feat: treeview with folders, toolbar, file attachments in chat

frontend/src/api/ai.ts

@@ -61,6 +61,14 @@ export interface AIAgent {
   updated_at?: string;
 }
 
+export interface ChatFolder {
+  id: string;
+  name: string;
+  parent_id: string | null;
+  user_id: string;
+  created_at?: string;
+}
+
 export interface ChatSession {
   id: string;
   user_id: string;
@@ -68,6 +76,7 @@ export interface ChatSession {
   title: string;
   is_pinned: boolean;
   is_sidebar: boolean;
+  folder_id: string | null;
   created_at?: string;
   updated_at?: string;
 }
@@ -84,6 +93,15 @@ export interface ChatMessage {
   created_at?: string;
 }
 
+export interface ChatAttachment {
+  id: string;
+  message_id: string | null;
+  session_id: string;
+  filename: string;
+  mime_type: string;
+  size_bytes: number;
+}
+
 export interface AITool {
   name: string;
   description: string;
@@ -126,11 +144,18 @@ export const deleteAgent = (id: string) => apiDelete(`/ai/agents/${id}`);
 
 export const fetchTools = () => apiGet<AITool[]>('/ai/tools');
 
+// ─── Folders ───
+
+export const fetchFolders = () => apiGet<ChatFolder[]>('/ai/folders');
+export const createFolder = (data: { name: string; parent_id?: string }) => apiPost<ChatFolder>('/ai/folders', data);
+export const updateFolder = (id: string, data: Partial<ChatFolder>) => apiPut<ChatFolder>(`/ai/folders/${id}`, data);
+export const deleteFolder = (id: string) => apiDelete(`/ai/folders/${id}`);
+
 // ─── Sessions ───
 
 export const fetchSessions = (isSidebar?: boolean) =>
   apiGet<ChatSession[]>('/ai/sessions', { params: isSidebar !== undefined ? { is_sidebar: isSidebar } : {} });
-export const createSession = (data: { title?: string; agent_id?: string; is_sidebar?: boolean }) =>
+export const createSession = (data: { title?: string; agent_id?: string; is_sidebar?: boolean; folder_id?: string }) =>
   apiPost<ChatSession>('/ai/sessions', data);
 export const updateSession = (id: string, data: Partial<ChatSession>) =>
   apiPut<ChatSession>(`/ai/sessions/${id}`, data);
@@ -141,6 +166,31 @@ export const deleteSession = (id: string) => apiDelete(`/ai/sessions/${id}`);
 export const fetchMessages = (sessionId: string) =>
   apiGet<ChatMessage[]>(`/ai/sessions/${sessionId}/messages`);
 
+// ─── Attachments ───
+
+export const fetchAttachments = (sessionId: string) =>
+  apiGet<ChatAttachment[]>(`/ai/sessions/${sessionId}/attachments`);
+
+export async function uploadAttachment(sessionId: string, file: File): Promise<ChatAttachment> {
+  const formData = new FormData();
+  formData.append('file', file);
+  const csrfToken = sessionStorage.getItem('leocrm_csrf_token');
+  const response = await fetch(`/api/v1/ai/sessions/${sessionId}/attachments`, {
+    method: 'POST',
+    headers: {
+      ...(csrfToken ? { 'X-CSRF-Token': csrfToken } : {}),
+    },
+    credentials: 'include',
+    body: formData,
+  });
+  if (!response.ok) throw new Error(`Upload failed: ${response.status}`);
+  return response.json();
+}
+
+export function getAttachmentDownloadUrl(attachmentId: string): string {
+  return `/api/v1/ai/attachments/${attachmentId}/download`;
+}
+
 // ─── Streaming Chat ───
 
 export interface StreamEvent {

frontend/src/components/ai/ChatWindow.tsx

@@ -1,6 +1,9 @@
 import React, { useState, useRef, useEffect } from 'react';
 import clsx from 'clsx';
-import { streamChat, fetchMessages, type ChatMessage } from '@/api/ai';
+import {
+  streamChat, fetchMessages, fetchAttachments, uploadAttachment, getAttachmentDownloadUrl,
+  type ChatMessage, type ChatAttachment,
+} from '@/api/ai';
 
 interface ChatWindowProps {
   sessionId: string;
@@ -9,23 +12,33 @@ interface ChatWindowProps {
   compact?: boolean;
 }
 
