task 002: centralize Gemini voice fallbacks

1 files changed, 29 insertions, 0 deletions

diff --git a/internal/audio/fallbacks.go b/internal/audio/fallbacks.go
new file mode 100644
index 0000000..bd0c86e
--- /dev/null
+++ b/internal/audio/fallbacks.go
@@ -0,0 +1,29 @@
+package audio
+
+import (
+	"fmt"
+	"strings"
+)
+
+// RunWithVoiceFallbacks tries the selected Gemini voice first, then the remaining known voices.
+func RunWithVoiceFallbacks(initialVoice string, generate func(voice string) error) (usedVoice string, err error) {
+	attempted := make([]string, 0, len(GeminiVoices))
+	var lastErr error
+
+	for _, voice := range GeminiVoiceFallbacks(initialVoice) {
+		attempted = append(attempted, voice)
+
+		err := generate(voice)
+		if err == nil {
+			return voice, nil
+		}
+		if !IsGeminiNoAudioDataError(err) {
+			return "", err
+		}
+
+		lastErr = err
+		fmt.Printf("Warning: Gemini returned no audio for voice %s\n", voice)
+	}
+
+	return "", fmt.Errorf("Gemini returned no audio for voices %s: %w", strings.Join(attempted, ", "), lastErr)
+}