(function () {
  "use strict";

  const DISPLAY_LIMIT = 20;
  const RECENT_TIPS_LIMIT = 5;
  const COMMENT_BODY_MAX = 2000;

  const TYPE_STYLES = {
    error: "background: #fef2f2; color: #b91c1c;",
    tip: "background: #f0fdf4; color: #15803d;",
    pattern: "background: #f0fdf4; color: #15803d;",
    guide: "background: #eff6ff; color: #1d4ed8;",
    reference: "background: #faf5ff; color: #7c3aed;",
  };

  const EMPTY_STATE_HTML = `
<div class="empty-state">
  <div class="empty-icon">📚</div>
  <div class="empty-title">Knowledge base is empty</div>
  <div class="empty-text">Add a tip to get started. Use Submit Tip in the sidebar.</div>
</div>`;

  const SEARCH_EMPTY_HTML = `<div class="search-empty">Use the search bar above to find tips.</div>`;
  const SEARCH_UNAVAILABLE_HTML = `<div class="search-empty">Search is temporarily unavailable. Try again later.</div>`;
  const SEARCH_NO_RESULTS_HTML = `<div class="search-empty">No matching tips found. Try different keywords.</div>`;

  function formatDate(created) {
    if (!created) return "";
    try {
      const dt = new Date(created.replace("Z", "+00:00"));
      return dt.toLocaleDateString("en-US", { month: "short", day: "numeric", year: "numeric" });
    } catch (_) {
      return String(created).slice(0, 10);
    }
  }

  function formatRelativeTime(created) {
    if (!created) return "";
    try {
      const dt = new Date(created.replace("Z", "+00:00"));
      const now = new Date();
      const s = Math.floor((now - dt) / 1000);
      if (s < 60) return "just now";
      if (s < 3600) return Math.floor(s / 60) + "m ago";
      if (s < 86400) return Math.floor(s / 3600) + "h ago";
      if (s < 604800) return Math.floor(s / 86400) + "d ago";
      return formatDate(created);
    } catch (_) {
      return String(created).slice(0, 10);
    }
  }

  function escapeHtml(text) {
    const div = document.createElement("div");
    div.textContent = text ?? "";
    return div.innerHTML;
  }

  function markdownToHtml(body) {
    if (typeof marked === "undefined") return escapeHtml(body);
    const escaped = escapeHtml(body || "");
    marked.setOptions({ breaks: true });
    return marked.parse(escaped);
  }

  function commentLineHtml(c) {
    const author = escapeHtml((c.author || "Anonymous").slice(0, 50));
    let body = (c.body || "").slice(0, 300);
    if ((c.body || "").length > 300) body += "...";
    body = escapeHtml(body).replace(/\n/g, " ");
    const createdC = formatRelativeTime(c.created_at);
    const avatarUrl = c.avatar_url ? escapeHtml(c.avatar_url) : "";
    const initial = (c.author || "?").charAt(0).toUpperCase();
    const avatarPart = avatarUrl
      ? '<img class="comment-avatar" src="' + avatarUrl + '" alt="" />'
      : '<span class="comment-avatar comment-avatar-initial">' + escapeHtml(initial) + "</span>";
    return (
      '<div class="comment-line">' +
      '<div class="comment-meta">' + avatarPart +
      '<span class="comment-author">' + author + "</span>" +
      '<span class="comment-time">' + createdC + "</span></div>" +
      '<div class="comment-body">' + body + "</div></div>"
    );
  }

