updated printing solutions

py_app/app/warehouse.py

@@ -1,6 +1,11 @@
 import mariadb
-from flask import current_app, request, render_template, session, redirect, url_for
+from flask import current_app, request, render_template, session, redirect, url_for, jsonify, make_response
 import csv, os, tempfile
+from reportlab.lib.pagesizes import letter
+from reportlab.pdfgen import canvas
+from reportlab.lib.units import cm
+from reportlab.graphics.barcode import code128
+import io
 
 def get_db_connection():
     settings_file = current_app.instance_path + '/external_server.conf'
@@ -148,3 +153,68 @@ def import_locations_csv_handler():
     elif 'csv_locations' in session:
         locations = session['csv_locations']
     return render_template('import_locations_csv.html', report=report, locations=locations)
+
+def generate_location_label_pdf():
+    """Generate PDF for location barcode label (8x4cm)"""
+    try:
+        data = request.get_json()
+        location_code = data.get('location_code', '')
+        
+        if not location_code:
+            return jsonify({'error': 'Location code is required'}), 400
+        
+        # Create PDF in memory
+        buffer = io.BytesIO()
+        
+        # Create PDF with 8x4cm page size (width x height)
+        page_width = 8 * cm
+        page_height = 4 * cm
+        
+        c = canvas.Canvas(buffer, pagesize=(page_width, page_height))
+        
+        # Generate Code128 barcode
+        barcode = code128.Code128(location_code, barWidth=1.0, humanReadable=False)
+        
+        # Calculate the desired barcode dimensions (fill most of the label)
+        desired_barcode_width = 7 * cm  # Almost full width
+        desired_barcode_height = 2.5 * cm  # Most of the height
+        
+        # Calculate scaling factor to fit the desired width
+        scale = desired_barcode_width / barcode.width
+        
+        # Calculate actual dimensions after scaling
+        actual_width = barcode.width * scale
+        actual_height = barcode.height * scale
+        
+        # Center the barcode on the label
+        barcode_x = (page_width - actual_width) / 2
+        barcode_y = (page_height - actual_height) / 2 + 0.3 * cm  # Slightly above center for text space
+        
+        # Draw barcode with scaling
+        c.saveState()
+        c.translate(barcode_x, barcode_y)
+        c.scale(scale, scale)
+        barcode.drawOn(c, 0, 0)
+        c.restoreState()
+        
+        # Add location code text below barcode
+        c.setFont("Helvetica-Bold", 10)
+        text_width = c.stringWidth(location_code, "Helvetica-Bold", 10)
+        text_x = (page_width - text_width) / 2
+        text_y = barcode_y - 0.5 * cm  # Below the barcode
+        c.drawString(text_x, text_y, location_code)
+        
+        # Finalize PDF
+        c.save()
+        
+        # Prepare response
+        buffer.seek(0)
+        response = make_response(buffer.getvalue())
+        response.headers['Content-Type'] = 'application/pdf'
+        response.headers['Content-Disposition'] = f'inline; filename=location_{location_code}_label.pdf'
+        
+        return response
+        
+    except Exception as e:
+        print(f"Error generating location label PDF: {e}")
+        return jsonify({'error': str(e)}), 500