Fix QZ Tray library loading and add pairing keys API endpoint

- Fix QZ Tray library loading errors (net::ERR_NAME_NOT_RESOLVED) by switching from CDN to local static file
- Add /labels/api/pairing-keys endpoint to fetch valid printer pairing keys
- Update print_labels.html to use local js/qz-tray.js
- Update print_lost_labels.html to use local js/qz-tray.js
- Update print_lost_labels_new.html to use correct path js/qz-tray.js
- Update fg_scan.html to use local js/qz-tray.js
- API returns active pairing keys from qz_pairing_keys table for printer selection

Dockerfile

@@ -11,8 +11,11 @@ ENV PYTHONUNBUFFERED=1 \
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    python3-dev \
     mariadb-client \
     curl \
+    libpq-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Create application directory

app/modules/labels/routes.py

@@ -487,4 +487,39 @@ def api_generate_batch_pdf(order_id):
         
     except Exception as e:
         logger.error(f"Error generating batch PDF: {e}")
+        return jsonify({'error': str(e)}), 500
+
+
+@labels_bp.route('/api/pairing-keys', methods=['GET'], endpoint='api_pairing_keys')
+def api_pairing_keys():
+    """Get QZ Tray pairing keys for printer selection"""
+    if 'user_id' not in session:
+        return jsonify({'error': 'Unauthorized'}), 401
+    
+    try:
+        conn = get_db()
+        cursor = conn.cursor()
+        
+        cursor.execute("""
+            SELECT id, printer_name, pairing_key, valid_until 
+            FROM qz_pairing_keys 
+            WHERE valid_until >= CURDATE()
+            ORDER BY printer_name ASC
+        """)
+        
+        pairing_keys = []
+        for row in cursor.fetchall():
+            pairing_keys.append({
+                'id': row[0],
+                'printer_name': row[1],
+                'pairing_key': row[2]
+            })
+        
+        cursor.close()
+        
+        logger.info(f"Retrieved {len(pairing_keys)} valid pairing keys")
+        return jsonify(pairing_keys), 200
+        
+    except Exception as e:
+        logger.error(f"Error fetching pairing keys: {e}")
         return jsonify({'error': str(e)}), 500

app/templates/modules/labels/print_labels.html

@@ -290,8 +290,11 @@
 <!-- Add html2canvas library for capturing preview as image -->
 <script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js"></script>
 <!-- PATCHED QZ Tray library - works with custom server using pairing key authentication -->
+<script src="{{ url_for('static', filename='js/qz-tray.js') }}"></script>
+<!-- CDN versions (disabled): 
 <script src="https://qz.glyphtree.com/api/latest/qz-tray.js"></script>
-<!-- Original CDN version (disabled): <script src="https://cdn.jsdelivr.net/npm/qz-tray@2.2.4/qz-tray.js"></script> -->
+<script src="https://cdn.jsdelivr.net/npm/qz-tray@2.2.4/qz-tray.js"></script> 
+-->
 
 <script>
 // Simplified notification system

app/templates/modules/labels/print_lost_labels.html

@@ -237,7 +237,7 @@
 <!-- Add html2canvas library for capturing preview as image -->
 <script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js"></script>
 <!-- PATCHED QZ Tray library - works with custom server using pairing key authentication -->
-<script src="https://qz.glyphtree.com/api/latest/qz-tray.js"></script>
+<script src="{{ url_for('static', filename='js/qz-tray.js') }}"></script>
 <script>
 
 // Store all orders data for searching (will be populated by API fetch on page load)

app/templates/modules/labels/print_lost_labels_new.html

@@ -230,7 +230,7 @@
 <!-- Add html2canvas library for capturing preview as image -->
 <script src="{{ url_for('static', filename='html2canvas.min.js') }}"></script>
 <!-- PATCHED QZ Tray library - works with custom server using pairing key authentication -->
-<script src="{{ url_for('static', filename='qz-tray.js') }}"></script>
+<script src="{{ url_for('static', filename='js/qz-tray.js') }}"></script>
 <script>
 
