// ModelRouter Desktop GUI — renderer
// Clash-Verge-style: the content area is a full-screen iframe loading the
// real WebUI 1:1 (status / chat / keys / priority / sources / adapters).
// The shell only adds the titlebar, settings overlay and tray integration.
const state = {
  core: {
    running: false,
    ready: false,
    baseUrl: "",
    port: 8787,
    profileDir: "",
    configFile: "",
    coreExists: true,
  },
  settings: {
    port: 8787,
    autoStart: true,
    silentStart: false,
    minimizeToTray: true,
  },
  theme: localStorage.getItem("mr-theme") || "light",
  loadedOnce: false, // iframe has been pointed at the web UI at least once
  frameLoaded: false, // last loadFrame actually finished loading (did-finish-load)
  loadTries: 0,
};

const $ = (s) => document.querySelector(s);

function toast(msg, isErr, ms) {
  const t = $("#toast");
  t.textContent = msg;
  t.className = "show" + (isErr ? " err" : "");
  clearTimeout(t._tm);
  t._tm = setTimeout(() => {
    t.className = "";
  }, ms || 2600);
}

const frame = () => $("#webui-frame");

// ===== core status =====
async function refreshCore() {
  state.core = await window.modelrouter.core.state();
  renderCoreStatus();
}

function renderCoreStatus() {
  const core = state.core;
  const dot = $("#conn-dot");
  dot.className = "status-dot" + (core.running ? " ok" : " bad");
  dot.title = !core.running
    ? "内核未运行"
    : core.ready
      ? "内核运行中"
      : "内核启动中…";
}

function showOffline() {
  frame().style.display = "none";
  $("#offline").style.display = "flex";
  $("#console-loading").style.display = "none";
}

function showLoading() {
  frame().style.display = "none";
  $("#offline").style.display = "none";
  $("#console-loading").style.display = "flex";
}

// probe the core's web root directly (fetch from the renderer). Using
// fetch() instead of relying on the iframe's own load means the core's
// readiness is confirmed by an actual HTTP round-trip before we point the
// iframe at it — this is what prevents the blank-screen race where the
// frame load happens while the listener is still coming up.
function coreReachable() {
  return fetch(
    state.core.baseUrl || "http://127.0.0.1:" + (state.core.port || 8787),
    { method: "GET", redirect: "follow", cache: "no-store" },
  )
    .then(() => true)
    .catch(() => false);
}

// point the iframe at the WebUI, but only after the core is reachable.
// If the load fails (core still booting / raced), we retry with backoff
// instead of giving up forever (the old code set loadedOnce blindly and
// never retried -> permanent blank screen).
let frameRetryTimer = null;
function scheduleFrameLoad() {
  if (frameRetryTimer) return; // already scheduled
  frameRetryTimer = setTimeout(async () => {
    frameRetryTimer = null;
    if (!state.core.running) return; // core stopped meanwhile
    if (!(await coreReachable())) {
      // core not reachable yet: wait a bit and try again
      state.loadTries += 1;
      showLoading();
      scheduleFrameLoad();
      return;
    }
    loadFrame(state.core.baseUrl || "http://127.0.0.1:" + state.core.port);
  }, state.loadTries === 0 ? 800 : Math.min(3000, 400 * state.loadTries));
}

function loadFrame(url) {
  const f = frame();
  f.style.display = "block";
  $("#offline").style.display = "none";
  $("#console-loading").style.display = "none";
  if (state.loadedOnce && f.src === url) return; // already pointing there
  f.src = url;
  state.loadedOnce = true;
}

async function ensureCore() {
  await refreshCore();
  if (state.core.running) {
    scheduleFrameLoad();
  } else {
    state.loadedOnce = false;
    showOffline();
  }
}

