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package audio
import (
"context"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"github.com/sashabaranov/go-openai"
)
// Compile-time check that OpenAIProvider implements the Provider interface.
var _ Provider = (*OpenAIProvider)(nil)
// OpenAIProvider implements Provider interface for OpenAI TTS.
// It stores only the OpenAI-specific sub-config so it never sees Gemini fields.
type OpenAIProvider struct {
client *openai.Client
config OpenAIAudioConfig
outputFormat string
}
// NewOpenAIProvider creates a new OpenAI TTS provider from the OpenAI-specific
// sub-config. Callers that have a flat Config should use NewProvider instead.
func NewOpenAIProvider(config OpenAIAudioConfig, outputFormat string) (Provider, error) {
if config.Key == "" {
return nil, errors.New("OpenAI API key is required")
}
return &OpenAIProvider{
client: openai.NewClient(config.Key),
config: config,
outputFormat: outputFormat,
}, nil
}
// GenerateAudio generates audio using OpenAI TTS
func (p *OpenAIProvider) GenerateAudio(ctx context.Context, text string, outputFile string) error {
// Validate Bulgarian text
if err := ValidateBulgarianText(text); err != nil {
return err
}
// Preprocess text for clearer Bulgarian pronunciation
processedText := p.preprocessBulgarianText(text)
// Prepare the TTS request
// OpenAI TTS will automatically detect and pronounce Bulgarian text
fmt.Printf("OpenAI TTS: Using model '%s' with voice '%s' at speed %.2f\n", p.config.Model, p.config.Voice, p.config.Speed)
if p.config.Instruction != "" && (p.config.Model == "gpt-4o-mini-tts" || p.config.Model == "gpt-4o-mini-audio-preview") {
fmt.Printf("OpenAI TTS Instruction: '%s'\n", p.config.Instruction)
}
fmt.Printf("OpenAI TTS Input: '%s'\n", processedText)
req := openai.CreateSpeechRequest{
Model: openai.SpeechModel(p.config.Model),
Input: processedText,
Voice: openai.SpeechVoice(p.config.Voice),
Speed: p.config.Speed,
}
// Add instructions for gpt-4o-mini-tts model
if p.config.Instruction != "" && (p.config.Model == "gpt-4o-mini-tts" || p.config.Model == "gpt-4o-mini-audio-preview") {
req.Instructions = p.config.Instruction
}
// Determine response format based on output file extension
ext := strings.ToLower(filepath.Ext(outputFile))
switch ext {
case ".mp3":
req.ResponseFormat = openai.SpeechResponseFormatMp3
case ".wav":
req.ResponseFormat = openai.SpeechResponseFormatWav
case ".opus":
req.ResponseFormat = openai.SpeechResponseFormatOpus
case ".aac":
req.ResponseFormat = openai.SpeechResponseFormatAac
case ".flac":
req.ResponseFormat = openai.SpeechResponseFormatFlac
default:
req.ResponseFormat = openai.SpeechResponseFormatMp3
if !strings.HasSuffix(outputFile, ".mp3") {
outputFile += ".mp3"
}
}
// Make the API call
response, err := p.client.CreateSpeech(ctx, req)
if err != nil {
// Check if it's a model access error
errStr := err.Error()
if strings.Contains(errStr, "does not have access to model") && (p.config.Model == "gpt-4o-mini-tts" || p.config.Model == "gpt-4o-mini-audio-preview") {
return fmt.Errorf("OpenAI TTS API error: %w\nNote: The %s model requires access. Try using --openai-model tts-1-hd instead", err, p.config.Model)
}
return err
}
defer func() {
_ = response.Close()
}()
// Ensure output directory exists
dir := filepath.Dir(outputFile)
if dir != "" && dir != "." {
if err := os.MkdirAll(dir, 0755); err != nil {
return fmt.Errorf("failed to create output directory: %w", err)
}
}
// Create output file
out, err := os.Create(outputFile)
if err != nil {
return fmt.Errorf("failed to create output file: %w", err)
}
defer func() {
_ = out.Close()
}()
// Copy the audio data
written, err := io.Copy(out, response)
if err != nil {
return fmt.Errorf("failed to write audio file: %w", err)
}
if written == 0 {
return errors.New("no audio data received from OpenAI")
}
return nil
}
// Name returns the provider name
func (p *OpenAIProvider) Name() string {
return "openai"
}
// IsAvailable checks if the OpenAI API is accessible
func (p *OpenAIProvider) IsAvailable() error {
if p.config.Key == "" {
return errors.New("OpenAI API key not configured")
}
// We could make a test API call here, but that would use credits
// For now, just check that we have a key
return nil
}
// Voices returns the list of OpenAI voices supported by the app.
func (p *OpenAIProvider) Voices() []string {
return OpenAIVoices
}
// BuildAttribution returns the OpenAI attribution text for a generated audio file.
func (p *OpenAIProvider) BuildAttribution(params AttributionParams) string {
return BuildOpenAIAttribution(params)
}
// preprocessBulgarianText prepares Bulgarian text for clearer TTS pronunciation
func (p *OpenAIProvider) preprocessBulgarianText(text string) string {
return openAIProcessedText(text)
}
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