/r/livecounting on /r/place

OFFSET_X = 6;
OFFSET_Y = 361;

waitDuration = 0;
modHash = null;

//white: 0, lightGrey: 1, grey: 2, black: 3,
//pink: 4, red: 5, orange: 6, brown: 7,
//yellow: 8, lightGreen: 9, green: 10, cyan: 11,
//teal: 12, blue: 13, fuchsia: 14, purple: 15
f = -1;

image = [[10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10],
        [10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10],
        [10,0,0,3,0,0,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,0,0,3,0,0,0,0,0,0,0,0,0,10],
        [10,0,0,3,0,3,0,3,0,3,0,3,0,3,0,3,0,3,0,3,3,3,0,3,3,3,0,3,3,3,0,3,0,3,0,3,3,3,0,3,3,3,0,0,0,3,3,3,0,3,3,3,0,10],
                    [10,0,3,3,0,3,3,0,0,3,0,3,0,0,0,3,0,3,0,3,0,3,0,3,0,0,0,3,0,3,0,3,0,3,0,3,0,3,0,0,3,0,0,3,0,3,0,3,0,3,0,3,0,10],
                    [10,0,3,0,0,3,0,0,3,3,0,3,0,3,0,3,0,3,0,3,3,3,0,3,0,0,0,3,0,3,0,3,0,3,0,3,0,3,0,0,3,0,0,3,0,3,0,3,0,3,3,3,0,10],
                    [10,0,3,0,0,3,0,0,3,0,0,3,0,3,0,3,0,3,0,3,0,0,0,3,3,3,0,3,3,3,0,3,3,3,0,3,0,3,0,0,3,0,0,3,0,3,0,3,0,0,0,3,0,10],
                    [10,0,3,0,0,3,0,0,3,0,0,3,0,3,0,0,3,0,0,3,3,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,3,3,0,10],
        [10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10],


        [10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10]];


function start() {
    modHash = getModHash();
    main(0, 0);
}

function main(x, y) {
    var timer = drawIfNecessary(x, y);
    console.log('waiting ' + timer + ' milliseconds');
    x = (x + 1) % image[y].length;
    if (x === 0) {
        y = (y + 1) % image.length;
    }
    setTimeout(main, timer, x, y);
}

function drawIfNecessary(x, y) {
    if (image[y][x] < 0) return 0;
    canvasX = x + OFFSET_X;
    canvasY = y + OFFSET_Y;
    var pixelColour = pixelRequest(canvasX, canvasY);
    console.log('found pixel colour ' + pixelColour);
    var desiredColour = image[y][x];
    return (pixelColour == desiredColour) ? 0 : draw(canvasX, canvasY, desiredColour);
}


function sendSynchronousRequest(method, url, headers, params) {
    var xhr = new XMLHttpRequest();
    xhr.open(method, url, false);
    for (var h in headers) {
        xhr.setRequestHeader(h, headers[h]);
    }
    var firstParam = true;
    var paramString = '';
    for (var p in params) {
        if (firstParam) {
            firstParam = false;
        } else {
            paramString += '&';
        }
        paramString += p + '=' + params[p];
    }
    xhr.send(paramString);
    return xhr;
}


function getModHash() {
    var xhr = sendSynchronousRequest('GET', 'api/me.json', {}, {});

    if (xhr.readyState !== 4) throw 'oh shit';
    if (xhr.status !== 200) {
        alert("Couldn't obtain modhash. Are you logged into Reddit?");
        throw 'bollocks';
    }
    var response = JSON.parse(xhr.responseText);
    return response.data.modhash;
}


function pixelRequest(x, y) {
    var url = '/api/place/pixel.json?x=' + x + '&y=' + y;

    var xhr = sendSynchronousRequest('GET', url, {
        'x-requested-with': 'XMLHttpRequest',
        'x-modhash': modHash
    }, {});

    if (xhr.readyState !== 4) throw 'oh shit';
    if (xhr.status !== 200) {
        console.log(xhr);
        return "jews";
    }
    var response = JSON.parse(xhr.responseText);
    return response.color;
}


function draw(x, y, colour) {
    console.log('attempting to draw a pixel at (' + x + ',' + y + ')');
    var xhr = sendSynchronousRequest('POST', '/api/place/draw.json', {
        'Content-type': 'application/x-www-form-urlencoded; charset=UTF-8',
        'x-requested-with': 'XMLHttpRequest',
        'x-modhash': modHash
    }, {
        x: x,
        y: y,
        color: colour
    });

    if (xhr.readyState !== 4) throw 'oh shit';
    if (xhr.status !== 200 && xhr.status !== 429) {
        console.log(xhr);
        throw 'bollocks';
    }
    var response = JSON.parse(xhr.responseText);
    return response.wait_seconds * 1000;
}


start();