document.addEventListener("DOMContentLoaded", () => {
  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");

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

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

  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) {
    if (!chrome?.storage?.local) return;
    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() {
    if (!chrome?.storage?.local) return;
    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) {
    currentPage = page;
    lastKeywords = keywords;

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

    log("触发搜索:", requestBody);
    showLoading();

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

      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("[ERROR] 搜索失败:", err);
      resultBox.innerHTML = "<li>搜索失败，请检查网络或服务状态。</li>";
    }
  }

  function triggerSearch() {
    const inputValue = input.value.trim();
    if (!inputValue) {
      clearResults();
      return;
    }
    const keywords = inputValue.split(/\s+/).filter(Boolean);
    updateHistory(inputValue);
    fetchResults(keywords, 1);
  }

  searchBtn.addEventListener("click", triggerSearch);
  input.addEventListener("keydown", e => {
    if (e.key === "Enter") triggerSearch();
  });

  input.addEventListener("focus", renderHistoryTags);
  input.addEventListener("input", () => {
    if (!input.value.trim()) clearResults();
  });

  input.addEventListener("blur", () => {
    setTimeout(() => historyWrapper.classList.add("hidden"), 200);
  });

  clearHistoryBtn.addEventListener("click", () => {
    chrome.storage.local.remove("searchHistory", () => {
      log("历史记录已清空");
      renderHistoryTags();
    });
  });

  log("插件初始化完成");
});