#!/usr/bin/env js

(() => {
    var timer = null, count = 5; msgArea = null;
    function countdown() {
	count --;
	msgArea.innerText = `爆発まで あと${count}秒`;
	if (count==0) {
	    alert("ボカーーーンドンガラガッシャーン");
	    msgArea.innerText = `正解は ${answer+1} だったよ!`;
	} else {
	    timer = setTimeout(countdown, 1000);  //1秒待つ
	}
    }
    function stop() {
	clearTimeout(timer);
	document.body.style.background = "#00ff00";
	msgArea.innerText = "世界は救われた";
	msgArea.style.fontSize = "200%";
	msgArea.style.fontWeight = "bold";
    }
    function init() {
	let divs = document.querySelectorAll("div")
	msgArea = document.getElementById("message");
	if (divs.length == 0) {
	    alert("divがないよ!"); return;
	}
	let answer = Math.floor(Math.random()*10)
	console.log(`当たりは${answer+1}だよ`)
	atari = divs[answer];
	if (count>0) {
	    atari.addEventListener("click", stop);
	    timer = setTimeout(countdown, 1000);
	}
    };

    document.addEventListener("DOMContentLoaded", init)
})();