// 图片上传与短时签名 URL (与 server/routes/images.js 对应)
import { API_BASE } from "./config";
import { getToken } from "./index";

function base(p: string) {
  return API_BASE ? API_BASE + p : p;
}

function authHeaders(): Record<string, string> {
  const t = getToken();
  return t ? { Authorization: `Bearer ${t}` } : {};
}

async function request<T>(method: string, path: string, body?: unknown): Promise<T> {
  const headers: Record<string, string> = { "Content-Type": "application/json", ...authHeaders() };
  let res: Response;
  try {
    res = await fetch(base(path), { method, headers, body: body === undefined ? undefined : JSON.stringify(body) });
  } catch {
    throw new Error("网络错误，请检查网络连接");
  }
  let data: unknown = null;
  try {
    data = await res.json();
  } catch { /* no body */ }
  if (!res.ok) {
    const msg = (data as { error?: string } | null)?.error ?? `请求失败 (${res.status})`;
    if (res.status === 401) localStorage.removeItem("storage_user");
    throw new Error(msg);
  }
  return data as T;
}

// 上传: multipart/form-data, 返回暂存文件名 (挂到物品后由服务端归入家庭目录)
export async function uploadImage(file: File): Promise<string> {
  const fd = new FormData();
  fd.append("file", file);
  let res: Response;
  try {
    res = await fetch(base("/api/images"), { method: "POST", headers: authHeaders(), body: fd });
  } catch {
    throw new Error("网络错误，请检查网络连接");
  }
  let data: unknown = null;
  try {
    data = await res.json();
  } catch { /* no body */ }
  if (!res.ok) {
    const msg = (data as { error?: string } | null)?.error ?? `上传失败 (${res.status})`;
    throw new Error(msg);
  }
  return (data as { path: string }).path;
}

// 生成短时签名 URL (15 分钟), 供 <img> 直接使用
export function signImagePath(path: string) {
  return request<{ url: string }>("POST", "/api/images/sign", { path });
}

// 带鉴权的输入框支持 (web 浏览器限制多, 移动端/桌面经 Tauri shell 无缝)
export function imageAuthHeader(): Record<string, string> {
  const t = getToken();
  return t ? { Authorization: `Bearer ${t}` } : {};
}