feat: interest over time graph (#127)

* api

* ui

* test

* add margin to prevent clipping

engine/handlers/interest.go

@@ -0,0 +1,47 @@
+package handlers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gabehf/koito/internal/db"
+	"github.com/gabehf/koito/internal/logger"
+	"github.com/gabehf/koito/internal/utils"
+)
+
+func GetInterestHandler(store db.DB) func(w http.ResponseWriter, r *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		l := logger.FromContext(ctx)
+
+		l.Debug().Msg("GetInterestHandler: Received request to retrieve interest")
+
+		// im just using this to parse the artist/album/track id, which is bad
+		parsed := OptsFromRequest(r)
+
+		bucketCountStr := r.URL.Query().Get("buckets")
+		var buckets = 0
+		var err error
+		if buckets, err = strconv.Atoi(bucketCountStr); err != nil {
+			l.Debug().Msg("GetInterestHandler: Buckets is not an integer")
+			utils.WriteError(w, "parameter 'buckets' must be an integer", http.StatusBadRequest)
+			return
+		}
+
+		opts := db.GetInterestOpts{
+			Buckets:  buckets,
+			AlbumID:  int32(parsed.AlbumID),
+			ArtistID: int32(parsed.ArtistID),
+			TrackID:  int32(parsed.TrackID),
+		}
+
+		interest, err := store.GetInterest(ctx, opts)
+		if err != nil {
+			l.Err(err).Msg("GetInterestHandler: Failed to query interest")
+			utils.WriteError(w, "Failed to retrieve interest: "+err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		utils.WriteJSON(w, http.StatusOK, interest)
+	}
+}

engine/routes.go

@@ -55,6 +55,7 @@ func bindRoutes(
 			r.Get("/search", handlers.SearchHandler(db))
 			r.Get("/aliases", handlers.GetAliasesHandler(db))
 			r.Get("/summary", handlers.SummaryHandler(db))
+			r.Get("/interest", handlers.GetInterestHandler(db))
 		})
 		r.Post("/logout", handlers.LogoutHandler(db))
 		if !cfg.RateLimitDisabled() {