var drag;
var drop;
var xhr = new XMLHttpRequest();
//xhr.open('GET', 'data/move.json', true);

for (b=0; C('coord').length > b; b++) {C('coord')[b].onmousedown = function () {
event.preventDefault();
//drop = null;
drag = this.id;
}}

for (b=0; C('coord').length > b; b++) {C('coord')[b].onmouseup = function () {
drop = this.id;
//if (drop !== undefined && drag !== undefined) {console.log(drag + ' -> ' + drop)}
//if (drop !== undefined && drop !== null && drag !== undefined && drag !== null) { //console.log(this);
if (drop.length === 3 && drag.length === 3) { //console.log(this);
xhr.open('GET', 'move/' + drag + '/' + drop , true);
//xhr.send(drag + ',' + drop);
xhr.send(null);
xhr.onload = function () {
if (xhr.status === 200) {
responseObject = JSON.parse(xhr.responseText);
if (responseObject.w.status.length === 1 || responseObject.w.status[1] !== 0) {
I(drag).setAttribute('src', 'i/' + responseObject.w.src[0] + '.png');
I(drop).setAttribute('src', 'i/' + responseObject.w.src[1] + '.png');
I(drag).id = responseObject.w.src[0];
I(drop).id = responseObject.w.src[1];

// TODO: Display status and/or sleep.
I('title').innerHTML = responseObject.b.src[1] + ' moves from ' + responseObject.b.src[0] + ' to ' + responseObject.b.dst[0];
if (responseObject.b.dst.length === 2) {I('title').innerHTML += ' and takes ' + responseObject.b.dst[1]}
I('description').innerHTML = 'Turn ' + responseObject.w.status.length + ' of white.';
//I('title').innerHTML = responseObject.b.status[0];
//I('description').innerHTML = responseObject.b.status[1];

I(responseObject.b.src[1]).setAttribute('src', 'i/' + responseObject.b.src[0] + '.png');
I(responseObject.b.dst[responseObject.b.dst.length-1]).setAttribute('src', 'i/' + responseObject.b.src[1] + '.png');
I(responseObject.b.src[1]).id = responseObject.b.src[0];
I(responseObject.b.dst[responseObject.b.dst.length-1]).id = responseObject.b.src[1];
}
}
};
}
//drag = null;
}}

//for (b=0; C('coord').length > b; b++) {C('coord')[b].onmousemove = function () {
//if (drag !== null && drag !== undefined) {console.log(this.x + '.' + this.y)}
//if (drag !== null && drag !== undefined) {I(this.id).style.position = 'absolute'; I(this.id).style.left = this.x + 'px'; I(this.id).style.up = this.y + 'px'}
//}}