fix: made warehouse report more robust against encoding issues

backend/services/warehouse_report_service.py

@@ -7,60 +7,69 @@ from datetime import datetime
 class WarehouseReportService:
     @staticmethod
     def generate_report():
-        # Fetch all stock items with material names
-        query = """
-            SELECT w.*, m.name_en as material_name, m.name_ru as material_name_ru
-            FROM warehouse_stock w
-            JOIN materials m ON w.material_id = m.id
-            ORDER BY m.name_en, w.color_name
-        """
-        stock = db.execute_query(query)
-        
-        pdf = FPDF(orientation='P', unit='mm', format='A4')
-        pdf.add_page()
-        
-        # Header
-        pdf.set_font("helvetica", "B", 16)
-        pdf.cell(0, 10, "Warehouse Stock Report", ln=True, align='C')
-        pdf.set_font("helvetica", "", 10)
-        pdf.cell(0, 5, f"Date: {datetime.now().strftime('%d.%m.%Y %H:%M')}", ln=True, align='C')
-        pdf.ln(10)
-        
-        # Table Header
-        pdf.set_fill_color(240, 240, 240)
-        pdf.set_font("helvetica", "B", 10)
-        pdf.cell(60, 10, "Material", border=1, fill=True)
-        pdf.cell(40, 10, "Color", border=1, fill=True)
-        pdf.cell(30, 10, "Unit Mass", border=1, fill=True, align='C')
-        pdf.cell(30, 10, "Units", border=1, fill=True, align='C')
-        pdf.cell(30, 10, "Total (kg)", border=1, fill=True, align='C')
-        pdf.ln()
-        
-        # Table Body
-        pdf.set_font("helvetica", "", 10)
-        total_weight = 0
-        for item in stock:
-            pdf.cell(60, 10, str(item['material_name']), border=1)
-            pdf.cell(40, 10, str(item['color_name']), border=1)
-            pdf.cell(30, 10, f"{item['unit_mass']:.3f}", border=1, align='C')
-            pdf.cell(30, 10, str(item['units_count']), border=1, align='C')
-            pdf.cell(30, 10, f"{item['quantity']:.3f}", border=1, align='C')
+        try:
+            # Fetch all stock items with material names
+            query = """
+                SELECT w.*, m.name_en as material_name, m.name_ru as material_name_ru
+                FROM warehouse_stock w
+                JOIN materials m ON w.material_id = m.id
+                ORDER BY m.name_en, w.color_name
+            """
+            stock = db.execute_query(query)
+            
+            pdf = FPDF(orientation='P', unit='mm', format='A4')
+            pdf.add_page()
+            
+            # Header
+            pdf.set_font("helvetica", "B", 16)
+            pdf.cell(0, 10, "Warehouse Stock Report", ln=True, align='C')
+            pdf.set_font("helvetica", "", 10)
+            pdf.cell(0, 5, f"Date: {datetime.now().strftime('%d.%m.%Y %H:%M')}", ln=True, align='C')
+            pdf.ln(10)
+            
+            # Table Header
+            pdf.set_fill_color(240, 240, 240)
+            pdf.set_font("helvetica", "B", 10)
+            pdf.cell(60, 10, "Material", border=1, fill=True)
+            pdf.cell(40, 10, "Color", border=1, fill=True)
+            pdf.cell(30, 10, "Unit Mass", border=1, fill=True, align='C')
+            pdf.cell(30, 10, "Units", border=1, fill=True, align='C')
+            pdf.cell(30, 10, "Total (kg)", border=1, fill=True, align='C')
             pdf.ln()
-            total_weight += float(item['quantity'])
             
-        # Total
-        pdf.set_font("helvetica", "B", 10)
-        pdf.cell(160, 10, "GRAND TOTAL WEIGHT (kg):", border=1, align='R')
-        pdf.cell(30, 10, f"{total_weight:.3f}", border=1, align='C')
-        
-        # Output
-        filename = f"warehouse_report_{datetime.now().strftime('%Y%m%d_%H%M%S')}.pdf"
-        report_dir = os.path.join(config.UPLOAD_DIR, "reports")
-        os.makedirs(report_dir, exist_ok=True)
-        filepath = os.path.join(report_dir, filename)
-        
-        pdf.output(filepath)
-        
-        return os.path.join("uploads", "reports", filename).replace("\\", "/")
+            # Table Body
+            pdf.set_font("helvetica", "", 10)
+            total_weight = 0
+            for item in stock:
+                # Use name_en to avoid encoding issues with core fonts
+                name = str(item.get('material_name') or "N/A").encode('latin-1', 'replace').decode('latin-1')
+                color = str(item.get('color_name') or "N/A").encode('latin-1', 'replace').decode('latin-1')
+                
+                pdf.cell(60, 10, name, border=1)
+                pdf.cell(40, 10, color, border=1)
+                pdf.cell(30, 10, f"{float(item['unit_mass']):.3f}", border=1, align='C')
+                pdf.cell(30, 10, str(item['units_count']), border=1, align='C')
+                pdf.cell(30, 10, f"{float(item['quantity']):.3f}", border=1, align='C')
+                pdf.ln()
+                total_weight += float(item['quantity'])
+                
+            # Total
+            pdf.set_font("helvetica", "B", 10)
+            pdf.cell(160, 10, "GRAND TOTAL WEIGHT (kg):", border=1, align='R')
+            pdf.cell(30, 10, f"{total_weight:.3f}", border=1, align='C')
+            
+            # Output
+            filename = f"warehouse_report_{datetime.now().strftime('%Y%m%d_%H%M%S')}.pdf"
+            report_dir = os.path.join(config.UPLOAD_DIR, "reports")
+            if not os.path.exists(report_dir):
+                os.makedirs(report_dir, exist_ok=True)
+            filepath = os.path.join(report_dir, filename)
+            
+            pdf.output(filepath)
+            
+            return f"uploads/reports/{filename}"
+        except Exception as e:
+            print(f"REPORT ERROR: {str(e)}")
+            raise e
 
 warehouse_report_service = WarehouseReportService()