/**
 * Dashboard Page - 3-column layout with project folder tree, project cards, and info panel
 */
import { useState, useEffect, useCallback, useMemo } from 'react';
import { useAuth } from '../contexts/AuthContext';
import { NotificationPanel } from '../components/NotificationPanel';
import { ShareDialog } from '../components/ShareDialog';
import SettingsModal from '../components/SettingsModal';
import {
  getProjects, deleteProject, updateProject,
  getProjectFolders, createProjectFolder, renameProjectFolder, deleteProjectFolder,
  moveProjectToFolder, moveProjectFolder, getProjectShares, getUsers, createProjectShare,
  getDrawings, getElements,
  type Project, type ProjectFolder, type ProjectShare, type SimpleUser,
} from '../services/api';
import type { CADElement } from '../types/cad.types';

const API_BASE = import.meta.env.VITE_API_BASE || '';
const UNFILED_ID = '__unfiled__';

interface DashboardProps {
  onOpenProject: (projectId: string) => void;
}

/** Render a real SVG preview of a project's first drawing elements */
function CanvasPreview({ project, token }: { project: Project; token: string }) {
  const [elements, setElements] = useState<CADElement[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    let cancelled = false;
    async function loadPreview() {
      try {
        const drawings = await getDrawings(token, project.id);
        if (drawings.length === 0) { if (!cancelled) setElements([]); return; }
        const rawEls = await getElements(token, drawings[0].id);
        // API may return DBElement with properties_json (string) instead of properties (object)
        const transformed: CADElement[] = rawEls.map((el: any) => ({
          id: el.id,
          type: el.type,
          layerId: el.layer_id ?? el.layerId ?? '',
          x: el.x ?? 0,
          y: el.y ?? 0,
          width: el.width ?? 0,
          height: el.height ?? 0,
          properties: typeof el.properties_json === 'string' ? JSON.parse(el.properties_json || '{}') : (el.properties ?? {}),
        }));
        if (!cancelled) setElements(transformed);
      } catch {
        if (!cancelled) setElements([]);
      } finally {
        if (!cancelled) setLoading(false);
      }
    }
    loadPreview();
    return () => { cancelled = true; };
  }, [token, project.id]);

  // Compute bounding box of all elements for viewBox scaling
  const bbox = useMemo(() => {
    if (elements.length === 0) return null;
    let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
    for (const el of elements) {
      minX = Math.min(minX, el.x);
      minY = Math.min(minY, el.y);
      maxX = Math.max(maxX, el.x + el.width);
      maxY = Math.max(maxY, el.y + el.height);
    }
    return { minX, minY, w: Math.max(maxX - minX, 10), h: Math.max(maxY - minY, 10) };
  }, [elements]);

  const svgElements = useMemo(() => {
    if (!bbox || elements.length === 0) return [];
    return elements.slice(0, 50).map((el) => {
      const stroke = el.properties.stroke || '#60a5fa';
      const fill = el.properties.fill || 'none';
      const sw = Math.max((el.properties.strokeWidth || 1), 0.5);
      const x = el.x - bbox.minX;
      const y = el.y - bbox.minY;
      const w = el.width;
      const h = el.height;
      switch (el.type) {
        case 'rect':
        case 'table':
        case 'stage':
          return <rect key={el.id} x={x} y={y} width={w} height={h} fill={fill} stroke={stroke} strokeWidth={sw} />;
        case 'circle':
          return <circle key={el.id} cx={x + w/2} cy={y + h/2} r={Math.min(w, h)/2} fill={fill} stroke={stroke} strokeWidth={sw} />;
        case 'line':
        case 'leader':
          return <line key={el.id} x1={x} y1={y} x2={x + w} y2={y + h} stroke={stroke} strokeWidth={sw} />;
        case 'text':
          return <text key={el.id} x={x} y={y + Math.min(h, 10)} fontSize={Math.min(el.properties.fontSize || 8, 10)} fill={stroke}>{el.properties.text || ''}</text>;
        case 'polygon':
        case 'polyline':
          if (el.properties.points && el.properties.points.length > 1) {
            const pts = el.properties.points.map(p => `${p.x - bbox.minX},${p.y - bbox.minY}`).join(' ');
            return <polygon key={el.id} points={pts} fill={fill} stroke={stroke} strokeWidth={sw} />;
          }
          return null;
        case 'chair':
          return <circle key={el.id} cx={x + w/2} cy={y + h/2} r={Math.min(w, h)/2} fill={fill} stroke={stroke} strokeWidth={sw} />;
        case 'arc':
          return <path key={el.id} d={`M ${x} ${y+h/2} A ${w/2} ${h/2} 0 0 1 ${x+w} ${y+h/2}`} fill="none" stroke={stroke} strokeWidth={sw} />;
        default:
          return <rect key={el.id} x={x} y={y} width={w} height={h} fill="none" stroke={stroke} strokeWidth={sw} strokeDasharray="2,2" />;
      }
    });
  }, [elements, bbox]);

