Feat: Offline-Funktionalität mit IndexedDB implementiert

app.py

@@ -1,4 +1,4 @@
-from flask import Flask, render_template, request, jsonify, url_for, redirect, session
+from flask import Flask, render_template, request, jsonify, url_for, redirect, session, make_response, send_from_directory
 import pandas as pd
 import os
 import logging
@@ -320,6 +320,43 @@ def search():
         logger.error(f'Fehler bei der Suche: {str(e)}')
         return jsonify({"error": str(e)}), 500
 
+@app.route('/sw.js')
+def sw():
+    response = make_response(send_from_directory('static', 'sw.js'))
+    response.headers['Content-Type'] = 'application/javascript'
+    return response
+
+@app.route('/offline')
+def offline():
+    return render_template('offline.html')
+
+@app.route('/api/search', methods=['POST'])
+def api_search():
+    """API-Endpunkt für die Kundensuche"""
+    try:
+        search_params = request.get_json()
+        results = search_customers(search_params)
+        return jsonify(results)
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/customers')
+def api_customers():
+    """API-Endpunkt für alle Kunden"""
+    try:
+        conn = sqlite3.connect(DB_FILE)
+        c = conn.cursor()
+        c.execute('SELECT * FROM customers')
+        columns = [description[0] for description in c.description]
+        results = []
+        for row in c.fetchall():
+            customer = dict(zip(columns, row))
+            results.append(customer)
+        conn.close()
+        return jsonify(results)
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
 def init_app(app):
     """Initialisiert die Anwendung mit allen notwendigen Einstellungen."""
     with app.app_context():

scripts/generate_icons.py

@@ -0,0 +1,39 @@
+from PIL import Image, ImageDraw, ImageFont
+import os
+
+def create_icon(size):
+    # Erstelle ein neues Bild mit grünem Hintergrund
+    image = Image.new('RGB', (size, size), '#4CAF50')
+    draw = ImageDraw.Draw(image)
+    
+    # Versuche, eine Schriftart zu laden
+    try:
+        font = ImageFont.truetype("arial.ttf", size // 3)
+    except:
+        font = ImageFont.load_default()
+    
+    # Text "MEDI" zeichnen
+    text = "MEDI"
+    text_bbox = draw.textbbox((0, 0), text, font=font)
+    text_width = text_bbox[2] - text_bbox[0]
+    text_height = text_bbox[3] - text_bbox[1]
+    x = (size - text_width) // 2
+    y = (size - text_height) // 2
+    draw.text((x, y), text, fill='white', font=font)
+    
+    # Speichere das Icon
+    output_file = f'static/images/icon-{size}x{size}.png'
+    image.save(output_file, 'PNG')
+    print(f'Icon {size}x{size} generiert: {output_file}')
+
+def main():
+    # Erstelle das Verzeichnis, falls es nicht existiert
+    os.makedirs('static/images', exist_ok=True)
+    
+    # Generiere Icons in verschiedenen Größen
+    sizes = [192, 512]
+    for size in sizes:
+        create_icon(size)
+
+if __name__ == '__main__':
+    main() 

static/css/styles.css

@@ -254,3 +254,81 @@ body {
     cursor: pointer;
     user-select: none;
 }
+
+/* Offline-Indikator */
+.offline-indicator {
+    position: fixed;
+    bottom: 20px;
+    right: 20px;
+    background-color: #ff9800;
+    color: white;
+    padding: 10px 20px;
+    border-radius: 5px;
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
+    z-index: 1000;
+}
+
+.offline-icon {
+    font-size: 1.2em;
+}
+
+/* Synchronisations-Status */
+.sync-status {
+    position: fixed;
+    bottom: 20px;
+    right: 20px;
+    background-color: #4CAF50;
+    color: white;
+    padding: 10px 20px;
+    border-radius: 5px;
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
+    z-index: 1000;
+}
+
+.sync-icon {
+    font-size: 1.2em;
+    animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+    from { transform: rotate(0deg); }
+    to { transform: rotate(360deg); }
+}
+
+/* Offline-Modus Styling */
+body.offline {
+    filter: grayscale(20%);
+}
+
+body.offline .search-container {
+    opacity: 0.9;
+}
+
+body.offline .footer::after {
+    content: "Offline-Modus";
+    display: block;
+    text-align: center;
+    color: #ff9800;
+    font-size: 0.8em;
+    margin-top: 5px;
+}
+
+/* Offline-Fallback für Bilder */
+.offline img {
+    opacity: 0.8;
+}
+
+/* Verbesserte Sichtbarkeit im Offline-Modus */
+.offline .search-field input {
+    background-color: rgba(255, 255, 255, 0.9);
+}
+
+.offline .result-count {
+    color: #666;
+} 

