refactor: Extract utilities and fix Ant Design message context warnings

- Extract ad utilities to separate files for better code organization
  - Create adUtils.js with generateAdId, copy/refresh handlers
  - Create zoomUtils.js with useZoomState custom hook
  - Create tabUtils.js with buildTabsFromCategories function
- Replace static message API with App.useApp() hook to fix context warnings
- Implement factory pattern for utility functions with callback support
- Improve code separation, testability and maintainability
- Remove direct antd context dependencies from utility functions

Components now follow single responsibility principle with clean separation
between business logic and UI concerns.

frontend/src/pages/ProjectDetail.js

@@ -1,26 +1,16 @@
 import React, { useEffect, useState } from 'react';
 import { useParams, useNavigate } from 'react-router-dom';
-import { Tabs, Button, Spin, Skeleton, Result, Grid, Select, Layout, Tooltip, message } from 'antd';
-import { ArrowLeftOutlined, LoadingOutlined, LockOutlined, MinusOutlined, PlusOutlined, EllipsisOutlined, ShareAltOutlined, ReloadOutlined } from '@ant-design/icons';
+import { Tabs, Button, Spin, Skeleton, Result, Grid, Select, Layout, App } from 'antd';
+import { ArrowLeftOutlined, LoadingOutlined, LockOutlined, MinusOutlined, PlusOutlined, EllipsisOutlined } from '@ant-design/icons';
 import UserMenu from '../components/UserMenu';
-import FilePreview, { formatFileSize, formatDuration } from '../components/FilePreview';
+import { useZoomState } from '../utils/zoomUtils';
+import { scrollToAnchor, createCopyLinkHandler, createRefreshAdHandler } from '../utils/adUtils';
+import { buildTabsFromCategories } from '../utils/tabUtils';
 import debugLogger from '../utils/debugLogger';
 
 const backendUrl = process.env.REACT_APP_BACKEND || '';
 const { useBreakpoint } = Grid;
 
-// Hash-Funktion für Ad-IDs
-function generateAdId(adName, subcategoryName, categoryName) {
-  const combined = `${categoryName}-${subcategoryName}-${adName}`;
-  let hash = 0;
-  for (let i = 0; i < combined.length; i++) {
-    const char = combined.charCodeAt(i);
-    hash = ((hash << 5) - hash) + char;
-    hash = hash & hash; // 32-bit integer
-  }
-  return Math.abs(hash).toString(36); // Base36 für kürzere IDs
-}
-
 function ProjectDetail({ user, darkMode, onLogout, onToggleDarkMode, overrideParams, ...props }) {
   // URL-Parameter holen, mit Override-Support für Smart Resolution
   const routeParams = useParams();
@@ -46,70 +36,20 @@ function ProjectDetail({ user, darkMode, onLogout, onToggleDarkMode, overridePar
   // Hole Projekt-Logo (und ggf. weitere Metadaten)
   const [projectLogo, setProjectLogo] = useState(null);
 
-  // Zoom-Logik (muss im Component-Scope stehen, nicht in useEffect!)
-  const ZOOM_LEVELS = [0.15, 0.25, 0.5, 0.75, 1];
-  const [zoom, setZoom] = useState(() => {
-    const z = parseFloat(localStorage.getItem('adsZoom') || '1');
-    return ZOOM_LEVELS.includes(z) ? z : 1;
-  });
-  function handleZoom(dir) {
-    setZoom(z => {
-      const idx = ZOOM_LEVELS.indexOf(z);
-      let next = z;
-      if (dir === 'in') next = ZOOM_LEVELS[Math.min(ZOOM_LEVELS.length - 1, idx + 1)];
-      if (dir === 'out') next = ZOOM_LEVELS[Math.max(0, idx - 1)];
-      localStorage.setItem('adsZoom', next);
-      return next;
-    });
-  }
+  // Zoom-Logik mit Custom Hook
+  const { zoom, handleZoom, ZOOM_LEVELS } = useZoomState();
+
+  // Message-Hook aus App-Kontext
+  const { message } = App.useApp();
+
+  // Handler für Ad-Aktionen mit Message-Callbacks
+  const handleCopyLink = createCopyLinkHandler((msg) => message.success(msg));
+  const handleRefreshAd = createRefreshAdHandler(
+    (msg) => message.success(msg),
+    (msg) => message.info(msg)
+  );
 
