// Chapter 34 example: a template in its own file.
//
// Run from this folder, because the template path is relative to it:
//   cd exercises/34/05-template-file
//   go run .

package main

import (
	"bytes"
	"fmt"
	"html/template"
	"net/http"
)

type scorePage struct {
	Player string
	Scores []int
}

var scoreTemplate *template.Template

func handleHome(w http.ResponseWriter, r *http.Request) {
	data := scorePage{Player: "Keiko", Scores: []int{40, 25, 70}}

	var page bytes.Buffer
	err := scoreTemplate.Execute(&page, data)
	if err != nil {
		fmt.Println("Template error:", err)
		http.Error(w, "The page could not be built.", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	page.WriteTo(w)
}

func main() {
	parsed, err := template.ParseFiles("templates/scores.html")
	if err != nil {
		fmt.Println("Could not read the template:", err)
		fmt.Println("Run this program from its own folder, and check the template.")
		return
	}
	scoreTemplate = parsed

	http.HandleFunc("GET /{$}", handleHome)

	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)
	}
}