(function () {
  const vscode = acquireVsCodeApi();

  const feedScrollEl = document.getElementById("feed-scroll");
  const headerRagSessionEl = document.getElementById("header-rag-session");
  const headerRagSessionValueEl = document.getElementById("header-rag-session-value");
  const processVersionEl = document.getElementById("process-version");
  const statusBlocksEl = document.getElementById("status-blocks");
  const messagesEl = document.getElementById("messages");
  const inputEl = document.getElementById("input");
  const btnSend = document.getElementById("btn-send");
  const btnClear = document.getElementById("btn-clear");
  const btnMenu = document.getElementById("btn-menu");
  const menuDropdown = document.getElementById("menu-dropdown");
  const taskStatusEl = document.getElementById("task-status");
  const taskStatusLabelEl = document.getElementById("task-status-label");
  const taskStatusDetailEl = document.getElementById("task-status-detail");
  const taskProgressEl = document.getElementById("task-progress");
  const taskProgressBarEl = document.getElementById("task-progress-bar");
  const ragDotEl = document.getElementById("rag-dot");
  const ragLabelEl = document.getElementById("rag-label");
  const ragDetailEl = document.getElementById("rag-detail");
  const ragMetricsEl = document.getElementById("rag-metrics");
  let currentRagSessionId = "";

  function renderStatusBlocks(items) {
    statusBlocksEl.innerHTML = "";
    (items || []).forEach(function (block) {
      const wrap = document.createElement("div");
      wrap.className = "status-block";

      const title = document.createElement("div");
      title.className = "status-block-title";
      title.textContent = block.title || block.id || "Status";
      wrap.appendChild(title);

      const body = document.createElement("div");
      body.className = "status-block-body";
      (block.lines || []).forEach(function (line) {
        const item = document.createElement("div");
        item.className = "status-block-line";
        item.textContent = line || "";
        body.appendChild(item);
      });
      wrap.appendChild(body);
      statusBlocksEl.appendChild(wrap);
    });
  }

  function renderMessages(items) {
    messagesEl.innerHTML = "";
    (items || []).forEach(function (m) {
      const div = document.createElement("div");
      var roleClass = "msg-assistant";
      if (m.role === "user") {
        roleClass = "msg-user";
      } else if (m.role === "status") {
        roleClass = "msg-status";
      } else if (m.role === "error") {
        roleClass = "msg-error";
      }
      div.className = "msg " + roleClass;
      const text = document.createElement("div");
      text.className = m.kind === "markdown" ? "msg-markdown" : "msg-text";
      text.textContent = m.text || "";
      if (m.role !== "status") {
        const role = document.createElement("div");
        role.className = "msg-role";
        role.textContent =
          m.role === "user" ? "Вы" : m.role === "error" ? "Ошибка" : "Ответ";
        div.appendChild(role);
      }
      div.appendChild(text);
      messagesEl.appendChild(div);
    });
  }

  function renderTaskStatus(status) {
    var visible = Boolean(status && status.visible);
    taskStatusEl.hidden = !visible;
    if (!visible) {
      taskProgressEl.hidden = true;
      taskProgressBarEl.style.width = "0%";
      return;
    }
    taskStatusLabelEl.textContent = status.label || "Статус";
    taskStatusDetailEl.textContent = status.detail || "";
    if (typeof status.progress === "number" && isFinite(status.progress)) {
      taskProgressEl.hidden = false;
      taskProgressBarEl.style.width = Math.max(0, Math.min(100, status.progress)) + "%";
    } else {
      taskProgressEl.hidden = true;
      taskProgressBarEl.style.width = "0%";
    }
  }