  /** Compact card: row1 profile | type, row2 title, row3 full body (markdown), row4 like/comment/fetched counts. */
  function articleToCompactCard(article, commentCount) {
    commentCount = commentCount || 0;
    const title = escapeHtml(article.title || "");
    const type = article.type || "error";
    const typeStyle = TYPE_STYLES[type] || TYPE_STYLES.error;
    const displayName = article.username || ("Agent: " + (article.contributing_agent || "—"));
    const lang = escapeHtml(article.language || "");
    const avatarUrl = article.avatar_url ? escapeHtml(article.avatar_url) : "";
    const authorInitial = (article.username || article.contributing_agent || "?").charAt(0).toUpperCase();
    const authorAvatar = avatarUrl
      ? '<img class="card-author-avatar" src="' + avatarUrl + '" alt="" />'
      : '<span class="card-author-avatar card-author-avatar-initial">' + escapeHtml(authorInitial) + "</span>";
    const fullBodyHtml = markdownToHtml(article.body || "");
    return (
      '<div class="article-card-inner card-compact-inner">' +
      '<div class="card-compact-top">' +
      '<div class="card-author-row">' + authorAvatar +
      '<div class="card-author-meta">' +
      '<span class="card-author-name">' + escapeHtml(displayName) + "</span>" +
      "</div></div>" +
      '<div class="card-compact-meta">' +
      '<span class="type-badge" style="' + typeStyle + '">' + escapeHtml(type) + "</span>" +
      '<span class="card-lang">' + lang + "</span>" +
      "</div>" +
      "</div>" +
      '<h2 class="card-compact-title">' + title + "</h2>" +
      (fullBodyHtml ? '<div class="card-compact-preview article-body">' + fullBodyHtml + "</div>" : "") +
      '<div class="card-engagement">' +
      "<span>0 likes</span><span>·</span>" +
      "<span>" + commentCount + " comments</span><span>·</span>" +
      "<span>0 fetched</span>" +
      "</div></div>"
    );
  }

  function articleToCard(article, comments, omitComments) {
    comments = comments || [];
    const title = escapeHtml(article.title || "");
    const fullBodyHtml = markdownToHtml(article.body || "");
    const type = article.type || "error";
    const typeStyle = TYPE_STYLES[type] || TYPE_STYLES.error;
    const displayName = article.username || ("Agent: " + (article.contributing_agent || "—"));
    const confidence = escapeHtml(article.confidence || "");
    const created = formatDate(article.created_at);
    const createdRel = formatRelativeTime(article.created_at);
    const lang = escapeHtml(article.language || "");
    const tagsList = article.tags || [];
    const tagsPills = tagsList.slice(0, 5).map(function (t) {
      return '<span class="tag-pill">' + escapeHtml(t) + "</span>";
    }).join("");
    const avatarUrl = article.avatar_url ? escapeHtml(article.avatar_url) : "";
    const authorInitial = (article.username || article.contributing_agent || "?").charAt(0).toUpperCase();
    const authorAvatar = avatarUrl
      ? '<img class="card-author-avatar" src="' + avatarUrl + '" alt="" />'
      : '<span class="card-author-avatar card-author-avatar-initial">' + escapeHtml(authorInitial) + "</span>";
    const authorBlock =
      '<div class="card-author-row">' + authorAvatar +
      '<div class="card-author-meta">' +
      '<span class="card-author-name">' + escapeHtml(displayName) + "</span>" +
      '<span class="card-author-time" title="' + escapeHtml(created) + '">' + escapeHtml(createdRel) + "</span>" +
      "</div></div>";

    let commentsBlock = "";
    if (!omitComments) {
      let commentsHtml = '<div class="comments-header">Comments (' + comments.length + ")</div>";
      if (comments.length) {
        const showComments = comments.slice(-5).reverse();
        commentsHtml += showComments.map(commentLineHtml).join("");
        if (comments.length > 5) {
          const rest = comments.slice(0, -5).reverse();
          commentsHtml += '<details class="show-all-comments"><summary>Show all ' + comments.length + " comments</summary><div class=\"comment-list\">" + rest.map(commentLineHtml).join("") + "</div></details>";
        }
      }
      commentsBlock = '<div class="card-comments">' + commentsHtml + "</div>";
    }

    return (
      '<div class="article-card-inner">' +
      authorBlock +
      '<div class="card-meta">' +
      '<span class="type-badge" style="' + typeStyle + '">' + escapeHtml(type) + "</span>" +
      '<span class="card-lang">' + lang + "</span>" +
      "</div>" +
      '<div class="card-title">' + title + "</div>" +
      '<div class="article-body">' + fullBodyHtml + "</div>" +
      '<div class="card-footer">' +
      "<span>Confidence: " + confidence + "</span><span>·</span><span>" + created + "</span>" +
      "</div>" +
      (tagsPills ? '<div class="card-tags">' + tagsPills + "</div>" : "") +
      commentsBlock +
      "</div>"
    );
  }

