feat: watch playlists and download newly added tracks

internal/store/watched.go

@@ -0,0 +1,84 @@
+package store
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	bolt "go.etcd.io/bbolt"
+)
+
+type WatchedPlaylist struct {
+	ID      string        `json:"id"`
+	Quality string        `json:"quality"`
+	BPM     bool          `json:"bpm"`
+	Timeout time.Duration `json:"timeout"`
+}
+
+var watchedBucket = []byte("watched")
+
+func ListWatchedPlaylists() ([]*WatchedPlaylist, error) {
+	var playlists []*WatchedPlaylist
+	if err := db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket(watchedBucket)
+		if b == nil {
+			return nil
+		}
+
+		return b.ForEach(func(k, v []byte) error {
+			var p WatchedPlaylist
+			if err := json.Unmarshal(v, &p); err != nil {
+				return err
+			}
+			playlists = append(playlists, &p)
+
+			return nil
+		})
+	}); err != nil {
+		return nil, err
+	}
+
+	return playlists, nil
+}
+
+func (p *WatchedPlaylist) Save() error {
+	return db.Update(func(tx *bolt.Tx) error {
+		b, err := tx.CreateBucketIfNotExists(watchedBucket)
+		if err != nil {
+			return err
+		}
+
+		data, err := json.Marshal(p)
+		if err != nil {
+			return err
+		}
+
+		return b.Put([]byte(p.ID), data)
+	})
+}
+
+func RemoveWatchedPlaylist(playlistID string) error {
+	return db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket(watchedBucket)
+		if b == nil {
+			return fmt.Errorf("bucket not found")
+		}
+
+		return b.Delete([]byte(playlistID))
+	})
+}
+
+func IsWatched(playlistID string) (bool, error) {
+	var found bool
+	err := db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket(watchedBucket)
+		if b == nil {
+			return nil
+		}
+		found = b.Get([]byte(playlistID)) != nil
+
+		return nil
+	})
+
+	return found, err
+}