let wordClass = "noun";
let target = words(wordClass);
let targetLen = target.length;
console.log(targetLen);

let body = document.getElementsByTagName("body")[0];
let clsChg = document.getElementById("clsChg");
let display = document.getElementById("display");
let word = document.getElementById("word");
let pronunc = document.getElementById("pronunc");
let ans = [document.getElementById("ans_0"), document.getElementById("ans_1"), document.getElementById("ans_2"), document.getElementById("ans_3")]
let result = document.getElementById("result");
let scoreElemA = document.getElementById("scoreA");
let scoreElemB = document.getElementById("scoreB");
let corrCntElemA = document.getElementById("corrCntA");
let wrongCntElemA = document.getElementById("wrongCntA");
let corrCntElemB = document.getElementById("corrCntB");
let wrongCntElemB = document.getElementById("wrongCntB");
let perfect = document.getElementById("perfect");
let imperfect = document.getElementById("imperfect");
let replay = document.getElementById("replay");
let playAnother = document.getElementsByClassName("playAnother")[0];
let footer = document.getElementsByTagName("footer")[0];
let startSound = document.getElementById("startSound");
let corrSound = document.getElementById("corrSound");
let corrSound2 = document.getElementById("corrSound2");
let wrongSound = document.getElementById("wrongSound");

let curWordIdx;
let curCorrIdx;
let isClicked = [false, false, false, false];
let wordIdx;
let tmpWordIdx;
let wordTxt;
let corrDict;
let corrIdx;
let wrongIdx = [];
let tmpWrongIdx;
let cnt = 0;
let corrCnt = 0;
let wrongCnt = 0;
let wrongs = [];
let wrongsLen;
let mistakenWordIdx;
let mistakenWordMeaning;
let mistakenWordMeaningLen;
let mistakenWordMeaningTxt;
let wrongsTxt;
function randElem(arr) {
    return arr[Math.floor(Math.random() * arr.length)];
}
function setQuiz() {
    scoreElemA.style.display = "block";
    display.style.display = "table";
    result.style.display = "none";
    replay.style.display = "none";
    playAnother.style.display = "none";
    footer.style.display = "inline";
}
function removeQuiz() {
    display.style.display = "none";
    result.style.display = "block";
    replay.style.display = "block";
    playAnother.style.display = "block";
    footer.style.display = "none";
}
function quiz() {
    if (cnt == 20) {
        removeQuiz();
        cnt = 0;
        wrongsLen = wrongs.length;
        if (wrongsLen == 0) {
            perfect.style.display = "block";
            imperfect.style.display = "none";
            scoreElemA.style.display = "none";
            scoreElemB.style.display = "none";
            body.style.animation = "gaming 2s linear infinite";
            result.style.animation = "gaming 2s linear infinite";
            perfect.style.animation = "gaming 2s linear infinite";
            return [null, null];
        } else {
            perfect.style.display = "none";
            imperfect.style.display = "block";
            scoreElemA.style.display = "none";
            scoreElemB.style.display = "block";
            corrCntElemB.innerText = corrCnt;
            wrongCntElemB.innerText = wrongCnt;
            wrongsTxt = "";
            for (let i = 0; i < wrongsLen; ++i) {
                mistakenWordIdx = wrongs[i][0];
                mistakenWordMeaning = target[mistakenWordIdx]["meaning"];
                mistakenWordMeaningLen = mistakenWordMeaning.length;
                mistakenWordMeaningTxt = "'" + mistakenWordMeaning[0] + "'";
                if (mistakenWordMeaningLen != 0) {
                    for (let i = 1; i < mistakenWordMeaningLen; ++i) {
                        if (i == mistakenWordMeaningLen - 1) {
                            mistakenWordMeaningTxt += "</span> or <span style=\"color: red;\">'" + mistakenWordMeaning[i] + "'";
                        } else {
                            mistakenWordMeaningTxt += "</span>, <span style=\"color: red;\">'" + mistakenWordMeaning[i] + "'";
                        }
                    }
                }
                wrongsTxt += "<span style=\"color: red;\">'" + target[mistakenWordIdx]["word"] + "'</span>"
                    + " is <span style=\"color: red;\">"
                    + mistakenWordMeaningTxt + "</span>, not '" + wrongs[i][1] + "'.<br>"
            }
            imperfect.innerHTML = wrongsTxt.slice(0, -4);
            return [null, null];
        }