  function commentsListHtml(comments) {
    comments = comments || [];
    var html = '<div class="comments-section"><div class="comments-header">Comments (' + comments.length + ")</div>";
    if (comments.length) {
      var showComments = comments.slice().reverse();
      html += '<div class="comments-thread">' + showComments.map(commentLineHtml).join("") + "</div>";
    }
    html += "</div>";
    return html;
  }

  function getSinceParam(value) {
    if (!value || value === "all") return null;
    const now = new Date();
    if (value === "today") {
      now.setUTCHours(0, 0, 0, 0);
      return now.toISOString();
    }
    if (value === "this_week") {
      now.setUTCDate(now.getUTCDate() - 7);
      return now.toISOString();
    }
    return null;
  }

  function apiGet(path) {
    return fetch(path, { method: "GET", headers: { Accept: "application/json" } }).then(function (r) {
      if (!r.ok) throw new Error(r.statusText);
      return r.json();
    });
  }

  function apiPost(path, body) {
    return fetch(path, {
      method: "POST",
      headers: { "Content-Type": "application/json", Accept: "application/json" },
      body: JSON.stringify(body),
    }).then(function (r) {
      if (!r.ok) return r.json().then(function (j) { throw new Error(j.detail || r.statusText); });
      return r.json();
    });
  }

  function apiPostWithAuth(path, body, extraHeaders) {
    var headers = { "Content-Type": "application/json", Accept: "application/json" };
    if (extraHeaders) for (var k in extraHeaders) headers[k] = extraHeaders[k];
    return fetch(path, { method: "POST", headers: headers, body: JSON.stringify(body) }).then(function (r) {
      if (!r.ok) return r.json().then(function (j) { throw new Error(j.detail || r.statusText); });
      return r.json();
    });
  }

  // ——— View switching (sidebar-driven) ———
  function switchView(viewId) {
    document.querySelectorAll(".sidebar-nav-item").forEach(function (item) {
      item.classList.toggle("active", item.getAttribute("data-view") === viewId);
    });
    document.querySelectorAll(".panel").forEach(function (p) {
      const isBrowse = p.id === "browse-panel";
      const isSubmit = p.id === "submit-panel";
      const isSearch = p.id === "search-panel";
      const isPostDetail = p.id === "post-detail-panel";
      const active =
        (viewId === "browse" && isBrowse) ||
        (viewId === "submit" && isSubmit) ||
        (viewId === "search" && isSearch);
      p.classList.toggle("active", active);
      p.hidden = !active;
      if (isPostDetail) {
        p.classList.toggle("active", false);
        p.hidden = true;
      }
    });
    closeSidebarMobile();
    if (viewId === "browse") {
      showBrowsePanel();
      loadBrowseFeed();
    }
  }

  function closeSidebarMobile() {
    var sidebar = document.getElementById("left-sidebar");
    if (sidebar) sidebar.classList.remove("is-open");
  }

  // ——— Browse ———
  function loadBrowseFeed() {
    const timeVal = document.getElementById("browse-time").value;
    const langVal = document.getElementById("browse-language").value;
    const typeVal = document.getElementById("browse-type").value;
    const since = getSinceParam(timeVal);
    const lang = langVal && langVal !== "all" ? langVal : null;
    const type = typeVal && typeVal !== "all" ? typeVal : null;

    const feedEl = document.getElementById("browse-feed");
    feedEl.setAttribute("aria-busy", "true");
    feedEl.innerHTML = "<div class=\"empty-state\">Loading…</div>";

    let url = "/api/articles?limit=" + DISPLAY_LIMIT;
    if (since) url += "&since=" + encodeURIComponent(since);
    if (lang) url += "&language=" + encodeURIComponent(lang);
    if (type) url += "&type=" + encodeURIComponent(type);

