(function () {
  var workspace = document.querySelector(".workspace");
  var sidebarToggle = document.getElementById("sidebarToggle");
  var mobileSidebarToggle = document.getElementById("mobileSidebarToggle");
  var userMenu = document.getElementById("userMenu");
  var userMenuTrigger = document.getElementById("userMenuTrigger");
  var chatScroll = document.getElementById("chatScroll");
  var nodeRail = document.getElementById("nodeRail");
  var composer = document.getElementById("chatComposer");
  var promptInput = document.getElementById("prompt");
  var sendButton = document.getElementById("sendButton");
  var conversationIdInput = document.getElementById("conversationIdInput");
  var chatStage = document.querySelector(".chat-stage");
  var nodeAnchors = [];

  if (!workspace) {
    return;
  }

  function isMobile() {
    return window.matchMedia("(max-width: 980px)").matches;
  }

  function toggleSidebar() {
    var state = workspace.getAttribute("data-sidebar-state");
    if (isMobile()) {
      workspace.setAttribute("data-sidebar-state", state === "open" ? "closed" : "open");
      return;
    }
    workspace.setAttribute("data-sidebar-state", state === "collapsed" ? "open" : "collapsed");
  }

  function syncSidebarState() {
    if (isMobile()) {
      if (workspace.getAttribute("data-sidebar-state") === "collapsed") {
        workspace.setAttribute("data-sidebar-state", "closed");
      }
    } else if (workspace.getAttribute("data-sidebar-state") === "closed") {
      workspace.setAttribute("data-sidebar-state", "open");
    }
  }

  function refreshNodeAnchors() {
    nodeAnchors = Array.prototype.slice.call(document.querySelectorAll(".node-anchor"));
  }

  if (sidebarToggle) {
    sidebarToggle.addEventListener("click", toggleSidebar);
  }

  if (mobileSidebarToggle) {
    mobileSidebarToggle.addEventListener("click", toggleSidebar);
  }

  if (userMenu && userMenuTrigger) {
    userMenuTrigger.addEventListener("click", function () {
      var isOpen = userMenu.classList.toggle("open");
      userMenuTrigger.setAttribute("aria-expanded", isOpen ? "true" : "false");
    });

    document.addEventListener("click", function (event) {
      if (!userMenu.contains(event.target)) {
        userMenu.classList.remove("open");
        userMenuTrigger.setAttribute("aria-expanded", "false");
      }
    });
  }

  function setActiveNode() {
    if (!chatScroll || !nodeAnchors.length) {
      return;
    }

    var activeTarget = nodeAnchors[0].getAttribute("data-target");
    var scrollTop = chatScroll.scrollTop;
    var threshold = 80;

    nodeAnchors.forEach(function (anchor) {
      var targetId = anchor.getAttribute("data-target");
      var target = document.getElementById(targetId);
      if (!target) {
        return;
      }

      if (target.offsetTop - threshold <= scrollTop) {
        activeTarget = targetId;
      }
    });

    nodeAnchors.forEach(function (anchor) {
      anchor.classList.toggle("active", anchor.getAttribute("data-target") === activeTarget);
    });
  }

  function bindNodeAnchorClicks() {
    if (!chatScroll) {
      return;
    }
    nodeAnchors.forEach(function (anchor) {
      if (anchor.dataset.bound === "true") {
        return;
      }
      anchor.dataset.bound = "true";
      anchor.addEventListener("click", function (event) {
        event.preventDefault();
        var targetId = anchor.getAttribute("data-target");
        var target = document.getElementById(targetId);
        if (!target) {
          return;
        }
        chatScroll.scrollTo({
          top: Math.max(target.offsetTop - 20, 0),
          behavior: "smooth",
        });
      });
    });
  }

  function ensureNodeRailVisible() {
    if (nodeRail) {
      nodeRail.classList.remove("hidden");
    }
  }

  function syncNodeRailVisibility() {
    if (!nodeRail) {
      return;
    }
    refreshNodeAnchors();
    if (nodeAnchors.length) {
      nodeRail.classList.remove("hidden");
    } else {
      nodeRail.classList.add("hidden");
    }
  }

