refactor: restructure in entirety

internal/handler/buyer.go

@@ -0,0 +1,107 @@
+package handler
+
+import "billit/internal/view"
+import (
+	"billit/internal/database"
+	"net/http"
+
+	"github.com/labstack/echo/v4"
+)
+
+// BuyerHandlers holds db reference for buyer operations
+type BuyerHandlers struct {
+	db database.Service
+}
+
+// NewBuyerHandlers creates handlers with db access
+func NewBuyerHandlers(db database.Service) *BuyerHandlers {
+	return &BuyerHandlers{db: db}
+}
+
+// BuyerListHandler renders the /buyer page with all buyers
+func (h *BuyerHandlers) BuyerListHandler(c echo.Context) error {
+	userID := getUserID(c)
+	buyers, err := h.db.GetAllBuyerDetails(userID)
+	if err != nil {
+		return view.RenderServerError(c, "Failed to load buyers. Please try again.")
+	}
+	return view.Render(c, view.BuyerListPage(buyers))
+}
+
+// BuyerCreatePageHandler renders the /buyer/create form page
+func (h *BuyerHandlers) BuyerCreatePageHandler(c echo.Context) error {
+	return view.Render(c, view.BuyerCreatePage())
+}
+
+// BuyerEditPageHandler renders the /buyer/edit/:id form page
+func (h *BuyerHandlers) BuyerEditPageHandler(c echo.Context) error {
+	id := c.Param("id")
+	userID := getUserID(c)
+
+	buyer, err := h.db.GetBuyerDetails(id, userID)
+	if err != nil || buyer == nil {
+		return view.RenderNotFound(c, "Buyer not found or you don't have access to it.")
+	}
+	return view.Render(c, view.BuyerEditPage(*buyer))
+}
+
+// BuyerCreateHandler handles POST /buyer/create
+func (h *BuyerHandlers) BuyerCreateHandler(c echo.Context) error {
+	userID := getUserID(c)
+	if userID == "" {
+		return c.Redirect(http.StatusFound, "/")
+	}
+
+	name := c.FormValue("name")
+	if name == "" {
+		return c.String(http.StatusBadRequest, "Name is required")
+	}
+
+	details := c.FormValue("details")
+
+	_, err := h.db.CreateBuyerDetails(userID, name, details)
+	if err != nil {
+		return c.String(http.StatusInternalServerError, "Failed to create buyer")
+	}
+
+	return c.Redirect(http.StatusFound, "/buyer")
+}
+
+// BuyerUpdateHandler handles POST /buyer/edit/:id
+func (h *BuyerHandlers) BuyerUpdateHandler(c echo.Context) error {
+	userID := getUserID(c)
+	if userID == "" {
+		return c.Redirect(http.StatusFound, "/")
+	}
+
+	id := c.Param("id")
+	name := c.FormValue("name")
+	if name == "" {
+		return c.String(http.StatusBadRequest, "Name is required")
+	}
+
+	details := c.FormValue("details")
+
+	err := h.db.UpdateBuyerDetails(id, userID, name, details)
+	if err != nil {
+		return c.String(http.StatusInternalServerError, "Failed to update buyer")
+	}
+
+	return c.Redirect(http.StatusFound, "/buyer")
+}
+
+// BuyerDeleteHandler handles DELETE /buyer/:id
+func (h *BuyerHandlers) BuyerDeleteHandler(c echo.Context) error {
+	userID := getUserID(c)
+	if userID == "" {
+		return c.String(http.StatusUnauthorized, "Unauthorized")
+	}
+
+	id := c.Param("id")
+	err := h.db.DeleteBuyerDetails(id, userID)
+	if err != nil {
+		return c.String(http.StatusInternalServerError, "Failed to delete buyer")
+	}
+
+	return c.NoContent(http.StatusOK)
+}