first

backend/internal/modules/units/handler.go

@@ -0,0 +1,109 @@
+package units
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+)
+
+type Handler struct {
+	service *Service
+}
+
+func NewHandler(service *Service) *Handler {
+	return &Handler{service: service}
+}
+
+type unitResponse struct {
+	ID     uuid.UUID `json:"id"`
+	Name   string    `json:"name"`
+	Symbol string    `json:"symbol"`
+}
+
+func toResponse(u *Unit) unitResponse {
+	return unitResponse{ID: u.ID, Name: u.Name, Symbol: u.Symbol}
+}
+
+func (h *Handler) List(c *gin.Context) {
+	list, err := h.service.List(c.Request.Context())
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to list units"})
+		return
+	}
+	resp := make([]unitResponse, 0, len(list))
+	for _, u := range list {
+		resp = append(resp, toResponse(u))
+	}
+	c.JSON(http.StatusOK, gin.H{"units": resp})
+}
+
+type upsertRequest struct {
+	Name   string `json:"name" binding:"required"`
+	Symbol string `json:"symbol" binding:"required"`
+}
+
+func (h *Handler) Create(c *gin.Context) {
+	var req upsertRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "validation error", "details": err.Error()})
+		return
+	}
+	u, err := h.service.Create(c.Request.Context(), req.Name, req.Symbol)
+	if err != nil {
+		if errors.Is(err, ErrSymbolTaken) {
+			c.JSON(http.StatusConflict, gin.H{"error": "symbol already in use"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create unit"})
+		return
+	}
+	c.JSON(http.StatusCreated, toResponse(u))
+}
+
+func (h *Handler) Update(c *gin.Context) {
+	id, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
+		return
+	}
+	var req upsertRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "validation error", "details": err.Error()})
+		return
+	}
+	u, err := h.service.Update(c.Request.Context(), id, req.Name, req.Symbol)
+	if err != nil {
+		switch {
+		case errors.Is(err, ErrNotFound):
+			c.JSON(http.StatusNotFound, gin.H{"error": "unit not found"})
+		case errors.Is(err, ErrSymbolTaken):
+			c.JSON(http.StatusConflict, gin.H{"error": "symbol already in use"})
+		default:
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to update unit"})
+		}
+		return
+	}
+	c.JSON(http.StatusOK, toResponse(u))
+}
+
+func (h *Handler) Delete(c *gin.Context) {
+	id, err := uuid.Parse(c.Param("id"))
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
+		return
+	}
+	if err := h.service.Delete(c.Request.Context(), id); err != nil {
+		switch {
+		case errors.Is(err, ErrNotFound):
+			c.JSON(http.StatusNotFound, gin.H{"error": "unit not found"})
+		case errors.Is(err, ErrInUse):
+			c.JSON(http.StatusConflict, gin.H{"error": "unit is used by existing price tiers"})
+		default:
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to delete unit"})
+		}
+		return
+	}
+	c.Status(http.StatusNoContent)
+}