Initial commit

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

backend/internal/handler/handler.go

@@ -0,0 +1,83 @@
+package handler
+
+import (
+	"encoding/json"
+	"krafttrainer/internal/store"
+	"net/http"
+	"strconv"
+)
+
+// Handler bündelt alle HTTP-Handler und hält eine Referenz auf den Store.
+type Handler struct {
+	store *store.Store
+}
+
+// New erstellt einen neuen Handler.
+func New(store *store.Store) *Handler {
+	return &Handler{store: store}
+}
+
+// RegisterRoutes registriert alle API-Routen am ServeMux.
+func (h *Handler) RegisterRoutes(mux *http.ServeMux) {
+	// Exercises
+	mux.HandleFunc("GET /api/v1/exercises", h.handleListExercises)
+	mux.HandleFunc("POST /api/v1/exercises", h.handleCreateExercise)
+	mux.HandleFunc("PUT /api/v1/exercises/{id}", h.handleUpdateExercise)
+	mux.HandleFunc("DELETE /api/v1/exercises/{id}", h.handleDeleteExercise)
+
+	// Training Sets
+	mux.HandleFunc("GET /api/v1/sets", h.handleListSets)
+	mux.HandleFunc("POST /api/v1/sets", h.handleCreateSet)
+	mux.HandleFunc("PUT /api/v1/sets/{id}", h.handleUpdateSet)
+	mux.HandleFunc("DELETE /api/v1/sets/{id}", h.handleDeleteSet)
+
+	// Sessions
+	mux.HandleFunc("POST /api/v1/sessions", h.handleCreateSession)
+	mux.HandleFunc("GET /api/v1/sessions", h.handleListSessions)
+	mux.HandleFunc("GET /api/v1/sessions/{id}", h.handleGetSession)
+	mux.HandleFunc("PUT /api/v1/sessions/{id}/end", h.handleEndSession)
+
+	// Session Logs
+	mux.HandleFunc("POST /api/v1/sessions/{id}/logs", h.handleCreateLog)
+	mux.HandleFunc("PUT /api/v1/sessions/{id}/logs/{logId}", h.handleUpdateLog)
+	mux.HandleFunc("DELETE /api/v1/sessions/{id}/logs/{logId}", h.handleDeleteLog)
+
+	// Stats
+	mux.HandleFunc("GET /api/v1/exercises/{id}/last-log", h.handleGetLastLog)
+	mux.HandleFunc("GET /api/v1/exercises/{id}/history", h.handleGetExerciseHistory)
+	mux.HandleFunc("GET /api/v1/stats/overview", h.handleGetStatsOverview)
+}
+
+// --- Hilfsfunktionen ---
+
+func writeJSON(w http.ResponseWriter, status int, data any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	json.NewEncoder(w).Encode(data)
+}
+
+func writeError(w http.ResponseWriter, status int, message string) {
+	writeJSON(w, status, map[string]string{"error": message})
+}
+
+func decodeJSON(r *http.Request, dst any) error {
+	dec := json.NewDecoder(r.Body)
+	dec.DisallowUnknownFields()
+	return dec.Decode(dst)
+}
+
+func pathID(r *http.Request, name string) (int64, error) {
+	return strconv.ParseInt(r.PathValue(name), 10, 64)
+}
+
+func queryInt(r *http.Request, name string, defaultVal int) int {
+	v := r.URL.Query().Get(name)
+	if v == "" {
+		return defaultVal
+	}
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return defaultVal
+	}
+	return n
+}