function setupEventHandler() {
    let stones = document.getElementsByClassName('go-stone-empty');
    let inputRow = document.getElementById('go-input-row');
    let inputCol = document.getElementById('go-input-col');
    let inputPlace = document.getElementById('go-input-place');
    
    for (let i = 0; i < stones.length; ++i) {
	stones[i].onclick = (e) => {
	    console.log('place');
	    inputCol.value = stones[i].attributes['data-col'].value;
	    inputRow.value = stones[i].attributes['data-row'].value;
	    inputPlace.click();
	};
    }
}

let updateInterval = null;
if (document.getElementsByClassName('go-territory').length == 0) {
    setInterval(update, 500);
}

function update() {
    var req = new XMLHttpRequest();
    req.addEventListener('load', (ev) => {
        let parser = new DOMParser();
        let doc = parser.parseFromString(req.responseText, 'text/html');
	let currentField = document.querySelector('svg');
	let newField = doc.querySelector('svg');
        let currentStones = currentField.getElementsByClassName('go-stone');
        let newStones = newField.getElementsByClassName('go-stone');
        let newTerritory = doc.getElementsByClassName('go-territory');
	let currentInfo = document.getElementById('gameinfo');	
	let newInfo = doc.getElementById('gameinfo');
	if (newTerritory.length > 0) {
	    window.location.reload();
	    return;
	}
	for (let i = 0; i < currentStones.length; ++i) {
	    if (doc.getElementById(currentStones[i].id) === null) {
		currentStones[i].remove();
	    }
	}
	if (currentInfo.classList[0] != newInfo.classList[0]) {
	    console.log(newInfo.classList[0]);
	    currentInfo.innerHTML = newInfo.innerHTML;
	    currentInfo.classList.remove(currentInfo.classList[0]);
	    currentInfo.classList.add(newInfo.classList[0]);
	}
	for (let i = 0; i < newStones.length; ++i) {
	    if (document.getElementById(newStones[i].id) === null) {
		currentField.append(newStones[i]);
	    }
	}
	
	setupEventHandler();
    });
    req.open('GET', window.location.href);
    req.send();
}

setupEventHandler();