[] = (int)$_POST['is_active'] ? 1 : 0;
}

if (!$sets) {
    Response::error('没有需要更新的字段', 400);
}

$params[] = $id;
$pdo->prepare("UPDATE system_roles SET " . implode(', ', $sets) . " WHERE id = ?")->execute($params);

logCurrent('update', 'system', 'system_roles', $id, ['before' => $old, 'after' => $sets]);
Response::success(null, '更新成功');