package services
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import (
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"context"
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"fmt"
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"sync"
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"voicesnap/internal/config"
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"voicesnap/internal/engine"
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"voicesnap/internal/language"
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"voicesnap/internal/model"
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"voicesnap/internal/modelselection"
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"voicesnap/internal/paths"
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"github.com/wailsapp/wails/v3/pkg/application"
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)
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// EngineService provides engine status and model management to the frontend.
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type EngineService struct {
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cfg *config.Config
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app *application.App
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initCallback func()
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mu sync.RWMutex
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status string
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hardwareInfo string
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lastError string
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downloadMu sync.Mutex
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downloadID string
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downloadCancel context.CancelFunc
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downloadCancelling bool
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downloadProgress float64
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downloadDownloaded int64
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downloadTotal int64
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}
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func NewEngineService(cfg *config.Config) *EngineService {
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if cfg == nil {
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cfg = config.Default()
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}
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return &EngineService{cfg: cfg, status: "loading"}
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}
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// ModelExists returns true if the ASR model files are present.
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func (s *EngineService) ModelExists() bool {
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return engine.ModelExists()
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}
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func (s *EngineService) HasAnyInstalledModel() bool {
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return model.HasAnyUsableModel()
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}
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func (s *EngineService) GetStatus() map[string]interface{} {
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s.mu.RLock()
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defer s.mu.RUnlock()
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return map[string]interface{}{
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"status": s.status,
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"hardwareInfo": s.hardwareInfo,
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"error": s.lastError,
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}
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}
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func (s *EngineService) GetCurrentModelStatus() map[string]interface{} {
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current := s.currentModel()
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return s.modelStatusMap(current.Profile, current)
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}
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func (s *EngineService) ListModelOptions() []map[string]interface{} {
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current := s.currentModel()
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return s.listModelOptionsForCurrent(current)
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}
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func (s *EngineService) ListModelOptionsForLanguage(languageID string) []map[string]interface{} {
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current := s.currentModel()
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activeLanguageID := current.LanguageSettings.EffectiveLanguageID
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current.LanguageSettings = language.Resolve(config.LanguageModeManual, model.NormalizeLanguageID(languageID), nil)
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if current.LanguageSettings.EffectiveLanguageID != activeLanguageID {
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current.ModelID = ""
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}
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return s.listModelOptionsForCurrent(current)
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}
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func (s *EngineService) listModelOptionsForCurrent(current modelselection.CurrentModel) []map[string]interface{} {
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languageProfile, err := model.GetLanguageProfile(current.LanguageSettings.EffectiveLanguageID)
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if err != nil {
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return nil
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}
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ids := make([]string, 0, 1+len(languageProfile.UpgradeModelIDs))
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ids = append(ids, languageProfile.DefaultModelID)
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ids = append(ids, languageProfile.UpgradeModelIDs...)
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options := make([]map[string]interface{}, 0, len(ids))
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for _, id := range ids {
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profile, err := model.GetModelProfile(id)
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if err != nil {
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continue
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}
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options = append(options, s.modelStatusMap(profile, current))
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}
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return options
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}
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func (s *EngineService) SelectModel(modelID string) error {
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profile, err := s.allowedModelProfile(modelID)
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if err != nil {
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return err
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}
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resolved, err := model.ResolveModel(profile.ID)
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if err != nil {
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return err
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}
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if !resolved.IsUsable() {
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return fmt.Errorf("model %s is not installed", profile.ID)
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}
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s.cfg.ModelSelectionMode = config.ModelSelectionModeManual
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s.cfg.SelectedModelID = profile.ID
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config.Save(s.cfg)
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s.ReloadCurrentModel()
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return nil
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}
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func (s *EngineService) SelectModelForLanguage(languageID, modelID string) error {
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languageID = model.NormalizeLanguageID(languageID)
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profile, languageProfile, err := s.allowedModelProfileForLanguage(languageID, modelID)
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if err != nil {
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return err
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}
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resolved, err := model.ResolveModel(profile.ID)
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if err != nil {
