cli example

internal/handler/coffee_handler.go

@@ -0,0 +1,131 @@
+package handler
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+
+	"awesome_cli/internal/service"
+	"awesome_cli/pkg/ui"
+
+	libErr "code.linberg.su/linberg/awesome-back/pkg/errors"
+)
+
+type CoffeeHandler struct {
+	coffeeService *service.CoffeeService
+}
+
+func NewCoffeeHandler(coffeeService *service.CoffeeService) *CoffeeHandler {
+	return &CoffeeHandler{
+		coffeeService: coffeeService,
+	}
+}
+
+func (h *CoffeeHandler) HandleList() error {
+	coffees, err := h.coffeeService.GetAllCoffees()
+	if err != nil {
+		return h.handleError(err, "Failed to list coffees")
+	}
+
+	h.printCoffeesTable(coffees)
+	return nil
+}
+
+func (h *CoffeeHandler) HandleGet(coffeeID string) error {
+	id, err := strconv.Atoi(coffeeID)
+	if err != nil {
+		return libErr.NewInvalidError("coffee ID must be a number")
+	}
+
+	coffee, err := h.coffeeService.GetCoffeeByID(id)
+	if err != nil {
+		return h.handleError(err, fmt.Sprintf("Failed to get coffee with ID %d", id))
+	}
+
+	h.printCoffeeDetail(coffee)
+	return nil
+}
+
+func (h *CoffeeHandler) HandleGetWithRetry(coffeeID string, maxRetries int) error {
+	id, err := strconv.Atoi(coffeeID)
+	if err != nil {
+		return libErr.NewInvalidError("coffee ID must be a number")
+	}
+
+	fmt.Printf("Fetching coffee with ID %d (max retries: %d)...\n", id, maxRetries)
+
+	coffee, err := h.coffeeService.GetCoffeeByIDWithRetry(id, maxRetries)
+	if err != nil {
+		return h.handleError(err, fmt.Sprintf("Failed to get coffee with ID %d after retries", id))
+	}
+
+	h.printCoffeeDetail(coffee)
+	return nil
+}
+
+func (h *CoffeeHandler) printCoffeesTable(coffees []service.Coffee) {
+	t := ui.NewTableBuilder()
+	t.AddTableHeader("ID", "Name", "Price", "Size", "Description")
+	for _, coffee := range coffees {
+		t.AddRow(
+			strconv.FormatInt(int64(coffee.ID), 10),
+			coffee.Name,
+			strconv.FormatInt(int64(coffee.Price), 10),
+			coffee.Size,
+			coffee.Description,
+		)
+	}
+
+	fmt.Println(t.CreateTable())
+}
+
+func (h *CoffeeHandler) printCoffeeDetail(coffee *service.Coffee) {
+	fmt.Printf("ID:          %s\n", ui.SetColor(ui.Green, strconv.FormatInt(int64(coffee.ID), 10)))
+	fmt.Printf("Name:        %s\n", ui.SetColor(ui.Green, coffee.Name))
+	fmt.Printf("Price:       %s\n", ui.SetColor(ui.Green, fmt.Sprintf("%.2f ₽", coffee.Price)))
+	fmt.Printf("Size:        %s\n", ui.SetColor(ui.Green, coffee.Size))
+	fmt.Printf("Description: %s\n", ui.SetColor(ui.Green, coffee.Description))
+	fmt.Println()
+}
+
+// handleError демонстрирует продвинутую обработку ошибок
+func (h *CoffeeHandler) handleError(err error, message string) error {
+	red := func(s string) string {
+		return ui.SetColor(ui.Red, s)
+	}
+
+	fmt.Printf("%s: %s\n", red("Error"), message)
+
+	// Демонстрация использования errors.Is и errors.As
+	switch {
+	case libErr.IsNotFound(err):
+		fmt.Printf("%s: Resource not found\n", red("Type"))
+		fmt.Printf("%s: %v\n", red("Details"), err)
+
+	case libErr.IsInvalid(err):
+		fmt.Printf("%s: Invalid request\n", red("Type"))
+		fmt.Printf("%s: %v\n", red("Details"), err)
+
+	case libErr.IsNetworkError(err):
+		fmt.Printf("%s: Network error\n", red("Type"))
+		fmt.Printf("%s: Please check your connection and try again\n", red("Details"))
+
+	default:
+		// Используем errors.As для получения дополнительной информации
+		var appErr *libErr.AppError
+		if errors.As(err, &appErr) {
+			fmt.Printf("%s: %s\n", red("Type"), string(appErr.Type))
+			fmt.Printf("%s: %s\n", red("Message"), appErr.Message)
+
+			// Демонстрация unwrap цепочки ошибок
+			if appErr.Err != nil {
+				fmt.Printf("%s: %v\n", red("Underlying error"), appErr.Err)
+			}
+		} else {
+			fmt.Printf("%s: %v\n", red("Unknown error"), err)
+		}
+	}
+
+	fmt.Println() // Пустая строка для читабельности
+	return err
+}