Add barcode detection debugging and test script

app.py

@@ -54,9 +54,11 @@ except Exception:
 try:
     from barcode_reader import read_barcodes_from_path
     HAS_BARCODE = True
-except Exception:
+    print("✓ Barcode reader imported successfully")
+except Exception as e:
     read_barcodes_from_path = None
     HAS_BARCODE = False
+    print(f"✗ Barcode reader import failed: {e}")
 
 # -------------------- Core Data --------------------
 @dataclass
@@ -1172,6 +1174,12 @@ def compare_pdfs(file_a, file_b):
                 
                 # Debug: Print barcode detection results
                 print(f"Barcode detection results - A: {len(bar_a)} codes, B: {len(bar_b)} codes")
+                print(f"Raw codes_a: {len(codes_a)} items")
+                print(f"Raw codes_b: {len(codes_b)} items")
+                if codes_a:
+                    print(f"Sample code_a: {codes_a[0] if codes_a else 'None'}")
+                if codes_b:
+                    print(f"Sample code_b: {codes_b[0] if codes_b else 'None'}")
             except Exception as e:
                 print(f"Barcode detection error: {e}")
                 bar_a, info_a = [], []

test_barcode.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+"""
+Simple test script to verify barcode reader functionality
+"""
+
+def test_barcode_imports():
+    """Test if all required modules can be imported"""
+    print("Testing barcode reader imports...")
+    
+    try:
+        import numpy as np
+        print("✓ numpy imported")
+    except Exception as e:
+        print(f"✗ numpy failed: {e}")
+        return False
+    
+    try:
+        from PIL import Image
+        print("✓ PIL imported")
+    except Exception as e:
+        print(f"✗ PIL failed: {e}")
+        return False
+    
+    try:
+        import cv2
+        print("✓ OpenCV imported")
+        has_barcode = hasattr(cv2, 'barcode') and hasattr(getattr(cv2, 'barcode'), 'BarcodeDetector')
+        print(f"✓ OpenCV barcode detector: {has_barcode}")
+    except Exception as e:
+        print(f"✗ OpenCV failed: {e}")
+        return False
+    
+    try:
+        import zxingcpp
+        print("✓ zxingcpp imported")
+    except Exception as e:
+        print(f"✗ zxingcpp failed: {e}")
+        return False
+    
+    try:
+        import fitz
+        print("✓ PyMuPDF imported")
+    except Exception as e:
+        print(f"✗ PyMuPDF failed: {e}")
+        return False
+    
+    try:
+        from barcode_reader import read_barcodes_from_path
+        print("✓ barcode_reader imported")
+        return True
+    except Exception as e:
+        print(f"✗ barcode_reader failed: {e}")
+        return False
+
+def test_barcode_function():
+    """Test the barcode reader function with a simple case"""
+    print("\nTesting barcode reader function...")
+    
+    try:
+        from barcode_reader import read_barcodes_from_path
+        print("✓ read_barcodes_from_path function available")
+        
+        # Test with a non-existent file (should return empty list, not crash)
+        result = read_barcodes_from_path("nonexistent.pdf")
+        print(f"✓ Function handles non-existent file: {type(result)}")
+        
+        return True
+    except Exception as e:
+        print(f"✗ barcode function test failed: {e}")
+        return False
+
+if __name__ == "__main__":
+    print("=== Barcode Reader Test ===")
+    
+    imports_ok = test_barcode_imports()
+    if imports_ok:
+        function_ok = test_barcode_function()
+        if function_ok:
+            print("\n✓ All tests passed!")
+        else:
+            print("\n✗ Function test failed")
+    else:
+        print("\n✗ Import tests failed")