package main

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

type handler = func(http.ResponseWriter, *http.Request)

func generateHandler(file string, handler func(), data func() any) handler {
	tmpl := template.Must(template.ParseFiles(fmt.Sprintf("templates/%s", file)))
	return func(w http.ResponseWriter, r *http.Request) {
		handler()
		w.Header().Set("Content-Type", "text/html; charset=utf-8")
		tmpl.Execute(w, data())
	}
}

func generateClick() handler {
	var clicks uint = 0
	return generateHandler(
		"click.html",
		func() { clicks++ },
		func() any { return clicks },
	)
}

func main() {
	http.Handle("/", http.FileServer(http.Dir("static")))
	http.HandleFunc("/api/click1", generateClick())
	http.HandleFunc("/api/click2", generateClick())
	http.HandleFunc("/api/click3", generateClick())
	log.Fatal(http.ListenAndServe(":3333", nil))
}