Barcode Printing Utility Done

kifi-app/lib/features/barcode_designer/services/template_data_resolver.dart

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+import 'package:intl/intl.dart';
+import '../../inventory/domain/product.dart';
+import '../../inventory/domain/inventory_item.dart';
+import '../domain/label_document.dart';
+
+class TemplateDataResolver {
+  static final NumberFormat _currencyFormatter = NumberFormat('#,##,##0.##');
+
+  /// Resolves a single field value from a Product (and optional InventoryItem)
+  static String? resolveFieldValue({
+    required String source,
+    required String fieldKey,
+    Product? product,
+    InventoryItem? inventoryItem,
+  }) {
+    if (product == null && inventoryItem == null) return null;
+
+    if (source == 'product' && product != null) {
+      switch (fieldKey) {
+        case 'name':
+          return product.name;
+        case 'sku':
+          return product.sku ?? (inventoryItem?.tagNumber ?? 'SKU-001');
+        case 'barcode':
+          return (product.barcode != null && product.barcode!.isNotEmpty)
+              ? product.barcode
+              : (inventoryItem?.tagNumber ?? product.sku ?? '8901234567890');
+        case 'sellingPrice':
+          final price = product.sellingPrice ?? product.mrp;
+          return price != null ? _currencyFormatter.format(price) : null;
+        case 'mrp':
+          final price = product.mrp ?? product.sellingPrice;
+          return price != null ? _currencyFormatter.format(price) : null;
+        case 'weightInG':
+          final wt = inventoryItem?.grossWeight ?? product.weightInG;
+          return wt?.toStringAsFixed(2);
+        case 'hsnCode':
+          return product.hsnCode;
+        case 'gstRate':
+          return product.gstRate != null ? product.gstRate!.toStringAsFixed(0) : '3';
+        case 'brandName':
+          return product.brandName;
+        case 'material':
+          return product.material;
+        case 'size':
+          return product.size;
+        case 'color':
+          return product.color;
+        case 'manufacturerCode':
+          return inventoryItem?.huid ?? product.manufacturerCode;
+        case 'purityFactor':
+          if (inventoryItem?.purity != null) return inventoryItem!.purity;
+          return product.purityFactor != null
+              ? '${(product.purityFactor! * 100).toStringAsFixed(1)}%'
+              : null;
+        case 'currentStock':
+          return product.currentStock?.toString();
+        case 'description':
+          return product.description;
+        default:
+          return null;
+      }
+    }
+
+    if (source == 'inventory' && inventoryItem != null) {
+      switch (fieldKey) {
+        case 'tagNumber':
+          return inventoryItem.tagNumber;
+        case 'huid':
+          return inventoryItem.huid;
+        case 'grossWeight':
+          return inventoryItem.grossWeight?.toStringAsFixed(3);
+        case 'netWeight':
+          return inventoryItem.netWeight?.toStringAsFixed(3);
+        case 'purity':
+          return inventoryItem.purity;
+        default:
+          return null;
+      }
+    }
+
+    return null;
+  }
+
+  /// Resolves an entire LabelDocument against sample data, returning a resolved copy
+  static LabelDocument resolveDocument({
+    required LabelDocument document,
+    Product? product,
+    InventoryItem? inventoryItem,
+  }) {
+    if (product == null && inventoryItem == null) {
+      return document;
+    }
+
+    final resolvedElements = <LabelElement>[];
+
+    for (final elem in document.elements) {
+      if (elem is DynamicTextElement) {
+        final rawVal = resolveFieldValue(
+          source: elem.source,
+          fieldKey: elem.fieldKey,
+          product: product,
+          inventoryItem: inventoryItem,
+        );
+        final formattedText = elem.formatValue(rawVal);
+        resolvedElements.add(
+          TextElement(
+            id: elem.id,
+            xMm: elem.xMm,
+            yMm: elem.yMm,
+            widthMm: elem.widthMm,
+            heightMm: elem.heightMm,
+            rotation: elem.rotation,
+            isLocked: elem.isLocked,
+            zIndex: elem.zIndex,
+            text: formattedText,
+            fontFamily: elem.fontFamily,
+            fontSizePt: elem.fontSizePt,
+            isBold: elem.isBold,
+            isItalic: elem.isItalic,
+            alignment: elem.alignment,
+            borderWidthMm: elem.borderWidthMm,
+            paddingMm: elem.paddingMm,
+          ),
+        );
+      } else if (elem is BarcodeElement) {
+        if (elem.valueType == 'dynamic') {
+          final resolvedVal = resolveFieldValue(
+            source: elem.source,
+            fieldKey: elem.fieldKey,
+            product: product,
+            inventoryItem: inventoryItem,
+          ) ?? elem.staticValue;
+
+          final effectiveBarcode = (resolvedVal.isNotEmpty ? resolvedVal : (product?.sku ?? '8901234567890'))
+              .replaceAll(RegExp(r'[^a-zA-Z0-9\-]'), '');
+
+          resolvedElements.add(
+            elem.copyWithPosition(
+              valueType: 'static',
+              staticValue: effectiveBarcode.isNotEmpty ? effectiveBarcode : '8901234567890',
+            ),
+          );
+        } else {
+          resolvedElements.add(elem);
+        }
+      } else if (elem is QrCodeElement) {
+        if (elem.valueType == 'dynamic') {
+          final resolvedVal = resolveFieldValue(
+            source: elem.source,
+            fieldKey: elem.fieldKey,
+            product: product,
+            inventoryItem: inventoryItem,
+          ) ?? elem.staticValue;
+
+          final effectiveQr = resolvedVal.isNotEmpty ? resolvedVal : (product?.sku ?? '8901234567890');
+
+          resolvedElements.add(
+            elem.copyWithPosition(
+              valueType: 'static',
+              staticValue: effectiveQr,
+            ),
+          );
+        } else {
+          resolvedElements.add(elem);
+        }
+      } else {
+        resolvedElements.add(elem);
+      }
+    }
+
+    return document.copyWith(elements: resolvedElements);
+  }
+}