From c31e91ce42fc00079e0ee23f93e337846eea00ad Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Tue, 21 Apr 2026 10:41:48 +0300
Subject: fix r7 custom prompt translation drift

---
 internal/image/gemini_prompt.go |  5 +++++
 internal/image/gemini_test.go   | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/internal/image/gemini_prompt.go b/internal/image/gemini_prompt.go
index 09c54c7..5932174 100644
--- a/internal/image/gemini_prompt.go
+++ b/internal/image/gemini_prompt.go
@@ -42,6 +42,11 @@ func (c *GeminiProvider) buildPrompt(ctx context.Context, opts *SearchOptions) (
 	}
 
 	translation := strings.TrimSpace(opts.Translation)
+	if customPrompt := normalizeCustomPrompt(opts.CustomPrompt); customPrompt != "" {
+		fmt.Printf("Using custom prompt: %s\n", customPrompt)
+		return customPrompt, translation, nil
+	}
+
 	translatedWord, err := c.resolveTranslation(ctx, opts, translation)
 	if err != nil {
 		return "", "", err
diff --git a/internal/image/gemini_test.go b/internal/image/gemini_test.go
index 70bd424..aae8014 100644
--- a/internal/image/gemini_test.go
+++ b/internal/image/gemini_test.go
@@ -114,6 +114,39 @@ func TestGeminiProvider_Search_CustomPromptSkipsTextGeneration(t *testing.T) {
 	}
 }
 
+func TestGeminiProvider_Search_CustomPromptWithoutTranslationKeepsDescriptionSimple(t *testing.T) {
+	originalText := geminiGenerateText
+	originalImage := geminiGenerateImage
+	t.Cleanup(func() {
+		geminiGenerateText = originalText
+		geminiGenerateImage = originalImage
+	})
+
+	geminiGenerateText = func(context.Context, *GeminiProvider, string, string, string, float32, int32) (string, error) {
+		t.Fatal("unexpected text generation for custom prompt")
+		return "", nil
+	}
+
+	geminiGenerateImage = func(_ context.Context, _ *GeminiProvider, _ string, _ string) ([]byte, string, error) {
+		return mustJPEGBytes(t), "image/jpeg", nil
+	}
+
+	client := NewGeminiProvider(&GeminiConfig{APIKey: "test-key"})
+	results, err := client.Search(context.Background(), &SearchOptions{
+		Query:        "ябълка",
+		CustomPrompt: "custom flashcard prompt",
+	})
+	if err != nil {
+		t.Fatalf("Search() unexpected error: %v", err)
+	}
+	if len(results) != 1 {
+		t.Fatalf("expected 1 result, got %d", len(results))
+	}
+	if got := results[0].Description; got != "Generated educational image for ябълка" {
+		t.Fatalf("Description = %q, want %q", got, "Generated educational image for ябълка")
+	}
+}
+
 func TestGeminiProvider_Search_CustomPromptIsTruncated(t *testing.T) {
 	originalText := geminiGenerateText
 	originalImage := geminiGenerateImage
-- 
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