// ==UserScript==
// @name       Manga Loader
// @namespace  http://www.fuzetsu.com/MangaLoader
// @version    1.5.11
// @description  Loads manga chapter into one page in a long strip format, supports switching chapters and works for a variety of sites, minimal script with no dependencies, easy to implement new sites
// @copyright  2014+, fuzetsu
// @noframes
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_deleteValue
// @grant GM_registerMenuCommand
// @match http://bato.to/read/*
// @match http://mangafox.me/manga/*/*/*
// @match http://readms.com/r/*/*/*/*
// @match http://mangastream.com/read/*/*/*/*
// @match http://g.e-hentai.org/s/*/*
// @match http://exhentai.org/s/*/*
// @match *://www.fakku.net/*/*/read*
// @match http://www.mangareader.net/*/*
// @match http://www.mangahere.co/manga/*/*
// @match http://www.mangapanda.com/*/*
// @match http://mangadeer.com/manga/*/*/*/*
// @match http://mangacow.co/*/*
// @match http://nowshelf.com/watch/*
// @match http://nhentai.net/g/*/*
// @match http://centraldemangas.net/online/*/*
// @match http://narutomanga.com.br/leitura/online/capitulo/*
// @match http://bleachmanga.com.br/leitura/online/capitulo/*
// @match http://www.mangatown.com/manga/*/*/*
// @match http://manga-joy.com/*/*
// @match http://*.dm5.com/m*
// @match http://raw.senmanga.com/*/*/*
// @match http://www.japscan.com/lecture-en-ligne/*
// @match http://www.pecintakomik.com/manga/*/*
// @match http://dynasty-scans.com/chapters/*
// @match http://www.onemanga.me/*/*
// @match http://www.onemanga2.com/*/*
// @match http://mangawall.com/manga/*/*
// @match http://manga.animea.net/*
// @match http://kissmanga.com/Manga/*/*
// @match http://view.thespectrum.net/series/*
// @match http://manhua.dmzj.com/*/*
// @match http://www.8muses.com/picture/*/category/*
// @match http://hqbr.com.br/hqs/*/capitulo/*/leitor/0
// @match http://www.dmzj.com/view/*/*
// @match http://mangaindo.co/*/*
// @match *://hitomi.la/reader/*
// @downloadURL none
// ==/UserScript==

// set to true for manga load without prompt
var BM_MODE = false;

// short reference to unsafeWindow (or window if unsafeWindow is unavailable e.g. bookmarklet)
var W = (typeof unsafeWindow === 'undefined') ? window : unsafeWindow;

var scriptName = 'Manga Loader';
var pageTitle = document.title;

var IMAGES = {
  refresh_large: '//rgeorgeeb-tilebuttongenerator.googlecode.com/hg-history/c35993682c2d50149976fd7a1f302f8c01a88716/asset-studio/src/res/clipart/icons/refresh.svg',
  refresh_small: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAQAAAC1+jfqAAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAAJiS0dEAP+Hj8y/AAAACXBIWXMAAABIAAAASABGyWs+AAABSklEQVQozz3PsUvUYRzH8dfz/d2JNYRNJ0dwgxCXNUUSFFxLQVNB1NR/0FJBIYRrEA02FQ5NkQiCJkFtDQ3hUmBDUuDSJhJBJkd093ueBi8/f8D7836nOUiSrOWxGw6DQIaqBxRXvXBRsaVh119FKISQTFmyZlo2ZslH3zzSkcU+qkg6/m+ocsys987IImRsOeeen0LfedetoGPNlLzvEIp1b3Udd8sXy/ZccsRRr6pe0kDRsG3Rjk218MEJJ7W8CcVQPfquPfVbLQnPMWk6tF0zg1CjGkVn234oqnDBinkkUI9akqamJIXv9pxyWq15kBqKsyYM7IYNn014aMxAU6g0DUy6rdi0HvrmcdmiloGsNtD1Uley4FeaC9kTd/DVaxsOmXFFG8tuyg1FclfffV3dA4s/nnlgKFU9kvDOJ+PaxhU7Vs1aUEvKP5CJao7EBtfGAAAAJXRFWHRkYXRlOmNyZWF0ZQAyMDE1LTAxLTI5VDIyOjExOjI1LTA1OjAwsbFIowAAACV0RVh0ZGF0ZTptb2RpZnkAMjAxNS0wMS0yOVQyMjoxMToyNS0wNTowMMDs8B8AAAAASUVORK5CYII='
};

