package main

import (
	"fmt"
	"github.com/julienschmidt/httprouter"
	"net/http"
	"strconv"
)

// "POST /v1/movies" endpoint.
func (app *application) createMovieHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "create a new movie")
}

// "GET /v1/movies/:id"
func (app *application) showMovieHandler(w http.ResponseWriter, r *http.Request) {
	/*
		When httprouter is parsing a request, any interpolated URL parameters will be
		stored in the request context. We can use the ParamsFromContext() function to
		retrieve a slice containing these parameter names and values.
	*/
	params := httprouter.ParamsFromContext(r.Context())

	/*
		We can then use the ByName() method to get the value of the "id" parameter from
		the slice. In our project all movies will have a unique positive integer ID, but
		the value returned by ByName() is always a string. So we try to convert it to a
		base 1° integer (with a bit size of 64). If the parameter couldn't be converted,
		or is less than 1, we know the ID is invalid so we use the http.NotFound()
		func to return a 404 Not Found Response.
	*/
	id, err := strconv.ParseInt(params.ByName("id"), 10, 64)
	if err != nil || id < 1 {
		http.NotFound(w, r)
		return
	}

	// Otherwise, interpolate the movie ID in a placeholder response.
	fmt.Fprintf(w, "show the details of movie %d\n", id)
}