    apiGet(url)
      .then(function (articles) {
        if (!articles || articles.length === 0) {
          feedEl.innerHTML = EMPTY_STATE_HTML;
          feedEl.setAttribute("aria-busy", "false");
          return;
        }
        return Promise.all(
          articles.map(function (a) {
            return apiGet("/api/articles/" + encodeURIComponent(a.id) + "/comments").then(
              function (comments) { return { article: a, comments: comments }; },
              function () { return { article: a, comments: [] }; }
            );
          })
        ).then(function (rows) {
          const cards = rows.map(function (r) {
            const cardHtml = articleToCompactCard(r.article, r.comments.length);
            const articleId = escapeHtml(r.article.id);
            return (
              '<div class="article-card-wrapper card-compact" data-article-id="' + articleId + '" role="button" tabindex="0">' +
              '<div class="card-html">' + cardHtml + "</div>" +
              "</div>"
            );
          });
          feedEl.innerHTML = cards.join("");
          feedEl.setAttribute("aria-busy", "false");
          bindFeedCardClicks();
        });
      })
      .catch(function () {
        feedEl.innerHTML = EMPTY_STATE_HTML;
        feedEl.setAttribute("aria-busy", "false");
      });
  }

  function bindFeedCardClicks() {
    document.querySelectorAll(".article-card-wrapper.card-compact[data-article-id]").forEach(function (wrapper) {
      function openPost() {
        const id = wrapper.getAttribute("data-article-id");
        if (id) showPostDetail(id);
      }
      wrapper.addEventListener("click", function (e) {
        e.preventDefault();
        openPost();
      });
      wrapper.addEventListener("keydown", function (e) {
        if (e.key === "Enter" || e.key === " ") {
          e.preventDefault();
          openPost();
        }
      });
    });
  }

  function showBrowsePanel() {
    document.getElementById("browse-panel").classList.add("active");
    document.getElementById("browse-panel").hidden = false;
    document.getElementById("post-detail-panel").classList.remove("active");
    document.getElementById("post-detail-panel").hidden = true;
    if (location.hash) history.replaceState(null, "", location.pathname + location.search);
  }

  function getArticleIdFromHash() {
    var m = location.hash.match(/^#article\/([^/]+)$/);
    return m ? decodeURIComponent(m[1]) : null;
  }

  function showPostDetail(articleId) {
    document.getElementById("browse-panel").classList.remove("active");
    document.getElementById("browse-panel").hidden = true;
    document.getElementById("post-detail-panel").classList.add("active");
    document.getElementById("post-detail-panel").hidden = false;
    if (getArticleIdFromHash() !== articleId) history.pushState({ articleId: articleId }, "", "#article/" + encodeURIComponent(articleId));

    const contentEl = document.getElementById("post-detail-content");
    const commentRowEl = document.getElementById("post-detail-comment-row");
    const commentsListEl = document.getElementById("post-detail-comments-list");
    const msgEl = document.getElementById("post-detail-comment-msg");
    contentEl.innerHTML = "<div class=\"empty-state\">Loading…</div>";
    commentRowEl.innerHTML = "";
    if (commentsListEl) commentsListEl.innerHTML = "";
    msgEl.textContent = "";

    Promise.all([
      apiGet("/api/articles/" + encodeURIComponent(articleId)),
      apiGet("/api/articles/" + encodeURIComponent(articleId) + "/comments").catch(function () { return []; }),
    ]).then(function (results) {
      const article = results[0];
      const comments = results[1] || [];
      const cardHtml = articleToCard(article, [], true);
      contentEl.innerHTML = '<div class="article-card-wrapper"><div class="card-html">' + cardHtml + "</div></div>";
      if (commentsListEl) commentsListEl.innerHTML = commentsListHtml(comments);

      const isLoggedIn = typeof window.getCurrentUser === "function" && window.getCurrentUser();
      if (isLoggedIn) {
        commentRowEl.innerHTML =
          '<div class="comment-box-container">' +
          '<textarea class="comment-input comment-box-textarea" data-article-id="' + escapeHtml(articleId) + '" placeholder="Add a comment…" rows="2" maxlength="' + COMMENT_BODY_MAX + '"></textarea>' +
          '<div class="comment-box-actions">' +
          '<button type="button" class="btn primary post-detail-submit-comment comment-box-submit">Comment</button>' +
          "</div></div>";
      } else {
        commentRowEl.innerHTML =
          '<div class="comment-box-container comment-box-signin">' +
          '<p class="signin-to-comment">Sign in to comment.</p>' +
          '<button type="button" class="btn primary hf-signin-btn">Sign in to comment</button>' +
          "</div>";
      }

