From 78de014b7dd8eaf05afdc7342a255a977363d53b Mon Sep 17 00:00:00 2001
From: Bruno Albuquerque <bga@gmail.com>
Date: Wed, 25 Mar 2026 09:57:37 -0400
Subject: [PATCH] fix(engine): delegate customDiffPatch.summary() to inner
 patch's Summary()

Previously the method returned a hardcoded "CustomPatch" string. It now
performs a type assertion against a local summarizer interface and calls
Summary() on the inner patch when available, falling back to "CustomPatch"
otherwise. Adds tests for both branches.
---
 internal/engine/patch_ops.go  |  6 ++++++
 internal/engine/patch_test.go | 20 ++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/internal/engine/patch_ops.go b/internal/engine/patch_ops.go
index fce4f46..708db0e 100644
--- a/internal/engine/patch_ops.go
+++ b/internal/engine/patch_ops.go
@@ -1630,5 +1630,11 @@ func (p *customDiffPatch) toJSONPatch(path string) []map[string]any {
 }
 
 func (p *customDiffPatch) summary(path string) string {
+	type summarizer interface {
+		Summary() string
+	}
+	if s, ok := p.patch.(summarizer); ok {
+		return s.Summary()
+	}
 	return "CustomPatch"
 }
diff --git a/internal/engine/patch_test.go b/internal/engine/patch_test.go
index b2aafcf..0863a09 100644
--- a/internal/engine/patch_test.go
+++ b/internal/engine/patch_test.go
@@ -322,6 +322,26 @@ func TestCustomDiffPatch_ToJSONPatch(t *testing.T) {
 	}
 }
 
+func TestCustomDiffPatch_Summary(t *testing.T) {
+	t.Run("delegates to inner Summary", func(t *testing.T) {
+		custom := &customDiffPatch{patch: summarizerFunc("Text update")}
+		if got := custom.summary(""); got != "Text update" {
+			t.Errorf("expected %q, got %q", "Text update", got)
+		}
+	})
+
+	t.Run("falls back to CustomPatch when no Summary method", func(t *testing.T) {
+		custom := &customDiffPatch{patch: struct{}{}}
+		if got := custom.summary(""); got != "CustomPatch" {
+			t.Errorf("expected %q, got %q", "CustomPatch", got)
+		}
+	})
+}
+
+type summarizerFunc string
+
+func (s summarizerFunc) Summary() string { return string(s) }
+
 func TestPatch_Summary(t *testing.T) {
 	type Config struct {
 		Name    string