Initial commit

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

backend/internal/handler/stats.go

@@ -0,0 +1,47 @@
+package handler
+
+import "net/http"
+
+func (h *Handler) handleGetLastLog(w http.ResponseWriter, r *http.Request) {
+	id, err := pathID(r, "id")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "Ungültige ID")
+		return
+	}
+
+	lastLog, err := h.store.GetLastLog(id)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "Fehler beim Laden des letzten Logs")
+		return
+	}
+	if lastLog == nil {
+		writeError(w, http.StatusNotFound, "Noch kein Log für diese Übung")
+		return
+	}
+	writeJSON(w, http.StatusOK, lastLog)
+}
+
+func (h *Handler) handleGetExerciseHistory(w http.ResponseWriter, r *http.Request) {
+	id, err := pathID(r, "id")
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "Ungültige ID")
+		return
+	}
+	limit := queryInt(r, "limit", 30)
+
+	logs, err := h.store.GetExerciseHistory(id, limit)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "Fehler beim Laden der Übungshistorie")
+		return
+	}
+	writeJSON(w, http.StatusOK, logs)
+}
+
+func (h *Handler) handleGetStatsOverview(w http.ResponseWriter, r *http.Request) {
+	overview, err := h.store.GetStatsOverview()
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "Fehler beim Laden der Statistiken")
+		return
+	}
+	writeJSON(w, http.StatusOK, overview)
+}