From 94992b563fdfddce683fc07ef5bb70e18ff910fe Mon Sep 17 00:00:00 2001
From: Ariver <shanghai3168@gmail.com>
Date: Wed, 03 Jun 2026 16:25:00 +0800
Subject: [PATCH] Record Round 4 candidate install verification

---
 privatevoice.src/services/engine_service.go |  189 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 187 insertions(+), 2 deletions(-)

diff --git a/privatevoice.src/services/engine_service.go b/privatevoice.src/services/engine_service.go
index 305353d..d40c951 100755
--- a/privatevoice.src/services/engine_service.go
+++ b/privatevoice.src/services/engine_service.go
@@ -1,9 +1,13 @@
 package services
 
 import (
+	"fmt"
 	"sync"
+	"voicesnap/internal/config"
 	"voicesnap/internal/engine"
+	"voicesnap/internal/language"
 	"voicesnap/internal/model"
+	"voicesnap/internal/modelselection"
 	"voicesnap/internal/paths"
 
 	"github.com/wailsapp/wails/v3/pkg/application"
@@ -11,6 +15,7 @@
 
 // EngineService provides engine status and model management to the frontend.
 type EngineService struct {
+	cfg          *config.Config
 	app          *application.App
 	initCallback func()
 	mu           sync.RWMutex
@@ -19,8 +24,11 @@
 	lastError    string
 }
 
-func NewEngineService() *EngineService {
-	return &EngineService{status: "loading"}
+func NewEngineService(cfg *config.Config) *EngineService {
+	if cfg == nil {
+		cfg = config.Default()
+	}
+	return &EngineService{cfg: cfg, status: "loading"}
 }
 
 // ModelExists returns true if the ASR model files are present.
@@ -35,6 +43,117 @@
 		"status":       s.status,
 		"hardwareInfo": s.hardwareInfo,
 		"error":        s.lastError,
+	}
+}
+
+func (s *EngineService) GetCurrentModelStatus() map[string]interface{} {
+	current := s.currentModel()
+	return s.modelStatusMap(current.Profile, current)
+}
+
+func (s *EngineService) ListModelOptions() []map[string]interface{} {
+	current := s.currentModel()
+	languageProfile, err := model.GetLanguageProfile(current.LanguageSettings.EffectiveLanguageID)
+	if err != nil {
+		return nil
+	}
+
+	ids := make([]string, 0, 1+len(languageProfile.UpgradeModelIDs))
+	ids = append(ids, languageProfile.DefaultModelID)
+	ids = append(ids, languageProfile.UpgradeModelIDs...)
+
+	options := make([]map[string]interface{}, 0, len(ids))
+	for _, id := range ids {
+		profile, err := model.GetModelProfile(id)
+		if err != nil {
+			continue
+		}
+		options = append(options, s.modelStatusMap(profile, current))
+	}
+	return options
+}
+
+func (s *EngineService) SelectModel(modelID string) error {
+	profile, err := s.allowedModelProfile(modelID)
+	if err != nil {
+		return err
+	}
+	resolved, err := model.ResolveModel(profile.ID)
+	if err != nil {
+		return err
+	}
+	if !resolved.IsUsable() {
+		return fmt.Errorf("model %s is not installed", profile.ID)
+	}
+
+	s.cfg.ModelSelectionMode = config.ModelSelectionModeManual
+	s.cfg.SelectedModelID = profile.ID
+	config.Save(s.cfg)
+	s.ReloadCurrentModel()
+	return nil
+}
+
+func (s *EngineService) DownloadModelByID(modelID string) error {
+	profile, err := s.allowedModelProfile(modelID)
+	if err != nil {
+		return err
+	}
+	if len(profile.DownloadURLs) == 0 {
+		return fmt.Errorf("no download URL configured for model %s", profile.ID)
+	}
+
+	err = model.DownloadProfile(profile, profile.DownloadURLs, paths.ModelsRoot(), func(percent float64, downloaded, total int64) {
+		if s.app != nil {
+			s.app.Event.Emit("model:download-progress", map[string]interface{}{
+				"percent":    percent,
+				"downloaded": downloaded,
+				"total":      total,
+				"modelID":    profile.ID,
+				"modelName":  profile.DisplayName,
+			})
+		}
+	})
+	if err != nil {
+		return err
+	}
+
+	s.cfg.ModelSelectionMode = config.ModelSelectionModeManual
+	s.cfg.SelectedModelID = profile.ID
+	config.Save(s.cfg)
+	s.ReloadCurrentModel()
+	return nil
+}
+
+func (s *EngineService) modelStatusMap(profile model.ModelProfile, current modelselection.CurrentModel) map[string]interface{} {
+	resolved, err := model.ResolveModel(profile.ID)
+	installed := err == nil && resolved.IsUsable()
+	status := model.ModelNotInstalled
+	var missing []string
+	var problems []string
+	if err == nil {
+		status = resolved.Status
+		missing = resolved.Missing
+		problems = resolved.Problems
+	}
+
+	return map[string]interface{}{
+		"modelID":             profile.ID,
+		"displayName":         profile.DisplayName,
+		"backendKind":         profile.BackendKind,
+		"tier":                profile.Tier,
+		"languageID":          current.LanguageSettings.EffectiveLanguageID,
+		"selectionMode":       current.SelectionMode,
+		"isCurrent":           profile.ID == current.ModelID,
+		"isDefault":           profile.ID == current.LanguageSettings.DefaultModelID,
+		"installed":           installed,
+		"installStatus":       status,
+		"missing":             missing,
+		"problems":            problems,
+		"fallbackReason":      current.FallbackReason,
+		"downloadSize":        profile.ApproxSize,
+		"supportedLanguages":  profile.SupportedLanguageIDs,
+		"recommendedLanguage": profile.RecommendedFor,
+		"description":         profile.Description,
 	}
 }
 