+function formatSize(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+}
+
 export function ChatWindow({ sessionId, agentId, className, compact }: ChatWindowProps) {
   const [messages, setMessages] = useState<ChatMessage[]>([]);
+  const [attachments, setAttachments] = useState<ChatAttachment[]>([]);
   const [input, setInput] = useState('');
   const [isStreaming, setIsStreaming] = useState(false);
   const [streamingContent, setStreamingContent] = useState('');
   const [toolStatus, setToolStatus] = useState<string | null>(null);
   const [error, setError] = useState<string | null>(null);
+  const [pendingFiles, setPendingFiles] = useState<File[]>([]);
+  const [uploadingFile, setUploadingFile] = useState(false);
   const scrollRef = useRef<HTMLDivElement>(null);
   const inputRef = useRef<HTMLTextAreaElement>(null);
+  const fileInputRef = useRef<HTMLInputElement>(null);
 
   useEffect(() => {
     if (!sessionId) return;
     setMessages([]);
+    setAttachments([]);
     setError(null);
-    fetchMessages(sessionId)
-      .then((msgs) => setMessages(msgs))
-      .catch((e) => setError(e?.message || 'Failed to load messages'));
+    fetchMessages(sessionId).then(setMessages).catch((e) => setError(e?.message || 'Failed to load messages'));
+    fetchAttachments(sessionId).then(setAttachments).catch(() => {});
   }, [sessionId]);
 
   useEffect(() => {
@@ -34,6 +47,23 @@ export function ChatWindow({ sessionId, agentId, className, compact }: ChatWindo
     }
   }, [messages, streamingContent]);
 
+  const handleFileSelect = async (e: React.ChangeEvent<HTMLInputElement>) => {
+    const files = Array.from(e.target.files || []);
+    if (files.length === 0) return;
+    setUploadingFile(true);
+    try {
+      for (const file of files) {
+        const att = await uploadAttachment(sessionId, file);
+        setAttachments((prev) => [...prev, att]);
+      }
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Upload failed');
+    } finally {
+      setUploadingFile(false);
+      if (fileInputRef.current) fileInputRef.current.value = '';
+    }
+  };
+
   const handleSend = async () => {
     const content = input.trim();
     if (!content || isStreaming) return;
@@ -94,6 +124,30 @@ export function ChatWindow({ sessionId, agentId, className, compact }: ChatWindo
 
   return (
     <div className={clsx('flex flex-col h-full bg-white', className)}>
+      {/* Attachments bar */}
+      {attachments.length > 0 && (
+        <div className={clsx('border-b border-secondary-200 bg-secondary-50', compact ? 'px-2 py-1' : 'px-4 py-2')}>
+          <div className="flex flex-wrap gap-2">
+            {attachments.map((att) => (
+              <a
+                key={att.id}
+                href={getAttachmentDownloadUrl(att.id)}
+                target="_blank"
+                rel="noopener noreferrer"
+                className="flex items-center gap-1.5 rounded-md bg-white border border-secondary-200 px-2 py-1 text-xs hover:border-primary-400"
+              >
+                <svg className="w-3.5 h-3.5 text-secondary-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15.172 7l-6.586 6.586a2 2 0 102.828 2.828l6.414-6.586a4 4 0 00-5.656-5.656l-6.415 6.585a6 6 0 108.486 8.486L20.5 13" />
+                </svg>
+                <span className="max-w-32 truncate">{att.filename}</span>
+                <span className="text-secondary-400">{formatSize(att.size_bytes)}</span>
+              </a>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Messages */}
       <div ref={scrollRef} className={clsx('flex-1 overflow-y-auto', compact ? 'p-3' : 'p-6')}>
         {messages.length === 0 && !streamingContent && !error && (
           <div className="flex items-center justify-center h-full text-secondary-400 text-sm">
@@ -128,8 +182,27 @@ export function ChatWindow({ sessionId, agentId, className, compact }: ChatWindo
           </div>
         )}
       </div>
+
+      {/* Input */}
       <div className={clsx('border-t border-secondary-200', compact ? 'p-2' : 'p-4')}>
         <div className="flex items-end gap-2">
+          <input
+            ref={fileInputRef}
+            type="file"
+            multiple
+            onChange={handleFileSelect}
+            className="hidden"
+          />
+          <button
+            onClick={() => fileInputRef.current?.click()}
+            disabled={uploadingFile || isStreaming}
+            className="rounded-lg border border-secondary-300 p-2 text-secondary-500 hover:bg-secondary-100 disabled:opacity-50"
+            title="Datei anhängen"
+          >
+            <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15.172 7l-6.586 6.586a2 2 0 102.828 2.828l6.414-6.586a4 4 0 00-5.656-5.656l-6.415 6.585a6 6 0 108.486 8.486L20.5 13" />
+            </svg>
+          </button>
           <textarea
             ref={inputRef}
             value={input}