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return err
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}
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if !resolved.IsUsable() {
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return fmt.Errorf("model %s is not installed", profile.ID)
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}
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s.persistLanguageModelSelection(languageID, profile, languageProfile)
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s.ReloadCurrentModel()
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return nil
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}
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func (s *EngineService) DownloadModelByID(modelID string) error {
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profile, err := s.allowedModelProfile(modelID)
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if err != nil {
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return err
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}
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if len(profile.DownloadURLs) == 0 {
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return fmt.Errorf("no download URL configured for model %s", profile.ID)
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}
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ctx, finish, err := s.beginModelDownload(profile.ID)
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if err != nil {
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return err
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}
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defer finish()
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err = model.DownloadProfileWithContext(ctx, profile, profile.DownloadURLs, paths.ModelsRoot(), func(percent float64, downloaded, total int64) {
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s.updateModelDownloadProgress(profile.ID, percent, downloaded, total)
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if s.app != nil {
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s.app.Event.Emit("model:download-progress", map[string]interface{}{
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"percent": percent,
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"downloaded": downloaded,
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"total": total,
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"modelID": profile.ID,
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"modelName": profile.DisplayName,
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})
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}
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})
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if err != nil {
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return err
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}
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s.cfg.ModelSelectionMode = config.ModelSelectionModeManual
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s.cfg.SelectedModelID = profile.ID
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config.Save(s.cfg)
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s.ReloadCurrentModel()
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return nil
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}
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func (s *EngineService) DownloadModelByIDForLanguage(languageID, modelID string) error {
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languageID = model.NormalizeLanguageID(languageID)
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profile, languageProfile, err := s.allowedModelProfileForLanguage(languageID, modelID)
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if err != nil {
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return err
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}
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if len(profile.DownloadURLs) == 0 {
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return fmt.Errorf("no download URL configured for model %s", profile.ID)
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}
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ctx, finish, err := s.beginModelDownload(profile.ID)
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if err != nil {
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return err
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}
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defer finish()
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err = model.DownloadProfileWithContext(ctx, profile, profile.DownloadURLs, paths.ModelsRoot(), func(percent float64, downloaded, total int64) {
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s.updateModelDownloadProgress(profile.ID, percent, downloaded, total)
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if s.app != nil {
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s.app.Event.Emit("model:download-progress", map[string]interface{}{
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"percent": percent,
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"downloaded": downloaded,
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"total": total,
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"modelID": profile.ID,
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"modelName": profile.DisplayName,
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})
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}
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})
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if err != nil {
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return err
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}
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s.persistLanguageModelSelection(languageID, profile, languageProfile)
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s.ReloadCurrentModel()
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return nil
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}
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func (s *EngineService) persistLanguageModelSelection(languageID string, profile model.ModelProfile, languageProfile model.LanguageProfile) {
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s.cfg.LanguageMode = config.LanguageModeManual
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s.cfg.LanguageID = languageID
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if profile.ID == languageProfile.DefaultModelID {
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s.cfg.ModelSelectionMode = config.ModelSelectionModeAuto
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s.cfg.SelectedModelID = ""
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} else {
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s.cfg.ModelSelectionMode = config.ModelSelectionModeManual
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s.cfg.SelectedModelID = profile.ID
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}
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config.Save(s.cfg)
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}
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func (s *EngineService) CancelModelDownload(modelID string) bool {
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s.downloadMu.Lock()
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activeID := s.downloadID
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if s.downloadCancel == nil || (modelID != "" && activeID != modelID) {
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s.downloadMu.Unlock()
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return false
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}
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s.downloadCancelling = true
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s.downloadCancel()
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s.downloadMu.Unlock()
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if s.app != nil {
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s.app.Event.Emit("model:download-cancelled", map[string]interface{}{
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"modelID": activeID,
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})
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}
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return true
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}
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func (s *EngineService) GetModelDownloadStatus() map[string]interface{} {
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s.downloadMu.Lock()
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defer s.downloadMu.Unlock()
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return s.modelDownloadStatusLocked()
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}
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func (s *EngineService) modelStatusMap(profile model.ModelProfile, current modelselection.CurrentModel) map[string]interface{} {
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resolved, err := model.ResolveModel(profile.ID)