 // Store all orders data for searching

app/templates/modules/quality/fg_scan.html

@@ -4,7 +4,7 @@
 
 {% block extra_css %}
 <link rel="stylesheet" href="{{ url_for('static', filename='css/fg_scan.css') }}">
-<script src="https://cdn.jsdelivr.net/npm/qz-tray@2.1.0/qz-tray.js"></script>
+<script src="{{ url_for('static', filename='js/qz-tray.js') }}"></script>
 {% endblock %}
 
 {% block content %}

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.8'
+#version: '3.8'
 
 services:
   # MariaDB Database Service

documentation/add_labels_test_data.py

@@ -0,0 +1,260 @@
+#!/usr/bin/env python3
+"""
+Add Example/Test Data for Labels Module
+Creates sample orders in order_for_labels table for testing printing functionality via QZ Tray
+"""
+
+import sys
+import os
+sys.path.append(os.path.dirname(os.path.abspath(__file__)))
+
+from app.database import get_db
+import logging
+from datetime import datetime, timedelta
+
+# Configure logging
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+logger = logging.getLogger(__name__)
+
+def add_sample_labels_data():
+    """Add sample order data for testing labels/printing functionality"""
+    try:
+        conn = get_db()
+        cursor = conn.cursor()
+        
+        # Check if table exists
+        cursor.execute("SHOW TABLES LIKE 'order_for_labels'")
+        if not cursor.fetchone():
+            logger.error("order_for_labels table does not exist. Please run initialize_db.py first.")
+            return False
+        
+        # Clear existing test data (optional - comment out if you want to keep existing data)
+        logger.info("Clearing existing test data...")
+        cursor.execute("DELETE FROM order_for_labels WHERE comanda_productie LIKE 'TEST%'")
+        
+        # Sample test data for different scenarios
+        test_orders = [
+            {
+                'comanda_productie': 'TEST-ORD-001',
+                'cod_articol': 'ART001',
+                'descr_com_prod': 'Electronic Component Type A - High Performance',
+                'cantitate': 150,
+                'com_achiz_client': 'CLIENT-PO-2024-001',
+                'nr_linie_com_client': '01',
+                'customer_name': 'TechCorp Industries',
+                'customer_article_number': 'TC-COMP-A001',
+                'open_for_order': 1,
+                'line_number': 1,
+                'printed_labels': 0,  # Not printed - will show in unprinted list
+                'data_livrara': '2024-03-15',  # Fixed field name to match DB schema
+                'dimensiune': 'Standard-Large'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-002',
+                'cod_articol': 'ART002',
+                'descr_com_prod': 'Mechanical Part B - Precision Machined',
+                'cantitate': 75,
+                'com_achiz_client': 'CLIENT-PO-2024-002',
+                'nr_linie_com_client': '02',
+                'customer_name': 'MechParts Ltd',
+                'customer_article_number': 'MP-PART-B002',
+                'open_for_order': 1,
+                'line_number': 2,
+                'printed_labels': 0,  # Not printed
+                'data_livrara': '2024-03-18',
+                'dimensiune': 'Medium'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-003',
+                'cod_articol': 'ART003',
+                'descr_com_prod': 'Plastic Housing C - UV Resistant',
+                'cantitate': 200,
+                'com_achiz_client': 'CLIENT-PO-2024-003',
+                'nr_linie_com_client': '03',
+                'customer_name': 'PlasticWorks Inc',
+                'customer_article_number': 'PW-HOUSE-C003',
+                'open_for_order': 1,
+                'line_number': 3,
+                'printed_labels': 1,  # Already printed - will show in printed list
+                'data_livrara': '2024-03-20',
