// ==UserScript==
// @name          Neopets Auto Haggle
// @namespace     http://www.neofriends.net/
// @description   Auto haggle in main shops
// @include       http://neopets.com/haggle.phtml*
// @include       http://www.neopets.com/haggle.phtml*
// @include       www.neopets.com/haggle.phtml*
// @include       neopets.com/haggle.phtml*
// ==/UserScript==

function run_cap()
{
    if (document.location.href.match('haggle.phtml') && (document.body.innerHTML.indexOf('captcha_show.phtml') > -1))
    {
        if(document.body.innerHTML.indexOf("I wont take less than ") > -1)
        {
            start_pos = document.body.innerHTML.indexOf("I wont take less than ") + 22;
            end_pos = document.body.innerHTML.indexOf(" Neopoints for it");
            raw_price = document.body.innerHTML.substr(start_pos,end_pos-start_pos);
            raw_price = raw_price.replace(",","");

            document.body.innerHTML = document.body.innerHTML.replace("value=\"0\"","value=\""+haggle_price(raw_price)+"\"");
        }

        if(document.body.innerHTML.indexOf("I want at least ") > -1)
        {
            start_pos = document.body.innerHTML.indexOf("I want at least ") + 16;
            end_pos = document.body.innerHTML.indexOf(" Neopoints for this great item");
            raw_price = document.body.innerHTML.substr(start_pos,end_pos-start_pos);
            raw_price = raw_price.replace(",","");

            document.body.innerHTML = document.body.innerHTML.replace("value=\"0\"","value=\""+haggle_price(raw_price)+"\"");
        }

                const baseUrl = "http://www.neopets.com"
                var image = document.getElementsByTagName('input')[12].getAttribute("src");

                var newImg = new Image();
                var combined = new Image()
                combined.src = baseUrl + image;


	combined.onload = function(){

        newImg = combined;
                var canvas = document.createElement('canvas');
                canvas.width = newImg.width;
                canvas.height = newImg.height;

        console.log(newImg.width);
                var context = canvas.getContext("2d");

                context.drawImage(newImg, 0, 0);

                var image_data = context.getImageData(0, 0, newImg.width, newImg.height);
                var pix = image_data.data;

                var pixel = 0;
                var darkest_pixel_lightness = 100;
                var darkest_pixel_location = 0;

                for (var k = 0; k < pix.length; k += 4, pixel++)
                {
                    red = pix[k];
                    green = pix[k+1];
                    blue = pix[k+2];
                    alpha = pix[k+3];

                    if (alpha === 0) {
                        continue;
                    }

//                     console.log(Math.floor(pixel / canvas.width) + " ", k % canvas.width);

                    var hsl = rgbToHsl(red, green, blue);
                    var lightness = hsl.l;

                    if (lightness < darkest_pixel_lightness) {
                        darkest_pixel_lightness = lightness;
                        darkest_pixel_location = pixel;
                    }
                }

                var y = Math.floor(darkest_pixel_location / canvas.width);
                var x = darkest_pixel_location % canvas.width;
    }
    }
    alert('x: '+x+' y: '+y);
}

function rgbToHsl(r, g, b) {
    r /= 255, g /= 255, b /= 255;
    var max = Math.max(r, g, b),
        min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2;

    if (max == min) {
        h = s = 0;
    } else {
        var d = max - min;
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
        switch (max) {
            case r:
                h = (g - b) / d + (g < b ? 6 : 0);
                break;
            case g:
                h = (b - r) / d + 2;
                break;
            case b:
                h = (r - g) / d + 4;
                break;
        }
        h /= 6;
    }

    return ({
        h: h,
        s: s,
        l: l,
    });
}

function haggle_price(raw_price)
{
    var iVal = new Array(2);

    iVal[0] = raw_price.substr(0,1);
    iVal[1] = raw_price.substr(1,1);

    var x = 0;
    var end_price = "";

    for(x=0; x<raw_price.length; x++)
    {
        end_price += iVal[(x%2)];
    }

    return end_price;
}

window.addEventListener('load', run_cap, false);