/** 基于当前页面 URL 解析 api 路径，适配根目录或子目录部署 */
function apiUrl(endpoint) {
  return new URL(`api/${endpoint}`, window.location.href).href;
}

/** 静态资源追加版本号，避免手机浏览器缓存旧 CSS/JS/图片 */
function assetUrl(path) {
  if (!path || /^https?:\/\//i.test(path)) return path;
  const v = window.__ASSET_V__ || "";
  if (!v) return path;
  const sep = path.includes("?") ? "&" : "?";
  return `${path}${sep}v=${encodeURIComponent(v)}`;
}

async function parseResponse(res) {
  const text = await res.text();
  if (!text) {
    return {};
  }
  try {
    return JSON.parse(text);
  } catch {
    const hint = res.status === 404
      ? "接口不存在，请确认 api 目录已上传"
      : res.status >= 500
        ? "服务器错误，请检查 PHP 与 data 目录写权限"
        : "服务器返回异常，请确认 PHP 已启用";
    throw new Error(`${hint}（HTTP ${res.status}）`);
  }
}

async function apiGet(endpoint, useCredentials = false) {
  const res = await fetch(apiUrl(endpoint), {
    credentials: useCredentials ? "include" : "same-origin",
  });
  const data = await parseResponse(res);
  if (!res.ok) {
    throw new Error(data.message || `请求失败（HTTP ${res.status}）`);
  }
  return data;
}

async function apiPost(endpoint, body, useCredentials = false, timeoutMs = 30000) {
  const controller = new AbortController();
  const timer = setTimeout(() => controller.abort(), timeoutMs);

  let res;
  try {
    res = await fetch(apiUrl(endpoint), {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(body),
      credentials: useCredentials ? "include" : "same-origin",
      signal: controller.signal,
    });
  } catch (e) {
    clearTimeout(timer);
    if (e.name === "AbortError") {
      throw new Error("请求超时，数据可能已保存，请稍后刷新或联系管理员");
    }
    throw new Error("网络请求失败，请检查网络或域名是否正确");
  }
  clearTimeout(timer);
  const data = await parseResponse(res);
  if (!res.ok) {
    throw new Error(data.message || `提交失败（HTTP ${res.status}）`);
  }
  return data;
}

function showToast(message, duration = 2500) {
  const existing = document.querySelector(".toast");
  if (existing) existing.remove();
  const el = document.createElement("div");
  el.className = "toast";
  el.textContent = message;
  document.body.appendChild(el);
  setTimeout(() => el.remove(), duration);
}

/** 供管理端下载使用 */
const API_BASE = (() => {
  const u = new URL("api/", window.location.href);
  return u.pathname.replace(/\/$/, "");
})();