+                'dimensiune': 'Large'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-004',
+                'cod_articol': 'ART004',
+                'descr_com_prod': 'Metal Bracket D - Galvanized Steel',
+                'cantitate': 300,
+                'com_achiz_client': 'CLIENT-PO-2024-004',
+                'nr_linie_com_client': '04',
+                'customer_name': 'MetalCraft Solutions',
+                'customer_article_number': 'MC-BRACK-D004',
+                'open_for_order': 1,
+                'line_number': 4,
+                'printed_labels': 0,  # Not printed
+                'data_livrara': '2024-03-22',
+                'dimensiune': 'Small'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-005',
+                'cod_articol': 'ART005',
+                'descr_com_prod': 'Circuit Board E - Multi-layer PCB',
+                'cantitate': 50,
+                'com_achiz_client': 'CLIENT-PO-2024-005',
+                'nr_linie_com_client': '05',
+                'customer_name': 'CircuitTech Systems',
+                'customer_article_number': 'CT-PCB-E005',
+                'open_for_order': 1,
+                'line_number': 5,
+                'printed_labels': 0,  # Not printed
+                'data_livrara': '2024-03-25',
+                'dimensiune': 'Standard'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-006',
+                'cod_articol': 'ART006',
+                'descr_com_prod': 'Rubber Gasket F - High Temperature',
+                'cantitate': 500,
+                'com_achiz_client': 'CLIENT-PO-2024-006',
+                'nr_linie_com_client': '06',
+                'customer_name': 'RubberPro Manufacturing',
+                'customer_article_number': 'RP-GASKET-F006',
+                'open_for_order': 1,
+                'line_number': 6,
+                'printed_labels': 1,  # Already printed
+                'data_livrara': '2024-03-28',
+                'dimensiune': 'Extra-Small'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-007',
+                'cod_articol': 'ART007',
+                'descr_com_prod': 'Glass Panel G - Tempered Safety Glass',
+                'cantitate': 25,
+                'com_achiz_client': 'CLIENT-PO-2024-007',
+                'nr_linie_com_client': '07',
+                'customer_name': 'GlassTech Innovations',
+                'customer_article_number': 'GT-PANEL-G007',
+                'open_for_order': 1,
+                'line_number': 7,
+                'printed_labels': 0,  # Not printed - urgent order
+                'data_livrara': '2024-03-12',  # Past due date for testing
+                'dimensiune': 'Extra-Large'
+            },
+            {
+                'comanda_productie': 'TEST-ORD-008',
+                'cod_articol': 'ART008',
+                'descr_com_prod': 'Fabric Cover H - Water-Resistant Canvas',
+                'cantitate': 120,
+                'com_achiz_client': 'CLIENT-PO-2024-008',
+                'nr_linie_com_client': '08',
+                'customer_name': 'FabricWorks Design',
+                'customer_article_number': 'FW-COVER-H008',
+                'open_for_order': 0,  # Not open for order - for testing
+                'line_number': 8,
+                'printed_labels': 0,
+                'data_livrara': '2024-04-01',
+                'dimensiune': 'Custom'
+            }
+        ]
+        
+        # Insert test data
+        logger.info(f"Inserting {len(test_orders)} test orders...")
+        
+        for order in test_orders:
+            cursor.execute("""
+                INSERT INTO order_for_labels (
+                    comanda_productie, cod_articol, descr_com_prod, cantitate,
+                    com_achiz_client, nr_linie_com_client, customer_name,
+                    customer_article_number, open_for_order, line_number,
+                    printed_labels, data_livrara, dimensiune
