// Chapter 33 example: reading values from the path.
// Run with: go run exercises/33/02-path-values.go

package main

import (
	"fmt"
	"net/http"
	"strconv"
)

func handlePlayer(w http.ResponseWriter, r *http.Request) {
	name := r.PathValue("name")

	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	fmt.Fprintf(w, "This is the page of %s.\n", name)
}

func handleSquare(w http.ResponseWriter, r *http.Request) {
	n, err := strconv.Atoi(r.PathValue("n"))
	if err != nil {
		http.Error(w, "The path must end in a whole number.", http.StatusBadRequest)
		return
	}
	if n < -1000 || n > 1000 {
		http.Error(w, "The number must be from -1000 to 1000.", http.StatusBadRequest)
		return
	}

	fmt.Fprintf(w, "%d squared is %d\n", n, n*n)
}

func main() {
	http.HandleFunc("GET /players/{name}", handlePlayer)
	http.HandleFunc("GET /square/{n}", handleSquare)

	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)
	}
}