// MNote filetree keyboard 运行时外置模块。
// 承接 filetree keydown 处理和 clipboard 状态管理。
// inline script 保留完整 fallback。

// ─── Clipboard 状态 ─────────────────────────────────────

var sidebarFileTreeClipboard = null;

function getSidebarFileTreeClipboard() {
  return sidebarFileTreeClipboard;
}

function setSidebarFileTreeClipboard(action, rowIds) {
  sidebarFileTreeClipboard = { action: action, rowIds: rowIds };
  document.documentElement.setAttribute('data-mnote-filetree-clipboard-action', action);
  return sidebarFileTreeClipboard;
}

function clearSidebarFileTreeClipboard() {
  sidebarFileTreeClipboard = null;
  document.documentElement.removeAttribute('data-mnote-filetree-clipboard-action');
}

// ─── Keyboard handler ───────────────────────────────────

function handleFileTreeKeyDown(event, deps) {
  deps = deps || {};
  var closestAction = deps.closestAction || function() { return null; };
  var beginFileTreeInlineRename = deps.beginFileTreeInlineRename || function() {};
  var selectedSidebarFileTreeRows = deps.selectedSidebarFileTreeRows || function() { return []; };
  var buildSidebarFileTreeContext = deps.buildSidebarFileTreeContext || function() { return {}; };
  var evaluateSidebarFileTreeWhen = deps.evaluateSidebarFileTreeWhen || function() { return false; };
  var deleteSelectedSidebarFileTreeRows = deps.deleteSelectedSidebarFileTreeRows || function() { return Promise.resolve(); };

  var keyTarget = event.target;
  var fileTreeRootForKey = document.getElementById('sidebar-file-tree-root');
  var fileTreeRowForKey = closestAction(keyTarget, '.tree-row[data-shell-mode="filetree"]');
  if (!fileTreeRowForKey && fileTreeRootForKey && fileTreeRootForKey.contains(document.activeElement)) {
    fileTreeRowForKey = closestAction(document.activeElement, '.tree-row[data-shell-mode="filetree"]');
  }
  if (!fileTreeRowForKey) return false;

  if (event.key === 'F2') {
    event.preventDefault();
    var renameCtx = buildSidebarFileTreeContext('filetree', { targetRow: fileTreeRowForKey });
    if (!evaluateSidebarFileTreeWhen(renameCtx, '!workspace.readonly && !editor.dirty')) {
      return true;
    }
    beginFileTreeInlineRename(fileTreeRowForKey);
    return true;
  }

  if ((event.ctrlKey || event.metaKey) && !event.altKey && event.key) {
    var shortcutKey = event.key.toLowerCase();
    if (shortcutKey === 'c' || shortcutKey === 'x') {
      var selectedRows = selectedSidebarFileTreeRows();
      var selectedRowIds = selectedRows.map(function(row) {
        return row.getAttribute('data-row-id') || '';
      }).filter(Boolean);
      if (selectedRowIds.length > 0) {
        event.preventDefault();
        setSidebarFileTreeClipboard(shortcutKey === 'x' ? 'cut' : 'copy', selectedRowIds);
      }
      return true;
    }
    if (shortcutKey === 'v') {
      event.preventDefault();
      var pasteCtx = buildSidebarFileTreeContext('filetree', { targetRow: fileTreeRowForKey });
      if (!evaluateSidebarFileTreeWhen(pasteCtx, '!workspace.readonly')) {
        return true;
      }
      if (typeof deps.pasteSidebarFileTreeClipboard === 'function') {
        void deps.pasteSidebarFileTreeClipboard(fileTreeRowForKey);
      }
      return true;
    }
  }

  if (event.key === 'Delete' || event.key === 'Backspace') {
    event.preventDefault();
    var delCtx = buildSidebarFileTreeContext('filetree', { targetRow: fileTreeRowForKey });
    if (!evaluateSidebarFileTreeWhen(delCtx, '!workspace.readonly && !editor.dirty')) {
      return true;
    }
    void deleteSelectedSidebarFileTreeRows(fileTreeRowForKey);
    return true;
  }

  return false;
}

// ─── 导出 ───────────────────────────────────────────────

window.__mnoteFileTreeKeyboardRuntime = {
  sidebarFileTreeClipboard: sidebarFileTreeClipboard,
  getSidebarFileTreeClipboard: getSidebarFileTreeClipboard,
  setSidebarFileTreeClipboard: setSidebarFileTreeClipboard,
  clearSidebarFileTreeClipboard: clearSidebarFileTreeClipboard,
  handleFileTreeKeyDown: handleFileTreeKeyDown,
};