  return (
    <div className="dashboard-card-preview" title="Vorschau der Zeichenfläche">
      {loading ? (
        <div className="dashboard-preview-loading">...</div>
      ) : elements.length === 0 || !bbox ? (
        <svg viewBox="0 0 100 60" preserveAspectRatio="xMidYMid meet" className="dashboard-preview-svg">
          <rect x="0" y="0" width="100" height="60" fill="var(--color-canvas-bg-2, #1e293b)" />
          <text x="50" y="35" textAnchor="middle" fontSize="6" fill="#64748b">Leere Zeichnung</text>
        </svg>
      ) : (
        <svg viewBox={`${bbox.minX - 5} ${bbox.minY - 5} ${bbox.w + 10} ${bbox.h + 10}`} preserveAspectRatio="xMidYMid meet" className="dashboard-preview-svg">
          <rect x={bbox.minX - 5} y={bbox.minY - 5} width={bbox.w + 10} height={bbox.h + 10} fill="var(--color-canvas-bg-2, #1e293b)" />
          {svgElements}
        </svg>
      )}
    </div>
  );
}

export function Dashboard({ onOpenProject }: DashboardProps) {
  const { user, logout, token } = useAuth();
  const [projects, setProjects] = useState<Project[]>([]);
  const [allProjects, setAllProjects] = useState<Project[]>([]);
  const [folders, setFolders] = useState<ProjectFolder[]>([]);
  const [loading, setLoading] = useState(true);
  const [showCreate, setShowCreate] = useState(false);
  const [newName, setNewName] = useState('');
  const [newDesc, setNewDesc] = useState('');
  const [shareProjectId, setShareProjectId] = useState<string | null>(null);
  const [selectedFolderId, setSelectedFolderId] = useState<string | null>(null);
  const [selectedProjectId, setSelectedProjectId] = useState<string | null>(null);
  const [shares, setShares] = useState<ProjectShare[]>([]);
  const [sharesLoading, setSharesLoading] = useState(false);
  const [draggedProjectId, setDraggedProjectId] = useState<string | null>(null);
  const [draggedFolderId, setDraggedFolderId] = useState<string | null>(null);
  const [contextMenu, setContextMenu] = useState<{ x: number; y: number; folderId: string | null } | null>(null);
  const [renamingFolderId, setRenamingFolderId] = useState<string | null>(null);
  const [renameValue, setRenameValue] = useState('');
  const [showCreateFolder, setShowCreateFolder] = useState(false);
  const [newFolderName, setNewFolderName] = useState('');
  const [newFolderParent, setNewFolderParent] = useState<string | null>(null);
  const [editingProjectName, setEditingProjectName] = useState('');
  const [editingProjectDesc, setEditingProjectDesc] = useState('');
  const [savingProject, setSavingProject] = useState(false);
  const [dragOverFolderId, setDragOverFolderId] = useState<string | null>(null);
  const [expandedFolders, setExpandedFolders] = useState<Set<string>>(new Set());
  const [mobileTreeOpen, setMobileTreeOpen] = useState(false);
  const [mobileInfoOpen, setMobileInfoOpen] = useState(false);
  const [showSettings, setShowSettings] = useState(false);
  const [users, setUsers] = useState<SimpleUser[]>([]);
  const [usersLoading, setUsersLoading] = useState(false);

  const fetchAll = useCallback(async () => {
    if (!token) return;
    setLoading(true);
    try {
      const [projs, fldrs] = await Promise.all([
        getProjects(token),
        getProjectFolders(token),
      ]);
      setAllProjects(projs);
      setFolders(fldrs);
    } catch {
      // ignore
    } finally {
      setLoading(false);
    }
  }, [token]);

  useEffect(() => {
    fetchAll();
  }, [fetchAll]);

