// Homework 34, challenge: Players from a template file.
//
// Finish the template in templates/players.html, then finish handleHome.
//
// GET / shows every player. GET /?min=50 shows only players with a score of 50
// or more. A min that is not a whole number replies with status 400.
//
// Run from this folder, because the template path is relative to it:
//   cd exercises/34/homework/04-players
//   go run .

package main

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

type player struct {
	Name  string
	Score int
}

type playersPage struct {
	Min     string
	Players []player
}

// Nothing changes this slice, so the handlers can share it.
var allPlayers = []player{
	{Name: "Keiko", Score: 70},
	{Name: "Arif", Score: 45},
	{Name: "Ada", Score: 90},
}

var playersTemplate *template.Template

func handleHome(w http.ResponseWriter, r *http.Request) {
	// TODO: read min, check it, and make a slice of the players to show.
	data := playersPage{Min: "", Players: allPlayers}

	var page bytes.Buffer
	err := playersTemplate.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/players.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
	}
	playersTemplate = 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)
	}
}