-  // Link kopieren Funktionalität
-  const handleCopyLink = async (adId, adName) => {
-    try {
-      // Entferne bestehende Sprungmarke aus der URL
-      const currentUrl = window.location.href;
-      const baseUrl = currentUrl.split('#')[0]; // Alles vor dem ersten #
-      const linkWithAnchor = `${baseUrl}#${adId}`;
-      await navigator.clipboard.writeText(linkWithAnchor);
-      message.success(`Link zu "${adName}" wurde kopiert!`);
-    } catch (err) {
-      // Fallback für ältere Browser
-      const textArea = document.createElement('textarea');
-      const baseUrl = window.location.href.split('#')[0];
-      textArea.value = `${baseUrl}#${adId}`;
-      document.body.appendChild(textArea);
-      textArea.select();
-      document.execCommand('copy');
-      document.body.removeChild(textArea);
-      message.success(`Link zu "${adName}" wurde kopiert!`);
-    }
-  };
 
-  // iFrame Refresh Funktionalität
-  const handleRefreshAd = (adId, adName) => {
-    // Finde alle iFrames innerhalb des Ad-Containers
-    const adContainer = document.getElementById(adId);
-    if (adContainer) {
-      const iframes = adContainer.querySelectorAll('iframe');
-      let refreshedCount = 0;
-      
-      iframes.forEach((iframe) => {
-        if (iframe.src) {
-          // Füge einen Timestamp als URL-Parameter hinzu, um den Cache zu umgehen
-          const url = new URL(iframe.src);
-          url.searchParams.set('refresh', Date.now().toString());
-          iframe.src = url.toString();
-          refreshedCount++;
-        }
-      });
-      
-      if (refreshedCount > 0) {
-        message.success(`Animation${refreshedCount > 1 ? 'en' : ''} "${adName}" ${refreshedCount > 1 ? 'wurden' : 'wurde'} neu geladen!`);
-      } else {
-        message.info(`Keine Animationen in "${adName}" gefunden.`);
-      }
-    }
-  };
 
   useEffect(() => {
     async function fetchLogo() {
@@ -144,78 +84,10 @@ function ProjectDetail({ user, darkMode, onLogout, onToggleDarkMode, overridePar
   // Tabs mit useMemo erstellen, damit sie sich bei Zoom-Änderung aktualisieren ohne API-Call
   const tabs = React.useMemo(() => {
     if (!tabsData) return [];
-    return buildTabsFromCategories(tabsData);
-  }, [tabsData, zoom]);
+    return buildTabsFromCategories(tabsData, zoom, darkMode, handleCopyLink, handleRefreshAd);
+  }, [tabsData, zoom, darkMode, handleCopyLink, handleRefreshAd]);
+
 