@@ -67,6 +186,39 @@
 	return nil
 }
 
+func (s *EngineService) DownloadCurrentModel() error {
+	current := s.currentModel()
+	if len(current.Profile.DownloadURLs) == 0 {
+		return fmt.Errorf("no download URL configured for model %s", current.ModelID)
+	}
+
+	err := model.DownloadProfile(current.Profile, current.Profile.DownloadURLs, paths.ModelsRoot(), func(percent float64, downloaded, total int64) {
+		if s.app != nil {
+			s.app.Event.Emit("model:download-progress", map[string]interface{}{
+				"percent":    percent,
+				"downloaded": downloaded,
+				"total":      total,
+				"modelID":    current.ModelID,
+				"modelName":  current.Profile.DisplayName,
+			})
+		}
+	})
+	if err != nil {
+		return err
+	}
+
+	if s.initCallback != nil {
+		go s.initCallback()
+	}
+	return nil
+}
+
+func (s *EngineService) ReloadCurrentModel() {
+	if s.initCallback != nil {
+		go s.initCallback()
+	}
+}
+
 // SetInitCallback sets the callback to re-initialize the engine after model download.
 func (s *EngineService) SetInitCallback(cb func()) {
 	s.initCallback = cb
@@ -76,3 +228,36 @@
 func (s *EngineService) SetApp(app *application.App) {
 	s.app = app
 }
+
+func (s *EngineService) currentModel() modelselection.CurrentModel {
+	if s.cfg == nil {
+		cfg, err := config.Load()
+		if err != nil {
+			cfg = config.Default()
+		}
+		s.cfg = cfg
+	}
+	return modelselection.Resolve(s.cfg, language.NewSystemDetector())
+}
+
+func (s *EngineService) allowedModelProfile(modelID string) (model.ModelProfile, error) {
+	profile, err := model.GetModelProfile(modelID)
+	if err != nil {
+		return model.ModelProfile{}, err
+	}
+
+	current := s.currentModel()
+	languageProfile, err := model.GetLanguageProfile(current.LanguageSettings.EffectiveLanguageID)
+	if err != nil {
+		return model.ModelProfile{}, err
+	}
+	if profile.ID == languageProfile.DefaultModelID {
+		return profile, nil
+	}
+	for _, id := range languageProfile.UpgradeModelIDs {
+		if profile.ID == id {
+			return profile, nil
+		}
+	}
+	return model.ModelProfile{}, fmt.Errorf("model %s is not available for language %s", profile.ID, current.LanguageSettings.EffectiveLanguageID)
+}

--
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