  // Default: expand all folders on first load or when folders change
  useEffect(() => {
    if (folders.length > 0 && expandedFolders.size === 0) {
      setExpandedFolders(new Set(folders.map(f => f.id)));
    }
  }, [folders, expandedFolders.size]);

  useEffect(() => {
    if (selectedFolderId === null) {
      setProjects(allProjects);
    } else if (selectedFolderId === UNFILED_ID) {
      setProjects(allProjects.filter(p => p.folder_id === null));
    } else {
      setProjects(allProjects.filter(p => p.folder_id === selectedFolderId));
    }
  }, [allProjects, selectedFolderId]);

  useEffect(() => {
    if (!token || !selectedProjectId) {
      setShares([]);
      return;
    }
    setSharesLoading(true);
    getProjectShares(token, selectedProjectId)
      .then(s => setShares(s))
      .catch(() => setShares([]))
      .finally(() => setSharesLoading(false));
  }, [token, selectedProjectId]);

  // Load users for permission selector (admin only)
  useEffect(() => {
    if (!token || user?.role !== 'admin') return;
    setUsersLoading(true);
    getUsers(token)
      .then(u => setUsers(u))
      .catch(() => setUsers([]))
      .finally(() => setUsersLoading(false));
  }, [token, user?.role]);

  const selectedProject = useMemo(
    () => allProjects.find(p => p.id === selectedProjectId) ?? null,
    [allProjects, selectedProjectId],
  );

  useEffect(() => {
    if (selectedProject) {
      setEditingProjectName(selectedProject.name);
      setEditingProjectDesc(selectedProject.description ?? '');
    }
  }, [selectedProject]);

  const folderNameById = useMemo(() => {
    const map = new Map<string, string>();
    map.set(UNFILED_ID, 'Ohne Ordner');
    for (const f of folders) map.set(f.id, f.name);
    return map;
  }, [folders]);

  const currentFolderName = useMemo(() => {
    if (selectedFolderId === null) return 'Alle Projekte';
    return folderNameById.get(selectedFolderId) ?? 'Projekte';
  }, [selectedFolderId, folderNameById]);

  const toggleFolder = (id: string) => {
    setExpandedFolders(prev => {
      const next = new Set(prev);
      if (next.has(id)) next.delete(id);
      else next.add(id);
      return next;
    });
  };

  const handleCreate = async () => {
    if (!newName.trim() || !token) return;
    try {
      const folderId = selectedFolderId === null || selectedFolderId === UNFILED_ID
        ? null : selectedFolderId;
      const res = await fetch(`${API_BASE}/api/projects`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${token}` },
        body: JSON.stringify({ name: newName, description: newDesc || null, folder_id: folderId }),
      });
      if (res.ok) {
        setNewName('');
        setNewDesc('');
        setShowCreate(false);
        fetchAll();
      }
    } catch {
      // ignore
    }
  };

  const handleDelete = async (id: string, e: React.MouseEvent) => {
    e.stopPropagation();
    if (!confirm('Projekt wirklich löschen?')) return;
    if (!token) return;
    try {
      await deleteProject(token, id);
      if (selectedProjectId === id) setSelectedProjectId(null);
      fetchAll();
    } catch {
      // ignore
    }
  };

  const handleFolderSelect = (id: string | null) => {
    setSelectedFolderId(id);
  };

  const handleCreateFolder = async () => {
    if (!newFolderName.trim() || !token) return;
    const parentId = newFolderParent === UNFILED_ID ? null : newFolderParent;
    try {
      await createProjectFolder(token, newFolderName, parentId);
      setNewFolderName('');
      setShowCreateFolder(false);
      setNewFolderParent(null);
      fetchAll();
    } catch {
      // ignore
    }
  };

  const handleRenameFolder = async (id: string) => {
    if (!renameValue.trim() || !token) return;
    try {
      await renameProjectFolder(token, id, renameValue);
      setRenamingFolderId(null);
      setRenameValue('');
      fetchAll();
    } catch {
      // ignore
    }
  };

