// 読み込んだデータを1行ずつ格納する配列
(()=>{
        var allData = [];
        var now_question = 0;
        var QUIZcsv = "4taku.csv";
     
        function setQuestion(number){
    	var q = allData[number];
    	console.log(`number=${number}`);
    	document.getElementById("id_question").innerHTML=q.Q
    	document.getElementById("id_ChoiceA").innerHTML=q.A
    	document.getElementById("id_ChoiceB").innerHTML=q.B
    	document.getElementById("id_ChoiceC").innerHTML=q.C;
    	document.getElementById("id_ChoiceD").innerHTML=q.D;
    	document.getElementById("id_mondaigazo").src="img/"+q.IMG;
    	document.getElementById("id_kotae").innerHTML='';
    	// document.getElementById("id_miryo").innerHTML='';
        }
     
        function slide(n) {
    	let len = allData.length
    	now_question = (len+now_question+n)%len;
    	setQuestion(now_question);
        }
        function left() {slide(-1);}
        function right() {slide(1);}
     
        function answer(e){
    	var seikai = allData[now_question].ANS,
    	    kaisetsu = allData[now_question].TEXT;
    	var kaitou = e.target.value;
    	if (kaitou == seikai){
    	    document.getElementById("id_pf").innerHTML='正解です';
    	    document.getElementById("id_kotae").innerHTML=kaisetsu;
    	     document.body.style.background = "#d8e698";
    	} else {
    	    // 不正解の時は背景色を変えたい
    	    document.getElementById("id_pf").innerHTML='不正解 もう一度答えてみよう!';
    	     document.body.style.background = "#696969 ";
    	}
        }
     
        function loadCSV(targetFile) {
    	fetch(targetFile).			// csvfileをサーバから読み込んで
    	    then((resp) => {		// 応答がrespに入るので
    		if (resp.ok) return resp.text();	// テキストを返す
    	    }).then((txt) => {		// テキストが txt に入るので
    		allData = new CSV(txt, {header: true}).parse(); // CSV解析
    		setQuestion(0);	// 最初の行のデータを表示
    		//console.log(`n=${allData.length}`);
    		//console.log(`1=${allData[1].TEXT}`);
    	    });;
    	
        }
        document.addEventListener("DOMContentLoaded", function() {
    	loadCSV(QUIZcsv);
    	var checks = document.getElementsByTagName('input'); //すべてのinput
    	for (let item of checks) {
    	    if (item.getAttribute("name") == "questions") {
    		item.addEventListener("click", answer, false);	//answer()関数を呼ぶ
    	    }
    	}
    	document.getElementById("left").addEventListener("click", left);
    	document.getElementById("right").addEventListener("click", right);
        }, false);
    })();