// エラー表示
function showError(text) {
  const errorMsgElement = document.querySelector("#errorMsg");
  const errorElement = document.querySelector("#error");

  if (errorMsgElement) {
    errorMsgElement.textContent = text;
  }

  if (errorElement) {
    errorElement.style.display = "block";
    setTimeout(() => {
      errorElement.style.display = "none";
    }, 5000);
  }
}

document.addEventListener("DOMContentLoaded", async () => {
  try {
    // contents.json読み込み
    const response = await fetch("/contents.json");

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const data = await response.json();
    const articlesData = data.articles;

    if (!Array.isArray(articlesData)) {
      throw new Error("記事データが不正な形式です");
    }

    // #contents読み込み
    const contentsContainer = document.querySelector("#contents");

    if (!contentsContainer) {
      throw new Error("#contentsが見つかりません");
    }

    contentsContainer.innerHTML = "";

    // 記事一覧作成
    articlesData.forEach(article => {
      // ID取得
      const articleElement = document.createElement("div");
      articleElement.className = "items";
      articleElement.id = article.id;

      // 日付取得
      const dateElement = document.createElement("div");
      dateElement.className = "date";
      dateElement.textContent = String(article.date);

      // タイトル取得
      const titleElement = document.createElement("h1");
      titleElement.textContent = String(article.title);

      // 説明取得
      const descriptionElement = document.createElement("p");
      descriptionElement.textContent = String(article.description);

      // 親要素に追加
      articleElement.appendChild(dateElement);
      articleElement.appendChild(titleElement);
      articleElement.appendChild(descriptionElement);
      contentsContainer.appendChild(articleElement);
    });

    // URLパラメータから記事IDを取得
    const urlParams = new URLSearchParams(window.location.search);
    const articleId = urlParams.get("articles");

    if (articleId) {
      const article = articlesData.find(a => a && a.id === articleId);
      if (article) {
        showArticle(article);
      } else {
        showError("記事が存在しませんでした");
      }
    }

    // 記事移動
    contentsContainer.addEventListener("click", (e) => {
      const itemElement = e.target.closest(".items");
      if (itemElement && itemElement.id) {
        const id = itemElement.id;
        const article = articlesData.find(a => a && a.id === id);

        if (article) {
          showArticle(article);
          try {
            history.pushState({ articleId: id }, article.title, `?articles=${id}`);
          } catch (error) {
            console.warn("History API操作に失敗しました:", error);
          }
        } else {
          showError("記事が存在しませんでした");
        }
      }
    });

    // 検索
    const searchBox = document.querySelector("#searchbox");

    if (searchBox) {
      searchBox.addEventListener("input", (e) => {
        const searchText = (e.target.value || '').toLowerCase();
        const items = document.querySelectorAll("#contents .items");

        items.forEach(item => {
          const titleElement = item.querySelector("h1");
          const descriptionElement = item.querySelector("p");

          if (titleElement && descriptionElement) {
            const title = (titleElement.textContent || '').toLowerCase();
            const description = (descriptionElement.textContent || '').toLowerCase();

            if (title.includes(searchText) || description.includes(searchText)) {
              item.style.display = "block";
            } else {
              item.style.display = "none";
            }
          }
        });
      });
    }

    // 記事表示
    function showArticle(article) {
      // #docs・#top取得
      const docsElement = document.querySelector("#docs");
      const topElement = document.querySelector("#top");

      // データ存在確認
      if (docsElement && topElement && article && article.title && article.date) {
        // 記事div作成
        const articleDiv = document.createElement("div");
        articleDiv.className = "article";

        // タイトル取得
        const titleElement = document.createElement("h1");
        titleElement.textContent = String(article.title);

        // 日付取得
        const dateElement = document.createElement("div");
        dateElement.className = "date";
        dateElement.textContent = String(article.date);

        // 内容取得
        const contentElement = document.createElement("div");
        contentElement.className = "content";

        // Markdownパース
        try {
          const content = article.content || '';

          if (typeof marked !== 'undefined' && typeof marked.parse === 'function') {
            contentElement.innerHTML = marked.parse(content);
          } else {
            contentElement.textContent = content;
          }
        } catch (error) {
          console.error("Markdownパースエラー:", error);
          contentElement.textContent = article.content || '';
        }

        // 親要素に追加
        articleDiv.appendChild(titleElement);
        articleDiv.appendChild(dateElement);
        articleDiv.appendChild(contentElement);

        // 記事表示
        docsElement.innerHTML = "";
        docsElement.appendChild(articleDiv);
        docsElement.style.display = "block";

        // 記事一覧非表示
        const articleList = document.querySelectorAll(".articlelist");

        for (let i = 0; i < articleList.length; i++) {
          articleList[i].style.display = "none";
        }
      }
    }
  } catch (error) {
    console.error("データの読み込みに失敗しました:", error);
    showError("データの読み込みに失敗しました");
  }
});