  const handleDeleteFolder = async (id: string) => {
    if (!token) return;
    if (!confirm('Ordner löschen? Projekte darin werden nach "Ohne Ordner" verschoben.')) return;
    try {
      await deleteProjectFolder(token, id);
      if (selectedFolderId === id) setSelectedFolderId(null);
      fetchAll();
    } catch {
      // ignore
    }
  };

  const handleProjectCardClick = (projectId: string) => {
    setSelectedProjectId(projectId);
    setMobileInfoOpen(true);
    onOpenProject(projectId);
  };

  const handleSaveProject = async () => {
    if (!selectedProject || !token) return;
    if (!editingProjectName.trim()) return;
    setSavingProject(true);
    try {
      await updateProject(token, selectedProject.id, {
        name: editingProjectName.trim(),
        description: editingProjectDesc.trim() || null,
      });
      fetchAll();
    } catch {
      // ignore
    } finally {
      setSavingProject(false);
    }
  };

  const handleProjectDragStart = (e: React.DragEvent, projectId: string) => {
    setDraggedProjectId(projectId);
    setDraggedFolderId(null);
    e.dataTransfer.effectAllowed = 'move';
    e.dataTransfer.setData('text/plain', `project:${projectId}`);
  };

  const handleFolderDragStart = (e: React.DragEvent, folderId: string) => {
    setDraggedFolderId(folderId);
    setDraggedProjectId(null);
    e.dataTransfer.effectAllowed = 'move';
    e.dataTransfer.setData('text/plain', `folder:${folderId}`);
  };

  const handleFolderDragOver = (e: React.DragEvent, folderId: string | null) => {
    if (!draggedProjectId && !draggedFolderId) return;
    // Prevent dropping a folder into itself or its descendants
    if (draggedFolderId) {
      if (folderId === draggedFolderId) return;
      let current: string | null = folderId;
      while (current) {
        if (current === draggedFolderId) return; // target is a descendant of dragged
        const f = folders.find(fld => fld.id === current);
        current = f?.parent_id ?? null;
      }
    }
    e.preventDefault();
    e.dataTransfer.dropEffect = 'move';
    setDragOverFolderId(folderId);
  };

  const handleFolderDragLeave = (folderId: string | null) => {
    if (dragOverFolderId === folderId) {
      setDragOverFolderId(null);
    }
  };

  const handleFolderDrop = async (e: React.DragEvent, folderId: string | null) => {
    e.preventDefault();
    e.stopPropagation();
    const targetFolderId = folderId === UNFILED_ID ? null : folderId;

    if (draggedProjectId && token) {
      try {
        await moveProjectToFolder(token, draggedProjectId, targetFolderId);
        fetchAll();
      } catch {
        // ignore
      } finally {
        setDraggedProjectId(null);
        setDragOverFolderId(null);
      }
    } else if (draggedFolderId && token) {
      // Move folder into target folder (or to root if null)
      const folder = folders.find(f => f.id === draggedFolderId);
      if (folder && folder.id !== targetFolderId && folder.parent_id !== targetFolderId) {
        try {
          await moveProjectFolder(token, draggedFolderId, targetFolderId, folder.name);
          // Auto-expand target if it has children now
          if (targetFolderId) {
            setExpandedFolders(prev => new Set([...prev, targetFolderId]));
          }
          fetchAll();
        } catch {
          // ignore
        } finally {
          setDraggedFolderId(null);
          setDragOverFolderId(null);
        }
      } else {
        setDraggedFolderId(null);
        setDragOverFolderId(null);
      }
    }
  };

  const handleContextMenu = (e: React.MouseEvent, folderId: string | null) => {
    e.preventDefault();
    e.stopPropagation();
    setContextMenu({ x: e.clientX, y: e.clientY, folderId });
  };

  const handleContextAction = (action: string, folderId: string | null) => {
    setContextMenu(null);
    if (action === 'new') {
      setNewFolderParent(folderId);
      setShowCreateFolder(true);
    } else if (action === 'newSubfolder' && folderId) {
      setNewFolderParent(folderId);
      setShowCreateFolder(true);
    } else if (action === 'rename' && folderId) {
      const folder = folders.find(f => f.id === folderId);
      if (folder) {
        setRenamingFolderId(folderId);
        setRenameValue(folder.name);
      }
    } else if (action === 'delete' && folderId) {
      handleDeleteFolder(folderId);
    }
  };

