main.go

package main

import (
	"github.com/gin-gonic/gin"    // Import the packages
	"net/http"                    // needed for your code.
)

type Car struct {               // Declaring Car struct.
	ID    string `json:"id"`      // "json" tag specifies what a field’s
	Title string `json:"title"`   // name should be when the struct’s
	Color string `json:"color"`   // contents are serialized into JSON.
}

var Cars []Car                  // Creating an empty slice of Car struct.

func main() {
	Cars = []Car{                                      // Declaring a data, 
		{ID: "1", Title: "BMW", Color: "Black"},         // which our Cars slice
		{ID: "2", Title: "Tesla", Color: "Red"},         // will contain of.
	}

	router := gin.Default()                            // Initializing a Gin router.
	router.GET("/cars", getCars)                       // Assigning handler's
	router.GET("/cars/:id", getCarByID)                // functions to
	router.POST("/cars", createCar)                    // different
	router.DELETE("/cars/:id", deleteCar)              // endpoint paths.

	router.Run("localhost:8080")                       // Attaching the router to http.Server and starting the server.
}

func createCar(c *gin.Context) {
	var newCar Car                                   	 // Declare a new Car variable.
	if err := c.BindJSON(&newCar); err != nil {        // Bind the request body to newCar variable.
		c.IndentedJSON(http.StatusBadRequest,       	   // Return 400 Status Code,
    	gin.H{"message": "Failed to create a car"})    // and error message if binding has failed.
		return
	}

	Cars = append(Cars, newCar)                        // Append the received Car struct to the Cars slice.
	c.IndentedJSON(http.StatusCreated, newCar)         // Add status code with JSON representing new car to the response.
}

func getCars(c *gin.Context) {
	c.IndentedJSON(http.StatusOK, Cars)                // Add status code with JSON representing the Cars slice.
}

func getCarByID(c *gin.Context) {
	for _, car := range Cars {                         // Loop through Cars slice.
		if car.ID == c.Param("id") {                     // Extract the ID in the request path and locate a car that matches.
			c.IndentedJSON(http.StatusOK, car)             // Add status code with JSON representing a car found by provided ID.
			return
		}
	}
	c.IndentedJSON(http.StatusNotFound,                // Return 400 Status Code and 
  	gin.H{"message": "Requested car is not found"})  // error message if no car was found.
}

func deleteCar(c *gin.Context) {
	for index, car := range Cars {                     // Loop through Cars slice.
		if car.ID == c.Param("id") {                     // Extract the ID in the request path and locate a car that matches.
			Cars = append(Cars[:index], Cars[index+1:]...) // Delete found car from slice.
			c.IndentedJSON(http.StatusOK,                  // Return 400 Status Code,
      	gin.H{"message": "Car is deleted"})          // and success message.
			return
		} 
	}
	c.IndentedJSON(http.StatusNotFound,                // Return 400 Status Code and
  	gin.H{"message": "Car is not found"})            // error message if no car was found.
}