export class AppView {
  constructor(reviewStore) {
    this.reviewStore = reviewStore;
    this.el = {
      layout: document.getElementById("layout-root"),
      splitterLeft: document.getElementById("splitter-left"),
      splitterRight: document.getElementById("splitter-right"),
      pickFallback: document.getElementById("pick-project-fallback"),
      projectName: document.getElementById("project-name"),
      indexStatus: document.getElementById("index-status"),
      treeInfo: document.getElementById("tree-info"),
      treeRoot: document.getElementById("tree-root"),
      fileTabs: document.getElementById("file-tabs"),
      newTextTabBtn: document.getElementById("new-text-tab"),
      mdToggleBtn: document.getElementById("md-toggle-mode"),
      fileEditor: document.getElementById("file-editor"),
      mdPreview: document.getElementById("md-preview"),
      editorInfo: document.getElementById("editor-info"),
      saveFileBtn: document.getElementById("save-file"),
      closeFileBtn: document.getElementById("close-file"),
      diffView: document.getElementById("diff-view"),
      changeList: document.getElementById("change-list"),
      toolbar: document.getElementById("review-toolbar"),
      applyAccepted: document.getElementById("apply-accepted"),
      newChatSessionBtn: document.getElementById("new-chat-session"),
      chatLog: document.getElementById("chat-log"),
      chatForm: document.getElementById("chat-form"),
      chatInput: document.getElementById("chat-input")
    };
  }

  setIndexStatus(text) {
    if (this.el.indexStatus) this.el.indexStatus.textContent = text;
  }

  setProjectName(name) {
    if (this.el.projectName) this.el.projectName.textContent = name;
  }

  setTreeStats(totalFiles, totalBytes) {
    const kb = Math.round((totalBytes || 0) / 1024);
    this.el.treeInfo.textContent = `Файлов: ${totalFiles || 0} • ${kb} KB`;
  }

  setApplyEnabled(enabled) {
    this.el.applyAccepted.disabled = !enabled;
  }

  setEditorEnabled(enabled) {
    this.el.fileEditor.readOnly = !enabled;
  }

  bindEditorInput(onInput) {
    this.el.fileEditor.oninput = () => onInput(this.el.fileEditor.value);
  }

  bindMarkdownToggle(onToggle) {
    this.el.mdToggleBtn.onclick = onToggle;
  }

  bindEditorActions(onSave, onClose) {
    this.el.saveFileBtn.onclick = onSave;
    this.el.closeFileBtn.onclick = onClose;
  }

  bindNewTextTab(onCreate) {
    this.el.newTextTabBtn.onclick = onCreate;
  }

  bindNewChatSession(onNewSession) {
    this.el.newChatSessionBtn.onclick = onNewSession;
  }

  clearChat() {
    this.el.chatLog.innerHTML = "";
  }

  setEditorActionsState({ hasFile, isDirty, infoText }) {
    this.el.saveFileBtn.disabled = !hasFile || !isDirty;
    this.el.closeFileBtn.disabled = !hasFile;
    this.el.editorInfo.textContent = infoText || "Файл не выбран";
  }

  setMarkdownToggleVisible(visible) {
    this.el.mdToggleBtn.classList.toggle("hidden", !visible);
    if (!visible) {
      this.el.mdPreview.classList.add("hidden");
      this.el.fileEditor.classList.remove("hidden");
    }
  }

  setMarkdownMode(mode) {
    const isPreview = mode === "preview";
    this.el.mdToggleBtn.classList.toggle("active", isPreview);
    this.el.mdToggleBtn.textContent = isPreview ? "✏️" : "👁";
    this.el.mdToggleBtn.title = isPreview ? "Перейти в редактирование" : "Перейти в просмотр";
    this.el.mdPreview.classList.toggle("hidden", !isPreview);
    this.el.fileEditor.classList.toggle("hidden", isPreview);
  }

  renderMarkdown(html) {
    this.el.mdPreview.innerHTML = html;
  }

  appendChat(role, text) {
    if (!["user", "assistant"].includes(role)) return;
    const div = document.createElement("div");
    div.className = "chat-entry";
    div.textContent = `[${role}] ${text}`;
    this.el.chatLog.appendChild(div);
    this.el.chatLog.scrollTop = this.el.chatLog.scrollHeight;
  }

