[hw-3] loms service

cart/internal/app/server/checkout_handler.go

@@ -0,0 +1,58 @@
+package server
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"route256/cart/internal/domain/entity"
+	"route256/cart/internal/domain/model"
+
+	"github.com/rs/zerolog/log"
+)
+
+type CheckoutResponse struct {
+	OrderID int64 `json:"order_id"`
+}
+
+func (s *Server) CheckoutHandler(w http.ResponseWriter, r *http.Request) {
+	strUserID := r.PathValue("user_id")
+	userID, err := strconv.ParseInt(strUserID, 10, 64)
+	if err != nil || userID <= 0 {
+		if err == nil {
+			err = fmt.Errorf("user_id must be greater than 0")
+		}
+
+		makeErrorResponse(w, err, http.StatusBadRequest)
+
+		log.Trace().Err(err).Msgf("user_id=`%s`", strUserID)
+
+		return
+	}
+
+	orderID, err := s.cartService.CheckoutUserCart(r.Context(), entity.UID(userID))
+	switch {
+	case errors.Is(err, model.ErrCartNotFound):
+		makeErrorResponse(w, err, http.StatusNotFound)
+
+		return
+	case err != nil:
+		makeErrorResponse(w, err, http.StatusInternalServerError)
+
+		return
+	}
+
+	resp := CheckoutResponse{
+		OrderID: orderID,
+	}
+
+	w.Header().Add("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	if err := json.NewEncoder(w).Encode(resp); err != nil {
+		makeErrorResponse(w, err, http.StatusInternalServerError)
+
+		return
+	}
+}