/**
 * 中控 iframe 壳：顶栏/统计常驻，tab 内容走 /api/embed/page/<tab>。
 */
(function (global) {
  const TAB_PATH = {
    key_monitor: "/key_monitor",
    trade: "/trade",
    strategy: "/strategy",
    strategy_records: "/strategy/records",
    records: "/records",
    stats: "/stats",
  };

  let navToken = 0;
  let loadingTab = false;

  function isEmbedShell() {
    return document.body && document.body.getAttribute("data-embed-shell") === "1";
  }

  function getTab() {
    try {
      const t = new URLSearchParams(location.search).get("tab");
      if (t) return t;
    } catch (_) {}
    return document.body.getAttribute("data-page") || "trade";
  }

  function listWindowQueryString() {
    if (typeof global.listWindowQueryString === "function") {
      return global.listWindowQueryString();
    }
    return "";
  }

  function setRootLoading(on) {
    const root = document.getElementById("embed-page-root");
    if (root) root.classList.toggle("is-embed-tab-loading", !!on);
  }

  function setNavActive(tab) {
    document.querySelectorAll(".embed-top-nav [data-embed-tab]").forEach((a) => {
      a.classList.toggle("active", a.getAttribute("data-embed-tab") === tab);
    });
  }

  function syncUrl(tab, replace) {
    const q = new URLSearchParams(location.search);
    q.set("tab", tab);
    q.set("embed", "1");
    const qs = q.toString();
    const url = "/embed?" + qs;
    if (replace) history.replaceState({ embedTab: tab }, "", url);
    else history.pushState({ embedTab: tab }, "", url);
  }

  function runPageInit(tab) {
    document.body.setAttribute("data-page", tab);
    if (typeof global.attachListWindowToExports === "function") {
      global.attachListWindowToExports();
    }
    if (tab === "trade") {
      if (typeof global.refreshOrderDefaults === "function") global.refreshOrderDefaults();
    }
    if (tab === "key_monitor" && global.KeyMonitorForm && typeof global.KeyMonitorForm.init === "function") {
      global.KeyMonitorForm.init();
    }
    if (tab === "records") {
      if (typeof global.loadJournals === "function") global.loadJournals();
      if (typeof global.loadReviews === "function") global.loadReviews();
      if (typeof global.toggleReviewMode === "function") global.toggleReviewMode();
    }
    if (typeof global.refreshPriceSnapshotConditional === "function") {
      global.refreshPriceSnapshotConditional();
    }
  }

  function injectFragment(html) {
    const root = document.getElementById("embed-page-root");
    if (!root) return;
    root.innerHTML = html;
    root.querySelectorAll("script").forEach((old) => {
      const s = document.createElement("script");
      if (old.src) s.src = old.src;
      else s.textContent = old.textContent;
      old.replaceWith(s);
    });
  }

  async function loadTab(tab, opts) {
    const options = opts || {};
    if (!tab || loadingTab) return;
    const token = ++navToken;
    loadingTab = true;
    setRootLoading(true);
    try {
      const qs = listWindowQueryString();
      const url = "/api/embed/page/" + encodeURIComponent(tab) + (qs ? "?" + qs : "");
      const r = await fetch(url, { credentials: "same-origin" });
      if (token !== navToken) return;
      const j = await r.json();
      if (!j.ok || !j.html) throw new Error(j.msg || "加载失败");
      injectFragment(j.html);
      setNavActive(tab);
      if (!options.skipUrl) syncUrl(tab, !!options.replace);
      runPageInit(tab);
    } catch (e) {
      if (token === navToken) {
        const flash = document.getElementById("embed-flash");
        if (flash) {
          flash.style.display = "";
          flash.textContent = String(e && e.message ? e.message : e);
        }
      }
    } finally {
      if (token === navToken) {
        loadingTab = false;
        setRootLoading(false);
      }
    }
  }

  function reloadCurrentTab() {
    return loadTab(getTab(), { replace: true, skipUrl: true });
  }

  function patchApplyListWindow() {
    if (typeof global.applyListWindow !== "function") return;
    global.applyListWindow = function embedApplyListWindow() {
      void loadTab(getTab(), { replace: true });
    };
  }

  function patchHardNavigations() {
    const resubmitPaths =
      /^\/(del_|delete_|add_|stop_|strategy\/|trend_|roll_|cancel_|place_)/;

    document.addEventListener(
      "click",
      (ev) => {
        if (!isEmbedShell()) return;
        const a = ev.target.closest("a[href]");
        if (!a || ev.defaultPrevented) return;
        if (a.closest(".embed-top-nav")) return;
        if (a.hasAttribute("download") || a.target === "_blank") return;
        const raw = a.getAttribute("href");
        if (!raw || raw.startsWith("#") || raw.startsWith("javascript:")) return;
        let url;
        try {
          url = new URL(raw, location.href);
        } catch (_) {
          return;
        }
        if (url.origin !== location.origin) return;
        if (url.pathname.startsWith("/export/") || url.pathname.startsWith("/order_focus") || url.pathname.startsWith("/key_focus")) {
          return;
        }
        if (!resubmitPaths.test(url.pathname)) return;
        ev.preventDefault();
        fetch(url.pathname + url.search, { credentials: "same-origin", redirect: "manual" })
          .then(() => reloadCurrentTab())
          .catch(() => reloadCurrentTab());
      },
      false
    );

    document.addEventListener(
      "submit",
      (ev) => {
        if (!isEmbedShell()) return;
        const form = ev.target;
        if (!(form instanceof HTMLFormElement)) return;
        if (form.method && form.method.toUpperCase() === "GET") return;
        ev.preventDefault();
        const fd = new FormData(form);
        fetch(form.action, {
          method: form.method || "POST",
          body: fd,
          credentials: "same-origin",
          redirect: "manual",
        })
          .then(() => reloadCurrentTab())
          .catch(() => reloadCurrentTab());
      },
      true
    );
  }

  function bindNav() {
    document.querySelectorAll(".embed-top-nav [data-embed-tab]").forEach((a) => {
      a.addEventListener("click", (ev) => {
        ev.preventDefault();
        const tab = a.getAttribute("data-embed-tab");
        if (!tab || tab === getTab()) return;
        void loadTab(tab);
      });
    });
    window.addEventListener("popstate", () => {
      const tab = getTab();
      void loadTab(tab, { replace: true, skipUrl: true });
    });
  }

  function boot() {
    if (!isEmbedShell()) return;
    patchApplyListWindow();
    patchHardNavigations();
    bindNav();
    runPageInit(getTab());
    try {
      window.parent.postMessage({ type: "instance-frame-ready" }, "*");
    } catch (_) {}
  }

  global.InstanceEmbed = {
    loadTab,
    reloadCurrentTab,
    getTab,
  };

  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", boot);
  } else {
    boot();
  }
})(typeof window !== "undefined" ? window : globalThis);