  const formatDate = (dateStr: string) => {
    return new Date(dateStr).toLocaleDateString('de-DE', {
      year: 'numeric', month: 'long', day: 'numeric',
      hour: '2-digit', minute: '2-digit',
    });
  };

  const folderIcon = (
    <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
      <path d="M3 7a2 2 0 0 1 2-2h4l2 2h7a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z" />
    </svg>
  );

  const renderFolderItem = (folder: ProjectFolder, depth: number): React.ReactNode => {
    const children = folders.filter(f => f.parent_id === folder.id);
    const isExpanded = expandedFolders.has(folder.id);
    const projectCount = allProjects.filter(p => p.folder_id === folder.id).length;
    const isSelected = selectedFolderId === folder.id;
    const isDragOver = dragOverFolderId === folder.id;
    const isRenaming = renamingFolderId === folder.id;
    const isDragging = draggedFolderId === folder.id;

    return (
      <div key={folder.id} className={isDragging ? 'tree-dragging' : ''}>
        <div
          className={`folder-tree-item${isSelected ? ' selected' : ''}${isDragOver ? ' drag-over' : ''}`}
          draggable
          onDragStart={(e) => handleFolderDragStart(e, folder.id)}
          onDragOver={(e) => handleFolderDragOver(e, folder.id)}
          onDragLeave={() => handleFolderDragLeave(folder.id)}
          onDrop={(e) => handleFolderDrop(e, folder.id)}
          onClick={() => handleFolderSelect(folder.id)}
          onContextMenu={(e) => handleContextMenu(e, folder.id)}
          style={{ paddingLeft: `${depth * 16 + 8}px` }}
        >
          {children.length > 0 ? (
            <button
              className="folder-chevron"
              onClick={(e) => { e.stopPropagation(); toggleFolder(folder.id); }}
              aria-label={isExpanded ? 'Einklappen' : 'Ausklappen'}
            >
              {isExpanded ? '▼' : '▶'}
            </button>
          ) : (
            <span className="folder-chevron-placeholder" />
          )}
          {folderIcon}
          {isRenaming ? (
            <input
              className="folder-rename-inline"
              type="text"
              value={renameValue}
              onChange={e => setRenameValue(e.target.value)}
              onKeyDown={e => {
                if (e.key === 'Enter') handleRenameFolder(folder.id);
                if (e.key === 'Escape') { setRenamingFolderId(null); setRenameValue(''); }
              }}
              onBlur={() => {
                if (renameValue.trim()) handleRenameFolder(folder.id);
                else { setRenamingFolderId(null); setRenameValue(''); }
              }}
              onClick={e => e.stopPropagation()}
              autoFocus
            />
          ) : (
            <span className="folder-tree-name">{folder.name}</span>
          )}
          {projectCount > 0 && <span className="folder-count">({projectCount})</span>}
          {!isRenaming && (
            <span className="folder-action-buttons">
              <button
                className="folder-action-btn"
                title="Umbenennen"
                onClick={(e) => {
                  e.stopPropagation();
                  setRenamingFolderId(folder.id);
                  setRenameValue(folder.name);
                }}
              >✎</button>
              <button
                className="folder-action-btn delete"
                title="Löschen"
                onClick={(e) => {
                  e.stopPropagation();
                  handleDeleteFolder(folder.id);
                }}
              >✕</button>
            </span>
          )}
        </div>
        {isExpanded && children.map(child => renderFolderItem(child, depth + 1))}
      </div>
    );
  };

  // Shared users from shares data
  const sharedUserEmails = useMemo(() => shares.map(s => s.shared_with_email), [shares]);

  return (
    <div className="dashboard-page">
      <header className="dashboard-header">
        <div className="dashboard-brand">
          <button className="dashboard-hamburger" aria-label="Ordner" onClick={() => setMobileTreeOpen(true)}>
            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2"><line x1="3" y1="6" x2="21" y2="6"/><line x1="3" y1="12" x2="21" y2="12"/><line x1="3" y1="18" x2="21" y2="18"/></svg>
          </button>
          <h1 className="dashboard-title-large">Web CAD</h1>
          <span className="dashboard-user">{user?.name} ({user?.role})</span>
        </div>
        <div className="dashboard-header-actions">
          {token && <NotificationPanel token={token} />}
          <button
            className="dashboard-settings-btn"
            aria-label="Einstellungen"
            title="Einstellungen"
            onClick={() => setShowSettings(true)}
          >
            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
              <circle cx="12" cy="12" r="3"/>
              <path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"/>
            </svg>
          </button>
          <button className="dashboard-logout" onClick={logout}>Abmelden</button>
        </div>
      </header>

