/* zikai 共享前端工具：toast、复制、字节/时间格式化、fetch 封装。
   Basic Auth 同源时浏览器自动带缓存的凭据，无需额外处理；fetch 默认 same-origin。 */
(function (global) {
  "use strict";

  // 布尔属性：用属性赋值而非 setAttribute（setAttribute("checked","false") 仍会勾选）
  const BOOL_PROPS = new Set([
    "checked", "disabled", "readonly", "selected", "hidden", "multiple", "open",
    "autofocus", "required", "async", "defer", "controls", "autoplay", "loop", "muted",
  ]);

  function el(tag, attrs, ...children) {
    const node = document.createElement(tag);
    if (attrs) {
      for (const [k, v] of Object.entries(attrs)) {
        if (k === "class") node.className = v;
        else if (k === "dataset") Object.assign(node.dataset, v);
        else if (k.startsWith("on") && typeof v === "function")
          node.addEventListener(k.slice(2).toLowerCase(), v);
        else if (BOOL_PROPS.has(k)) node[k] = !!v;
        else if (v !== null && v !== undefined && v !== false) node.setAttribute(k, v);
      }
    }
    for (const c of children) {
      if (c == null || c === false) continue;
      node.appendChild(typeof c === "string" ? document.createTextNode(c) : c);
    }
    return node;
  }

  let toastTimer = null;
  function toast(msg, kind) {
    let node = document.querySelector(".toast");
    if (!node) {
      node = el("div", { class: "toast" });
      document.body.appendChild(node);
    }
    node.textContent = msg;
    node.className = "toast show" + (kind ? " " + kind : "");
    clearTimeout(toastTimer);
    toastTimer = setTimeout(() => (node.className = "toast"), 2200);
  }

  async function copyText(text) {
    try {
      await navigator.clipboard.writeText(text);
      return true;
    } catch {
      // 降级：临时 textarea
      const ta = document.createElement("textarea");
      ta.value = text;
      ta.style.position = "fixed";
      ta.style.opacity = "0";
      document.body.appendChild(ta);
      ta.select();
      let ok = false;
      try { ok = document.execCommand("copy"); } catch {}
      document.body.removeChild(ta);
      return ok;
    }
  }

  function fmtBytes(n) {
    if (n == null) return "-";
    const x = Number(n);
    if (!isFinite(x)) return "-";
    for (const unit of ["B", "KiB", "MiB", "GiB", "TiB", "PiB"]) {
      if (Math.abs(x) < 1024 || unit === "PiB")
        return unit === "B" ? `${x} B` : `${x.toFixed(1)} ${unit}`;
      n = x / 1024;
    }
    return `${n.toFixed(1)} PiB`;
  }

  function fmtTime(s) {
    if (!s) return "-";
    const d = new Date(s);
    if (isNaN(d.getTime())) return s;
    const p = (n) => String(n).padStart(2, "0");
    return `${d.getFullYear()}-${p(d.getMonth() + 1)}-${p(d.getDate())} ${p(d.getHours())}:${p(d.getMinutes())}`;
  }

  async function api(path, opts) {
    const res = await fetch(path, opts);
    if (res.status === 401) {
      // 触发浏览器 Basic Auth 弹窗（同源 reload 即可带上凭据）
      toast("需要登录");
      throw new Error("UNAUTHORIZED");
    }
    return res;
  }

  global.ZK = { el, toast, copyText, fmtBytes, fmtTime, api };
})(window);