refactor: consolidate OpenAI adapter to accept EndpointConfig

- OpenAIAdapter now accepts EndpointConfig for custom endpoints
- added language code conversion via ToProviderFormat
- backward-compatible NewOpenAIAdapterFromConfig for migration
- works with OpenAI, Groq, and Mistral endpoints

internal/transcriber/adapter_openai.go

@@ -8,23 +8,56 @@ import (
 	"strings"
 	"time"
 
+	"github.com/leonardotrapani/hyprvoice/internal/language"
+	"github.com/leonardotrapani/hyprvoice/internal/provider"
 	"github.com/sashabaranov/go-openai"
 )
 
-// OpenAIAdapter implements BatchAdapter for OpenAI Whisper API
+// OpenAIAdapter implements BatchAdapter for any OpenAI-compatible API
+// Works with OpenAI, Groq, Mistral, and any other OpenAI-compatible endpoint
 type OpenAIAdapter struct {
 	client       *openai.Client
-	config Config
+	model        string
+	language     string
+	keywords     []string
+	providerName string
 }
 
-func NewOpenAIAdapter(config Config) *OpenAIAdapter {
-	client := openai.NewClient(config.APIKey)
+// NewOpenAIAdapter creates an adapter for OpenAI-compatible transcription APIs
+// endpoint: the BaseURL for the API (e.g., "https://api.openai.com", "https://api.groq.com/openai")
+// apiKey: the API key for authentication
+// model: model ID to use
+// lang: canonical language code (will be converted to provider format)
+// keywords: optional spelling hints
+// providerName: used for logging and language format conversion
+func NewOpenAIAdapter(endpoint *provider.EndpointConfig, apiKey, model, lang string, keywords []string, providerName string) *OpenAIAdapter {
+	var client *openai.Client
+
+	if endpoint != nil && endpoint.BaseURL != "" {
+		// use custom endpoint
+		clientConfig := openai.DefaultConfig(apiKey)
+		clientConfig.BaseURL = endpoint.BaseURL + "/v1"
+		client = openai.NewClientWithConfig(clientConfig)
+	} else {
+		// default to OpenAI
+		client = openai.NewClient(apiKey)
+	}
+
 	return &OpenAIAdapter{
 		client:       client,
-		config: config,
+		model:        model,
+		language:     lang,
+		keywords:     keywords,
+		providerName: providerName,
 	}
 }
 
+// NewOpenAIAdapterFromConfig creates an adapter using the legacy Config struct
+// This is for backwards compatibility during migration
+func NewOpenAIAdapterFromConfig(config Config) *OpenAIAdapter {
+	return NewOpenAIAdapter(nil, config.APIKey, config.Model, config.Language, config.Keywords, "openai")
+}
+
 func (a *OpenAIAdapter) Transcribe(ctx context.Context, audioData []byte) (string, error) {
 	if len(audioData) == 0 {
 		return "", nil
@@ -36,17 +69,20 @@ func (a *OpenAIAdapter) Transcribe(ctx context.Context, audioData []byte) (strin
 		return "", fmt.Errorf("convert to WAV: %w", err)
 	}
 
+	// Convert language code to provider format
+	providerLang := language.ToProviderFormat(a.language, a.providerName)
+
 	// Create transcription request
 	req := openai.AudioRequest{
-		Model:    a.config.Model,
+		Model:    a.model,
 		Reader:   bytes.NewReader(wavData),
 		FilePath: "audio.wav",
-		Language: a.config.Language,
+		Language: providerLang,
 	}
 
 	// Add keywords as initial_prompt to help with spelling hints
-	if len(a.config.Keywords) > 0 {
-		req.Prompt = strings.Join(a.config.Keywords, ", ")
+	if len(a.keywords) > 0 {
+		req.Prompt = strings.Join(a.keywords, ", ")
 	}
 
 	start := time.Now()
@@ -54,10 +90,10 @@ func (a *OpenAIAdapter) Transcribe(ctx context.Context, audioData []byte) (strin
 	duration := time.Since(start)
 
 	if err != nil {
-		log.Printf("openai-adapter: API call failed after %v: %v", duration, err)
-		return "", fmt.Errorf("openai transcription: %w", err)
+		log.Printf("%s-adapter: API call failed after %v: %v", a.providerName, duration, err)
+		return "", fmt.Errorf("%s transcription: %w", a.providerName, err)
 	}
 
-	log.Printf("openai-adapter: transcribed %d bytes in %v: %q", len(audioData), duration, resp.Text)
+	log.Printf("%s-adapter: transcribed %d bytes in %v: %q", a.providerName, len(audioData), duration, resp.Text)
 	return resp.Text, nil
 }

internal/transcriber/transcriber.go

@@ -38,7 +38,7 @@ func NewTranscriber(config Config) (Transcriber, error) {
 		if config.APIKey == "" {
 			return nil, fmt.Errorf("OpenAI API key required")
 		}
-		adapter = NewOpenAIAdapter(config)
+		adapter = NewOpenAIAdapterFromConfig(config)
 
 	case "groq-transcription":
 		if config.APIKey == "" {

internal/transcriber/transcriber_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/leonardotrapani/hyprvoice/internal/provider"
 	"github.com/leonardotrapani/hyprvoice/internal/recording"
 )
 