      {(mobileTreeOpen || mobileInfoOpen) && (
        <div className="dashboard-scrim" onClick={() => { setMobileTreeOpen(false); setMobileInfoOpen(false); }} />
      )}
      <div className="dashboard-3col">
        <div className={`dashboard-treeview${mobileTreeOpen ? ' mobile-open' : ''}`} onContextMenu={(e) => handleContextMenu(e, null)}>
          <button className="mobile-panel-close" onClick={() => setMobileTreeOpen(false)}>×</button>
          <div className="treeview-header">
            <h3>Ordner</h3>
            <button
              className="treeview-add-folder-btn"
              title="Neuer Ordner"
              onClick={() => { setNewFolderParent(null); setShowCreateFolder(true); }}
            >+</button>
          </div>

          {showCreateFolder && (
            <div className="folder-create-form">
              <input
                type="text"
                placeholder={newFolderParent ? 'Unterordnername' : 'Ordnername'}
                value={newFolderName}
                onChange={e => setNewFolderName(e.target.value)}
                onKeyDown={e => { if (e.key === 'Enter') handleCreateFolder(); if (e.key === 'Escape') setShowCreateFolder(false); }}
                autoFocus
              />
              <div className="folder-create-actions">
                <button onClick={handleCreateFolder}>OK</button>
                <button onClick={() => { setShowCreateFolder(false); setNewFolderName(''); setNewFolderParent(null); }}>×</button>
              </div>
            </div>
          )}

          {/* Root: Alle Projekte */}
          <div
            className={`folder-tree-item${selectedFolderId === null ? ' selected' : ''}${dragOverFolderId === null && (draggedProjectId || draggedFolderId) ? ' drag-over' : ''}`}
            onClick={() => handleFolderSelect(null)}
            onDragOver={(e) => handleFolderDragOver(e, null)}
            onDragLeave={() => handleFolderDragLeave(null)}
            onDrop={(e) => handleFolderDrop(e, null)}
            onContextMenu={(e) => handleContextMenu(e, null)}
            style={{ paddingLeft: '8px' }}
          >
            <span className="folder-chevron-placeholder" />
            {folderIcon}
            <span className="folder-tree-name">Alle Projekte</span>
            <span className="folder-count">({allProjects.length})</span>
          </div>

          {/* Ohne Ordner node */}
          <div
            className={`folder-tree-item${selectedFolderId === UNFILED_ID ? ' selected' : ''}${dragOverFolderId === UNFILED_ID ? ' drag-over' : ''}`}
            onClick={() => handleFolderSelect(UNFILED_ID)}
            onDragOver={(e) => handleFolderDragOver(e, UNFILED_ID)}
            onDragLeave={() => handleFolderDragLeave(UNFILED_ID)}
            onDrop={(e) => handleFolderDrop(e, UNFILED_ID)}
            onContextMenu={(e) => handleContextMenu(e, null)}
            style={{ paddingLeft: '24px' }}
          >
            <span className="folder-chevron-placeholder" />
            {folderIcon}
            <span className="folder-tree-name">Ohne Ordner</span>
            <span className="folder-count">({allProjects.filter(p => p.folder_id === null).length})</span>
          </div>

          {/* Top-level folders rendered recursively */}
          {folders.filter(f => !f.parent_id).map(folder => renderFolderItem(folder, 1))}
        </div>

        <div className="dashboard-content">
          <div className="dashboard-section-header">
            <h2>{currentFolderName}</h2>
            <button className="dashboard-create-btn" onClick={() => setShowCreate(!showCreate)}>
              + Neues Projekt
            </button>
          </div>