-  function buildTabsFromCategories(data) {
-    let categories = [];
-    if (Array.isArray(data)) {
-      categories = data.filter(child => child.type === 'category');
-    } else if (data && Array.isArray(data.children)) {
-      categories = data.children.filter(child => child.type === 'category');
-    }
-    return categories.map(cat => ({
-      key: cat.title,
-      label: cat.title,
-      children: (
-        <div>
-          {Array.isArray(cat.children) && cat.children.filter(sub => sub.type === 'subcategory').length > 0 ? (
-            cat.children.filter(sub => sub.type === 'subcategory').map(sub => (
-              <div key={sub.name} style={{ marginTop: 24 }}>
-                <h2 style={{ marginBottom: 4 }}>{sub.name}</h2>
-                {/* Ads unterhalb der Subcategory anzeigen */}
-                {Array.isArray(sub.children) && sub.children.filter(ad => ad.type === 'ad').length > 0 ? (
-                  sub.children.filter(ad => ad.type === 'ad').map(ad => {
-                    const adId = generateAdId(ad.name, sub.name, cat.title);
-                    return (
-                      <div key={ad.name} id={adId} style={{ marginLeft: 0, marginBottom: 16 }}>
-                        <div style={{ color: '#555', fontSize: 15, display: 'flex', alignItems: 'center', gap: 8 }}>
-                          {ad.name}
-                          <Tooltip title="Link kopieren">
-                            <Button 
-                              type="text" 
-                              shape="circle" 
-                              icon={<ShareAltOutlined />} 
-                              onClick={() => handleCopyLink(adId, ad.name)}
-                            />
-                          </Tooltip>
-                          {/* Refresh-Button nur bei HTML-Dateien (iFrames) anzeigen */}
-                          {Array.isArray(ad.files) && ad.files.some(file => file.type === 'html') && (
-                            <Tooltip title="Animationen neu laden">
-                              <Button 
-                                type="text" 
-                                shape="circle" 
-                                icon={<ReloadOutlined />} 
-                                onClick={() => handleRefreshAd(adId, ad.name)}
-                              />
-                            </Tooltip>
-                          )}
-                        </div>
-                      {/* Dateien unterhalb des Ads anzeigen */}
-                      {Array.isArray(ad.files) && ad.files.length > 0 ? (
-                        <div style={{ marginLeft: 0, display: 'flex', flexWrap: 'wrap', gap: 32 }}>
-                          {ad.files.map(file => (
-                            <FilePreview key={file.name + '__' + zoom} file={file} zoom={zoom} darkMode={darkMode} />
-                          ))}
-                        </div>
-                      ) : (
-                        <div style={{ color: '#bbb', marginLeft: 16, fontSize: 13 }}>Keine Dateien vorhanden.</div>
-                      )}
-                    </div>
-                    );
-                  })
-                ) : (
-                  <div style={{ color: '#aaa', marginLeft: 16, fontSize: 14 }}>Keine Ads vorhanden.</div>
-                )}
-              </div>
-            ))
-          ) : (
-            <div style={{ color: '#888', marginTop: 16 }}>Keine Subkategorien vorhanden.</div>
-          )}
-        </div>
-      )
-    }));
-  }
 
   useEffect(() => {
     // Wenn Routing-Parameter fehlen, Tabs zurücksetzen
@@ -320,25 +192,7 @@ function ProjectDetail({ user, darkMode, onLogout, onToggleDarkMode, overridePar
   useEffect(() => {
     if (!loading && tabs.length > 0) {
       const hash = window.location.hash.substring(1);
-      if (hash) {
-        // Kurz warten bis die Inhalte gerendert sind
-        setTimeout(() => {
-          const element = document.getElementById(hash);
-          if (element) {
-            // Scroll mit Offset, um Navigation zu berücksichtigen
-            const elementTop = element.offsetTop - 20;
-            window.scrollTo({
-              top: elementTop,
-              behavior: 'smooth'
-            });
-            // Kurz hervorheben
-            element.style.backgroundColor = '#edff5f';
-            setTimeout(() => {
-              element.style.backgroundColor = '';
-            }, 2000);
-          }
-        }, 300);
-      }
+      scrollToAnchor(hash, 20);
     }
   }, [loading, tabs, activeKey]);
 