+                ) VALUES (
+                    %(comanda_productie)s, %(cod_articol)s, %(descr_com_prod)s, %(cantitate)s,
+                    %(com_achiz_client)s, %(nr_linie_com_client)s, %(customer_name)s,
+                    %(customer_article_number)s, %(open_for_order)s, %(line_number)s,
+                    %(printed_labels)s, %(data_livrara)s, %(dimensiune)s
+                )
+            """, order)
+        
+        conn.commit()
+        cursor.close()
+        conn.close()
+        
+        logger.info("✅ Successfully added test data for labels module!")
+        logger.info("Test data summary:")
+        logger.info(f"  - Total orders: {len(test_orders)}")
+        logger.info(f"  - Unprinted orders: {sum(1 for o in test_orders if o['printed_labels'] == 0)}")
+        logger.info(f"  - Printed orders: {sum(1 for o in test_orders if o['printed_labels'] == 1)}")
+        logger.info("  - Test order codes: TEST-ORD-001 through TEST-ORD-008")
+        logger.info("\nYou can now test:")
+        logger.info("  1. Navigate to /labels/print-module")
+        logger.info("  2. View unprinted orders (should show 6 orders)")
+        logger.info("  3. Generate PDF labels and test QZ Tray printing")
+        logger.info("  4. Mark orders as printed and verify status updates")
+        
+        return True
+        
+    except Exception as e:
+        logger.error(f"Error adding test data: {e}")
+        return False
+
+
+def verify_test_data():
+    """Verify that test data was added correctly"""
+    try:
+        conn = get_db()
+        cursor = conn.cursor()
+        
+        # Count total test orders
+        cursor.execute("SELECT COUNT(*) FROM order_for_labels WHERE comanda_productie LIKE 'TEST%'")
+        total_count = cursor.fetchone()[0]
+        
+        # Count unprinted test orders
+        cursor.execute("SELECT COUNT(*) FROM order_for_labels WHERE comanda_productie LIKE 'TEST%' AND printed_labels = 0")
+        unprinted_count = cursor.fetchone()[0]
+        
+        # Count printed test orders
+        cursor.execute("SELECT COUNT(*) FROM order_for_labels WHERE comanda_productie LIKE 'TEST%' AND printed_labels = 1")
+        printed_count = cursor.fetchone()[0]
+        
+        logger.info(f"\n📋 Test Data Verification:")
+        logger.info(f"  - Total test orders: {total_count}")
+        logger.info(f"  - Unprinted orders: {unprinted_count}")
+        logger.info(f"  - Printed orders: {printed_count}")
+        
+        # List some sample orders
+        cursor.execute("""
+            SELECT comanda_productie, descr_com_prod, cantitate, printed_labels, data_livrara
+            FROM order_for_labels 
+            WHERE comanda_productie LIKE 'TEST%' 
+            ORDER BY comanda_productie 
+            LIMIT 5
+        """)
+        
+        orders = cursor.fetchall()
+        if orders:
+            logger.info(f"\n🏷️  Sample Test Orders:")
+            for order in orders:
+                status = "✅ Printed" if order[3] else "⏳ Unprinted"
+                logger.info(f"  - {order[0]}: {order[1][:50]}... (Qty: {order[2]}, {status})")
+        
+        cursor.close()
+        conn.close()
+        return True
+        
+    except Exception as e:
+        logger.error(f"Error verifying test data: {e}")
+        return False
+
+
+if __name__ == "__main__":
+    logger.info("🏷️  Adding Labels Module Test Data...")
+    
+    if add_sample_labels_data():
+        verify_test_data()
+        logger.info("\n🎉 Test data successfully added!")
+        logger.info("\nNext steps:")
+        logger.info("1. Start the application: docker compose up -d")
+        logger.info("2. Navigate to: http://localhost:8080/labels/print-module")
+        logger.info("3. Test QZ Tray printing functionality")
+    else:
+        logger.error("❌ Failed to add test data")
+        sys.exit(1)

