// modified from https://stackoverflow.com/a/14051331
// Issue is keycode conversion for non-alphanumeric keys (e.g. period)
// is not accurate
function convertKeyCode(evt) {
    var chara = "";
    var keyCode = (evt.which) ? evt.which : evt.keyCode;
    var shift = evt.shiftKey;
    if (keyCode == 19)
	chara = "pause/break";
    if (keyCode == 48)
	chara = (shift) ? ")" : "0";
    if (keyCode == 49)
	chara = (shift) ? "!" : "1";
    if (keyCode == 50)
	chara = (shift) ? "@" : "2";
    if (keyCode == 51)
	chara = (shift) ? "#" : "3";
    if (keyCode == 52)
	chara = (shift) ? "$" : "4";
    if (keyCode == 53)
	chara = (shift) ? "%" : "5";
    if (keyCode == 54)
	chara = (shift) ? "^" : "6";
    if (keyCode == 55)
	chara = (shift) ? "&" : "7";
    if (keyCode == 56)
	chara = (shift) ? "*" : "8";
    if (keyCode == 57)
	chara = (shift) ? "(" : "9";
    if (keyCode == 65)
	chara = (shift) ? "A" : "a";
    if (keyCode == 66)
	chara = (shift) ? "B" : "b";
    if (keyCode == 67)
	chara = (shift) ? "C" : "c";
    if (keyCode == 68)
	chara = (shift) ? "D" : "d";
    if (keyCode == 69)
	chara = (shift) ? "E" : "e";
    if (keyCode == 70)
	chara = (shift) ? "F" : "f";
    if (keyCode == 71)
	chara = (shift) ? "G" : "g";
    if (keyCode == 72)
	chara = (shift) ? "H" : "h";
    if (keyCode == 73)
	chara = (shift) ? "I" : "i";
    if (keyCode == 74)
	chara = (shift) ? "J" : "j";
    if (keyCode == 75)
	chara = (shift) ? "K" : "k";
    if (keyCode == 76)
	chara = (shift) ? "L" : "l";
    if (keyCode == 77)
	chara = (shift) ? "M" : "m";
    if (keyCode == 78)
	chara = (shift) ? "N" : "n";
    if (keyCode == 79)
	chara = (shift) ? "O" : "o";
    if (keyCode == 80)
	chara = (shift) ? "P" : "p";
    if (keyCode == 81)
	chara = (shift) ? "Q" : "q";
    if (keyCode == 82)
	chara = (shift) ? "R" : "r";
    if (keyCode == 83)
	chara = (shift) ? "S" : "s";
    if (keyCode == 84)
	chara = (shift) ? "T" : "t";
    if (keyCode == 85)
	chara = (shift) ? "U" : "u";
    if (keyCode == 86)
	chara = (shift) ? "V" : "v";
    if (keyCode == 87)
	chara = (shift) ? "W" : "w";
    if (keyCode == 88)
	chara = (shift) ? "X" : "x";
    if (keyCode == 89)
	chara = (shift) ? "Y" : "y"; if (keyCode == 90)
	chara = (shift) ? "Z" : "z";
    if (keyCode == 93)
	chara = "select key";
    if (keyCode == 186 || keyCode == 59)
	chara = ";";
    if (keyCode == 187 || keyCode == 61)
	chara = "=";
    if (keyCode == 188)
	chara = ",";
    if (keyCode == 189 || keyCode == 173)
	chara = "-";
    if (keyCode == 190)
	chara = ".";
    if (keyCode == 191)
	chara = "/";
    if (keyCode == 192)
	chara = "`";
    if (keyCode == 219)
	chara = (shift) ? "{" : "[";
    if (keyCode == 220)
	chara = "\\";
    if (keyCode == 221)
	chara = (shift) ? "}" : "]";
    if (keyCode == 222)
	chara = "'";
    return chara;
}
const wordDisplay = document.getElementById("word");
const input = document.getElementById("input");
const timer = document.getElementById("timer");
const hintDisplay = document.getElementById("hint");
const incorrect = document.getElementById("incorrectSfx");
const correct = document.getElementById("correctSfx");
const success = document.getElementById("successSfx");
const leftShiftCode = 32; // space
const rightShiftCode = 16; // shift key
let leftShift = false;
let rightShift = false;
addEventListener("keydown", event => {
	switch(event.keyCode) {
