// Response interface
interface ApiResponse<T = any> {
  success: boolean,
  error: string,
  data: T,
}

export async function apiWrapper<T>(url: string, data: Record<string, any>): Promise<T | undefined> {
  try {
    // 自动编码为 key=value&key2=value2 格式
    const params = new URLSearchParams();
    Object.entries(data).forEach(([key, value]) => {
      params.append(key, String(value));
    });
    // 发起请求
    const response = await fetch(url, {
      method: "POST",
      mode: "cors",
      cache: "no-cache",
      credentials: "same-origin",
      headers: {
        // 明确指定内容类型
        'Content-Type': 'application/x-www-form-urlencoded',
      },
      redirect: "follow",
      referrerPolicy: "no-referrer",
      body: params.toString(),
    });

    // 检查 HTTP 状态码 (fetch 只有在网络故障时才会 reject，HTTP 404/500 不会)
    if (!response.ok) {
      console.error(`HTTP failed: ${response.status}`);
    }

    // 解析 JSON body
    // 注意：response.json() 返回的是一个 Promise，所以需要 await
    const payload = await response.json() as ApiResponse<T>;

    // 检查API返回结果
    if (payload.success) {
      return payload.data;
    } else {
      console.error(`API failed: ${payload.error}`);
      return undefined;
    }
  } catch (error) {
    // 统一错误处理
    console.error(`Fetch failed: ${error}`);
    return undefined;
  }
}

export async function boolApiWrapper<U>(url: string, data: Record<string, any>): Promise<boolean> {
  const rv = await apiWrapper<null>(url, data);
  return rv !== undefined;
}