documentation/add_labels_test_data_direct.py

@@ -0,0 +1,149 @@
+#!/usr/bin/env python3
+"""
+Add Example/Test Data for Labels Module - Direct Database Version
+Creates sample orders in order_for_labels table for testing printing functionality via QZ Tray
+"""
+
+import pymysql
+import logging
+from datetime import datetime
+
+# Configure logging
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+logger = logging.getLogger(__name__)
+
+# Database connection parameters
+DB_CONFIG = {
+    'host': 'localhost',
+    'port': 3306,
+    'user': 'quality_user',
+    'password': 'qualitypass',
+    'database': 'quality_db',
+    'charset': 'utf8mb4'
+}
+
+def add_sample_labels_data():
+    """Add sample order data for testing labels/printing functionality"""
+    try:
+        # Connect to database
+        conn = pymysql.connect(**DB_CONFIG)
+        cursor = conn.cursor()
+        
+        # Check if table exists
+        cursor.execute("SHOW TABLES LIKE 'order_for_labels'")
+        if not cursor.fetchone():
+            logger.error("order_for_labels table does not exist. Please run initialize_db.py first.")
+            return False
+        
+        # Clear existing test data (optional - comment out if you want to keep existing data)
+        logger.info("Clearing existing test data...")
+        cursor.execute("DELETE FROM order_for_labels WHERE comanda_productie LIKE 'TEST%'")
+        
+        # Sample test data for different scenarios
+        test_orders = [
+            ('TEST-ORD-001', 'ART001', 'Electronic Component Type A - High Performance', 150, 'CLIENT-PO-2024-001', '01', 'TechCorp Industries', 'TC-COMP-A001', 1, 1, 0, '2024-03-15', 'Standard-Large'),
+            ('TEST-ORD-002', 'ART002', 'Mechanical Part B - Precision Machined', 75, 'CLIENT-PO-2024-002', '02', 'MechParts Ltd', 'MP-PART-B002', 1, 2, 0, '2024-03-18', 'Medium'),
+            ('TEST-ORD-003', 'ART003', 'Plastic Housing C - UV Resistant', 200, 'CLIENT-PO-2024-003', '03', 'PlasticWorks Inc', 'PW-HOUSE-C003', 1, 3, 1, '2024-03-20', 'Large'),
+            ('TEST-ORD-004', 'ART004', 'Metal Bracket D - Galvanized Steel', 300, 'CLIENT-PO-2024-004', '04', 'MetalCraft Solutions', 'MC-BRACK-D004', 1, 4, 0, '2024-03-22', 'Small'),
+            ('TEST-ORD-005', 'ART005', 'Circuit Board E - Multi-layer PCB', 50, 'CLIENT-PO-2024-005', '05', 'CircuitTech Systems', 'CT-PCB-E005', 1, 5, 0, '2024-03-25', 'Standard'),
+            ('TEST-ORD-006', 'ART006', 'Rubber Gasket F - High Temperature', 500, 'CLIENT-PO-2024-006', '06', 'RubberPro Manufacturing', 'RP-GASKET-F006', 1, 6, 1, '2024-03-28', 'Extra-Small'),
+            ('TEST-ORD-007', 'ART007', 'Glass Panel G - Tempered Safety Glass', 25, 'CLIENT-PO-2024-007', '07', 'GlassTech Innovations', 'GT-PANEL-G007', 1, 7, 0, '2024-03-12', 'Extra-Large'),
+            ('TEST-ORD-008', 'ART008', 'Fabric Cover H - Water-Resistant Canvas', 120, 'CLIENT-PO-2024-008', '08', 'FabricWorks Design', 'FW-COVER-H008', 0, 8, 0, '2024-04-01', 'Custom'),
+        ]
+        
+        # Insert test data
+        logger.info(f"Inserting {len(test_orders)} test orders...")
+        
+        cursor.executemany("""
+            INSERT INTO order_for_labels (
+                comanda_productie, cod_articol, descr_com_prod, cantitate,
+                com_achiz_client, nr_linie_com_client, customer_name,
+                customer_article_number, open_for_order, line_number,
+                printed_labels, data_livrara, dimensiune
+            ) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
+        """, test_orders)
+        
+        conn.commit()
+        cursor.close()
+        conn.close()