		case leftShiftCode:
			leftShift = true;
			event.preventDefault();
			break;
		case rightShiftCode:
			rightShift = true;
			event.preventDefault();
			break;
	}
});
addEventListener("keyup", event => {
	switch(event.keyCode) {
		case leftShiftCode:
			leftShift = false;
			break;
		case rightShiftCode:
			rightShift = false;
			break;
	}
});
const check = () => {
	if (input.value == word) {
		if (repeats == 0) {
			success.currentTime = 0;
			success.play();
		} else {
			correct.currentTime = 0;
			correct.play();
		}
		clearTimeout(incorrectTimeout);
		clearTimeout(timerTimeout);
		wordDisplay.style.color = "green";
		wordDisplay.innerHTML = `${word} ⭕`;
		setTimeout(() => {
			wordDisplay.style.color = "";
			reset();
		}, 1000);
	}
};
addEventListener("compositionend", event => check());
input.addEventListener("keydown", e => {
	const pressed = convertKeyCode(e).toLowerCase(); // String.fromCharCode(e.keyCode).toLowerCase();
	if (keymap[pressed] !== undefined) {
		let valueIndex = 0;
		if (leftShift && keymap[pressed][1]) {
			valueIndex = 1;
		} else if (rightShift && keymap[pressed][2]) {
			valueIndex = 2;
		}
		input.value += keymap[pressed][valueIndex];
		check();
		e.preventDefault();
	} else if (pressed == " ") {
		e.preventDefault();
	}
});
// window.requestAnimationFrame() might be better suited
// https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame
let typeTimePerKana = 2; // in seconds
const typeTimePerKanaInput = document.getElementById("timePerKana");
typeTimePerKanaInput.value = typeTimePerKana;
typeTimePerKanaInput.addEventListener("change", (e) => {
	typeTimePerKana = typeTimePerKanaInput.value;
});
const timerFPS = 60;
let incorrectTimeout = null;
let timerTimeout = null;
let word = null;
let repeats = 0;
let failed = false;
let problemWords = [];
let problemTimes = [];
const reset = () => {
	failed = false;
	input.value = "";
	hint.innerHTML = "";
	timer.value = 1;
	if (repeats == 0) {
		if (problemTimes.length > 0 && new Date() - problemTimes[0] > 60000) {
			word = problemWords[0];
			problemWords.shift();
			problemTimes.shift();
		} else {
			word = words[Math.round(Math.random() * words.length)];
		}
	}
	wordDisplay.innerHTML = word;
	const typeTime = typeTimePerKana * word.length;
	incorrectTimeout = setTimeout(() => {
		if (!problemWords.includes(word)) {
			problemWords.push(word);
			problemTimes.push(new Date());
		}
		repeats += repeats == 0 ? 3 : 1;
		failed = true;
		wordDisplay.innerHTML = `${word} ❌`;
		incorrect.currentTime = 0;
		incorrect.play();
		for (let i = 0; i < word.length; i++) {
			const letter = word[i];
			let key = null;
			let index = null;
			for (let otherKey in keymap) {
				for (let i = 0; i < keymap[otherKey].length && !key; i++) {
					if (keymap[otherKey][i] == letter) {
						key = otherKey;
						index = i;
					}
				}
			}
			let t = `<h3>${letter.toUpperCase()}：<kbd`;
			if (index > 0) {
				t += ' style="background: ';
				if (index == 1) {
					t += "yellow";
				} else if (index == 2) {
					t += "cyan";
				} else if (index == 3) {
					t += "magenta";
				}
				t += '"';
			}
			t += `>${key}</kbd></h3>`;
			hint.innerHTML += t;
		}
	}, typeTime * 1000);
	clearInterval(timerTimeout);
	timerTimeout = setInterval(() => {
		timer.value -= (1 / timerFPS) / typeTime;
	}, 1000 / timerFPS);
	if (repeats > 0) {
		repeats--;
	}
};
reset();