feat(api): GET /api/tracks/{id} handler with parent metadata

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/api/library.go

@@ -0,0 +1,66 @@
+package api
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/jackc/pgx/v5"
+
+	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
+)
+
+// handleGetTrack implements GET /api/tracks/{id}. Resolves parent album +
+// artist names so the response is self-contained — clients should not need
+// a follow-up request to render a track outside an album view.
+func (h *handlers) handleGetTrack(w http.ResponseWriter, r *http.Request) {
+	id, ok := parseUUID(chi.URLParam(r, "id"))
+	if !ok {
+		writeErr(w, http.StatusBadRequest, "bad_request", "invalid track id")
+		return
+	}
+	q := dbq.New(h.pool)
+	track, err := q.GetTrackByID(r.Context(), id)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			writeErr(w, http.StatusNotFound, "not_found", "track not found")
+			return
+		}
+		h.logger.Error("api: get track failed", "err", err)
+		writeErr(w, http.StatusInternalServerError, "server_error", "lookup failed")
+		return
+	}
+	album, err := q.GetAlbumByID(r.Context(), track.AlbumID)
+	if err != nil {
+		h.logger.Error("api: get track album failed", "err", err)
+		writeErr(w, http.StatusInternalServerError, "server_error", "lookup failed")
+		return
+	}
+	artist, err := q.GetArtistByID(r.Context(), track.ArtistID)
+	if err != nil {
+		h.logger.Error("api: get track artist failed", "err", err)
+		writeErr(w, http.StatusInternalServerError, "server_error", "lookup failed")
+		return
+	}
+	writeJSON(w, http.StatusOK, trackRefFrom(track, album.Title, artist.Name))
+}
+
+// handleGetAlbum is implemented in Task 7.
+func (h *handlers) handleGetAlbum(w http.ResponseWriter, r *http.Request) {
+	writeErr(w, http.StatusNotImplemented, "not_implemented", "stub")
+}
+
+// handleGetArtist is implemented in Task 8.
+func (h *handlers) handleGetArtist(w http.ResponseWriter, r *http.Request) {
+	writeErr(w, http.StatusNotImplemented, "not_implemented", "stub")
+}
+
+// handleListArtists is implemented in Task 9.
+func (h *handlers) handleListArtists(w http.ResponseWriter, r *http.Request) {
+	writeErr(w, http.StatusNotImplemented, "not_implemented", "stub")
+}
+
+// handleSearch is implemented in Task 10 (file: search.go).
+func (h *handlers) handleSearch(w http.ResponseWriter, r *http.Request) {
+	writeErr(w, http.StatusNotImplemented, "not_implemented", "stub")
+}