frontend/src/components/ai/SessionList.tsx

@@ -1,6 +1,10 @@
 import React, { useEffect, useState } from 'react';
 import clsx from 'clsx';
-import { fetchSessions, createSession, deleteSession, updateSession, type ChatSession } from '@/api/ai';
+import {
+  fetchSessions, createSession, deleteSession, updateSession,
+  fetchFolders, createFolder, deleteFolder, updateFolder,
+  type ChatSession, type ChatFolder,
+} from '@/api/ai';
 
 interface SessionListProps {
   activeSessionId: string | null;
@@ -9,27 +13,160 @@ interface SessionListProps {
   className?: string;
 }
 
+interface TreeNode {
+  folder: ChatFolder | null;
+  sessions: ChatSession[];
+  children: TreeNode[];
+}
+
+function buildTree(folders: ChatFolder[], sessions: ChatSession[]): TreeNode[] {
+  const rootSessions = sessions.filter((s) => !s.folder_id);
+  const root: TreeNode = { folder: null, sessions: rootSessions, children: [] };
+
+  const folderMap = new Map<string, TreeNode>();
+  for (const f of folders) {
+    folderMap.set(f.id, { folder: f, sessions: [], children: [] });
+  }
+
+  for (const f of folders) {
+    const node = folderMap.get(f.id)!;
+    if (f.parent_id && folderMap.has(f.parent_id)) {
+      folderMap.get(f.parent_id)!.children.push(node);
+    } else {
+      root.children.push(node);
+    }
+  }
+
+  for (const s of sessions) {
+    if (s.folder_id && folderMap.has(s.folder_id)) {
+      folderMap.get(s.folder_id)!.sessions.push(s);
+    }
+  }
+
+  return [root];
+}
+
+function TreeItem({
+  node, activeSessionId, onSelectSession, depth, onMoveSession, onDeleteFolder, onAddFolder,
+}: {
+  node: TreeNode;
+  activeSessionId: string | null;
+  onSelectSession: (id: string) => void;
+  depth: number;
+  onMoveSession: (sessionId: string, folderId: string | null) => void;
+  onDeleteFolder: (folderId: string) => void;
+  onAddFolder: (parentId: string | null) => void;
+}) {
+  const [expanded, setExpanded] = useState(true);
+  const isRoot = node.folder === null;
+
+  return (
+    <div>
+      {/* Folder header */}
+      {!isRoot && (
+        <div
+          className="group flex items-center gap-1 px-2 py-1.5 text-sm font-medium text-secondary-700 hover:bg-secondary-100 rounded-md cursor-pointer"
+          style={{ paddingLeft: depth * 12 + 8 }}
+          onClick={() => setExpanded(!expanded)}
+        >
+          <svg className={clsx('w-4 h-4 transition-transform', expanded && 'rotate-90')} fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
+          </svg>
+          <svg className="w-4 h-4 text-secondary-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z" />
+          </svg>
+          <span className="flex-1 truncate">{node.folder!.name}</span>
+          <button
+            onClick={(e) => { e.stopPropagation(); onAddFolder(node.folder!.id); }}
+            className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-primary-600"
+            title="Unterordner"
+          >+</button>
+          <button
+            onClick={(e) => { e.stopPropagation(); onDeleteFolder(node.folder!.id); }}
+            className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-red-600"
+            title="Löschen"
+          >✕</button>
+        </div>
+      )}
+
+      {/* Sessions in this folder */}
+      {(isRoot || expanded) && (
+        <div>
+          {node.sessions.map((session) => (
+            <div
+              key={session.id}
+              onClick={() => onSelectSession(session.id)}
+              className={clsx(
+                'group flex items-center gap-2 px-3 py-1.5 text-sm cursor-pointer rounded-md',
+                'hover:bg-secondary-100',
+                activeSessionId === session.id && 'bg-primary-100 text-primary-700'
+              )}
+              style={{ paddingLeft: depth * 12 + 24 }}
+            >
+              <svg className="w-3.5 h-3.5 text-secondary-400 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 12h8M8 8h8m-8 4h8m-8 4h8" />
+              </svg>
+              <span className="flex-1 truncate">{session.title}</span>
+              <button
+                onClick={(e) => {
+                  e.stopPropagation();
+                  const folderId = node.folder?.id || null;
+                  onMoveSession(session.id, folderId ? null : 'root');
+                }}
+                className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-primary-600"
+                title="Verschieben"
+              >↦</button>
+              <button
+                onClick={(e) => { e.stopPropagation(); deleteSession(session.id).then(() => window.location.reload()); }}
+                className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-red-600"
+                title="Löschen"
+              >✕</button>
+            </div>
+          ))}
+        </div>
+      )}
+
+      {/* Child folders */}
+      {(isRoot || expanded) && node.children.map((child) => (
+        <TreeItem
+          key={child.folder!.id}
+          node={child}
+          activeSessionId={activeSessionId}
+          onSelectSession={onSelectSession}
+          depth={depth + 1}
+          onMoveSession={onMoveSession}
+          onDeleteFolder={onDeleteFolder}
+          onAddFolder={onAddFolder}
+        />
+      ))}
+    </div>
+  );
+}
+
 export function SessionList({ activeSessionId, onSelectSession, isSidebar, className }: SessionListProps) {
   const [sessions, setSessions] = useState<ChatSession[]>([]);
+  const [folders, setFolders] = useState<ChatFolder[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
 
