refactor: major project restructure

internal/store/download_info.go

@@ -0,0 +1,59 @@
+package store
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"go.etcd.io/bbolt"
+)
+
+type DownloadInfo struct {
+	SongID     string    `json:"song_id"`
+	Quality    string    `json:"quality"`
+	Path       string    `json:"path"`
+	Hash       string    `json:"hash"`
+	Downloaded time.Time `json:"downloaded_at"`
+}
+
+func GetDownloadInfo(songID string) (*DownloadInfo, error) {
+	var info DownloadInfo
+
+	if err := db.View(func(tx *bbolt.Tx) error {
+		b := tx.Bucket(trackBucket)
+		if b == nil {
+			return fmt.Errorf("bucket not found")
+		}
+
+		data := b.Get([]byte(songID))
+		if data == nil {
+			return fmt.Errorf("not found")
+		}
+		return json.Unmarshal(data, &info)
+	}); err != nil {
+		return nil, err
+	}
+
+	return &info, nil
+}
+
+func (d *DownloadInfo) Save() error {
+	return db.Update(func(tx *bbolt.Tx) error {
+		b := tx.Bucket(trackBucket)
+		if b == nil {
+			return fmt.Errorf("bucket not found")
+		}
+
+		data, err := json.Marshal(d)
+		if err != nil {
+			return err
+		}
+
+		err = b.Put([]byte(d.SongID), data)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	})
+}

internal/store/store.go

@@ -0,0 +1,32 @@
+package store
+
+import (
+	"fmt"
+	"path"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+var (
+	db          *bolt.DB
+	trackBucket = []byte("tracks")
+)
+
+func OpenDB(cfgDir string) error {
+	var err error
+
+	dbPath := path.Join(cfgDir, "tracks.db")
+	db, err = bolt.Open(dbPath, 0600, nil)
+	if err != nil {
+		return fmt.Errorf("failed to open database: %w", err)
+	}
+
+	if err := db.Update(func(tx *bolt.Tx) error {
+		_, err := tx.CreateBucketIfNotExists(trackBucket)
+		return err
+	}); err != nil {
+		return fmt.Errorf("failed to create bucket: %w", err)
+	}
+
+	return nil
+}