// Homework 33, problem 3: A rating form.
//
// The form is finished. Write handleRating: read "rating" with r.FormValue,
// convert it with strconv.Atoi, and reply with status 400 if it is not a whole
// number from 1 to 5. Otherwise print the rating to the terminal, and redirect
// to /thanks with status 303.
//
// Run with: go run exercises/33/homework/03-rating-form.go

package main

import (
	"fmt"
	"net/http"
)

const formPage = `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Rate this book</title>
</head>
<body>
<h1>Rate this book</h1>
<form action="/rating" method="post">
<p><label>Rating from 1 to 5: <input type="text" name="rating"></label></p>
<p><button type="submit">Send</button></p>
</form>
</body>
</html>
`

func handleForm(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	fmt.Fprint(w, formPage)
}

func handleRating(w http.ResponseWriter, r *http.Request) {
	// TODO: write your code here, in place of this placeholder line:
	fmt.Fprintln(w, "TODO: replace this line")
}

func handleThanks(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "Thank you for your rating.")
}

func main() {
	http.HandleFunc("GET /{$}", handleForm)
	http.HandleFunc("POST /rating", handleRating)
	http.HandleFunc("GET /thanks", handleThanks)

	fmt.Println("Server running at http://localhost:8080")
	fmt.Println("Press Ctrl+C to stop it.")

	err := http.ListenAndServe("localhost:8080", nil)
	if err != nil {
		fmt.Println("Server stopped:", err)
	}
}