// ==UserScript==
// @name           ExSauce
// @namespace      hurfdurf
// @version        2.0
// @include        http://boards.4chan.org/*
// ==/UserScript==

// Original from http://pastebin.com/TTDJNH7c
// Modified by /a/nonymous
// Thanks to 4chan SS for helping me figure this shit out.
// No thanks to 4chan SS for making it hard by using jQuery!
// Works with the new 4chan HTML.

function addLinks(x) {
    setTimeout(function()
                {
                    var targets = x.querySelectorAll('a[class=fileThumb]');
                    for (var i=0;i<targets.length;i++)
                    {
                        var node = targets[i].previousSibling;
                        var a = document.createElement('a');
                        a.innerHTML = 'exhentai';
                        a.href = targets[i].href;
                        a.addEventListener('click',fetchImage,false);
                        node.appendChild(document.createTextNode(" "));
                        node.appendChild(a);
                    };
                }, 10);
}

function fetchImage(e) {
    if (e.which !== 1) return;
    e.preventDefault();
    var a = e.target;
    a.textContent = 'loading';
    GM_xmlhttpRequest(
                {
                    method: "GET",
                    url: a.href,
                    overrideMimeType: "text/plain; charset=x-user-defined",
                    headers: { "Content-Type": "image/jpeg" },
                    onload: function(x) { checkTitles(a, x.responseText); }
                });
}

function checkTitles(anchor,data) {
    var hash = sha1Hash(data_string(data));
    anchor.innerHTML = 'checking';
    var div = document.createElement('div');
    div.className = 'exPopup';
    div.id = 'ex' + hash;
    div.style.display = 'none';
    anchor.href = 'http://exhentai.org/?f_shash=' + hash + '&fs_similar=1&fs_exp=1';
    anchor.removeEventListener('click',fetchImage,false);
    document.body.appendChild(div);
    GM_xmlhttpRequest({
        method:'GET',
        url:anchor.href,
        onload:function(x) {

            var temp = document.createElement('div');
            temp.innerHTML = x.responseText;
            var results = temp.querySelectorAll('div.it3 > a:not([rel="nofollow"]), div.itd2 > a:not([rel="nofollow"])');
            var MAX = results.length;

            target = document.getElementById('ex' + hash);

            for (var i=0;i<MAX;i++) {
                target.appendChild(document.createTextNode(results[i].innerHTML));
                if (i<results.length-1) target.appendChild(document.createElement('br'));
            }
            anchor.innerHTML = 'found: ' + MAX;
            anchor.setAttribute('target','_blank');
            if (results.length) {
                anchor.addEventListener('mouseover',function(e) { document.getElementById('ex' + hash).style.display = null; },false);
                anchor.addEventListener('mousemove',function(e) { var target = document.getElementById('ex' + hash); target.style.left = (e.clientX+50) + 'px'; target.style.top = (e.clientY+10) + 'px'; },false);
                anchor.addEventListener('mouseout',function() { document.getElementById('ex' + hash).style.display = 'none'; },false);
            }
        }
    });
}

// ----------

function data_string(data) {
        var data_string='';
        for (var i=0,il=data.length;i<il;i++) data_string+=String.fromCharCode(data[i].charCodeAt(0)&0xff);
        return data_string;
}


function sha1Hash(msg) {
                var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];
                msg += String.fromCharCode(0x80);
                var l = msg.length/4 + 2;
                var N = Math.ceil(l/16);
                var M = new Array(N);
                for (var i = 0; i < N; i++)
                {
                    M[i] = new Array(16);
                    for (var j = 0; j < 16; j++)
                        M[i][j] = (msg.charCodeAt(i*64+j*4)<<24) | (msg.charCodeAt(i*64+j*4+1)<<16) |
                                  (msg.charCodeAt(i*64+j*4+2)<<8) | (msg.charCodeAt(i*64+j*4+3));
                }

                M[N-1][14] = ((msg.length-1)*8) / Math.pow(2, 32); M[N-1][14] = Math.floor(M[N-1][14])
                M[N-1][15] = ((msg.length-1)*8) & 0xffffffff;

                var H0 = 0x67452301;
                var H1 = 0xefcdab89;
                var H2 = 0x98badcfe;
                var H3 = 0x10325476;
                var H4 = 0xc3d2e1f0;

                var W = new Array(80);
                var a, b, c, d, e;
                for (var i = 0; i < N; i++)
                {
                    for (var t = 0; t < 16; t++)
                        W[t] = M[i][t];

                    for (var t = 16; t < 80; t++)
                        W[t] = ROTL(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);

                    a = H0;
                    b = H1;
                    c = H2;
                    d = H3;
                    e = H4;

                    for (var t = 0; t < 80; t++)
                    {
                        var s = Math.floor(t/20);
                        var T = (ROTL(a,5) + f(s,b,c,d) + e + K[s] + W[t]) & 0xffffffff;
                        e = d;
                        d = c;
                        c = ROTL(b, 30);
                        b = a;
                        a = T;
                    }

                    H0 = (H0+a) & 0xffffffff;
                    H1 = (H1+b) & 0xffffffff;
                    H2 = (H2+c) & 0xffffffff;
                    H3 = (H3+d) & 0xffffffff;
                    H4 = (H4+e) & 0xffffffff;
                }

                return H0.toHexStr() + H1.toHexStr() + H2.toHexStr() + H3.toHexStr() + H4.toHexStr();
}

function f(s, x, y, z) {
    switch (s) {
        case 0: return (x & y) ^ (~x & z);
        case 1: return x ^ y ^ z;
        case 2: return (x & y) ^ (x & z) ^ (y & z);
        case 3: return x ^ y ^ z;
    }
}

function ROTL(x, n) {
    return (x<<n) | (x>>>(32-n));
}

Number.prototype.toHexStr = function() {
    var s="", v;
    for (var i=7; i>=0; i--) { v = (this>>>(i*4)) & 0xf; s += v.toString(16); }
    return s;
}

// ----------


var style = document.createElement('style');
style.innerHTML = '.exPopup { position: fixed; background: white; padding: 5px; border: 1px black solid; color: black; }';
document.head.appendChild(style);

addLinks(document);
document.addEventListener('DOMNodeInserted',function(e) { if (e.target.nodeName == 'DIV') addLinks(e.target); },false);