Added tag filter for soundtracks

pages/soundtracks/tag.go

@@ -0,0 +1,72 @@
+package soundtracks
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/aerogo/aero"
+	"github.com/animenotifier/arn"
+	"github.com/animenotifier/notify.moe/components"
+	"github.com/animenotifier/notify.moe/utils"
+)
+
+// FilterByTag renders the soundtracks with the given tag.
+func FilterByTag(ctx *aero.Context) string {
+	user := utils.GetUser(ctx)
+	tag := ctx.Get("tag")
+
+	tracks := arn.FilterSoundTracks(func(track *arn.SoundTrack) bool {
+		return !track.IsDraft && len(track.Media) > 0 && track.HasTag(tag)
+	})
+
+	arn.SortSoundTracksPopularFirst(tracks)
+
+	// Limit the number of displayed tracks
+	loadMoreIndex := 0
+
+	if len(tracks) > maxTracks {
+		tracks = tracks[:maxTracks]
+		loadMoreIndex = maxTracks
+	}
+
+	return ctx.HTML(components.SoundTracks(tracks, loadMoreIndex, tag, user))
+}
+
+// FilterByTagFrom renders the soundtracks from the given index.
+func FilterByTagFrom(ctx *aero.Context) string {
+	user := utils.GetUser(ctx)
+	tag := ctx.Get("tag")
+	index, err := ctx.GetInt("index")
+
+	if err != nil {
+		return ctx.Error(http.StatusBadRequest, "Invalid start index", err)
+	}
+
+	allTracks := arn.FilterSoundTracks(func(track *arn.SoundTrack) bool {
+		return !track.IsDraft && len(track.Media) > 0 && track.HasTag(tag)
+	})
+
+	if index < 0 || index >= len(allTracks) {
+		return ctx.Error(http.StatusBadRequest, "Invalid start index (maximum is "+strconv.Itoa(len(allTracks))+")", nil)
+	}
+
+	arn.SortSoundTracksPopularFirst(allTracks)
+
+	tracks := allTracks[index:]
+
+	if len(tracks) > maxTracks {
+		tracks = tracks[:maxTracks]
+	}
+
+	nextIndex := index + maxTracks
+
+	if nextIndex >= len(allTracks) {
+		// End of data - no more scrolling
+		ctx.Response().Header().Set("X-LoadMore-Index", "-1")
+	} else {
+		// Send the index for the next request
+		ctx.Response().Header().Set("X-LoadMore-Index", strconv.Itoa(nextIndex))
+	}
+
+	return ctx.HTML(components.SoundTracksScrollable(tracks, user))
+}