    } else {
        setQuiz();
        tmpWordIdx = Math.floor(Math.random() * targetLen);
        while (tmpWordIdx == wordIdx) {
            tmpWordIdx = Math.floor(Math.random() * targetLen);
        }
        wordIdx = tmpWordIdx;
        corrIdx = Math.floor(Math.random() * 4);
        console.log(corrIdx);
        for (let i = 0; i < 4; ++i) {
            if (i == corrIdx) continue;
            tmpWrongIdx = Math.floor(Math.random() * targetLen);
            while (wrongIdx.includes(tmpWrongIdx) || tmpWrongIdx == wordIdx) {
                tmpWrongIdx = Math.floor(Math.random() * targetLen);
            }
            wrongIdx.push(tmpWrongIdx);
            ans[i].innerText = randElem(target[tmpWrongIdx]["meaning"]);
        }
        wrongIdx = [];
        corrDict = target[wordIdx]
        wordTxt = corrDict["word"];
        if (corrDict["gender_is_distinctive"]) wordTxt += " (" + corrDict["gender"] + ")";
        word.innerText = wordTxt;
        pronunc.innerText = "[" + corrDict["pronunc"] + "]";
        ans[corrIdx].innerText = randElem(corrDict["meaning"]);
        cnt++;
        return [wordIdx, corrIdx]
    }
}
function start() {
    [curWordIdx, curCorrIdx] = quiz();
    startSound.currentTime = 0;
    startSound.play();
    corrCnt = 0;
    wrongCnt = 0;
    wrongs = [];
    isClicked = [false, false, false, false];
    corrCntElemA.innerText = 0;
    wrongCntElemA.innerText = 0;
    body.style.animation = "";
    result.style.animation = "";
}
start();
ans[0].addEventListener("click", () => {
    if (curCorrIdx == 0) {
        if (cnt == 20) {
            corrSound2.play();
        } else {
            corrSound.currentTime = 0;
            corrSound.play();
        }
        corrCnt++;
        corrCntElemA.innerText = corrCnt;
        [curWordIdx, curCorrIdx] = quiz();
        isClicked = [false, false, false, false];
    } else {
        wrongSound.currentTime = 0;
        wrongSound.play();
        if (isClicked[0]) return;
        wrongCnt++;
        wrongCntElemA.innerText = wrongCnt;
        isClicked[0] = true;
        wrongs.push([curWordIdx, ans[0].textContent]);
    }
})
ans[1].addEventListener("click", () => {
    if (curCorrIdx == 1) {
        if (cnt == 20) {
            corrSound2.play();
        } else {
            corrSound.currentTime = 0;
            corrSound.play();
        }
        corrCnt++;
        corrCntElemA.innerText = corrCnt;
        [curWordIdx, curCorrIdx] = quiz();
        isClicked = [false, false, false, false];
    } else {
        wrongSound.currentTime = 0;
        wrongSound.play();
        if (isClicked[1]) return;
        wrongCnt++;
        wrongCntElemA.innerText = wrongCnt;
        isClicked[1] = true;
        wrongs.push([curWordIdx, ans[1].textContent]);
    }
})
ans[2].addEventListener("click", () => {
    if (curCorrIdx == 2) {
        if (cnt == 20) {
            corrSound2.play();
        } else {
            corrSound.currentTime = 0;
            corrSound.play();
        }
        corrCnt++;
        corrCntElemA.innerText = corrCnt;
        [curWordIdx, curCorrIdx] = quiz();
        isClicked = [false, false, false, false];
    } else {
        wrongSound.currentTime = 0;
        wrongSound.play();
        if (isClicked[2]) return;
        wrongCnt++;
        wrongCntElemA.innerText = wrongCnt;
        isClicked[2] = true;
        wrongs.push([curWordIdx, ans[2].textContent]);
    }
})
ans[3].addEventListener("click", () => {
    if (curCorrIdx == 3) {
        if (cnt == 20) {
            corrSound2.play();
        } else {
            corrSound.currentTime = 0;
            corrSound.play();
        }
        corrCnt++;
        corrCntElemA.innerText = corrCnt;
        [curWordIdx, curCorrIdx] = quiz();
        isClicked = [false, false, false, false];
    } else {
        wrongSound.currentTime = 0;
        wrongSound.play();
        if (isClicked[3]) return;
        wrongCnt++;
        wrongCntElemA.innerText = wrongCnt;
        isClicked[3] = true;
        wrongs.push([curWordIdx, ans[3].textContent]);
    }
})
replay.addEventListener("click", start)
clsChg.addEventListener("click", () => {
    if (wordClass == "noun") {
        wordClass = "verb";
        clsChg.innerText = "V";
    } else {
        wordClass = "noun";
        clsChg.innerText = "N";
    }
    target = words(wordClass);
    targetLen = target.length;
    console.log(targetLen);
    cnt = 0;
    start();
})