  renderTree(rootNode, selectedPath, onSelect) {
    this.el.treeRoot.innerHTML = "";
    if (!rootNode) {
      this.el.treeRoot.textContent = "Директория не выбрана";
      return;
    }
    if (!rootNode.children?.length) {
      this.el.treeRoot.textContent = "В выбранной директории нет файлов";
      return;
    }

    const renderNode = (node, depth) => {
      const line = document.createElement("div");
      line.className = "tree-item";
      line.style.paddingLeft = `${depth * 14}px`;
      const marker = node.type === "dir" ? "📁" : "📄";
      const suffix = node.type === "file" && node.supported === false ? " (skip)" : "";
      line.textContent = `${marker} ${node.name}${suffix}`;
      if (node.path === selectedPath) line.style.fontWeight = "700";
      if (node.type === "file" && node.supported !== false) line.onclick = () => onSelect(node.path);
      this.el.treeRoot.appendChild(line);
      if (node.children) node.children.forEach((child) => renderNode(child, depth + 1));
    };

    renderNode(rootNode, 0);
  }

  renderFileTabs(openPaths, activePath, dirtyPaths, onTabClick, onCloseTab, onRenameTab) {
    this.el.fileTabs.innerHTML = "";
    for (const path of openPaths) {
      const tab = document.createElement("div");
      tab.className = `tab-item ${path === activePath ? "active" : ""} ${dirtyPaths.has(path) ? "dirty" : ""}`;
      tab.title = path;

      const openBtn = document.createElement("button");
      openBtn.className = "tab-main";
      openBtn.textContent = this.#formatTabLabel(path);
      openBtn.title = path;
      openBtn.onclick = () => onTabClick(path);
      openBtn.ondblclick = () => onRenameTab(path);

      const closeBtn = document.createElement("button");
      closeBtn.className = "tab-close";
      closeBtn.type = "button";
      closeBtn.textContent = "x";
      closeBtn.onclick = (event) => {
        event.stopPropagation();
        onCloseTab(path);
      };

      tab.append(openBtn, closeBtn);
      this.el.fileTabs.appendChild(tab);
    }
  }

  #formatTabLabel(path) {
    const normalized = (path || "").replaceAll("\\", "/");
    const baseName = normalized.includes("/") ? normalized.split("/").pop() : normalized;
    if (baseName.length <= 32) return baseName;
    return `${baseName.slice(0, 29)}...`;
  }

  renderFile(content) {
    this.el.fileEditor.value = content || "";
  }

  renderChanges(changes, activePath, onPick) {
    this.el.changeList.innerHTML = "";
    if (!changes.length) {
      this.el.toolbar.classList.add("hidden");
      this.el.diffView.innerHTML = "";
      return;
    }

    this.el.toolbar.classList.remove("hidden");
    for (const change of changes) {
      const review = this.reviewStore.get(change.path);
      const btn = document.createElement("button");
      btn.className = `change-btn ${change.path === activePath ? "active" : ""}`;
      btn.textContent = `${change.op} ${change.path} [${review?.status || "pending"}]`;
      btn.onclick = () => onPick(change.path);
      this.el.changeList.appendChild(btn);
    }
  }

  renderDiff(change, onToggleLine) {
    this.el.diffView.innerHTML = "";
    if (!change) return;
    const review = this.reviewStore.get(change.path);

    for (const op of change.diffOps) {
      const row = document.createElement("div");
      row.className = `diff-line ${op.kind}`;
      const marker = document.createElement("span");

      if (op.kind === "equal") marker.textContent = " ";
      else {
        const cb = document.createElement("input");
        cb.type = "checkbox";
        cb.checked = review?.stagedSelection?.has(op.id) || false;
        cb.onchange = () => onToggleLine(change.path, op.id);
        marker.appendChild(cb);
      }

      const text = document.createElement("span");
      if (op.kind === "add") text.textContent = `+ ${op.newLine}`;
      else if (op.kind === "remove") text.textContent = `- ${op.oldLine}`;
      else text.textContent = `  ${op.oldLine}`;

      row.append(marker, text);
      this.el.diffView.appendChild(row);
    }
  }
}