feat: add p-rec-annot line-number command preview service

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Abstractions/Contracts.cs

@@ -62,6 +62,7 @@ public sealed record LineNumberCommandPlan(IReadOnlyList<LineNumberCommandOperat
 public sealed record LineNumberApplyPreflight(string StableId, int MarkerNumber, string Text, AnnotationPoint Position, double Rotation, string Layer, string TextStyle);
 public sealed record LineNumberApplyResult(int Created, int Updated, int Unchanged);
 public sealed record LineNumberListApplyPreflight(string StableId, AnnotationPoint Position, double Rotation, IReadOnlyList<LineNumberApplyPreflight> Rows);
+public sealed record LineNumberPreviewResult(bool Success, LineNumberCommandPlan? Plan, IReadOnlyList<LineNumberApplyPreflight> Apply, string? FailureCode = null);
 public sealed record LineNumberTextAsset(string Layer, string TextStyle, double Size, string TextValue, Point2Dto Position);
 public sealed record LineNumberLineAsset(string Layer, Point2Dto Start, Point2Dto End);
 public sealed record LineNumberMarkerAsset(string Layer, double MaskScaleFactor, IReadOnlyList<LineNumberTextAsset> Texts, IReadOnlyList<LineNumberLineAsset> Lines);

Plant3D2026/P_Rec_Annot/src/PRecAnnot.Core/LineNumberCommandPreviewService.cs

@@ -0,0 +1,20 @@
+using PRecAnnot.Abstractions;
+
+namespace PRecAnnot.Core;
+
+public sealed class LineNumberCommandPreviewService(LineNumberCommandPlanner planner, LineNumberFieldResolver fieldResolver)
+{
+    public LineNumberPreviewResult Preview(LineNumberAnnotationDefinition definition, IEnumerable<LineNumberCandidate> candidates, IEnumerable<ExistingLineNumberAnnotation> existing)
+    {
+        var resolved = new List<LineNumberCandidate>();
+        foreach (var candidate in candidates.OrderBy(item => item.StableId, StringComparer.Ordinal))
+        {
+            var fields = definition.Tags.Select(tag => tag.Field).Where(field => !string.IsNullOrWhiteSpace(field));
+            var properties = fieldResolver.Resolve(candidate.RowId, fields);
+            if (!properties.Success) return new(false, null, Array.Empty<LineNumberApplyPreflight>(), properties.FailureCode);
+            resolved.Add(candidate with { Properties = properties.Values });
+        }
+        var plan = planner.Build(definition, resolved, existing);
+        return new(true, plan, LineNumberCommandPlanner.PrepareApply(plan));
+    }
+}

Plant3D2026/P_Rec_Annot/tests/PRecAnnot.Core.Tests/LineNumberCommandPreviewServiceTests.cs

@@ -0,0 +1,35 @@
+using PRecAnnot.Abstractions;
+using PRecAnnot.Core;
+
+namespace PRecAnnot.Core.Tests;
+
+public sealed class LineNumberCommandPreviewServiceTests
+{
+    [Fact]
+    public void UsesTheSameResolvedPropertiesForPreviewAndApply()
+    {
+        var reader = new FakeReader(new(true, new Dictionary<string, string?> { ["EngineeringItems.LineNumber"] = "L-42" }));
+        var service = new LineNumberCommandPreviewService(new(new LineNumberAnnotationFormatter()), new(reader));
+        var definition = new LineNumberAnnotationDefinition { Nickname = "LN", Tags = [new() { Field = "EngineeringItems.LineNumber" }] };
+        var candidate = new LineNumberCandidate("component", 42, new(1, 2), 0, "PXP", "Standard", new Dictionary<string, string?>());
+        var result = service.Preview(definition, [candidate], Array.Empty<ExistingLineNumberAnnotation>());
+        Assert.True(result.Success);
+        Assert.Equal("L-42", Assert.Single(result.Apply).Text);
+        Assert.Equal(42, reader.LastRowId);
+    }
+
+    [Fact]
+    public void PropagatesTypedDataLinksFailureWithoutPlanning()
+    {
+        var service = new LineNumberCommandPreviewService(new(new LineNumberAnnotationFormatter()), new(new FakeReader(new(false, new Dictionary<string, string?>(), "DATALINKS_PROPERTY_READ_FAILED"))));
+        var definition = new LineNumberAnnotationDefinition { Nickname = "LN", Tags = [new() { Field = "EngineeringItems.LineNumber" }] };
+        var candidate = new LineNumberCandidate("component", 42, new(), 0, "PXP", "Standard", new Dictionary<string, string?>());
+        Assert.Equal("DATALINKS_PROPERTY_READ_FAILED", service.Preview(definition, [candidate], Array.Empty<ExistingLineNumberAnnotation>()).FailureCode);
+    }
+
+    private sealed class FakeReader(DataLinksPropertyReadResult result) : IDataLinksPropertyReader
+    {
+        public long LastRowId { get; private set; }
+        public DataLinksPropertyReadResult ReadProperties(long rowId) { LastRowId = rowId; return result; }
+    }
+}