refactor: open track store explicitly and remove global state

internal/config/config.go

@@ -6,7 +6,6 @@ import (
 	"path/filepath"
 
 	"github.com/mathismqn/godeez/internal/fileutil"
-	"github.com/mathismqn/godeez/internal/store"
 )
 
 type Config struct {
@@ -14,7 +13,7 @@ type Config struct {
 	OutputDir string
 }
 
-func New() (*Config, error) {
+func Load() (*Config, error) {
 	arl := os.Getenv("DEEZER_ARL")
 
 	homeDir, err := os.UserHomeDir()
@@ -27,24 +26,6 @@ func New() (*Config, error) {
 		return nil, fmt.Errorf("failed to create output directory: %w", err)
 	}
 
-	// Migrate tracks.db from ~/.godeez/ to output dir
-	oldDB := filepath.Join(homeDir, ".godeez", "tracks.db")
-	newDB := filepath.Join(outputDir, ".tracks.db")
-	if _, err := os.Stat(oldDB); err == nil {
-		if _, err := os.Stat(newDB); os.IsNotExist(err) {
-			os.Rename(oldDB, newDB)
-		}
-	}
-
-	// Clean up old config directory
-	oldDir := filepath.Join(homeDir, ".godeez")
-	os.Remove(filepath.Join(oldDir, "config.toml"))
-	os.Remove(oldDir) // fails silently if not empty
-
-	if err := store.OpenDB(outputDir); err != nil {
-		return nil, err
-	}
-
 	return &Config{
 		ARLCookie: arl,
 		OutputDir: outputDir,

internal/config/migrate.go

@@ -0,0 +1,25 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func MigrateLegacy(outputDir string) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return
+	}
+
+	oldDB := filepath.Join(homeDir, ".godeez", "tracks.db")
+	newDB := filepath.Join(outputDir, ".tracks.db")
+	if _, err := os.Stat(oldDB); err == nil {
+		if _, err := os.Stat(newDB); os.IsNotExist(err) {
+			os.Rename(oldDB, newDB)
+		}
+	}
+
+	oldDir := filepath.Join(homeDir, ".godeez")
+	os.Remove(filepath.Join(oldDir, "config.toml"))
+	os.Remove(oldDir)
+}

internal/downloader/client.go

@@ -23,6 +23,7 @@ const chunkSize = 2048
 
 type Client struct {
 	appConfig    *config.Config
+	store        *store.Store
 	kind         deezer.Kind
 	deezerClient *deezer.Client
 
@@ -31,9 +32,10 @@ type Client struct {
 	hashIndexErr  error
 }
 
-func New(appConfig *config.Config, kind deezer.Kind) *Client {
+func New(appConfig *config.Config, st *store.Store, kind deezer.Kind) *Client {
 	return &Client{
 		appConfig: appConfig,
+		store:     st,
 		kind:      kind,
 	}
 }
@@ -249,7 +251,7 @@ func (c *Client) finalizeDownload(resource deezer.Resource, track *deezer.Track,
 		Downloaded: time.Now(),
 	}
 
-	if err := info.Save(); err != nil {
+	if err := c.store.PutDownloadInfo(info); err != nil {
 		warnings = append(warnings, fmt.Sprintf("failed to save download info: %v", err))
 	}
 

internal/downloader/skip.go

@@ -4,11 +4,10 @@ import (
 	"context"
 
 	"github.com/mathismqn/godeez/internal/fileutil"
-	"github.com/mathismqn/godeez/internal/store"
 )
 
 func (c *Client) shouldSkipDownload(ctx context.Context, trackID, mediaFormat string) (string, bool) {
-	existing, err := store.GetDownloadInfo(trackID)
+	existing, err := c.store.DownloadInfo(trackID)
 	if err != nil || existing.Quality != mediaFormat {
 		return "", false
 	}
@@ -31,7 +30,7 @@ func (c *Client) shouldSkipDownload(ctx context.Context, trackID, mediaFormat st
 	}
 
 	existing.Path = foundPath
-	_ = existing.Save()
+	_ = c.store.PutDownloadInfo(existing)
 
 	return foundPath, true
 }

internal/store/download_info.go

@@ -18,10 +18,10 @@ type DownloadInfo struct {
 
 var trackBucket = []byte("tracks")
 
-func GetDownloadInfo(trackID string) (*DownloadInfo, error) {
+func (s *Store) DownloadInfo(trackID string) (*DownloadInfo, error) {
 	var info DownloadInfo
 
-	if err := db.View(func(tx *bbolt.Tx) error {
+	if err := s.db.View(func(tx *bbolt.Tx) error {
 		b := tx.Bucket(trackBucket)
 		if b == nil {
 			return fmt.Errorf("bucket not found")
@@ -39,8 +39,8 @@ func GetDownloadInfo(trackID string) (*DownloadInfo, error) {
 	return &info, nil
 }
 
-func (d *DownloadInfo) Save() error {
-	return db.Update(func(tx *bbolt.Tx) error {
+func (s *Store) PutDownloadInfo(d *DownloadInfo) error {
+	return s.db.Update(func(tx *bbolt.Tx) error {
 		b, err := tx.CreateBucketIfNotExists(trackBucket)
 		if err != nil {
 			return fmt.Errorf("failed to create bucket: %w", err)

internal/store/store.go

@@ -7,13 +7,19 @@ import (
 	bolt "go.etcd.io/bbolt"
 )
 
-var db *bolt.DB
+type Store struct {
+	db *bolt.DB
+}
 
-func OpenDB(cfgDir string) error {
-	var err error
-	db, err = bolt.Open(path.Join(cfgDir, ".tracks.db"), 0600, nil)
+func Open(dir string) (*Store, error) {
+	db, err := bolt.Open(path.Join(dir, ".tracks.db"), 0600, nil)
 	if err != nil {
-		return fmt.Errorf("failed to open database: %w", err)
+		return nil, fmt.Errorf("failed to open database: %w", err)
 	}
-	return nil
+
+	return &Store{db: db}, nil
+}
+
+func (s *Store) Close() error {
+	return s.db.Close()
 }