playlist model

internal/playback/playlist.go

@@ -0,0 +1,91 @@
+package playback
+
+import (
+	"errors"
+	"fmt"
+	"time"
+)
+
+var (
+	ErrPlaylistFeedUUIDRequired  = errors.New("playlist feed UUID is required when its domain is configured")
+	ErrPlaylistEntryEmpty        = errors.New("playlist entry must contain at least one feed")
+	ErrPlaylistSyncFeedsRequired = errors.New("synchronized playlist entry requires both video and audio feeds")
+	ErrPlaylistDurationNegative  = errors.New("playlist entry duration cannot be negative")
+)
+
+type PlaylistFeed struct {
+	Domain string
+	UUID   string
+}
+
+type PlaylistEntry struct {
+	Name          string
+	Video         PlaylistFeed
+	Audio         PlaylistFeed
+	SyncRequested bool
+	Duration      time.Duration
+}
+
+type Playlist struct {
+	Entries []PlaylistEntry
+	Loop    bool
+}
+
+func (f PlaylistFeed) IsConfigured() bool {
+	return f.UUID != ""
+}
+
+func (f PlaylistFeed) Validate() error {
+	if f.UUID != "" && f.Domain == "" {
+		return ErrFeedDomainRequired
+	}
+	if f.Domain != "" && f.UUID == "" {
+		return ErrPlaylistFeedUUIDRequired
+	}
+	return nil
+}
+
+func (e PlaylistEntry) Validate() error {
+	if err := e.Video.Validate(); err != nil {
+		return fmt.Errorf("video: %w", err)
+	}
+	if err := e.Audio.Validate(); err != nil {
+		return fmt.Errorf("audio: %w", err)
+	}
+	if !e.Video.IsConfigured() && !e.Audio.IsConfigured() {
+		return ErrPlaylistEntryEmpty
+	}
+	if e.SyncRequested && (!e.Video.IsConfigured() || !e.Audio.IsConfigured()) {
+		return ErrPlaylistSyncFeedsRequired
+	}
+	if e.Duration < 0 {
+		return ErrPlaylistDurationNegative
+	}
+	return nil
+}
+
+func (p Playlist) Validate() error {
+	for index, entry := range p.Entries {
+		if err := entry.Validate(); err != nil {
+			return fmt.Errorf("playlist entry %d: %w", index, err)
+		}
+	}
+	return nil
+}
+
+func (e PlaylistEntry) SessionConfig(retry RetryPolicy) SessionConfig {
+	return SessionConfig{
+		Video: FeedConfig{
+			Domain: e.Video.Domain,
+			UUID:   e.Video.UUID,
+			Active: e.Video.UUID != "",
+		},
+		Audio: FeedConfig{
+			Domain: e.Audio.Domain,
+			UUID:   e.Audio.UUID,
+			Active: e.Audio.UUID != "",
+		},
+		SyncRequested: e.SyncRequested,
+		Retry:         retry,
+	}
+}