function _promptGet() {
	return document.getElementById('prompt').textContent;
}

function _promptGetAndClear() {
	let val = _promptGet();
	promptClear();
	return val;
}

function _promptDeleteLast() {
	let elem = document.getElementById('prompt');
	elem.textContent = elem.textContent.slice(0, -1);
}

function _promptClear() {
	document.getElementById('prompt').textContent = '';
}

let prompt_handler;
let prompt_handlers = {
	visit: {
		append(val) {
			let elem = document.getElementById('prompt');
			if (elem.textContent.length < 3) {
				elem.textContent += val;
				promptUpdateRem();
			}
		},

		backspace() {
			_promptDeleteLast();
			promptUpdateRem();
		},

		clear() {
			_promptClear();
			promptUpdateRem();
		},

		submit() {
			let pts = _promptGetAndClear();
			if (pts)
				Module.ccall('user_visit', 'number', ['number'], [pts]);
		},

		submit_rem() {
			let rem = _promptGetAndClear();
			if (rem)
				Module.ccall('user_visit_to_rem', 'number', ['number'], [rem]);
		}
	},
	num_darts: {
		append(val) {
			let elem = document.getElementById('prompt');
			if (elem.textContent.length < 3)
				elem.textContent += val;
		},

		backspace() {
			_promptDeleteLast();
		},

		clear() {
			_promptClear();
		},

		submit() {
			let n = _promptGetAndClear();
			if (n)
				Module.ccall('resp_numdarts', null, ['number'], [n]);
		}
	},
	init: {
		submit() {
			Module.ccall('start_match');
		}
	}
}

function setPromptHandler(ptr) {
	prompt_handler = prompt_handlers[UTF8ToString(ptr)];
}

function promptAppend(...args) {
	clearOi();
	prompt_handler?.append?.(...args);
}

function promptClear(...args) {
	clearOi();
	prompt_handler?.clear?.(...args);
}

function promptBackspace(...args) {
	clearOi();
	prompt_handler?.backspace?.(...args);
}

function promptSubmit(...args) {
	clearOi();
	prompt_handler?.submit?.(...args);
}

function promptSubmitRem(...args) {
	clearOi();
	prompt_handler?.submit_rem?.(...args);
}

function clearMatchLog() {
	document.getElementById('match').textContent = '';
}

let oi_timeout;
function oi() {
	document.getElementById('oi').style.visibility = 'visible';

	oi_timeout = setTimeout(function() { oi_timeout = null; clearOi() }, 3000);
}

function clearOi() {
	document.getElementById('oi').style.visibility = 'hidden';

	if (oi_timeout) {
		clearTimeout(oi_timeout);
		oi_timeout = null;
	}
}

function setPlayerActive(n) {
	document.querySelectorAll('[id$=-state]').forEach(e =>
		e.classList[n && e.id == `p${n}-state` ? 'add' : 'remove']('active'));
}

function updatePlayerRem(n, ptr) {
	document.getElementById(`p${n}-rem`).textContent = UTF8ToString(ptr);
}

function updatePlayerName(n, ptr) {
	document.getElementById(`p${n}-name`).textContent = UTF8ToString(ptr);
}

function updatePlayerSugg(n, ptr) {
	document.getElementById(`p${n}-sugg`).textContent = UTF8ToString(ptr);
}

function updatePlayerAvg(n, avg) {
	document.getElementById(`p${n}-avg`).textContent = avg.toFixed(2);
}

function setPromptText(ptr) {
	document.getElementById('prompt').textContent = UTF8ToString(ptr);
}

function promptMsg(p) {
	document.getElementById('prompt-msg').textContent = UTF8ToString(p);
}

function promptSugg(p) {
	document.getElementById('prompt-sugg').textContent = UTF8ToString(p);
}

function promptUpdateRem() {
	Module.ccall('update_user_rem_from_pts', null, ['number'], [_promptGet()]);
}

function scheduleCCall(f, ms, ...args) {
	let types = [];
	let vals = [];

	for (let i = 0; i < args.length/2; i++)
		vals[i] = (types[i] = UTF8ToString(args[i*2])) == 'string' ?
			UTF8ToString(args[i*2+1]) : args[i*2+1];

	let func = UTF8ToString(f);
	setTimeout(function() { Module.ccall(func, null, types, vals) }, ms);
}

const POINT_CLASSES = [180, 140, 100, 60, 40, 20, 1, 0];
function drawVisit(visit_no, u_pts, u_rem, b_pts, b_rem, b_darts) {
	let elem = document.getElementById('match');

	for (let [i, ptr] of [u_pts, u_rem, visit_no, b_rem, b_pts, b_darts].entries()) {
		let div = document.createElement('div');
		let v = div.textContent = UTF8ToString(ptr);
		if (i == 0 || i == 4)
			div.className = `p${POINT_CLASSES.find(x => x <= v)}`;
		else if (i == 5 && v)
			div.textContent = `… ${v}`;
		div.className += ` visit-col${i+1}`;
		elem.append(div);
	}

	elem.scrollTop = elem.scrollHeight;
}

function setStdev(val) {
	Module.ccall('change_stdev', null, ['number', 'number'], [val, val]);
}

function updateStdev(val) {
	document.getElementById('stdev').value = val;
}

function setDelay(val) {
	Module.ccall('change_delay', null, ['number'], [val]);
}

function updateDelay(val) {
	document.getElementById('delay').value = val;
}

function processKey(data) {
	if (data.altKey || data.ctrlKey || data.metaKey || data.target.type == 'text')
		return;
	let key = data.key;

	if (isFinite(key))
		promptAppend(key);
	else if (key == 'Enter')
		promptSubmit();
	else if (key == 'Backspace')
		promptBackspace();
	else if (key == 'r')
		promptSubmitRem();
}

function modal(id) {
	document.getElementById(id).style.display = 'block';
}

window.onclick = function(e) {
	if (e.target.classList.contains('modal')) e.target.style.display = 'none';
}

document.addEventListener('keydown', processKey);