static/images/icon.svg

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="512" height="512" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
+    <!-- Hintergrund -->
+    <rect width="512" height="512" fill="#4CAF50"/>
+    
+    <!-- MEDI Text -->
+    <text x="256" y="300" 
+          font-family="Arial, sans-serif" 
+          font-size="200" 
+          font-weight="bold" 
+          fill="white" 
+          text-anchor="middle">
+        MEDI
+    </text>
+    
+    <!-- Herz-Symbol -->
+    <path d="M256 150 
+             C 256 150, 200 100, 150 100 
+             C 100 100, 50 150, 50 200 
+             C 50 250, 256 350, 256 350 
+             C 256 350, 462 250, 462 200 
+             C 462 150, 412 100, 362 100 
+             C 312 100, 256 150, 256 150" 
+          fill="white"/>
+</svg> 

static/js/db.js

@@ -0,0 +1,144 @@
+// IndexedDB Konfiguration
+const DB_NAME = 'mediCustomersDB';
+const DB_VERSION = 1;
+const STORE_NAME = 'customers';
+
+// Datenbank initialisieren
+const initDB = () => {
+    return new Promise((resolve, reject) => {
+        const request = indexedDB.open(DB_NAME, DB_VERSION);
+        
+        request.onerror = () => {
+            console.error('Fehler beim Öffnen der Datenbank:', request.error);
+            reject(request.error);
+        };
+        
+        request.onsuccess = () => {
+            console.log('Datenbank erfolgreich geöffnet');
+            resolve(request.result);
+        };
+        
+        request.onupgradeneeded = (event) => {
+            const db = event.target.result;
+            if (!db.objectStoreNames.contains(STORE_NAME)) {
+                const store = db.createObjectStore(STORE_NAME, { keyPath: 'nummer' });
+                // Indizes für die Suche erstellen
+                store.createIndex('name', 'name', { unique: false });
+                store.createIndex('ort', 'ort', { unique: false });
+                store.createIndex('plz', 'plz', { unique: false });
+                store.createIndex('fachrichtung', 'fachrichtung', { unique: false });
+            }
+        };
+    });
+};
+
+// Kunden in IndexedDB speichern
+const saveCustomers = async (customers) => {
+    const db = await initDB();
+    const tx = db.transaction(STORE_NAME, 'readwrite');
+    const store = tx.objectStore(STORE_NAME);
+    
+    return Promise.all(customers.map(customer => {
+        return new Promise((resolve, reject) => {
+            const request = store.put(customer);
+            request.onsuccess = () => resolve();
+            request.onerror = () => reject(request.error);
+        });
+    }));
+};
+
+// Kunden aus IndexedDB suchen
+const searchCustomersOffline = async (searchParams) => {
+    const db = await initDB();
+    const tx = db.transaction(STORE_NAME, 'readonly');
+    const store = tx.objectStore(STORE_NAME);
+    
+    return new Promise((resolve, reject) => {
+        const request = store.getAll();
+        
+        request.onsuccess = () => {