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installed := err == nil && resolved.IsUsable()
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supportedInBuild := model.IsModelSupportedInCurrentBuild(profile.ID)
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status := model.ModelNotInstalled
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var missing []string
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var problems []string
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if err == nil {
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status = resolved.Status
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missing = resolved.Missing
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problems = resolved.Problems
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}
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return map[string]interface{}{
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"modelID": profile.ID,
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"displayName": profile.DisplayName,
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"backendKind": profile.BackendKind,
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"tier": profile.Tier,
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"languageID": current.LanguageSettings.EffectiveLanguageID,
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"selectionMode": current.SelectionMode,
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"isCurrent": profile.ID == current.ModelID,
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"isDefault": profile.ID == current.LanguageSettings.DefaultModelID,
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"installed": installed,
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"installStatus": status,
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"missing": missing,
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"problems": problems,
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"fallbackReason": current.FallbackReason,
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"downloadSize": profile.ApproxSize,
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"supportedLanguages": profile.SupportedLanguageIDs,
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"recommendedLanguage": profile.RecommendedFor,
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"description": profile.Description,
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"supportedInBuild": supportedInBuild,
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"unsupportedReason": model.ModelUnsupportedReason(profile.ID),
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}
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}
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func (s *EngineService) SetStatus(status, hardwareInfo, lastError string) {
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s.mu.Lock()
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s.status = status
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s.hardwareInfo = hardwareInfo
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s.lastError = lastError
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s.mu.Unlock()
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if s.app != nil {
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s.app.Event.Emit("engine:status", map[string]interface{}{
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"status": status,
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"hardwareInfo": hardwareInfo,
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"error": lastError,
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})
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}
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}
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// DownloadModel downloads the ASR model with progress events.
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func (s *EngineService) DownloadModel(primaryURL, fallbackURL string) error {
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profile := model.DefaultModelProfile()
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ctx, finish, err := s.beginModelDownload(profile.ID)
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if err != nil {
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return err
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}
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defer finish()
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err = model.DownloadProfileWithContext(ctx, profile, []string{primaryURL, fallbackURL}, paths.ModelsRoot(), func(percent float64, downloaded, total int64) {
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s.updateModelDownloadProgress(profile.ID, percent, downloaded, total)
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if s.app != nil {
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s.app.Event.Emit("model:download-progress", map[string]interface{}{
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"percent": percent,
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"downloaded": downloaded,
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"total": total,
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"modelID": profile.ID,
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"modelName": profile.DisplayName,
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})
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}
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})
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if err != nil {
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return err
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}
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if s.initCallback != nil {
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go s.initCallback()
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}
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return nil
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}
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func (s *EngineService) DownloadCurrentModel() error {
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current := s.currentModel()
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if len(current.Profile.DownloadURLs) == 0 {
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return fmt.Errorf("no download URL configured for model %s", current.ModelID)
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}
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ctx, finish, err := s.beginModelDownload(current.ModelID)
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if err != nil {
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return err
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}
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defer finish()
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err = model.DownloadProfileWithContext(ctx, current.Profile, current.Profile.DownloadURLs, paths.ModelsRoot(), func(percent float64, downloaded, total int64) {
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s.updateModelDownloadProgress(current.ModelID, percent, downloaded, total)
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if s.app != nil {
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s.app.Event.Emit("model:download-progress", map[string]interface{}{
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"percent": percent,
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"downloaded": downloaded,
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"total": total,
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"modelID": current.ModelID,
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"modelName": current.Profile.DisplayName,
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})
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}
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})
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if err != nil {
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return err
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}
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if s.initCallback != nil {
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go s.initCallback()
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}
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return nil
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}
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func (s *EngineService) ReloadCurrentModel() {
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if s.initCallback != nil {
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go s.initCallback()
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}
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}
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// SetInitCallback sets the callback to re-initialize the engine after model download.
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func (s *EngineService) SetInitCallback(cb func()) {
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s.initCallback = cb
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}
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// SetApp sets the Wails app reference for event emission.