frontend/src/utils/adUtils.js

@@ -0,0 +1,82 @@
+// Hash-Funktion für Ad-IDs
+export function generateAdId(adName, subcategoryName, categoryName) {
+  const combined = `${categoryName}-${subcategoryName}-${adName}`;
+  let hash = 0;
+  for (let i = 0; i < combined.length; i++) {
+    const char = combined.charCodeAt(i);
+    hash = ((hash << 5) - hash) + char;
+    hash = hash & hash; // 32-bit integer
+  }
+  return Math.abs(hash).toString(36); // Base36 für kürzere IDs
+}
+
+// Link kopieren Funktionalität
+export const createCopyLinkHandler = (onSuccess) => async (adId, adName) => {
+  try {
+    // Entferne bestehende Sprungmarke aus der URL
+    const currentUrl = window.location.href;
+    const baseUrl = currentUrl.split('#')[0]; // Alles vor dem ersten #
+    const linkWithAnchor = `${baseUrl}#${adId}`;
+    await navigator.clipboard.writeText(linkWithAnchor);
+    onSuccess(`Link zu "${adName}" wurde kopiert!`);
+  } catch (err) {
+    // Fallback für ältere Browser
+    const textArea = document.createElement('textarea');
+    const baseUrl = window.location.href.split('#')[0];
+    textArea.value = `${baseUrl}#${adId}`;
+    document.body.appendChild(textArea);
+    textArea.select();
+    document.execCommand('copy');
+    document.body.removeChild(textArea);
+    onSuccess(`Link zu "${adName}" wurde kopiert!`);
+  }
+};
+
+// iFrame Refresh Funktionalität
+export const createRefreshAdHandler = (onSuccess, onInfo) => (adId, adName) => {
+  // Finde alle iFrames innerhalb des Ad-Containers
+  const adContainer = document.getElementById(adId);
+  if (adContainer) {
+    const iframes = adContainer.querySelectorAll('iframe');
+    let refreshedCount = 0;
+    
+    iframes.forEach((iframe) => {
+      if (iframe.src) {
+        // Füge einen Timestamp als URL-Parameter hinzu, um den Cache zu umgehen
+        const url = new URL(iframe.src);
+        url.searchParams.set('refresh', Date.now().toString());
+        iframe.src = url.toString();
+        refreshedCount++;
+      }
+    });
+    
+    if (refreshedCount > 0) {
+      onSuccess(`Animation${refreshedCount > 1 ? 'en' : ''} "${adName}" ${refreshedCount > 1 ? 'wurden' : 'wurde'} neu geladen!`);
+    } else {
+      onInfo(`Keine Animationen in "${adName}" gefunden.`);
+    }
+  }
+};
+
+// Scroll zu Sprungmarke mit Offset
+export const scrollToAnchor = (hash, offset = 20) => {
+  if (hash) {
+    // Kurz warten bis die Inhalte gerendert sind
+    setTimeout(() => {
+      const element = document.getElementById(hash);
+      if (element) {
+        // Scroll mit Offset, um Navigation zu berücksichtigen
+        const elementTop = element.offsetTop - offset;
+        window.scrollTo({
+          top: elementTop,
+          behavior: 'smooth'
+        });
+        // Kurz hervorheben
+        element.style.backgroundColor = '#edff5f';
+        setTimeout(() => {
+          element.style.backgroundColor = '';
+        }, 2000);
+      }
+    }, 300);
+  }
+};