// ===== side rail toggles =====
function renderRail() {
  const auto = $("#rail-autostart-dot");
  const sil = $("#rail-silent-dot");
  if (auto) auto.classList.toggle("on", !!state.settings.autoStart);
  if (sil) sil.classList.toggle("on", !!state.settings.silentStart);
}

async function toggleAutoStart() {
  const next = !state.settings.autoStart;
  state.settings.autoStart = next;
  await window.modelrouter.settings.set({ autoStart: next });
  renderRail();
  toast(next ? "开机自启已开启" : "开机自启已关闭");
}

async function toggleSilent() {
  const next = !state.settings.silentStart;
  state.settings.silentStart = next;
  await window.modelrouter.settings.set({ silentStart: next });
  renderRail();
  toast(next ? "静默启动已开启" : "静默启动已关闭");
}

// ===== settings overlay =====
async function openSettings() {
  state.settings = await window.modelrouter.settings.get();
  $("#set-port").value = state.settings.port ?? 8787;
  $("#set-autostart").checked = !!state.settings.autoStart;
  $("#set-silent").checked = !!state.settings.silentStart;
  $("#set-tray").checked = !!state.settings.minimizeToTray;
  $("#settings-overlay").style.display = "flex";
  renderRail();
}
function closeSettings() {
  $("#settings-overlay").style.display = "none";
}

async function saveSettings() {
  const port = parseInt($("#set-port").value, 10);
  const autoStart = $("#set-autostart").checked;
  const silentStart = $("#set-silent").checked;
  const minimizeToTray = $("#set-tray").checked;
  await window.modelrouter.settings.set({
    port,
    autoStart,
    silentStart,
    minimizeToTray,
  });
  closeSettings();
  toast("设置已保存");
  await refreshCore();
  if (state.core.running) {
    scheduleFrameLoad();
  } else {
    state.loadedOnce = false;
    showOffline();
  }
}

// ===== theme =====
function applyTheme() {
  document.documentElement.dataset.theme = state.theme;
  try {
    localStorage.setItem("mr-theme", state.theme);
  } catch (e) {}
}

// ===== init =====
function init() {
  $("#tb-min").onclick = () => window.modelrouter.win.minimize();
  $("#tb-max").onclick = () => window.modelrouter.win.toggleMaximize();
  $("#tb-close").onclick = () => window.modelrouter.win.close();
  $("#tb-settings").onclick = openSettings;
  $("#rail-settings").onclick = openSettings;
  $("#rail-autostart").onclick = toggleAutoStart;
  $("#rail-silent").onclick = toggleSilent;
  $("#rail-theme").onclick = () => {
    state.theme = state.theme === "dark" ? "light" : "dark";
    applyTheme();
  };
  $("#set-close").onclick = closeSettings;
  $("#set-cancel").onclick = closeSettings;
  $("#set-save").onclick = saveSettings;
  $("#set-dir").onclick = () =>
    window.modelrouter.shell.openPath(state.core.profileDir);
  $("#set-log").onclick = async () => {
    const p = await window.modelrouter.settings.logFile();
    window.modelrouter.shell.openPath(p);
  };
  $("#off-start").onclick = async () => {
    showLoading();
    await window.modelrouter.core.start();
    await refreshCore();
    if (state.core.running) scheduleFrameLoad();
    else showOffline();
  };
  // when the iframe finishes loading, mark loaded and refresh core status so
  // the conn-dot reflects the actual WebUI (not just the core reachability)
  frame().onload = () => {
    state.frameLoaded = true;
    refreshCore();
  };
  // load failure (e.g. the frame was pointed at the core just before it
  // finished booting) -> clear loadedOnce and let scheduleFrameLoad retry
  frame().onerror = () => {
    state.loadedOnce = false;
    state.frameLoaded = false;
    scheduleFrameLoad();
  };
  window.modelrouter.core.onState((d) => {
    state.core = Object.assign({}, state.core, d);
    renderCoreStatus();
    if (d.running && !state.loadedOnce) scheduleFrameLoad();
    if (!d.running) {
      state.loadedOnce = false;
      showOffline();
    }
  });
  // Escape closes overlay
  document.addEventListener("keydown", (e) => {
    if (e.key === "Escape" && $("#settings-overlay").style.display === "flex")
      closeSettings();
  });
}

async function boot() {
  applyTheme();
  init();
  state.settings = await window.modelrouter.settings.get();
  renderRail();
  await ensureCore();
}

boot();