          {showCreate && (
            <div className="dashboard-create-form">
              <input
                type="text"
                placeholder="Projektname"
                value={newName}
                onChange={e => setNewName(e.target.value)}
                onKeyDown={e => { if (e.key === 'Enter') handleCreate(); }}
                autoFocus
              />
              <input
                type="text"
                placeholder="Beschreibung (optional)"
                value={newDesc}
                onChange={e => setNewDesc(e.target.value)}
                onKeyDown={e => { if (e.key === 'Enter') handleCreate(); }}
              />
              <button onClick={handleCreate}>Erstellen</button>
              <button onClick={() => setShowCreate(false)}>Abbrechen</button>
            </div>
          )}

          {loading ? (
            <p className="dashboard-loading">Lade Projekte...</p>
          ) : projects.length === 0 ? (
            <p className="dashboard-empty">Keine Projekte in dieser Ansicht. Erstellen Sie ein neues Projekt.</p>
          ) : (
            <div className="dashboard-project-grid">
              {projects.map(project => (
                <div
                  key={project.id}
                  className={`dashboard-project-card${selectedProjectId === project.id ? ' selected' : ''}`}
                  onClick={() => handleProjectCardClick(project.id)}
                  draggable
                  onDragStart={(e) => handleProjectDragStart(e, project.id)}
                  onDragEnd={() => { setDraggedProjectId(null); setDragOverFolderId(null); }}
                >
                  <CanvasPreview project={project} token={token!} />
                  <h3 className="dashboard-card-title">{project.name}</h3>
                  {project.description && <p className="dashboard-card-desc">{project.description}</p>}
                  <div className="dashboard-project-meta">
                    <span>{new Date(project.created_at).toLocaleDateString('de-DE')}</span>
                    <div className="dashboard-project-actions">
                      <button
                        className="dashboard-icon-btn"
                        title="Öffnen"
                        aria-label="Öffnen"
                        onClick={(e) => { e.stopPropagation(); onOpenProject(project.id); }}
                      >
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M14 3v5h5"/><path d="M21 21H3V3h11l7 7v11z"/><path d="M9 13l2 2 4-4"/></svg>
                      </button>
                      <button
                        className="dashboard-icon-btn"
                        title="Teilen"
                        aria-label="Teilen"
                        onClick={(e) => { e.stopPropagation(); setShareProjectId(project.id); }}
                      >
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><circle cx="18" cy="5" r="3"/><circle cx="6" cy="12" r="3"/><circle cx="18" cy="19" r="3"/><line x1="8.59" y1="13.51" x2="15.42" y2="17.49"/><line x1="15.41" y1="6.51" x2="8.59" y2="10.49"/></svg>
                      </button>
                      <button
                        className="dashboard-icon-btn dashboard-icon-btn-danger"
                        title="Löschen"
                        aria-label="Löschen"
                        onClick={(e) => handleDelete(project.id, e)}
                      >
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><polyline points="3 6 5 6 21 6"/><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/></svg>
                      </button>
                    </div>
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>