/**
Sample Implementation:
{
    match: "http://domain.com/.*" // the url to react to for manga loading
  , img: '#image' // css selector to get the page's manga image
  , next: '#next_page' // css selector to get the link to the next page
  , numpages: '#page_select' // css selector to get the number of pages. elements like (select, span, etc)
  , curpage: '#page_select' // css selector to get the current page. usually the same as numPages if it's a select element
  , nextchap: '#next_chap' // css selector to get the link to the next chapter
  , prevchap: '#prev_chap' // same as above except for previous
  , wait: 3000 // how many ms to wait before auto loading (to wait for elements to load)
  , pages: function(next_url, current_page_number, callback, extract_function) {
    // gets called requesting a certain page number (current_page_number)
    // to continue loading execute callback with img to append as first parameter and next url as second parameter
    // only really needs to be used on sites that have really unusual ways of loading images or depend on javascript
  }

  Any of the CSS selectors can be functions instead that return the desired value.
}
*/

var implementations = [{ // Batoto
  match: "^http://bato.to/read/.*",
  img: '#comic_page',
  next: '#full_image + div > a',
  numpages: '#page_select',
  curpage: '#page_select',
  nextchap: 'select[name=chapter_select]',
  prevchap: 'select[name=chapter_select]',
  invchap: true
}, { // MangaPanda
  match: "^http://www.mangapanda.com/.*/[0-9]*",
  img: '#img',
  next: '.next a',
  numpages: '#pageMenu',
  curpage: '#pageMenu',
  nextchap: 'td.c5 + td a',
  prevchap: 'table.c6 tr:last-child td:last-child a'
}, { // MangaFox
  match: "^http://mangafox.me/manga/[^/]*/[^/]*/[^/]*",
  img: '#image',
  next: 'a.next_page',
  numpages: function() {
    return extractInfo('select.m') - 1;
  },
  curpage: 'select.m',
  nextchap: '#chnav p + p a',
  prevchap: '#chnav a'
}, { // MangaStream
  match: "^http://(readms|mangastream).com/(r|read)/[^/]*/[^/]*/[^/]*",
  img: '#manga-page',
  next: '.next a',
  numpages: function() {
    var lastPage = getEl('.subnav-wrapper .controls .btn-group:last-child ul li:last-child');
    return parseInt(lastPage.textContent.match(/[0-9]/g).join(''), 10);
  },
  nextchap: function(prev) {
    var found;
    var chapters = [].slice.call(document.querySelectorAll('.controls > div:first-child > .dropdown-menu > li a'));
    chapters.pop();
    for (var i = 0; i < chapters.length; i++) {
      if (window.location.href.indexOf(chapters[i].href) !== -1) {
        found = chapters[i + (prev ? 1 : -1)];
        if (found) return found.href;
      }
    }
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // MangaReader
  match: "^http://www.mangareader.net/.*/.*",
  img: '#img',
  next: '.next a',
  numpages: '#pageMenu',
  curpage: '#pageMenu',
  nextchap: 'td.c5 + td a',
  prevchap: 'table.c6 tr:last-child td:last-child a'
}, { // MangaTown
  match: "^http://www.mangatown.com/manga/[^/]*/v[0-9]*/c[0-9]*",
  img: '#image',
  next: '#viewer a',
  numpages: '.page_select select',
  curpage: '.page_select select',
  nextchap: '#top_chapter_list',
  prevchap: '#top_chapter_list',
  wait: 1000