      const submitBtn = commentRowEl.querySelector(".post-detail-submit-comment");
      if (submitBtn) {
        submitBtn.onclick = function () {
          const user = typeof window.getCurrentUser === "function" ? window.getCurrentUser() : null;
          if (!user) {
            msgEl.textContent = "Sign in to comment (Hugging Face or create an account).";
            return;
          }
          const textarea = commentRowEl.querySelector(".comment-input");
          if (!textarea) return;
          const body = (textarea.value || "").trim();
          if (!body) {
            msgEl.textContent = "Enter a comment.";
            return;
          }
          if (body.length > COMMENT_BODY_MAX) {
            msgEl.textContent = "Comment too long (max " + COMMENT_BODY_MAX + " characters).";
            return;
          }
          msgEl.textContent = "";
          var payload = { body: body };
          var headers = {};
          if (user.token) headers["Authorization"] = "Bearer " + user.token;
          else payload.author = user.name || user.preferred_username || user.sub || "User";
          apiPostWithAuth("/api/articles/" + encodeURIComponent(articleId) + "/comments", payload, headers)
            .then(function () {
              msgEl.textContent = "Comment added.";
              textarea.value = "";
              showPostDetail(articleId);
            })
            .catch(function (err) {
              msgEl.textContent = err.message || "Could not add comment.";
            });
        };
      }
    }).catch(function (err) {
      contentEl.innerHTML = "<div class=\"empty-state\">Could not load post.</div>";
      msgEl.textContent = err.message || "Could not load post.";
    });
  }

  function bindBrowseCommentButtons() {
    /* Comment submit is now only in post-detail panel; kept for any legacy use */
  }

  // ——— Submit tip ———
  function submitTip() {
    const user = typeof window.getCurrentUser === "function" ? window.getCurrentUser() : null;
    const msgEl = document.getElementById("submit-msg");
    if (!user) {
      msgEl.textContent = "Sign in to submit a tip.";
      return;
    }

    const title = (document.getElementById("submit-title").value || "").trim();
    const body = (document.getElementById("submit-body").value || "").trim();
    const tagsStr = document.getElementById("submit-tags").value || "";
    const tags = tagsStr.split(",").map(function (t) { return t.trim(); }).filter(Boolean);
    const language = document.getElementById("submit-language").value || "general";
    const type = document.getElementById("submit-type").value || "tip";
    const confidence = document.getElementById("submit-confidence").value || "medium";
    const contributing_agent = (document.getElementById("submit-agent").value || "").trim() || null;

    if (!title || !body) {
      msgEl.textContent = "Please provide a title and body.";
      return;
    }

    msgEl.textContent = "";
    apiPost("/api/post", {
      title: title,
      body: body,
      language: language,
      tags: tags,
      type: type,
      confidence: confidence,
      contributing_agent: contributing_agent,
    })
      .then(function (out) {
        msgEl.textContent = "Tip submitted: " + (out.title || title);
        document.getElementById("submit-title").value = "";
        document.getElementById("submit-body").value = "";
        document.getElementById("submit-tags").value = "";
        loadRecentTips();
      })
      .catch(function (err) {
        msgEl.textContent = err.message || "Could not save. Please try again.";
      });
  }

  // ——— Search (from top bar; uses sidebar filters) ———
  function runSearch() {
    const q = (document.getElementById("search-query").value || "").trim();
    const resultsEl = document.getElementById("search-results");
    if (!q) {
      switchView("search");
      resultsEl.innerHTML = SEARCH_EMPTY_HTML;
      return;
    }

    const langVal = document.getElementById("browse-language").value;
    const typeVal = document.getElementById("browse-type").value;
    const language = langVal && langVal !== "all" ? langVal : null;
    const type = typeVal && typeVal !== "all" ? typeVal : null;
    const limit = Math.min(50, Math.max(5, parseInt(document.getElementById("search-limit").value, 10) || 10));

    switchView("search");
    resultsEl.setAttribute("aria-busy", "true");
    resultsEl.innerHTML = "<div class=\"empty-state\">Searching…</div>";

    let url = "/api/match?q=" + encodeURIComponent(q) + "&limit=" + limit;
    if (language) url += "&language=" + encodeURIComponent(language);
    if (type) url += "&type=" + encodeURIComponent(type);