frontend/src/utils/tabUtils.js

@@ -0,0 +1,77 @@
+import React from 'react';
+import { Button, Tooltip } from 'antd';
+import { ShareAltOutlined, ReloadOutlined } from '@ant-design/icons';
+import FilePreview from '../components/FilePreview';
+import { generateAdId } from './adUtils';
+
+// Tabs aus Kategorien-Daten erstellen
+export const buildTabsFromCategories = (data, zoom, darkMode, handleCopyLink, handleRefreshAd) => {
+  let categories = [];
+  if (Array.isArray(data)) {
+    categories = data.filter(child => child.type === 'category');
+  } else if (data && Array.isArray(data.children)) {
+    categories = data.children.filter(child => child.type === 'category');
+  }
+  
+  return categories.map(cat => ({
+    key: cat.title,
+    label: cat.title,
+    children: (
+      <div>
+        {Array.isArray(cat.children) && cat.children.filter(sub => sub.type === 'subcategory').length > 0 ? (
+          cat.children.filter(sub => sub.type === 'subcategory').map(sub => (
+            <div key={sub.name} style={{ marginTop: 24 }}>
+              <h2 style={{ marginBottom: 4 }}>{sub.name}</h2>
+              {/* Ads unterhalb der Subcategory anzeigen */}
+              {Array.isArray(sub.children) && sub.children.filter(ad => ad.type === 'ad').length > 0 ? (
+                sub.children.filter(ad => ad.type === 'ad').map(ad => {
+                  const adId = generateAdId(ad.name, sub.name, cat.title);
+                  return (
+                    <div key={ad.name} id={adId} style={{ marginLeft: 0, marginBottom: 16 }}>
+                      <div style={{ color: '#555', fontSize: 15, display: 'flex', alignItems: 'center', gap: 8 }}>
+                        {ad.name}
+                        <Tooltip title="Link kopieren">
+                          <Button 
+                            type="text" 
+                            shape="circle" 
+                            icon={<ShareAltOutlined />} 
+                            onClick={() => handleCopyLink(adId, ad.name)}
+                          />
+                        </Tooltip>
+                        {/* Refresh-Button nur bei HTML-Dateien (iFrames) anzeigen */}
+                        {Array.isArray(ad.files) && ad.files.some(file => file.type === 'html') && (
+                          <Tooltip title="Animationen neu laden">
+                            <Button 
+                              type="text" 
+                              shape="circle" 
+                              icon={<ReloadOutlined />} 
+                              onClick={() => handleRefreshAd(adId, ad.name)}
+                            />
+                          </Tooltip>
+                        )}
+                      </div>
+                      {/* Dateien unterhalb des Ads anzeigen */}
+                      {Array.isArray(ad.files) && ad.files.length > 0 ? (
+                        <div style={{ marginLeft: 0, display: 'flex', flexWrap: 'wrap', gap: 32 }}>
+                          {ad.files.map(file => (
+                            <FilePreview key={file.name + '__' + zoom} file={file} zoom={zoom} darkMode={darkMode} />
+                          ))}
+                        </div>
+                      ) : (
+                        <div style={{ color: '#bbb', marginLeft: 16, fontSize: 13 }}>Keine Dateien vorhanden.</div>
+                      )}
+                    </div>
+                  );
+                })
+              ) : (
+                <div style={{ color: '#aaa', marginLeft: 16, fontSize: 14 }}>Keine Ads vorhanden.</div>
+              )}
+            </div>
+          ))
+        ) : (
+          <div style={{ color: '#888', marginTop: 16 }}>Keine Subkategorien vorhanden.</div>
+        )}
+      </div>
+    )
+  }));
+};

frontend/src/utils/zoomUtils.js

@@ -0,0 +1,29 @@
+import { useState } from 'react';
+
+// Zoom-Levels Konstante
+export const ZOOM_LEVELS = [0.15, 0.25, 0.5, 0.75, 1];
+
+// Zoom-State Hook
+export const useZoomState = () => {
+  const [zoom, setZoom] = useState(() => {
+    const z = parseFloat(localStorage.getItem('adsZoom') || '1');
+    return ZOOM_LEVELS.includes(z) ? z : 1;
+  });
+
+  const handleZoom = (direction) => {
+    setZoom(currentZoom => {
+      const idx = ZOOM_LEVELS.indexOf(currentZoom);
+      let nextZoom = currentZoom;
+      if (direction === 'in') {
+        nextZoom = ZOOM_LEVELS[Math.min(ZOOM_LEVELS.length - 1, idx + 1)];
+      }
+      if (direction === 'out') {
+        nextZoom = ZOOM_LEVELS[Math.max(0, idx - 1)];
+      }
+      localStorage.setItem('adsZoom', nextZoom);
+      return nextZoom;
+    });
+  };
+
+  return { zoom, handleZoom, ZOOM_LEVELS };
+};