-  const loadSessions = async () => {
+  const loadData = async () => {
     try {
       setLoading(true);
-      const data = await fetchSessions(isSidebar ? true : undefined);
-      setSessions(data);
+      const [s, f] = await Promise.all([
+        fetchSessions(isSidebar ? true : undefined),
+        fetchFolders(),
+      ]);
+      setSessions(s);
+      setFolders(f);
       setError(null);
     } catch (e) {
-      setError(e instanceof Error ? e.message : 'Failed to load sessions');
+      setError(e instanceof Error ? e.message : 'Failed to load');
     } finally {
       setLoading(false);
     }
   };
 
-  useEffect(() => {
-    loadSessions();
-  }, [isSidebar]);
+  useEffect(() => { loadData(); }, [isSidebar]);
 
   const handleNewChat = async () => {
     try {
@@ -41,62 +178,64 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
     }
   };
 
-  const handleDelete = async (id: string, e: React.MouseEvent) => {
-    e.stopPropagation();
+  const handleAddFolder = (parentId: string | null) => {
+    const name = prompt('Ordnername:');
+    if (!name) return;
+    createFolder({ name, parent_id: parentId || undefined })
+      .then(() => loadData())
+      .catch((e) => setError(e?.message));
+  };
+
+  const handleDeleteFolder = (folderId: string) => {
+    if (!confirm('Ordner löschen? Chats bleiben erhalten.')) return;
+    deleteFolder(folderId).then(() => loadData()).catch((e) => setError(e?.message));
+  };
+
+  const handleMoveSession = async (sessionId: string, target: string) => {
+    const folderId = target === 'root' ? null : target;
     try {
-      await deleteSession(id);
-      setSessions((prev) => prev.filter((s) => s.id !== id));
-      if (activeSessionId === id) {
-        onSelectSession('');
-      }
+      await updateSession(sessionId, { folder_id: folderId });
+      loadData();
     } catch (e) {
-      setError(e instanceof Error ? e.message : 'Failed to delete session');
+      setError(e instanceof Error ? e.message : 'Failed to move');
     }
   };
 
-  if (loading) {
-    return <div className="p-4 text-sm text-secondary-400">Laden...</div>;
-  }
+  if (loading) return <div className="p-4 text-sm text-secondary-400">Laden...</div>;
+
+  const tree = buildTree(folders, sessions);
 
