class DynamicFieldDefinition {
  final String source; // e.g. "product"
  final String fieldKey; // e.g. "name", "sellingPrice", "barcode"
  final String displayName; // e.g. "Product Name"
  final String category; // e.g. "Identification", "Pricing", "Specifications"
  final String dataType; // "string", "currency", "weight", "number"
  final bool isBarcodeCompatible;
  final String? defaultPrefix;
  final String? defaultSuffix;

  const DynamicFieldDefinition({
    required this.source,
    required this.fieldKey,
    required this.displayName,
    required this.category,
    this.dataType = 'string',
    this.isBarcodeCompatible = false,
    this.defaultPrefix,
    this.defaultSuffix,
  });

  String get placeholder => '{{$source.$fieldKey}}';

  static const List<DynamicFieldDefinition> productFields = [
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'name',
      displayName: 'Product Name',
      category: 'General',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'sku',
      displayName: 'SKU',
      category: 'Identification',
      dataType: 'string',
      isBarcodeCompatible: true,
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'barcode',
      displayName: 'Barcode',
      category: 'Identification',
      dataType: 'string',
      isBarcodeCompatible: true,
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'sellingPrice',
      displayName: 'Selling Price',
      category: 'Pricing',
      dataType: 'currency',
      defaultPrefix: '₹',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'mrp',
      displayName: 'MRP',
      category: 'Pricing',
      dataType: 'currency',
      defaultPrefix: 'MRP ₹',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'weightInG',
      displayName: 'Weight',
      category: 'Measurements',
      dataType: 'weight',
      defaultSuffix: ' g',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'hsnCode',
      displayName: 'HSN Code',
      category: 'Tax & Compliance',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'gstRate',
      displayName: 'GST Rate',
      category: 'Tax & Compliance',
      dataType: 'number',
      defaultSuffix: '%',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'brandName',
      displayName: 'Brand',
      category: 'General',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'material',
      displayName: 'Material / Metal',
      category: 'Specifications',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'size',
      displayName: 'Size',
      category: 'Specifications',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'color',
      displayName: 'Color',
      category: 'Specifications',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'manufacturerCode',
      displayName: 'Tag / Serial / Code',
      category: 'Identification',
      dataType: 'string',
      isBarcodeCompatible: true,
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'purityFactor',
      displayName: 'Purity Factor',
      category: 'Specifications',
      dataType: 'number',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'description',
      displayName: 'Description',
      category: 'General',
      dataType: 'string',
    ),
    DynamicFieldDefinition(
      source: 'product',
      fieldKey: 'currentStock',
      displayName: 'Current Stock',
      category: 'Inventory',
      dataType: 'number',
    ),
  ];

  static DynamicFieldDefinition? find(String source, String fieldKey) {
    if (source == 'product') {
      return productFields.where((f) => f.fieldKey == fieldKey).firstOrNull;
    }
    return null;
  }
}