+            let results = request.result;
+            
+            // Filtern basierend auf den Suchparametern
+            if (searchParams.q) {
+                const searchTerms = searchParams.q.toLowerCase().split(' ');
+                const operator = searchParams.operator || 'or';
+                
+                results = results.filter(customer => {
+                    const searchableText = `${customer.name} ${customer.ort} ${customer.nummer} ${customer.plz} ${customer.fachrichtung}`.toLowerCase();
+                    
+                    if (operator === 'and') {
+                        return searchTerms.every(term => searchableText.includes(term));
+                    } else {
+                        return searchTerms.some(term => searchableText.includes(term));
+                    }
+                });
+            }
+            
+            // Spezifische Feldsuche
+            if (searchParams.name) {
+                results = results.filter(c => c.name.toLowerCase().includes(searchParams.name.toLowerCase()));
+            }
+            if (searchParams.ort) {
+                results = results.filter(c => c.ort.toLowerCase().includes(searchParams.ort.toLowerCase()));
+            }
+            if (searchParams.nummer) {
+                results = results.filter(c => c.nummer.toString().includes(searchParams.nummer));
+            }
+            if (searchParams.plz) {
+                results = results.filter(c => c.plz.includes(searchParams.plz));
+            }
+            if (searchParams.fachrichtung) {
+                results = results.filter(c => c.fachrichtung.toLowerCase().includes(searchParams.fachrichtung.toLowerCase()));
+            }
+            
+            resolve(results);
+        };
+        
+        request.onerror = () => {
+            reject(request.error);
+        };
+    });
+};
+
+// Synchronisationsstatus speichern
+const syncStatus = {
+    lastSync: null,
+    isOnline: navigator.onLine
+};
+
+// Event Listener für Online/Offline Status
+window.addEventListener('online', () => {
+    syncStatus.isOnline = true;
+    document.body.classList.remove('offline');
+    synchronizeData();
+});
+
+window.addEventListener('offline', () => {
+    syncStatus.isOnline = false;
+    document.body.classList.add('offline');
+});
+
+// Daten mit dem Server synchronisieren
+const synchronizeData = async () => {
+    if (!syncStatus.isOnline) return;
+    
+    try {
+        const response = await fetch('/api/customers');
+        const customers = await response.json();
+        await saveCustomers(customers);
+        syncStatus.lastSync = new Date();
+        console.log('Daten erfolgreich synchronisiert');
+    } catch (error) {
+        console.error('Fehler bei der Synchronisation:', error);
+    }
+};
+
+// Export der Funktionen
+window.dbHelper = {
+    initDB,
+    saveCustomers,
+    searchCustomersOffline,
+    synchronizeData,
+    syncStatus
+}; 