+        
+        logger.info("✅ Successfully added test data for labels module!")
+        logger.info("Test data summary:")
+        logger.info(f"  - Total orders: {len(test_orders)}")
+        logger.info(f"  - Unprinted orders: {sum(1 for o in test_orders if o[10] == 0)}")  # printed_labels is index 10
+        logger.info(f"  - Printed orders: {sum(1 for o in test_orders if o[10] == 1)}")
+        logger.info("  - Test order codes: TEST-ORD-001 through TEST-ORD-008")
+        logger.info("\nYou can now test:")
+        logger.info("  1. Navigate to /labels/print-module")
+        logger.info("  2. View unprinted orders (should show 6 orders)")
+        logger.info("  3. Generate PDF labels and test QZ Tray printing")
+        logger.info("  4. Mark orders as printed and verify status updates")
+        
+        return True
+        
+    except Exception as e:
+        logger.error(f"Error adding test data: {e}")
+        return False
+
+
+def verify_test_data():
+    """Verify that test data was added correctly"""
+    try:
+        conn = pymysql.connect(**DB_CONFIG)
+        cursor = conn.cursor()
+        
+        # Count total test orders
+        cursor.execute("SELECT COUNT(*) FROM order_for_labels WHERE comanda_productie LIKE 'TEST%'")
+        total_count = cursor.fetchone()[0]
+        
+        # Count unprinted test orders
+        cursor.execute("SELECT COUNT(*) FROM order_for_labels WHERE comanda_productie LIKE 'TEST%' AND printed_labels = 0")
+        unprinted_count = cursor.fetchone()[0]
+        
+        # Count printed test orders
+        cursor.execute("SELECT COUNT(*) FROM order_for_labels WHERE comanda_productie LIKE 'TEST%' AND printed_labels = 1")
+        printed_count = cursor.fetchone()[0]
+        
+        logger.info(f"\n📋 Test Data Verification:")
+        logger.info(f"  - Total test orders: {total_count}")
+        logger.info(f"  - Unprinted orders: {unprinted_count}")
+        logger.info(f"  - Printed orders: {printed_count}")
+        
+        # List some sample orders
+        cursor.execute("""
+            SELECT comanda_productie, descr_com_prod, cantitate, printed_labels, data_livrara
+            FROM order_for_labels 
+            WHERE comanda_productie LIKE 'TEST%' 
+            ORDER BY comanda_productie 
+            LIMIT 5
+        """)
+        
+        orders = cursor.fetchall()
+        if orders:
+            logger.info(f"\n🏷️  Sample Test Orders:")
+            for order in orders:
+                status = "✅ Printed" if order[3] else "⏳ Unprinted"
+                desc = order[1][:50] + "..." if len(order[1]) > 50 else order[1]
+                logger.info(f"  - {order[0]}: {desc} (Qty: {order[2]}, {status})")
+        
+        cursor.close()
+        conn.close()
+        return True
+        
+    except Exception as e:
+        logger.error(f"Error verifying test data: {e}")
+        return False
+
+
+if __name__ == "__main__":
+    logger.info("🏷️  Adding Labels Module Test Data...")
+    
+    if add_sample_labels_data():
+        verify_test_data()
+        logger.info("\n🎉 Test data successfully added!")
+        logger.info("\nNext steps:")
+        logger.info("1. Navigate to: http://localhost:8781/labels/print-module")
+        logger.info("2. Test QZ Tray printing functionality")
+        logger.info("3. Use test orders TEST-ORD-001 through TEST-ORD-008")
+    else:
+        logger.error("❌ Failed to add test data")

requirements.txt

@@ -9,4 +9,5 @@ Markdown==3.5.1
 APScheduler==3.10.4
 reportlab==4.0.7
 python-barcode==0.15.1
-Flask-Session==0.8.0openpyxl==3.10.0
+Flask-Session==0.8.0
+openpyxl==3.1.5