Regelsteuerung grafisch und per C# Templates

TrafagSalesExporter/Services/TransformationStrategies.cs

@@ -1,38 +1,46 @@
+using TrafagSalesExporter.Models;
+
 namespace TrafagSalesExporter.Services;
 
 public sealed class CopyTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Copy";
+    public string Description => "Kopiert Source nach Target.";
     public object? Transform(object? sourceValue, string? argument) => sourceValue;
 }
 
 public sealed class UppercaseTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Uppercase";
+    public string Description => "Wandelt Text in Grossbuchstaben.";
     public object? Transform(object? sourceValue, string? argument) => sourceValue?.ToString()?.ToUpperInvariant();
 }
 
 public sealed class LowercaseTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Lowercase";
+    public string Description => "Wandelt Text in Kleinbuchstaben.";
     public object? Transform(object? sourceValue, string? argument) => sourceValue?.ToString()?.ToLowerInvariant();
 }
 
 public sealed class PrefixTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Prefix";
+    public string Description => "Stellt Argument vor den Source-Wert.";
     public object? Transform(object? sourceValue, string? argument) => $"{argument}{sourceValue}";
 }
 
 public sealed class SuffixTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Suffix";
+    public string Description => "Haengt Argument an den Source-Wert.";
     public object? Transform(object? sourceValue, string? argument) => $"{sourceValue}{argument}";
 }
 
 public sealed class ReplaceTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Replace";
+    public string Description => "Ersetzt in Text mit Syntax alt=>neu.";
 
     public object? Transform(object? sourceValue, string? argument)
     {
@@ -54,5 +62,54 @@ public sealed class ReplaceTransformationStrategy : ITransformationStrategy
 public sealed class ConstantTransformationStrategy : ITransformationStrategy
 {
     public string TransformationType => "Constant";
+    public string Description => "Setzt das Target auf einen konstanten Wert aus Argument.";
     public object? Transform(object? sourceValue, string? argument) => argument;
 }
+
+public sealed class FirstNonEmptyRecordTransformationStrategy : IRecordTransformationStrategy
+{
+    public string TransformationType => "FirstNonEmpty";
+    public string Description => "Record-Strategie: setzt Target aus dem ersten nicht-leeren Feld aus Argument, z.B. CustomerName|SupplierName|Name.";
+
+    public void Transform(SalesRecord record, FieldTransformationRule rule)
+    {
+        if (string.IsNullOrWhiteSpace(rule.TargetField) || string.IsNullOrWhiteSpace(rule.Argument))
+            return;
+
+        var propertyMap = RecordTransformationService.PropertyMap;
+        if (!propertyMap.TryGetValue(rule.TargetField, out var targetProperty))
+            return;
+
+        var sourceFields = rule.Argument
+            .Split(['|', ',', ';'], StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+        foreach (var sourceField in sourceFields)
+        {
+            if (!propertyMap.TryGetValue(sourceField, out var sourceProperty))
+                continue;
+
+            var value = sourceProperty.GetValue(record);
+            if (IsMeaningfulValue(value))
+            {
+                RecordTransformationService.SetPropertyValue(record, targetProperty, value);
+                return;
+            }
+        }
+    }
+
+    private static bool IsMeaningfulValue(object? value)
+    {
+        if (value is null)
+            return false;
+        if (value is string text)
+            return !string.IsNullOrWhiteSpace(text);
+        if (value is DateTime date)
+            return date != default;
+        if (value is decimal decimalNumber)
+            return decimalNumber != 0m;
+        if (value is int intNumber)
+            return intNumber != 0;
+
+        return true;
+    }
+}