static/manifest.json

@@ -0,0 +1,28 @@
+{
+    "name": "MEDI Kunden",
+    "short_name": "MEDI",
+    "description": "MEDI Kundenverwaltung - Offline-fähige PWA",
+    "start_url": "/",
+    "display": "standalone",
+    "background_color": "#ffffff",
+    "theme_color": "#4CAF50",
+    "orientation": "portrait",
+    "icons": [
+        {
+            "src": "/static/images/icon-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "any maskable"
+        },
+        {
+            "src": "/static/images/icon-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "any maskable"
+        }
+    ],
+    "categories": ["business", "productivity"],
+    "lang": "de-DE",
+    "dir": "ltr",
+    "prefer_related_applications": false
+} 

static/sw.js

@@ -0,0 +1,75 @@
+const CACHE_NAME = 'medi-customers-v1';
+const urlsToCache = [
+    '/',
+    '/static/css/styles.css',
+    '/static/js/script.js',
+    '/static/images/logo.png',
+    '/static/images/icon-192x192.png',
+    '/static/images/icon-512x512.png'
+];
+
+// Installation des Service Workers
+self.addEventListener('install', event => {
+    event.waitUntil(
+        caches.open(CACHE_NAME)
+            .then(cache => {
+                console.log('Cache geöffnet');
+                return cache.addAll(urlsToCache);
+            })
+    );
+});
+
+// Aktivierung des Service Workers
+self.addEventListener('activate', event => {
+    event.waitUntil(
+        caches.keys().then(cacheNames => {
+            return Promise.all(
+                cacheNames.map(cacheName => {
+                    if (cacheName !== CACHE_NAME) {
+                        console.log('Lösche alten Cache:', cacheName);
+                        return caches.delete(cacheName);
+                    }
+                })
+            );
+        })
+    );
+});
+
+// Fetch-Event-Handler
+self.addEventListener('fetch', event => {
+    event.respondWith(
+        caches.match(event.request)
+            .then(response => {
+                // Cache-Treffer - gib die Antwort zurück
+                if (response) {
+                    return response;
+                }
+
+                // Kein Cache-Treffer - führe Netzwerkanfrage durch
+                return fetch(event.request)
+                    .then(response => {
+                        // Prüfe, ob wir eine gültige Antwort erhalten haben
+                        if (!response || response.status !== 200 || response.type !== 'basic') {
+                            return response;
+                        }
+
+                        // Klone die Antwort
+                        const responseToCache = response.clone();
+
+                        // Speichere die Antwort im Cache
+                        caches.open(CACHE_NAME)
+                            .then(cache => {
+                                cache.put(event.request, responseToCache);
+                            });
+
+                        return response;
+                    })
+                    .catch(() => {
+                        // Fallback für Offline-Zugriff
+                        if (event.request.mode === 'navigate') {
+                            return caches.match('/offline.html');
+                        }
+                    });
+            })
+    );
+}); 

templates/index.html

@@ -5,9 +5,16 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>medisoftware Kundensuche</title>
     <link rel="icon" type="image/x-icon" href="{{ url_for('static', filename='favicon.ico') }}">
+    <link rel="manifest" href="{{ url_for('static', filename='manifest.json') }}">
+    <meta name="theme-color" content="#4CAF50">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black">
+    <meta name="apple-mobile-web-app-title" content="MEDI">
+    <link rel="apple-touch-icon" href="{{ url_for('static', filename='images/icon-192x192.png') }}">
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
     <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css" rel="stylesheet">
     <link href="{{ url_for('static', filename='css/styles.css') }}" rel="stylesheet">
+    <script src="{{ url_for('static', filename='js/db.js') }}"></script>
 </head>
 <body>
     <div class="main-content">
@@ -104,7 +111,50 @@
         </div>
     </footer>
 
+    <div id="syncStatus" class="sync-status" style="display: none;">
+        <span class="sync-icon">🔄</span>
+        <span class="sync-text">Synchronisiere Daten...</span>
+    </div>
+
+    <div id="offlineIndicator" class="offline-indicator" style="display: none;">
+        <span class="offline-icon">📡</span>
+        <span class="offline-text">Offline-Modus</span>
+    </div>
+
     <script>
+        // Service Worker und IndexedDB initialisieren
+        if ('serviceWorker' in navigator) {
+            window.addEventListener('load', async () => {
+                try {
+                    const registration = await navigator.serviceWorker.register('/sw.js');
+                    console.log('ServiceWorker registration successful');
+                    
+                    // IndexedDB initialisieren und erste Synchronisation starten
+                    await window.dbHelper.initDB();
+                    await window.dbHelper.synchronizeData();
+                } catch (err) {
+                    console.log('ServiceWorker registration failed: ', err);
+                }
+            });
+        }
+
+        // Offline-Status-Anzeige aktualisieren
+        const updateOfflineStatus = () => {
+            const offlineIndicator = document.getElementById('offlineIndicator');
+            const syncStatus = document.getElementById('syncStatus');
+            
+            if (!navigator.onLine) {
+                offlineIndicator.style.display = 'block';
+                syncStatus.style.display = 'none';
+            } else {
+                offlineIndicator.style.display = 'none';
+            }
+        };
+
+        window.addEventListener('online', updateOfflineStatus);
+        window.addEventListener('offline', updateOfflineStatus);
+        updateOfflineStatus();
+
         let searchTimeout;
         let lastResults = [];
 
