main.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"math/rand"
	"net/http"
	"strconv"

	"github.com/gorilla/mux"
)

type Movie struct {
	Director *Director `json:"director"`
	ID       string    `json:"id"`
	Isbn     string    `json:"isbn"`
	Title    string    `json:"title"`
}

type Director struct {
	FirstName string `json:"firstname"`
	LastName  string `json:"lastname"`
}

var movies []Movie

func main() {
	r := mux.NewRouter()

	r.HandleFunc("/movies", getMovies).Methods("GET")
	r.HandleFunc("/movies", createMovie).Methods("POST")
	r.HandleFunc("/movies/{id}", getMoviesById).Methods("GET")
	r.HandleFunc("/movies/{id}", updateMovie).Methods("PUT")
	r.HandleFunc("/movies/{id}", deleteMovie).Methods("DELETE")

	fmt.Println("Server is listening on port 8000")
	log.Fatal(http.ListenAndServe(":8000", r))
}

func getMovies(w http.ResponseWriter, _ *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(movies)
}

func getMoviesById(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	params := mux.Vars(r)
	for _, item := range movies {
		if item.ID == params["id"] {
			json.NewEncoder(w).Encode(item)
			return
		}
	}
}

func createMovie(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	movie := Movie{}
	_ = json.NewDecoder(r.Body).Decode(&movie)
	movie.ID = strconv.Itoa(rand.Intn(10000000))
	movies = append(movies, movie)
	json.NewEncoder(w).Encode(movie)
}

func deleteMovie(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	params := mux.Vars(r)
	for idx, itm := range movies {
		if itm.ID == params["id"] {
			movies = append(movies[:idx], movies[idx+1:]...)
			break
		}
	}
	json.NewEncoder(w).Encode(movies)
}

func updateMovie(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	params := mux.Vars(r)
	for idx, itm := range movies {
		if itm.ID == params["id"] {
			movies = append(movies[:idx], movies[idx+1:]...)
			movie := Movie{}
			_ = json.NewDecoder(r.Body).Decode(&movie)
			movie.ID = strconv.Itoa(rand.Intn(10000000))
			movies = append(movies, movie)
			json.NewEncoder(w).Encode(movie)
			return
		}
	}
}