main.go

package main

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

	"github.com/gorilla/mux"
)

type Movie struct {
	ID       string    `json: "ID"`
	Isbn     string    `json: "Isbn"`
	Title    string    `json: "Title"`
	Director *Director `json: "Director"`
}
type Director struct {
	FirstName string `json: "FirstName"`
	LastName  string `json: "LastName"`
}

var movies []Movie

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

func getMovie(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")
	var movie Movie
	_ = json.NewDecoder(r.Body).Decode(&movie)
	movie.ID = strconv.Itoa(rand.Intn(10000))
	movies = append(movies, movie)
	json.NewEncoder(w).Encode(movie)

}
func updateMovie(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-type", "application/json")
	params := mux.Vars(r)

	for index, item := range movies {
		if item.ID == params["id"] {
			movies = append(movies[:index], movies[index+1:]...)
			var movie Movie
			_ = json.NewDecoder(r.Body).Decode(&movie)
			movie.ID = params["id"]
			movies = append(movies, movie)
			json.NewEncoder(w).Encode(movie)
			return
		}

	}
}

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

}
func main() {
	r := mux.NewRouter()
	movies = append(movies, Movie{ID: "1", Isbn: "438227", Title: "movie one", Director: &Director{FirstName: "john", LastName: "doe"}})
	movies = append(movies, Movie{ID: "2", Isbn: "474747", Title: "movie two", Director: &Director{FirstName: "johnny", LastName: "doey"}})
	r.HandleFunc("/movies", getMovies).Methods("GET")
	r.HandleFunc("/movies/{id}", getMovie).Methods("GET")
	r.HandleFunc("/movies", createMovie).Methods("POST")
	r.HandleFunc("/movies/{id}", updateMovie).Methods("PUT")
	r.HandleFunc("/movies/{id}", deleteMovie).Methods("DELETE")

	fmt.Printf("starting server at port 8090\n")
	log.Fatal(http.ListenAndServe(":8090", r))

}