   return (
     <div className={clsx('flex flex-col h-full', className)}>
-      <div className="p-3 border-b border-secondary-200">
+      <div className="p-3 border-b border-secondary-200 flex gap-2">
         <button
           onClick={handleNewChat}
-          className="w-full rounded-lg bg-primary-600 text-white px-3 py-2 text-sm font-medium hover:bg-primary-700"
+          className="flex-1 rounded-lg bg-primary-600 text-white px-3 py-2 text-sm font-medium hover:bg-primary-700"
         >
           + Neuer Chat
         </button>
+        <button
+          onClick={() => handleAddFolder(null)}
+          className="rounded-lg border border-secondary-300 px-3 py-2 text-sm hover:bg-secondary-100"
+          title="Neuer Ordner"
+        >
+          📁+
+        </button>
       </div>
       {error && <div className="p-2 text-xs text-red-600">{error}</div>}
-      <div className="flex-1 overflow-y-auto">
-        {sessions.length === 0 ? (
-          <div className="p-4 text-sm text-secondary-400 text-center">Keine Chats vorhanden</div>
-        ) : (
-          <ul className="space-y-1 p-2">
-            {sessions.map((session) => (
-              <li key={session.id}>
-                <div
-                  onClick={() => onSelectSession(session.id)}
-                  className={clsx(
-                    'group flex items-center gap-2 rounded-lg px-3 py-2 text-sm cursor-pointer',
-                    'hover:bg-secondary-100',
-                    activeSessionId === session.id && 'bg-primary-100 text-primary-700'
-                  )}
-                >
-                  <span className="flex-1 truncate">{session.title}</span>
-                  <button
-                    onClick={(e) => handleDelete(session.id, e)}
-                    className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-red-600"
-                    title="Loeschen"
-                  >
-                    ✕
-                  </button>
-                </div>
-              </li>
-            ))}
-          </ul>
-        )}
+      <div className="flex-1 overflow-y-auto p-2">
+        {tree.map((node) => (
+          <TreeItem
+            key={node.folder?.id || 'root'}
+            node={node}
+            activeSessionId={activeSessionId}
+            onSelectSession={onSelectSession}
+            depth={0}
+            onMoveSession={handleMoveSession}
+            onDeleteFolder={handleDeleteFolder}
+            onAddFolder={handleAddFolder}
+          />
+        ))}
       </div>
     </div>
   );

frontend/src/pages/AIAssistant.tsx

@@ -1,13 +1,43 @@
-import React, { useState } from 'react';
+import React, { useState, useEffect } from 'react';
 import { SessionList } from '@/components/ai/SessionList';
 import { ChatWindow } from '@/components/ai/ChatWindow';
+import { usePluginToolbarStore } from '@/store/pluginToolbarStore';
+import { fetchAgents, type AIAgent } from '@/api/ai';
 
 export function AIAssistantPage() {
   const [activeSessionId, setActiveSessionId] = useState<string | null>(null);
+  const [agents, setAgents] = useState<AIAgent[]>([]);
+  const [selectedAgentId, setSelectedAgentId] = useState<string | null>(null);
+  const { registerItems, unregisterPlugin } = usePluginToolbarStore();
+
+  useEffect(() => {
+    fetchAgents().then(setAgents).catch(() => {});
+  }, []);
+
+  useEffect(() => {
+    registerItems('ai_assistant', [
+      {
+        id: 'agent-select',
+        label: 'Agent',
+        type: 'select',
+        options: agents.map((a) => ({ value: a.id, label: a.name })),
+        value: selectedAgentId || '',
+        onChange: (val: string) => setSelectedAgentId(val || null),
+      },
+      {
+        id: 'new-chat',
+        label: 'Neuer Chat',
+        type: 'button',
+        onClick: () => setActiveSessionId(null),
+      },
+    ]);
+
+    return () => unregisterPlugin('ai_assistant');
+  }, [agents, selectedAgentId, registerItems, unregisterPlugin]);
 
   return (
     <div className="flex h-full" data-testid="ai-assistant-page">
-      {/* Left: Session List */}
+      {/* Left: Session List with TreeView */}
       <div className="w-72 flex-shrink-0 border-r border-secondary-200 bg-white">
         <div className="h-16 flex items-center px-6 border-b border-secondary-200">
           <h1 className="text-lg font-bold text-secondary-900">KI Assistent</h1>
@@ -21,7 +51,7 @@ export function AIAssistantPage() {
       {/* Right: Chat Window */}
       <div className="flex-1 flex flex-col">
         {activeSessionId ? (
-          <ChatWindow sessionId={activeSessionId} className="flex-1" />
+          <ChatWindow sessionId={activeSessionId} agentId={selectedAgentId} className="flex-1" />
         ) : (
           <div className="flex-1 flex items-center justify-center text-secondary-400">
             <div className="text-center">