package main

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

type task struct {
	Name string
	Done bool
}

var tasks = []task{
	{Name: "Install Go", Done: true},
	{Name: "Write a server", Done: true},
	{Name: "Finish this homework", Done: false},
}

const tasksText = `<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Tasks</title>
</head>
<body>
<h1>Tasks</h1>
<ul>
{{range .}}
<li>{{.Name}}{{if .Done}} (done){{end}}</li>
{{else}}
<li>Nothing to do.</li>
{{end}}
</ul>
</body>
</html>
`

var tasksTemplate = template.Must(template.New("tasks").Parse(tasksText))

func handleHome(w http.ResponseWriter, r *http.Request) {
	var page bytes.Buffer
	err := tasksTemplate.Execute(&page, tasks)
	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() {
	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)
	}
}