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func (s *EngineService) SetApp(app *application.App) {
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s.app = app
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}
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func (s *EngineService) currentModel() modelselection.CurrentModel {
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if s.cfg == nil {
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cfg, err := config.Load()
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if err != nil {
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cfg = config.Default()
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}
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s.cfg = cfg
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}
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return modelselection.Resolve(s.cfg, language.NewSystemDetector())
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}
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func (s *EngineService) beginModelDownload(modelID string) (context.Context, func(), error) {
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s.downloadMu.Lock()
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defer s.downloadMu.Unlock()
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if s.downloadCancel != nil {
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return nil, nil, fmt.Errorf("model %s is already downloading", s.downloadID)
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}
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ctx, cancel := context.WithCancel(context.Background())
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s.downloadID = modelID
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s.downloadCancel = cancel
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s.downloadCancelling = false
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s.downloadProgress = 0
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s.downloadDownloaded = 0
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s.downloadTotal = 0
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finish := func() {
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emitFinished := false
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s.downloadMu.Lock()
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if s.downloadID == modelID {
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s.downloadID = ""
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s.downloadCancel = nil
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s.downloadCancelling = false
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s.downloadProgress = 0
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s.downloadDownloaded = 0
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s.downloadTotal = 0
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emitFinished = true
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}
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s.downloadMu.Unlock()
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if emitFinished && s.app != nil {
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s.app.Event.Emit("model:download-finished", map[string]interface{}{
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"modelID": modelID,
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})
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}
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}
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return ctx, finish, nil
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}
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func (s *EngineService) updateModelDownloadProgress(modelID string, percent float64, downloaded, total int64) {
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s.downloadMu.Lock()
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if s.downloadID == modelID && s.downloadCancel != nil {
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s.downloadProgress = percent
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s.downloadDownloaded = downloaded
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s.downloadTotal = total
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}
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s.downloadMu.Unlock()
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}
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func (s *EngineService) modelDownloadStatusLocked() map[string]interface{} {
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return map[string]interface{}{
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"active": s.downloadCancel != nil,
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"modelID": s.downloadID,
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"cancelling": s.downloadCancelling,
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"percent": s.downloadProgress,
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"downloaded": s.downloadDownloaded,
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"total": s.downloadTotal,
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}
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}
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func (s *EngineService) allowedModelProfile(modelID string) (model.ModelProfile, error) {
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current := s.currentModel()
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profile, _, err := s.allowedModelProfileForLanguage(current.LanguageSettings.EffectiveLanguageID, modelID)
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return profile, err
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}
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func (s *EngineService) allowedModelProfileForLanguage(languageID, modelID string) (model.ModelProfile, model.LanguageProfile, error) {
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profile, err := model.GetModelProfile(modelID)
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if err != nil {
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return model.ModelProfile{}, model.LanguageProfile{}, err
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}
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switch model.ModelUnsupportedReason(profile.ID) {
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case "":
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case model.UnsupportedReasonRequiresMacOS14:
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return model.ModelProfile{}, model.LanguageProfile{}, fmt.Errorf("model %s requires macOS 14 or later", profile.ID)
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case model.UnsupportedReasonWindowsPreview:
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return model.ModelProfile{}, model.LanguageProfile{}, fmt.Errorf("model %s is not supported in the Windows preview build; use SenseVoice", profile.ID)
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default:
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return model.ModelProfile{}, model.LanguageProfile{}, fmt.Errorf("model %s is not supported in this build", profile.ID)
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}
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languageProfile, err := model.GetLanguageProfile(model.NormalizeLanguageID(languageID))
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if err != nil {
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return model.ModelProfile{}, model.LanguageProfile{}, err
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}
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if profile.ID == languageProfile.DefaultModelID {
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return profile, languageProfile, nil
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}
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for _, id := range languageProfile.UpgradeModelIDs {
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if profile.ID == id {
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return profile, languageProfile, nil
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}
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}
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return model.ModelProfile{}, model.LanguageProfile{}, fmt.Errorf("model %s is not available for language %s", profile.ID, languageProfile.ID)
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}
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