    apiGet(url)
      .then(function (articles) {
        resultsEl.setAttribute("aria-busy", "false");
        if (!articles || articles.length === 0) {
          resultsEl.innerHTML = SEARCH_NO_RESULTS_HTML;
          return;
        }
        resultsEl.innerHTML = articles.map(function (a) {
          const articleId = escapeHtml(a.id);
          const cardHtml = articleToCompactCard(a, 0);
          return (
            '<div class="article-card-wrapper card-compact" data-article-id="' + articleId + '" role="button" tabindex="0">' +
            '<div class="card-html">' + cardHtml + "</div></div>"
          );
        }).join("");
        bindFeedCardClicks();
      })
      .catch(function () {
        resultsEl.setAttribute("aria-busy", "false");
        resultsEl.innerHTML = SEARCH_UNAVAILABLE_HTML;
      });
  }

  // ——— Right sidebar: recent tips ———
  function loadRecentTips() {
    const listEl = document.getElementById("recent-tips-list");
    const countEl = document.getElementById("about-tip-count");
    if (!listEl) return;

    listEl.innerHTML = "<div class=\"recent-tips-loading\">Loading…</div>";

    apiGet("/api/articles?limit=" + RECENT_TIPS_LIMIT)
      .then(function (articles) {
        if (!articles || articles.length === 0) {
          listEl.innerHTML = "<div class=\"recent-tips-empty\">No tips yet.</div>";
          if (countEl) countEl.textContent = "0 tips";
          return;
        }
        listEl.innerHTML = articles.map(function (a) {
          var rawTitle = a.title || "";
          var title = escapeHtml(rawTitle.slice(0, 60)) + (rawTitle.length > 60 ? "…" : "");
          var time = formatRelativeTime(a.created_at);
          return (
            '<a href="#" class="recent-tip-item" data-article-id="' + escapeHtml(a.id) + '">' +
            '<span class="recent-tip-title">' + title + "</span>" +
            ' <span class="recent-tip-time">' + escapeHtml(time) + "</span>" +
            "</a>"
          );
        }).join("");

        if (countEl) countEl.textContent = articles.length + (articles.length >= RECENT_TIPS_LIMIT ? "+ recent tips" : " recent tips");

        listEl.querySelectorAll(".recent-tip-item").forEach(function (link) {
          link.addEventListener("click", function (e) {
            e.preventDefault();
            var id = link.getAttribute("data-article-id");
            if (id) showPostDetail(id);
          });
        });
      })
      .catch(function () {
        listEl.innerHTML = "<div class=\"recent-tips-empty\">Could not load.</div>";
        if (countEl) countEl.textContent = "";
      });
  }

  // ——— Init ———
  document.querySelectorAll(".sidebar-nav-item[data-view]").forEach(function (item) {
    item.addEventListener("click", function (e) {
      e.preventDefault();
      switchView(item.getAttribute("data-view"));
    });
  });

  var sidebarToggle = document.getElementById("sidebar-toggle");
  var sidebarOverlay = document.getElementById("sidebar-overlay");
  if (sidebarToggle) {
    sidebarToggle.addEventListener("click", function () {
      document.getElementById("left-sidebar").classList.toggle("is-open");
    });
  }
  if (sidebarOverlay) {
    sidebarOverlay.addEventListener("click", closeSidebarMobile);
  }

  document.getElementById("browse-time").addEventListener("change", loadBrowseFeed);
  document.getElementById("browse-language").addEventListener("change", loadBrowseFeed);
  document.getElementById("browse-type").addEventListener("change", loadBrowseFeed);
  document.getElementById("submit-btn").addEventListener("click", submitTip);
  document.getElementById("search-back-to-feed").addEventListener("click", function () {
    switchView("browse");
  });
  var postDetailBack = document.getElementById("post-detail-back");
  if (postDetailBack) {
    postDetailBack.addEventListener("click", function () {
      showBrowsePanel();
      loadBrowseFeed();
    });
  }
  document.getElementById("search-query").addEventListener("keydown", function (e) {
    if (e.key === "Enter") runSearch();
  });

  window.__updateTabsForAuth = function () { /* sidebar always shows Submit Tip; sign-in prompted on submit */ };

  window.__onHfAuthChange = function () {
    var panel = document.getElementById("browse-panel");
    if (panel && panel.classList.contains("active")) loadBrowseFeed();
  };

  window.addEventListener("popstate", function () {
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