  function escapeHtml(text) {
    return text
      .replace(/&/g, "&amp;")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/\"/g, "&quot;")
      .replace(/'/g, "&#039;");
  }

  function nl2br(text) {
    return escapeHtml(text).replace(/\n/g, "<br>");
  }

  function scrollChatToBottom() {
    if (chatScroll) {
      chatScroll.scrollTop = chatScroll.scrollHeight;
    }
  }

  function createMessage(role, content, messageId, label) {
    var article = document.createElement("article");
    article.className = "message " + role;
    article.id = messageId;
    if (label) {
      article.setAttribute("data-node-label", label);
    }

    var avatar = document.createElement("div");
    avatar.className = "message-avatar" + (role === "user" ? " user-mark" : "");
    avatar.textContent = role === "assistant" ? "AI" : userMenuTrigger.querySelector(".avatar").textContent.trim();

    var bubble = document.createElement("div");
    bubble.className = "message-bubble";

    var text = document.createElement("p");
    text.innerHTML = nl2br(content);
    bubble.appendChild(text);

    article.appendChild(avatar);
    article.appendChild(bubble);
    chatScroll.appendChild(article);
    return { article: article, bubble: bubble, text: text };
  }

  function appendNode(targetId, title, isLatest) {
    if (!nodeRail) {
      return;
    }
    ensureNodeRailVisible();
    var anchor = document.createElement("a");
    anchor.className = "node-anchor" + (isLatest ? " latest" : "");
    anchor.href = "#" + targetId;
    anchor.setAttribute("data-target", targetId);
    anchor.title = title;

    var dot = document.createElement("span");
    dot.className = "node-dot";
    anchor.appendChild(dot);
    nodeRail.appendChild(anchor);
    syncNodeRailVisibility();
    bindNodeAnchorClicks();
    setActiveNode();
  }

  function updateSidebarConversation(conversationId, title) {
    if (!conversationId || !title) {
      return;
    }
    var encodedTitle = title;
    var existing = document.querySelector('.history-item[href*="conversation=' + conversationId + '"]');
    var list = document.querySelector(".history-list");
    var currentTime = new Date();
    var month = String(currentTime.getMonth() + 1).padStart(2, "0");
    var day = String(currentTime.getDate()).padStart(2, "0");
    var hours = String(currentTime.getHours()).padStart(2, "0");
    var minutes = String(currentTime.getMinutes()).padStart(2, "0");
    var meta = month + "月" + day + "日 " + hours + ":" + minutes;

    document.querySelectorAll(".history-item.active").forEach(function (item) {
      item.classList.remove("active");
    });

    if (existing) {
      existing.classList.add("active");
      existing.querySelector(".history-title").textContent = encodedTitle;
      existing.querySelector(".history-meta").textContent = meta;
      if (list.firstElementChild !== existing) {
        list.prepend(existing);
      }
      return;
    }

    if (!list) {
      return;
    }

    var empty = list.querySelector(".history-empty");
    if (empty) {
      empty.remove();
    }

    var item = document.createElement("a");
    item.className = "history-item active";
    item.href = "/?conversation=" + conversationId;
    item.innerHTML =
      '<span class="history-title">' +
      escapeHtml(encodedTitle) +
      '</span><span class="history-meta">' +
      meta +
      "</span>";
    list.prepend(item);
  }

  function setConversationTitle(title) {
    if (!title) {
      return;
    }
    var header = document.querySelector(".conversation-header h1");
    var empty = document.querySelector(".empty-state");
    if (empty) {
      empty.remove();
      var headerWrap = document.createElement("div");
      headerWrap.className = "conversation-header";
      headerWrap.id = "conversation-top";
      headerWrap.setAttribute("data-node-label", "会话开始");
      headerWrap.innerHTML =
        '<div><p class="eyebrow">审核智能体</p><h1>' +
        escapeHtml(title) +
        '</h1></div><span class="conversation-meta">正在生成回复</span>';
      chatScroll.prepend(headerWrap);
      return;
    }
    if (header) {
      header.textContent = title;
    }
  }