@@ -498,6 +499,118 @@ func TestTranscriptionAdapter(t *testing.T) {
 	}
 }
 
+func TestOpenAIAdapter_Creation(t *testing.T) {
+	tests := []struct {
+		name         string
+		endpoint     *provider.EndpointConfig
+		apiKey       string
+		model        string
+		language     string
+		keywords     []string
+		providerName string
+	}{
+		{
+			name:         "openai with nil endpoint uses default",
+			endpoint:     nil,
+			apiKey:       "sk-test-key",
+			model:        "whisper-1",
+			language:     "en",
+			keywords:     []string{"hello", "world"},
+			providerName: "openai",
+		},
+		{
+			name:         "openai with explicit endpoint",
+			endpoint:     &provider.EndpointConfig{BaseURL: "https://api.openai.com", Path: "/v1/audio/transcriptions"},
+			apiKey:       "sk-test-key",
+			model:        "whisper-1",
+			language:     "es",
+			keywords:     nil,
+			providerName: "openai",
+		},
+		{
+			name:         "groq with custom endpoint",
+			endpoint:     &provider.EndpointConfig{BaseURL: "https://api.groq.com/openai", Path: "/v1/audio/transcriptions"},
+			apiKey:       "gsk-test-key",
+			model:        "whisper-large-v3",
+			language:     "fr",
+			keywords:     []string{"bonjour"},
+			providerName: "groq",
+		},
+		{
+			name:         "mistral with custom endpoint",
+			endpoint:     &provider.EndpointConfig{BaseURL: "https://api.mistral.ai", Path: "/v1/audio/transcriptions"},
+			apiKey:       "mistral-test-key",
+			model:        "voxtral-mini-latest",
+			language:     "de",
+			keywords:     nil,
+			providerName: "mistral",
+		},
+		{
+			name:         "auto language",
+			endpoint:     nil,
+			apiKey:       "sk-test-key",
+			model:        "whisper-1",
+			language:     "", // auto
+			keywords:     nil,
+			providerName: "openai",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			adapter := NewOpenAIAdapter(tt.endpoint, tt.apiKey, tt.model, tt.language, tt.keywords, tt.providerName)
+			if adapter == nil {
+				t.Errorf("NewOpenAIAdapter() returned nil")
+				return
+			}
+
+			if adapter.model != tt.model {
+				t.Errorf("model = %q, want %q", adapter.model, tt.model)
+			}
+
+			if adapter.language != tt.language {
+				t.Errorf("language = %q, want %q", adapter.language, tt.language)
+			}
+
+			if adapter.providerName != tt.providerName {
+				t.Errorf("providerName = %q, want %q", adapter.providerName, tt.providerName)
+			}
+
+			if len(adapter.keywords) != len(tt.keywords) {
+				t.Errorf("keywords len = %d, want %d", len(adapter.keywords), len(tt.keywords))
+			}
+		})
+	}
+}
+
+func TestOpenAIAdapterFromConfig(t *testing.T) {
+	config := Config{
+		Provider: "openai",
+		APIKey:   "sk-test-key",
+		Model:    "whisper-1",
+		Language: "en",
+		Keywords: []string{"test"},
+	}
+
+	adapter := NewOpenAIAdapterFromConfig(config)
+	if adapter == nil {
+		t.Errorf("NewOpenAIAdapterFromConfig() returned nil")
+		return
+	}
+
+	if adapter.model != config.Model {
+		t.Errorf("model = %q, want %q", adapter.model, config.Model)
+	}
+
+	if adapter.language != config.Language {
+		t.Errorf("language = %q, want %q", adapter.language, config.Language)
+	}
+
+	if adapter.providerName != "openai" {
+		t.Errorf("providerName = %q, want %q", adapter.providerName, "openai")
+	}
+}
+
 // MockStreamingAdapter implements StreamingAdapter for testing
 type MockStreamingAdapter struct {
 	StartFunc     func(ctx context.Context, language string) error

progress.txt

@@ -104,3 +104,14 @@ Started: Sun Feb  1 12:22:47 AM CET 2026
 - SupportedLanguages set to all 57 language codes
 - Added TestElevenLabsProvider test verifying all requirements
 - All tests passing, typecheck passes
+
+### Task 12: Create consolidated OpenAI-compatible BatchAdapter
+- Refactored `internal/transcriber/adapter_openai.go` to be configurable
+- New constructor: `NewOpenAIAdapter(endpoint *EndpointConfig, apiKey, model, lang string, keywords []string, providerName string)`
+- Removed hardcoded base URL, now uses `endpoint.BaseURL + "/v1"` when endpoint provided
+- Added `NewOpenAIAdapterFromConfig(config Config)` for backward compatibility during migration
+- Language code converted to provider format via `language.ToProviderFormat(lang, providerName)`
+- Log messages now include provider name for better debugging
+- Added tests: `TestOpenAIAdapter_Creation`, `TestOpenAIAdapterFromConfig`
+- Updated factory to use `NewOpenAIAdapterFromConfig` for now (will be updated in Task 15)
+- All tests passing, typecheck passes

tasks/prd.jsonc

@@ -313,7 +313,7 @@
 				"Transcribe() works with Groq endpoint (different BaseURL)",
 				"Typecheck passes"
 			],
-			"passes": false
+			"passes": true
 		},
 		{
 			"title": "Remove redundant Groq and Mistral transcription adapters",