@@ -281,46 +331,48 @@
             });
         }
 
-        function searchCustomers() {
-            const q = document.getElementById('q').value;
-            const name = document.getElementById('nameInput').value;
-            const ort = document.getElementById('ortInput').value;
-            const nummer = document.getElementById('nummerInput').value;
-            const plz = document.getElementById('plzInput').value;
-            const fachrichtung = document.getElementById('fachrichtungInput').value;
-            const searchOperator = document.querySelector('input[name="searchOperator"]:checked').value;
+        async function searchCustomers() {
+            const searchParams = {
+                q: document.getElementById('q').value,
+                name: document.getElementById('nameInput').value,
+                ort: document.getElementById('ortInput').value,
+                nummer: document.getElementById('nummerInput').value,
+                plz: document.getElementById('plzInput').value,
+                fachrichtung: document.getElementById('fachrichtungInput').value,
+                operator: document.querySelector('input[name="searchOperator"]:checked').value
+            };
 
-            // Zeige das Lade-Icon
             document.getElementById('loading').style.display = 'block';
 
-            // Baue die Suchanfrage
-            const params = new URLSearchParams();
-            if (q) params.append('q', q);
-            if (name) params.append('name', name);
-            if (ort) params.append('ort', ort);
-            if (nummer) params.append('nummer', nummer);
-            if (plz) params.append('plz', plz);
-            if (fachrichtung) params.append('fachrichtung', fachrichtung);
-            if (searchOperator) params.append('operator', searchOperator);
+            try {
+                let results;
+                if (navigator.onLine) {
+                    // Online: Server-Suche
+                    const response = await fetch('/api/search', {
+                        method: 'POST',
+                        headers: {
+                            'Content-Type': 'application/json',
+                        },
+                        body: JSON.stringify(searchParams)
+                    });
+                    results = await response.json();
                     
-            // Führe die Suche durch
-            fetch('/search?' + params.toString())
-                .then(response => response.json())
-                .then(data => {
-                    // Verstecke das Lade-Icon
-                    document.getElementById('loading').style.display = 'none';
-                    
-                    if (data.error) {
-                        return;
+                    // Speichere die Ergebnisse in IndexedDB
+                    await window.dbHelper.saveCustomers(results);
+                } else {
+                    // Offline: Lokale Suche
+                    results = await window.dbHelper.searchCustomersOffline(searchParams);
                 }
 
-                    lastResults = data;
+                lastResults = results;
+                displayResults(results);
                 updateResultCounts();
-                    displayResults(data);
-                })
-                .catch(error => {
+            } catch (error) {
+                console.error('Fehler bei der Suche:', error);
+                document.getElementById('results').innerHTML = '<p>Ein Fehler ist aufgetreten. Bitte versuchen Sie es später erneut.</p>';
+            } finally {
                 document.getElementById('loading').style.display = 'none';
-                });
+            }
         }
 
         // Event-Listener für die Live-Suche

templates/offline.html

@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Offline - MEDI Kunden</title>
+    <link rel="stylesheet" href="{{ url_for('static', filename='css/styles.css') }}">
+    <style>
+        .offline-container {
+            text-align: center;
+            padding: 2rem;
+            max-width: 600px;
+            margin: 2rem auto;
+        }
+        .offline-icon {
+            font-size: 4rem;
+            color: #666;
+            margin-bottom: 1rem;
+        }
+        .offline-message {
+            font-size: 1.2rem;
+            color: #333;
+            margin-bottom: 1.5rem;
+        }
+        .retry-button {
+            background-color: #4CAF50;
+            color: white;
+            padding: 0.8rem 1.5rem;
+            border: none;
+            border-radius: 4px;
+            cursor: pointer;
+            font-size: 1rem;
+        }
+        .retry-button:hover {
+            background-color: #45a049;
+        }
+    </style>
+</head>
+<body>
+    <div class="offline-container">
+        <div class="offline-icon">📡</div>
+        <h1>Sie sind offline</h1>
+        <p class="offline-message">
+            Es scheint, dass Sie keine Internetverbindung haben. 
+            Bitte überprüfen Sie Ihre Verbindung und versuchen Sie es erneut.
+        </p>
+        <button class="retry-button" onclick="window.location.reload()">
+            Erneut versuchen
+        </button>
+    </div>
+    <script>
+        // Automatische Überprüfung der Verbindung
+        window.addEventListener('online', function() {
+            window.location.reload();
+        });
+    </script>
+</body>
+</html>