document.addEventListener("DOMContentLoaded", async () => {
  const input = document.getElementById("searchInput");
  const searchBtn = document.getElementById("searchBtn");
  const clearHistoryBtn = document.getElementById("clearHistoryBtn");
  const resultBox = document.getElementById("results");
  const historyBox = document.getElementById("historyTags");
  const historyWrapper = document.getElementById("historyWrapper");

  const userDropdown = document.getElementById("userDropdown");
  const logoutBtn = document.getElementById("logoutBtn");
  const userNameLabel = document.getElementById("userName");
  const userAvatar = document.getElementById("userAvatar");

  let token = null;
  let currentPage = 1;
  let totalPages = 1;
  let lastKeywords = [];

  const TOKEN_EXPIRE_MS = 24 * 60 * 60 * 1000;

  function log(...args) {
    const version = chrome?.runtime?.getManifest?.().version || "dev";
    console.log(`[v${version}]`, ...args);
  }

  async function loadToken() {
    return new Promise((resolve) => {
      chrome.storage.local.get(["token", "loginAt", "username"], (res) => {
        log("加载本地存储 token:", res);
        const now = Date.now();
        if (!res.token || !res.loginAt || (now - res.loginAt > TOKEN_EXPIRE_MS)) {
          log("token 不存在或已过期");
          resolve(null);
        } else {
          log("token 加载成功");
          resolve({
            token: res.token,
            username: res.username || "用户"
          });
        }
      });
    });
  }

  function handleLogout() {
    log("执行退出登录逻辑");
    chrome.storage.local.remove(["token", "loginAt", "username"], () => {
      chrome.action.setPopup({ popup: "login.html" });
      window.location.href = "login.html";
    });
  }

  function showLoading() {
    resultBox.innerHTML = "<li>加载中...</li>";
  }

  function clearResults() {
    resultBox.innerHTML = "";
    historyWrapper.classList.add("hidden");
  }

  function renderPagination() {
    const pagination = document.createElement("div");
    pagination.className = "pagination";

    if (currentPage > 1) {
      const prevBtn = document.createElement("button");
      prevBtn.textContent = "上一页";
      prevBtn.onclick = () => fetchResults(lastKeywords, currentPage - 1);
      pagination.appendChild(prevBtn);
    }

    if (currentPage < totalPages) {
      const nextBtn = document.createElement("button");
      nextBtn.textContent = "下一页";
      nextBtn.onclick = () => fetchResults(lastKeywords, currentPage + 1);
      pagination.appendChild(nextBtn);
    }

    resultBox.appendChild(pagination);
  }

  function updateHistory(keyword) {
    chrome.storage.local.get(["searchHistory"], (res) => {
      let history = res.searchHistory || [];
      history = [keyword, ...history.filter(item => item !== keyword)];
      if (history.length > 5) history = history.slice(0, 5);
      chrome.storage.local.set({ searchHistory: history });
    });
  }

  function renderHistoryTags() {
    chrome.storage.local.get(["searchHistory"], (res) => {
      const history = res.searchHistory || [];
      historyBox.innerHTML = "";
      if (history.length === 0) {
        historyWrapper.classList.add("hidden");
        return;
      }

      history.forEach(tagText => {
        const tag = document.createElement("span");
        tag.className = "tag";
        tag.textContent = tagText;
        tag.onclick = () => {
          input.value = tagText;
          triggerSearch();
        };
        historyBox.appendChild(tag);
      });

      historyWrapper.classList.remove("hidden");
    });
  }

  async function fetchResults(keywords, page) {
    log("执行搜索：", keywords, "page:", page);

    if (!token) {
      log("token 未初始化，跳转 login");
      handleLogout();
      return;
    }

    currentPage = page;
    lastKeywords = keywords;

    const keywordGroups = keywords.map(k => [k]);
    const requestBody = {
      keywordGroups,
      page: currentPage,
      size: 10
    };

    showLoading();

    try {
      const response = await fetch("http://app.wisdompulse.cn/search", {
        method: "POST",
        headers: {
          "Authorization": `${token}`,
          "Content-Type": "application/json"
        },
        body: JSON.stringify(requestBody)
      });

      log("响应状态:", response.status);

      if (response.status === 401) {
        log("后端返回 401，token 无效，登出");
        handleLogout();
        return;
      }

      const data = await response.json();
      resultBox.innerHTML = "";

      if (!data.results || data.results.length === 0) {
        resultBox.innerHTML = "<li>未找到相关文档</li>";
        return;
      }

      totalPages = Math.ceil(data.total / data.size);

      data.results.forEach(doc => {
        const li = document.createElement("li");
        const cleanPath = doc.filepath.replace(/^import-data\//, "").replace(/\.md$/, ".html");
        const link = document.createElement("a");
        link.href = `http://share.wisdompulse.cn/public/${cleanPath}`;
        link.target = "_blank";
        link.textContent = doc.filename;

        const snippet = document.createElement("div");
        snippet.className = "summary";
        snippet.innerHTML = doc.summary?.slice(0, 300) + "...";

        li.appendChild(link);
        li.appendChild(snippet);
        resultBox.appendChild(li);
      });

      renderPagination();

    } catch (err) {
      console.error("搜索请求失败:", err);
      resultBox.innerHTML = "<li>搜索失败，请检查网络或服务状态。</li>";
    }
  }

  function triggerSearch() {
    if (!token) {
      log("triggerSearch 中 token 丢失，取消搜索");
      return;
    }
    const val = input.value.trim();
    if (!val) return clearResults();
    const keywords = val.split(/\s+/);
    updateHistory(val);
    fetchResults(keywords, 1);
  }

  function bindEvents() {
    log("绑定事件成功");
    searchBtn.addEventListener("click", triggerSearch);
    input.addEventListener("keydown", (e) => {
      if (e.key === "Enter") {
        log("用户按下回车 ⏎");
        triggerSearch();
      }
    });
    input.addEventListener("focus", renderHistoryTags);
    input.addEventListener("input", () => !input.value.trim() && clearResults());
    input.addEventListener("blur", () => setTimeout(() => historyWrapper.classList.add("hidden"), 200));
    clearHistoryBtn.addEventListener("click", () => {
      chrome.storage.local.remove("searchHistory", renderHistoryTags);
    });
    logoutBtn.addEventListener("click", handleLogout);
    userAvatar.addEventListener("click", () => userDropdown.classList.toggle("hidden"));
    window.addEventListener("click", (e) => {
      if (!userDropdown.contains(e.target) && e.target !== userAvatar) {
        userDropdown.classList.add("hidden");
      }
    });
  }

  const auth = await loadToken();
  if (!auth) {
    log("未通过认证，执行登出");
    handleLogout();
  } else {
    token = auth.token;
    userNameLabel.textContent = auth.username;
    log("用户认证通过，用户名:", auth.username);
    bindEvents();
  }
});