refactor(task-376): share audio attribution builder

3 files changed, 68 insertions, 27 deletions

diff --git a/internal/audio/attribution.go b/internal/audio/attribution.go
new file mode 100644
index 0000000..80f2bc3
--- /dev/null
+++ b/internal/audio/attribution.go
@@ -0,0 +1,49 @@
+package audio
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+// AttributionParams describes metadata included in OpenAI TTS attribution files.
+type AttributionParams struct {
+	Word          string
+	Model         string
+	Voice         string
+	Instruction   string
+	ProcessedText string
+	Speed         float64
+	GeneratedAt   time.Time
+}
+
+// AttributionPath returns the sidecar attribution file path for a generated audio file.
+func AttributionPath(audioFile string) string {
+	return strings.TrimSuffix(audioFile, filepath.Ext(audioFile)) + "_attribution.txt"
+}
+
+// BuildOpenAIAttribution builds the attribution content for OpenAI-generated audio.
+func BuildOpenAIAttribution(params AttributionParams) string {
+	var b strings.Builder
+	b.WriteString("Audio generated by OpenAI TTS\n\n")
+	fmt.Fprintf(&b, "Bulgarian word: %s\n", params.Word)
+	fmt.Fprintf(&b, "Model: %s\n", params.Model)
+	fmt.Fprintf(&b, "Voice: %s\n", params.Voice)
+	fmt.Fprintf(&b, "Speed: %.2f\n", params.Speed)
+
+	if params.Instruction != "" {
+		fmt.Fprintf(&b, "\nVoice instructions:\n%s\n", params.Instruction)
+	}
+	if params.ProcessedText != "" {
+		fmt.Fprintf(&b, "\nProcessed text sent to TTS: %s\n", params.ProcessedText)
+	}
+
+	generatedAt := params.GeneratedAt
+	if generatedAt.IsZero() {
+		generatedAt = time.Now()
+	}
+	fmt.Fprintf(&b, "\nGenerated at: %s\n", generatedAt.Format("2006-01-02 15:04:05"))
+
+	return b.String()
+}
diff --git a/internal/gui/generator.go b/internal/gui/generator.go
index 14f0f60..09ff534 100644
--- a/internal/gui/generator.go
+++ b/internal/gui/generator.go
@@ -367,20 +367,17 @@ func (a *Application) generateImagesWithPrompt(ctx context.Context, word string,
 
 // saveAudioAttribution saves attribution info for generated audio
 func (a *Application) saveAudioAttribution(word, audioFile, voice string, speed float64) error {
-	attribution := fmt.Sprintf("Audio generated by OpenAI TTS\n\n")
-	attribution += fmt.Sprintf("Bulgarian word: %s\n", word)
-	attribution += fmt.Sprintf("Model: %s\n", a.audioConfig.OpenAIModel)
-	attribution += fmt.Sprintf("Voice: %s\n", voice)
-	attribution += fmt.Sprintf("Speed: %.2f\n", speed)
-
-	if a.audioConfig.OpenAIInstruction != "" {
-		attribution += fmt.Sprintf("\nVoice instructions:\n%s\n", a.audioConfig.OpenAIInstruction)
-	}
-
-	attribution += fmt.Sprintf("\nGenerated at: %s\n", time.Now().Format("2006-01-02 15:04:05"))
+	attribution := audio.BuildOpenAIAttribution(audio.AttributionParams{
+		Word:        word,
+		Model:       a.audioConfig.OpenAIModel,
+		Voice:       voice,
+		Speed:       speed,
+		Instruction: a.audioConfig.OpenAIInstruction,
+		GeneratedAt: time.Now(),
+	})
 
 	// Save to file
-	attrPath := strings.TrimSuffix(audioFile, filepath.Ext(audioFile)) + "_attribution.txt"
+	attrPath := audio.AttributionPath(audioFile)
 	if err := os.WriteFile(attrPath, []byte(attribution), 0644); err != nil {
 		return fmt.Errorf("failed to write audio attribution file: %w", err)
 	}
diff --git a/internal/processor/processor.go b/internal/processor/processor.go
index 3b49cf0..d52ca53 100644
--- a/internal/processor/processor.go
+++ b/internal/processor/processor.go
@@ -728,17 +728,6 @@ func (p *Processor) isWordFullyProcessed(word string) bool {
 	return true // All required files exist
 }
 func (p *Processor) saveAudioAttribution(word, audioFile string, config *audio.Config) error {
-	// Create attribution text
-	attribution := fmt.Sprintf("Audio generated by OpenAI TTS\n\n")
-	attribution += fmt.Sprintf("Bulgarian word: %s\n", word)
-	attribution += fmt.Sprintf("Model: %s\n", config.OpenAIModel)
-	attribution += fmt.Sprintf("Voice: %s\n", config.OpenAIVoice)
-	attribution += fmt.Sprintf("Speed: %.2f\n", config.OpenAISpeed)
-
-	if config.OpenAIInstruction != "" {
-		attribution += fmt.Sprintf("\nVoice instructions:\n%s\n", config.OpenAIInstruction)
-	}
-
 	// Add preprocessing information
 	cleanedWord := strings.TrimSpace(word)
 	punctuationToRemove := []string{"!", "?", ".", ",", ";", ":", "\"", "'", "(", ")", "[", "]", "{", "}", "-", "—", "–"}
@@ -746,12 +735,18 @@ func (p *Processor) saveAudioAttribution(word, audioFile string, config *audio.C
 		cleanedWord = strings.ReplaceAll(cleanedWord, punct, "")
 	}
 	processedText := fmt.Sprintf("%s...", strings.TrimSpace(cleanedWord))
-	attribution += fmt.Sprintf("\nProcessed text sent to TTS: %s\n", processedText)
-
-	attribution += fmt.Sprintf("\nGenerated at: %s\n", time.Now().Format("2006-01-02 15:04:05"))
+	attribution := audio.BuildOpenAIAttribution(audio.AttributionParams{
+		Word:          word,
+		Model:         config.OpenAIModel,
+		Voice:         config.OpenAIVoice,
+		Speed:         config.OpenAISpeed,
+		Instruction:   config.OpenAIInstruction,
+		ProcessedText: processedText,
+		GeneratedAt:   time.Now(),
+	})
 
 	// Save to file
-	attrPath := strings.TrimSuffix(audioFile, filepath.Ext(audioFile)) + "_attribution.txt"
+	attrPath := audio.AttributionPath(audioFile)
 	if err := os.WriteFile(attrPath, []byte(attribution), 0644); err != nil {
 		return fmt.Errorf("failed to write audio attribution file: %w", err)
 	}