templates support

Inspectron.Epson.Templates/Validation/TemplateValidationResult.cs

@@ -0,0 +1,35 @@
+namespace Inspectron.Epson.Templates.Validation;
+
+public record TemplateValidationResult(
+    List<TemplateError> Errors,
+    List<TemplateWarning> Warnings)
+{
+    public bool IsValid => Errors.Count == 0;
+    public bool HasWarnings => Warnings.Count > 0;
+
+    public static TemplateValidationResult Valid() => new(new List<TemplateError>(), new List<TemplateWarning>());
+
+    public static TemplateValidationResult WithErrors(params TemplateError[] errors) =>
+        new(errors.ToList(), new List<TemplateWarning>());
+
+    public override string ToString()
+    {
+        if (IsValid && !HasWarnings)
+        {
+            return "Template is valid.";
+        }
+
+        var lines = new List<string>();
+        if (Errors.Count > 0)
+        {
+            lines.Add($"Errors ({Errors.Count}):");
+            lines.AddRange(Errors.Select(e => $"  {e}"));
+        }
+        if (Warnings.Count > 0)
+        {
+            lines.Add($"Warnings ({Warnings.Count}):");
+            lines.AddRange(Warnings.Select(w => $"  {w}"));
+        }
+        return string.Join(Environment.NewLine, lines);
+    }
+}