Move engine package under subsonic, as it should only be used by the Subsonic API.master

The idea is to move reusable code from `engine` to `core`, in future refactorings

server/subsonic/engine/list_generator.go

@@ -0,0 +1,186 @@
+package engine
+
+import (
+	"context"
+	"time"
+
+	"github.com/Masterminds/squirrel"
+	"github.com/deluan/navidrome/model"
+)
+
+type ListGenerator interface {
+	GetAllStarred(ctx context.Context) (artists Entries, albums Entries, mediaFiles Entries, err error)
+	GetNowPlaying(ctx context.Context) (Entries, error)
+	GetSongs(ctx context.Context, offset, size int, filter ListFilter) (Entries, error)
+	GetAlbums(ctx context.Context, offset, size int, filter ListFilter) (Entries, error)
+}
+
+func NewListGenerator(ds model.DataStore, npRepo NowPlayingRepository) ListGenerator {
+	return &listGenerator{ds, npRepo}
+}
+
+type ListFilter model.QueryOptions
+
+func ByNewest() ListFilter {
+	return ListFilter{Sort: "createdAt", Order: "desc"}
+}
+
+func ByRecent() ListFilter {
+	return ListFilter{Sort: "playDate", Order: "desc", Filters: squirrel.Gt{"play_date": time.Time{}}}
+}
+
+func ByFrequent() ListFilter {
+	return ListFilter{Sort: "playCount", Order: "desc", Filters: squirrel.Gt{"play_count": 0}}
+}
+
+func ByRandom() ListFilter {
+	return ListFilter{Sort: "random()"}
+}
+
+func ByName() ListFilter {
+	return ListFilter{Sort: "name"}
+}
+
+func ByArtist() ListFilter {
+	return ListFilter{Sort: "artist"}
+}
+
+func ByStarred() ListFilter {
+	return ListFilter{Sort: "starred_at", Order: "desc", Filters: squirrel.Eq{"starred": true}}
+}
+
+func ByRating() ListFilter {
+	return ListFilter{Sort: "Rating", Order: "desc", Filters: squirrel.Gt{"rating": 0}}
+}
+
+func ByGenre(genre string) ListFilter {
+	return ListFilter{
+		Sort:    "genre asc, name asc",
+		Filters: squirrel.Eq{"genre": genre},
+	}
+}
+
+func ByYear(fromYear, toYear int) ListFilter {
+	return ListFilter{
+		Sort: "max_year, name",
+		Filters: squirrel.Or{
+			squirrel.And{
+				squirrel.GtOrEq{"min_year": fromYear},
+				squirrel.LtOrEq{"min_year": toYear},
+			},
+			squirrel.And{
+				squirrel.GtOrEq{"max_year": fromYear},
+				squirrel.LtOrEq{"max_year": toYear},
+			},
+		},
+	}
+}
+
+func SongsByGenre(genre string) ListFilter {
+	return ListFilter{
+		Sort:    "genre asc, title asc",
+		Filters: squirrel.Eq{"genre": genre},
+	}
+}
+
+func SongsByRandom(genre string, fromYear, toYear int) ListFilter {
+	options := ListFilter{
+		Sort: "random()",
+	}
+	ff := squirrel.And{}
+	if genre != "" {
+		ff = append(ff, squirrel.Eq{"genre": genre})
+	}
+	if fromYear != 0 {
+		ff = append(ff, squirrel.GtOrEq{"year": fromYear})
+	}
+	if toYear != 0 {
+		ff = append(ff, squirrel.LtOrEq{"year": toYear})
+	}
+	options.Filters = ff
+	return options
+}
+
+type listGenerator struct {
+	ds     model.DataStore
+	npRepo NowPlayingRepository
+}
+
+func (g *listGenerator) GetSongs(ctx context.Context, offset, size int, filter ListFilter) (Entries, error) {
+	qo := model.QueryOptions(filter)
+	qo.Offset = offset
+	qo.Max = size
+	mediaFiles, err := g.ds.MediaFile(ctx).GetAll(qo)
+	if err != nil {
+		return nil, err
+	}
+
+	return FromMediaFiles(mediaFiles), nil
+}
+
+func (g *listGenerator) GetAlbums(ctx context.Context, offset, size int, filter ListFilter) (Entries, error) {
+	qo := model.QueryOptions(filter)
+	qo.Offset = offset
+	qo.Max = size
+	albums, err := g.ds.Album(ctx).GetAll(qo)
+	if err != nil {
+		return nil, err
+	}
+
+	return FromAlbums(albums), nil
+}
+
+func (g *listGenerator) GetStarred(ctx context.Context, offset int, size int) (Entries, error) {
+	qo := model.QueryOptions{Offset: offset, Max: size, Sort: "starred_at", Order: "desc"}
+	albums, err := g.ds.Album(ctx).GetStarred(qo)
+	if err != nil {
+		return nil, err
+	}
+
+	return FromAlbums(albums), nil
+}
+
+func (g *listGenerator) GetAllStarred(ctx context.Context) (artists Entries, albums Entries, mediaFiles Entries, err error) {
+	options := model.QueryOptions{Sort: "starred_at", Order: "desc"}
+
+	ars, err := g.ds.Artist(ctx).GetStarred(options)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	als, err := g.ds.Album(ctx).GetStarred(options)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	mfs, err := g.ds.MediaFile(ctx).GetStarred(options)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	artists = FromArtists(ars)
+	albums = FromAlbums(als)
+	mediaFiles = FromMediaFiles(mfs)
+
+	return
+}
+
+func (g *listGenerator) GetNowPlaying(ctx context.Context) (Entries, error) {
+	npInfo, err := g.npRepo.GetAll()
+	if err != nil {
+		return nil, err
+	}
+	entries := make(Entries, len(npInfo))
+	for i, np := range npInfo {
+		mf, err := g.ds.MediaFile(ctx).Get(np.TrackID)
+		if err != nil {
+			return nil, err
+		}
+		entries[i] = FromMediaFile(mf)
+		entries[i].UserName = np.Username
+		entries[i].MinutesAgo = int(time.Since(np.Start).Minutes())
+		entries[i].PlayerId = np.PlayerId
+		entries[i].PlayerName = np.PlayerName
+	}
+	return entries, nil
+}