        <div className={`dashboard-info-panel${mobileInfoOpen ? ' mobile-open' : ''}`}>
          <button className="mobile-panel-back" onClick={() => setMobileInfoOpen(false)}>← Zurück</button>
          {selectedProject ? (
            <>
              <input
                className="info-panel-title-input info-panel-title-small"
                type="text"
                value={editingProjectName}
                onChange={(e) => setEditingProjectName(e.target.value)}
                placeholder="Projektname"
              />
              <textarea
                className="info-panel-desc-textarea info-panel-desc-tall"
                value={editingProjectDesc}
                onChange={(e) => setEditingProjectDesc(e.target.value)}
                placeholder="Beschreibung (optional)"
                rows={8}
              />
              <button
                className="info-panel-save-btn"
                onClick={handleSaveProject}
                disabled={savingProject || !editingProjectName.trim()}
              >
                {savingProject ? 'Speichern...' : 'Speichern'}
              </button>
              <div className="info-panel-section">
                <h4>Metadaten</h4>
                <dl className="info-panel-meta">
                  <dt>Erstellt</dt>
                  <dd>{formatDate(selectedProject.created_at)}</dd>
                  <dt>Aktualisiert</dt>
                  <dd>{formatDate(selectedProject.updated_at)}</dd>
                  <dt>Owner</dt>
                  <dd>{selectedProject.owner_id}</dd>
                  <dt>Ordner</dt>
                  <dd>{selectedProject.folder_id ? (folderNameById.get(selectedProject.folder_id) ?? 'Unbekannt') : 'Ohne Ordner'}</dd>
                </dl>
              </div>
              <div className="info-panel-section">
                <h4>Sichtbarkeit / Freigaben</h4>
                {sharesLoading ? (
                  <p className="info-panel-loading">Lade Freigaben...</p>
                ) : shares.length === 0 ? (
                  <p className="info-panel-empty">Keine Freigaben</p>
                ) : (
                  <ul className="info-panel-shares">
                    {shares.map(share => (
                      <li key={share.id} className="info-panel-share-item">
                        <span className="info-panel-share-email">{share.shared_with_email}</span>
                        <span className="info-panel-share-perm">{share.permission}</span>
                      </li>
                    ))}
                  </ul>
                )}
              </div>
              <div className="info-panel-section">
                <h4>Berechtigungen verwalten</h4>
                <p className="info-panel-perm-hint">Wählen Sie, welcher User oder welche Gruppe das Projekt sehen darf:</p>
                {usersLoading ? (
                  <p className="info-panel-loading">Lade Benutzer...</p>
                ) : users.length === 0 ? (
                  <p className="info-panel-empty">Benutzerliste nur für Administratoren sichtbar</p>
                ) : (
                  <div className="info-panel-perm-selector">
                    <select className="info-panel-perm-select" defaultValue="">
                      <option value="" disabled>— User auswählen —</option>
                      {users
                        .filter(u => u.id !== selectedProject.owner_id)
                        .filter(u => !sharedUserEmails.includes(u.email))
                        .map(u => (
                          <option key={u.id} value={u.email}>{u.name} ({u.email})</option>
                        ))
                      }
                    </select>
                    <select className="info-panel-perm-type" defaultValue="view">
                      <option value="view">Ansehen</option>
                      <option value="edit">Bearbeiten</option>
                    </select>
                    <button
                      className="info-panel-perm-add-btn"
                      onClick={async () => {
                        const sel = document.querySelector<HTMLSelectElement>('.info-panel-perm-select');
                        const permSel = document.querySelector<HTMLSelectElement>('.info-panel-perm-type');
                        const email = sel?.value;
                        const perm = permSel?.value || 'view';
                        if (!email || !token) return;
                        try {
                          await createProjectShare(token, selectedProject.id, { shared_with_email: email, permission: perm });
                          if (sel) sel.value = '';
                          getProjectShares(token, selectedProject.id)
                            .then(s => setShares(s))
                            .catch(() => {});
                        } catch {
                          // ignore
                        }
                      }}
                    >Hinzufügen</button>
                  </div>
                )}
              </div>
              <button
                className="info-panel-open-btn"
                onClick={() => onOpenProject(selectedProject.id)}
              >
                Projekt öffnen
              </button>
            </>
          ) : (
            <div className="info-panel-placeholder">
              <p>Wählen Sie ein Projekt aus, um Details zu sehen.</p>
            </div>
          )}
        </div>
      </div>

      {contextMenu && (
        <>
          <div className="context-menu-overlay" onClick={() => setContextMenu(null)} />
          <div
            className="context-menu"
            style={{ left: contextMenu.x, top: contextMenu.y }}
          >
            <button
              className="context-menu-item"
              onClick={() => handleContextAction('new', contextMenu.folderId)}
            >Neuer Ordner</button>
            {contextMenu.folderId && (
              <button
                className="context-menu-item"
                onClick={() => handleContextAction('newSubfolder', contextMenu.folderId)}
              >Neuer Unterordner</button>
            )}
            {contextMenu.folderId && (
              <>
                <button
                  className="context-menu-item"
                  onClick={() => handleContextAction('rename', contextMenu.folderId)}
                >Umbenennen</button>
                <button
                  className="context-menu-item danger"
                  onClick={() => handleContextAction('delete', contextMenu.folderId)}
                >Löschen</button>
              </>
            )}
          </div>
        </>
      )}

      {token && (
        <ShareDialog
          token={token}
          projectId={shareProjectId ?? ''}
          open={!!shareProjectId}
          onClose={() => setShareProjectId(null)}
        />
      )}

      <SettingsModal
        open={showSettings}
        onClose={() => setShowSettings(false)}
      />
    </div>
  );
}