  async function streamChat(event) {
    event.preventDefault();
    if (!composer || !promptInput || !sendButton || !chatStage) {
      return;
    }

    var prompt = promptInput.value.trim();
    if (!prompt || sendButton.disabled) {
      return;
    }

    sendButton.disabled = true;
    sendButton.textContent = "生成中...";

    var formData = new FormData(composer);
    var csrfToken = formData.get("csrfmiddlewaretoken");
    var streamUrl = chatStage.getAttribute("data-stream-url");
    var tempUserId = "message-user-temp-" + Date.now();
    var tempAssistantId = "message-ai-temp-" + (Date.now() + 1);
    var userLabel = "用户 " + (document.querySelectorAll(".message").length + 1);

    setConversationTitle((prompt || "").slice(0, 24));
    var userMessage = createMessage("user", prompt, tempUserId, userLabel);
    var assistantMessage = createMessage("assistant", "", tempAssistantId, "");
    assistantMessage.bubble.classList.add("streaming");
    appendNode(userMessage.article.id, userLabel, false);
    scrollChatToBottom();
    promptInput.value = "";

    try {
      var response = await fetch(streamUrl, {
        method: "POST",
        headers: {
          "X-CSRFToken": csrfToken,
        },
        body: formData,
      });

      if (!response.ok || !response.body) {
        throw new Error("流式请求失败。");
      }

      var reader = response.body.getReader();
      var decoder = new TextDecoder("utf-8");
      var buffer = "";
      var assistantText = "";

      while (true) {
        var readResult = await reader.read();
        if (readResult.done) {
          break;
        }

        buffer += decoder.decode(readResult.value, { stream: true });
        var events = buffer.split("\n\n");
        buffer = events.pop();

        events.forEach(function (frame) {
          var eventName = "";
          var dataText = "";
          frame.split("\n").forEach(function (line) {
            if (line.indexOf("event:") === 0) {
              eventName = line.slice(6).trim();
            }
            if (line.indexOf("data:") === 0) {
              dataText += line.slice(5).trim();
            }
          });

          if (!eventName || !dataText) {
            return;
          }

          var payload = JSON.parse(dataText);
          if (eventName === "meta") {
            if (payload.conversation_id) {
              conversationIdInput.value = payload.conversation_id;
              window.history.replaceState({}, "", "/?conversation=" + payload.conversation_id);
            }
            if (payload.title) {
              setConversationTitle(payload.title);
              updateSidebarConversation(payload.conversation_id, payload.title);
            }
          } else if (eventName === "chunk") {
            assistantText += payload.delta || "";
            assistantMessage.text.innerHTML = nl2br(assistantText);
            scrollChatToBottom();
          } else if (eventName === "error") {
            assistantText = payload.message || "模型调用失败。";
            assistantMessage.text.innerHTML = nl2br(assistantText);
          } else if (eventName === "done") {
            if (payload.assistant_message_id) {
              assistantMessage.article.id = "message-" + payload.assistant_message_id;
            }
            if (payload.title) {
              setConversationTitle(payload.title);
              updateSidebarConversation(payload.conversation_id, payload.title);
            }
          }
        });
      }

      assistantMessage.bubble.classList.remove("streaming");
      syncNodeRailVisibility();
      bindNodeAnchorClicks();
      setActiveNode();
      scrollChatToBottom();
    } catch (error) {
      assistantMessage.bubble.classList.remove("streaming");
      assistantMessage.text.textContent = "请求失败，请稍后重试。";
    } finally {
      sendButton.disabled = false;
      sendButton.textContent = "发送";
      promptInput.focus();
    }
  }

  syncNodeRailVisibility();
  bindNodeAnchorClicks();

  if (chatScroll) {
    chatScroll.addEventListener("scroll", setActiveNode, { passive: true });
    setActiveNode();
  }

  if (composer) {
    composer.addEventListener("submit", streamChat);
  }

  window.addEventListener("resize", syncSidebarState);
  syncSidebarState();
})();