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

// Promise-based sendMessage with timeout (MV3 reliable)
function sendMsg(msg, timeoutMs = 10000) {
  return new Promise((resolve) => {
    let settled = false;
    const timer = setTimeout(() => {
      if (!settled) {
        settled = true;
        resolve({ error: "消息超时，请检查插件是否正常加载" });
      }
    }, timeoutMs);

    chrome.runtime.sendMessage(msg, (res) => {
      if (settled) return;
      settled = true;
      clearTimeout(timer);
      if (chrome.runtime.lastError) {
        resolve({ error: chrome.runtime.lastError.message });
      } else {
        resolve(res || { error: "无响应" });
      }
    });
  });
}

function setUI(state) {
  const dot = $("#statusDot");
  const text = $("#statusText");
  const btn = $("#btnToggle");

  if (state === "loading") {
    dot.className = "dot dot-gray";
    text.textContent = "连接中...";
    btn.textContent = "启动";
    btn.className = "btn btn-primary";
    btn.disabled = true;
  } else if (state === "error") {
    dot.className = "dot dot-red";
    text.textContent = "服务未连接";
    btn.textContent = "启动";
    btn.className = "btn btn-primary";
    btn.disabled = true;
    $("#statToday").textContent = "-";
    $("#statPending").textContent = "-";
    $("#statFails").textContent = "-";
    $("#todayCount").textContent = "- / -";
    $("#connTest").innerHTML = '<span class="fail">无法连接到后台脚本，请右键插件→重新加载</span>';
  } else if (state === "running") {
    dot.className = "dot dot-green";
    text.textContent = "运行中";
    btn.textContent = "停止";
    btn.className = "btn btn-danger";
    btn.disabled = false;
  } else if (state === "stopped") {
    dot.className = "dot dot-gray";
    text.textContent = "已停止";
    btn.textContent = "启动";
    btn.className = "btn btn-primary";
    btn.disabled = false;
  }
}

async function loadStatus() {
  setUI("loading");

  const status = await sendMsg({ type: "GET_STATUS" });

  if (!status || status.error) {
    setUI("error");
    return;
  }

  setUI(status.polling ? "running" : "stopped");

  if (status.statusError) {
    $("#connTest").innerHTML = `<span class="fail">${status.statusError}</span>`;
  } else {
    $("#connTest").innerHTML = "";
  }

  $("#statToday").textContent = status.todayCount;
  $("#statFails").textContent = status.consecutiveFailures;

  const config = await sendMsg({ type: "GET_CONFIG" });
  if (config && !config.error) {
    $("#shopId").value = config.shopId || "";
    $("#serverUrl").value = config.serverUrl || "http://localhost:3000";
    const limit = config.dailyLimit || 20;
    const pending = status.pendingCount || 0;
    $("#statPending").textContent = pending;
    $("#todayCount").textContent = `${status.todayCount} / ${limit}`;
  }
}

$("#btnToggle").addEventListener("click", async () => {
  const btn = $("#btnToggle");
  btn.disabled = true;
  btn.textContent = "处理中...";

  // Save config first
  await saveConfig();

  // Check current status and toggle
  const status = await sendMsg({ type: "GET_STATUS" });
  const isRunning = status && status.polling;

  if (isRunning) {
    await sendMsg({ type: "STOP_POLLING" });
  } else {
    const res = await sendMsg({ type: "START_POLLING" });
    if (res && res.error) {
      console.error("启动失败:", res.error);
    }
  }

  // Reload status to update UI
  await loadStatus();
});

$("#btnTest").addEventListener("click", async () => {
  const testEl = $("#connTest");
  testEl.innerHTML = "测试中...";
  await saveConfig();
  const res = await sendMsg({ type: "TEST_CONNECTION" }, 5000);
  if (res && res.ok) {
    testEl.innerHTML = '<span class="ok">✓ 连接成功</span>';
  } else {
    testEl.innerHTML = `<span class="fail">✗ ${res?.error || "连接失败，请确认本地服务已启动"}</span>`;
  }
});

function saveConfig() {
  return new Promise((resolve) => {
    chrome.storage.local.get(["config"], (data) => {
      const existing = data.config || {};
      const config = {
        ...existing,
        serverUrl: $("#serverUrl").value.trim() || "http://localhost:3000",
        shopId: $("#shopId").value.trim(),
      };
      chrome.storage.local.set({ config }, resolve);
    });
  });
}

let refreshTimer = null;
function scheduleSaveAndRefresh() {
  clearTimeout(refreshTimer);
  refreshTimer = setTimeout(async () => {
    await saveConfig();
    await loadStatus();
  }, 400);
}

// 输入店铺名时要立即保存并刷新数量；change 只有失焦后才触发，容易看起来没有同步。
["shopId", "serverUrl"].forEach((id) => {
  const input = $(`#${id}`);
  input.addEventListener("input", scheduleSaveAndRefresh);
  input.addEventListener("change", async () => {
    clearTimeout(refreshTimer);
    await saveConfig();
    await loadStatus();
  });
});

loadStatus();