  function renderRagStatus(status) {
    var state = (status && status.state) || "idle";
    var sessionId = (status && status.ragSessionId) || "";
    currentRagSessionId = sessionId;
    ragDotEl.className = "rag-dot state-" + state;
    ragLabelEl.textContent = (status && status.label) || "RAG не готов";
    ragDetailEl.textContent =
      (status && status.detail) || "Ожидается индексация проекта.";
    if (headerRagSessionEl && headerRagSessionValueEl) {
      headerRagSessionValueEl.textContent = sessionId || "—";
      headerRagSessionEl.title = sessionId
        ? "Кликните, чтобы скопировать RAG session id"
        : "RAG session is not created yet.";
    }
    var metrics = [];
    if (status) {
      metrics.push("indexed: " + (status.indexedFiles || 0));
      metrics.push("failed: " + (status.failedFiles || 0));
      metrics.push("cache hit: " + (status.cacheHitFiles || 0));
      metrics.push("cache miss: " + (status.cacheMissFiles || 0));
    }
    ragMetricsEl.textContent = metrics.join(" | ");
  }

  function renderState(state) {
    renderStatusBlocks(state.statusBlocks);
    renderMessages(state.messages);
    renderTaskStatus(state.taskStatus);
    renderRagStatus(state.ragStatus);
    if (processVersionEl && state && state.processVersion) {
      processVersionEl.value = state.processVersion;
    }
    btnSend.disabled = false;
    inputEl.disabled = false;
    btnClear.disabled = Boolean(state.busy);
    if (feedScrollEl) {
      feedScrollEl.scrollTop = feedScrollEl.scrollHeight;
    }
  }

  window.addEventListener("message", function (event) {
    const msg = event.data;
    if (msg && msg.type === "state") {
      renderState(msg.payload || {});
    }
  });

  function send() {
    const text = (inputEl.value || "").trim();
    if (!text) {
      return;
    }
    vscode.postMessage({ type: "send", text: text });
    inputEl.value = "";
  }

  btnSend.addEventListener("click", send);
  inputEl.addEventListener("keydown", function (e) {
    if (e.key === "Enter" && !e.shiftKey) {
      e.preventDefault();
      send();
    }
  });

  btnClear.addEventListener("click", function () {
    vscode.postMessage({ type: "clear" });
  });

  processVersionEl.addEventListener("change", function () {
    vscode.postMessage({
      type: "set-process-version",
      value: processVersionEl.value || "v2",
    });
  });

  async function copyRagSessionId() {
    if (!currentRagSessionId) {
      return;
    }
    try {
      if (navigator.clipboard && typeof navigator.clipboard.writeText === "function") {
        await navigator.clipboard.writeText(currentRagSessionId);
      } else {
        const helper = document.createElement("textarea");
        helper.value = currentRagSessionId;
        helper.style.position = "fixed";
        helper.style.opacity = "0";
        document.body.appendChild(helper);
        helper.focus();
        helper.select();
        document.execCommand("copy");
        document.body.removeChild(helper);
      }
      if (headerRagSessionEl) {
        headerRagSessionEl.classList.add("copied");
        window.setTimeout(function () {
          headerRagSessionEl.classList.remove("copied");
        }, 1200);
      }
    } catch (error) {
      console.error("Failed to copy RAG session id", error);
    }
  }

  headerRagSessionEl.addEventListener("click", function () {
    void copyRagSessionId();
  });

  headerRagSessionEl.addEventListener("keydown", function (event) {
    if (event.key === "Enter" || event.key === " ") {
      event.preventDefault();
      void copyRagSessionId();
    }
  });

  btnMenu.addEventListener("click", function (e) {
    e.stopPropagation();
    const open = menuDropdown.hidden;
    menuDropdown.hidden = !open;
    btnMenu.setAttribute("aria-expanded", open ? "true" : "false");
  });

  document.addEventListener("click", function () {
    if (!menuDropdown.hidden) {
      menuDropdown.hidden = true;
      btnMenu.setAttribute("aria-expanded", "false");
    }
  });

  menuDropdown.addEventListener("click", function (e) {
    e.stopPropagation();
    const t = e.target;
    if (t && t.classList && t.classList.contains("menu-item")) {
      const action = t.getAttribute("data-action") || "";
      vscode.postMessage({ type: "menu", action: action });
      menuDropdown.hidden = true;
      btnMenu.setAttribute("aria-expanded", "false");
    }
  });

  vscode.postMessage({ type: "ready" });
})();