feat: refactor

internal/transcriber/adapter_deepgram_batch.go

@@ -0,0 +1,126 @@
+package transcriber
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+
+	"github.com/leonardotrapani/hyprvoice/internal/language"
+	"github.com/leonardotrapani/hyprvoice/internal/provider"
+)
+
+// DeepgramBatchAdapter implements BatchAdapter for Deepgram pre-recorded transcription
+type DeepgramBatchAdapter struct {
+	endpoint *provider.EndpointConfig
+	apiKey   string
+	model    string
+	language string
+}
+
+// deepgramBatchResponse is the response from the pre-recorded API
+type deepgramBatchResponse struct {
+	Results *deepgramBatchResults `json:"results,omitempty"`
+	Error   *deepgramError        `json:"error,omitempty"`
+}
+
+type deepgramBatchResults struct {
+	Channels []deepgramBatchChannel `json:"channels,omitempty"`
+}
+
+type deepgramBatchChannel struct {
+	Alternatives []deepgramAlternative `json:"alternatives,omitempty"`
+}
+
+// NewDeepgramBatchAdapter creates a new batch adapter for Deepgram
+func NewDeepgramBatchAdapter(endpoint *provider.EndpointConfig, apiKey, model, lang string) *DeepgramBatchAdapter {
+	return &DeepgramBatchAdapter{
+		endpoint: endpoint,
+		apiKey:   apiKey,
+		model:    model,
+		language: lang,
+	}
+}
+
+// Transcribe sends audio data to Deepgram's pre-recorded API
+func (a *DeepgramBatchAdapter) Transcribe(ctx context.Context, audioData []byte) (string, error) {
+	// build URL with query parameters
+	apiURL, err := a.buildURL()
+	if err != nil {
+		return "", fmt.Errorf("build url: %w", err)
+	}
+
+	// create request with audio data as body
+	req, err := http.NewRequestWithContext(ctx, "POST", apiURL, bytes.NewReader(audioData))
+	if err != nil {
+		return "", fmt.Errorf("create request: %w", err)
+	}
+
+	// set headers
+	req.Header.Set("Authorization", "Token "+a.apiKey)
+	req.Header.Set("Content-Type", "audio/wav") // we send raw PCM wrapped as WAV
+
+	// send request
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("http request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	// read response
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("read response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("deepgram api error (status %d): %s", resp.StatusCode, string(body))
+	}
+
+	// parse response
+	var result deepgramBatchResponse
+	if err := json.Unmarshal(body, &result); err != nil {
+		return "", fmt.Errorf("parse response: %w", err)
+	}
+
+	if result.Error != nil {
+		return "", fmt.Errorf("deepgram error: %s", result.Error.Message)
+	}
+
+	// extract transcript
+	if result.Results == nil || len(result.Results.Channels) == 0 {
+		return "", nil
+	}
+	if len(result.Results.Channels[0].Alternatives) == 0 {
+		return "", nil
+	}
+
+	return result.Results.Channels[0].Alternatives[0].Transcript, nil
+}
+
+// buildURL constructs the API URL with query parameters
+func (a *DeepgramBatchAdapter) buildURL() (string, error) {
+	baseURL := a.endpoint.BaseURL + a.endpoint.Path
+
+	u, err := url.Parse(baseURL)
+	if err != nil {
+		return "", fmt.Errorf("parse base url: %w", err)
+	}
+
+	q := u.Query()
+	q.Set("model", a.model)
+	q.Set("smart_format", "true")
+	q.Set("punctuate", "true")
+
+	// add language if specified
+	providerLang := language.ToProviderFormat(a.language, "deepgram")
+	if providerLang != "" {
+		q.Set("language", providerLang)
+	}
+
+	u.RawQuery = q.Encode()
+	return u.String(), nil
+}