Add solution for gin challenge-1-basic-routing (#708)

Co-authored-by: go-interview-practice-bot[bot] <230190823+go-interview-practice-bot[bot]@users.noreply.github.com>

Author: AlexO-85

packages/gin/challenge-1-basic-routing/submissions/AlexO-85/solution.go

@@ -0,0 +1,253 @@
+package main
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// User represents a user in our system
+type User struct {
+	ID    int    `json:"id" binding:"omitempty,number"`
+	Name  string `json:"name" binding:"required"`
+	Email string `json:"email" binding:"required,email"`
+	Age   int    `json:"age" binding:"required,number"`
+}
+
+// Response represents a standard API response
+type Response struct {
+	Success bool        `json:"success"`
+	Data    interface{} `json:"data,omitempty"`
+	Message string      `json:"message,omitempty"`
+	Error   string      `json:"error,omitempty"`
+	Code    int         `json:"code,omitempty"`
+}
+
+// In-memory storage
+var users = []User{
+	{ID: 1, Name: "John Doe", Email: "[email protected]", Age: 30},
+	{ID: 2, Name: "Jane Smith", Email: "[email protected]", Age: 25},
+	{ID: 3, Name: "Bob Wilson", Email: "[email protected]", Age: 35},
+}
+var nextID = 4
+
+func main() {
+	router := gin.Default()
+
+	// TODO: Setup routes
+	// GET /users - Get all users
+	router.GET("/users", getAllUsers)
+	// GET /users/:id - Get user by ID
+	router.GET("/users/:id", getUserByID)
+	// POST /users - Create new user
+	router.POST("/users", createUser)
+	// PUT /users/:id - Update user
+	router.PUT("/users/:id", updateUser)
+	// DELETE /users/:id - Delete user
+	router.DELETE("/users/:id", deleteUser)
+	// GET /users/search - Search users by name
+	router.GET("/users/search", searchUsers)
+
+	router.Run("localhost:8080")
+}
+
+// TODO: Implement handler functions
+
+// getAllUsers handles GET /users
+func getAllUsers(c *gin.Context) {
+	response := Response{
+		Success: true,
+		Data:    users,
+	}
+	c.IndentedJSON(http.StatusOK, response)
+}
+
+// getUserByID handles GET /users/:id
+func getUserByID(c *gin.Context) {
+	idStr := c.Param("id")
+	// Handle invalid ID format
+	id, err := strconv.Atoi(idStr)
+	if err != nil {
+		response := Response{
+			Success: false,
+			Error:   "User ID format is wrong",
+			Message: err.Error(),
+			Code:    http.StatusBadRequest,
+		}
+		c.IndentedJSON(http.StatusBadRequest, response)
+		return
+	}
+
+	if user, _ := findUserByID(id); user != nil {
+		response := Response{
+			Success: true,
+			Data:    user,
+		}
+		c.IndentedJSON(http.StatusOK, response)
+		return
+	}
+
+	response := Response{
+		Success: false,
+		Error:   "User not found",
+		Code:    http.StatusNotFound,
+	}
+
+	c.IndentedJSON(http.StatusNotFound, response)
+}
+
+// createUser handles POST /users
+func createUser(c *gin.Context) {
+	var user User
+
+	if err := c.ShouldBindJSON(&user); err != nil {
+		response := Response{
+			Success: false,
+			Error:   "Bas request",
+			Message: err.Error(),
+			Code:    http.StatusBadRequest,
+		}
+		c.IndentedJSON(http.StatusBadRequest, response)
+		return
+	}
+
+	user.ID = nextID
+	users = append(users, user)
+	nextID++
+
+	response := Response{
+		Success: true,
+		Data:    user,
+	}
+	c.IndentedJSON(http.StatusCreated, response)
+}
+
+// updateUser handles PUT /users/:id
+func updateUser(c *gin.Context) {
+	idStr := c.Param("id")
+	// Handle invalid ID format
+	id, err := strconv.Atoi(idStr)
+	if err != nil {
+		response := Response{
+			Success: false,
+			Error:   "User ID format is wrong",
+			Message: err.Error(),
+			Code:    http.StatusBadRequest,
+		}
+		c.IndentedJSON(http.StatusBadRequest, response)
+		return
+	}
+
+	var newUser User
+
+	if err := c.ShouldBindJSON(&newUser); err != nil {
+		response := Response{
+			Success: false,
+			Error:   "Bas request",
+			Message: err.Error(),
+			Code:    http.StatusBadRequest,
+		}
+		c.IndentedJSON(http.StatusBadRequest, response)
+		return
+	}
+
+	if user, _ := findUserByID(id); user != nil {
+		user.Name = newUser.Name
+		user.Email = newUser.Email
+		user.Age = newUser.Age
+
+		response := Response{
+			Success: true,
+			Data:    user,
+		}
+		c.IndentedJSON(http.StatusOK, response)
+		return
+	}
+
+	response := Response{
+		Success: false,
+		Error:   "User not found",
+		Code:    http.StatusNotFound,
+	}
+
+	c.IndentedJSON(http.StatusNotFound, response)
+}
+
+// deleteUser handles DELETE /users/:id
+func deleteUser(c *gin.Context) {
+	idStr := c.Param("id")
+	// Handle invalid ID format
+	id, err := strconv.Atoi(idStr)
+	if err != nil {
+		response := Response{
+			Success: false,
+			Error:   "User ID format is wrong",
+			Message: err.Error(),
+			Code:    http.StatusBadRequest,
+		}
+		c.IndentedJSON(http.StatusBadRequest, response)
+		return
+	}
+
+	if user, i := findUserByID(id); user != nil {
+		response := Response{
+			Success: true,
+			Data:    user,
+		}
+		c.IndentedJSON(http.StatusOK, response)
+
+		users = append(users[:i], users[i+1:]...)
+
+		return
+	}
+
+	response := Response{
+		Success: false,
+		Error:   "User not found",
+		Code:    http.StatusNotFound,
+	}
+
+	c.IndentedJSON(http.StatusNotFound, response)
+}
+
+// searchUsers handles GET /users/search?name=value
+func searchUsers(c *gin.Context) {
+
+	name := strings.ToLower(c.Query("name"))
+
+	if name == "" {
+		response := Response{
+			Success: false,
+			Error:   "Name parameter is missing",
+			Code:    http.StatusBadRequest,
+		}
+		c.IndentedJSON(http.StatusBadRequest, response)
+		return
+	}
+
+	found := []User{}
+
+	for _, user := range users {
+		if strings.Contains(strings.ToLower(user.Name), name) {
+			found = append(found, user)
+		}
+	}
+
+	response := Response{
+		Success: true,
+		Data:    found,
+	}
+	c.IndentedJSON(http.StatusOK, response)
+}
+
+// Helper function to find user by ID
+func findUserByID(id int) (*User, int) {
+	for i := range users {
+		if users[i].ID == id {
+			return &users[i], i
+		}
+	}
+	return nil, -1
+}