}, { // MangaCow
  match: "^http://mangacow\\.co/.*/[0-9]*",
  img: '.prw > a > img',
  next: '.prw > a:last-child',
  numpages: 'select.cbo_wpm_pag',
  curpage: 'select.cbo_wpm_pag',
  nextchap: function(prev) {
    var chapSel = getEl('select.cbo_wpm_chp');
    var nextChap = chapSel.options[chapSel.selectedIndex + (prev ? 1 : -1)];
    if (nextChap) {
      return 'http://mangacow.co/' + window.location.pathname.slice(1, window.location.pathname.slice(1).indexOf('/') + 2) + nextChap.value;
    }
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // MangaHere
  match: "^http://www.mangahere.co/manga/.*/.*",
  img: '#viewer img',
  next: '#viewer a',
  numpages: 'select.wid60',
  curpage: 'select.wid60',
  nextchap: function(prev) {
    var chapter = W.chapter_list[W.current_chapter_index + (prev ? -1 : 1)];
    return chapter && chapter[1];
  },
  prevchap: function() {
    return this.nextchap(true);
  },
  wait: function() {
    return areDefined(W.current_chapter_index, W.chapter_list);
  }
}, { // MangaDeer
  match: "^http://mangadeer\\.com/manga/.*",
  img: '.img-link > img',
  next: '.page > span:last-child > a',
  numpages: '#sel_page_1',
  curpage: '#sel_page_1',
  nextchap: function(prev) {
    var ddl = getEl('#sel_book_1');
    var index = ddl.selectedIndex + (prev ? -1 : 1);
    if (index >= ddl.options.length) return;
    var mangaName = window.location.href.slice(window.location.href.indexOf('manga/') + 6);
    mangaName = mangaName.slice(0, mangaName.indexOf('/'));
    return 'http://mangadeer.com/manga/' + mangaName + ddl.options[index].value + '/1';
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // Central de Mangas
  match: "^http://(centraldemangas\\.net|(bleachmanga|narutomanga)\\.com\\.br/leitura)/online/[^/]*/[0-9]*",
  img: '#manga-page',
  next: '#manga-page',
  numpages: '#manga_pages',
  curpage: '#manga_pages',
  nextchap: function(prev) {
    var url = window.location.href,
      chapters = getEl('#manga_caps'),
      urlPre = url.slice(0, url.lastIndexOf('/') + 1),
      newChap = chapters.options[chapters.selectedIndex + (prev ? -1 : 1)];
    return newChap ? urlPre + newChap.textContent : null;
  },
  prevchap: function() {
    return this.nextchap(true);
  },
  pages: function(url, num, cb, ex) {
    var url = url.slice(0, url.lastIndexOf('-') + 1) + ("0" + num).slice(-2) + url.slice(url.lastIndexOf('.'));
    cb(url, url);
  }
}, { // Manga Joy
  match: "^http://manga-joy.com/[^/]*/[0-9]*",
  img: '.prw img',
  next: '.nxt',
  numpages: '.wpm_nav_rdr li:nth-child(3) > select',
  curpage: '.wpm_nav_rdr li:nth-child(3) > select',
  nextchap: function(prev) {
    var chapter = extractInfo('.wpm_nav_rdr li:nth-child(2) > select', {
      type: 'value',
      val: prev ? 1 : -1
    });
    if (chapter) {
      var urlParts = window.location.href.slice(7).split('/');
      while (urlParts.length > 2) urlParts.pop();
      return 'http://' + urlParts.join('/') + '/' + chapter;
    }
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // GEH/EXH
  match: "^http://(g.e-hentai|exhentai).org/s/.*/.*",
  img: '.sni > a > img, #img',
  next: '.sni > a, #i3 a',
  numpages: 'body > div > div:nth-child(2) > div > span:nth-child(2)',
  curpage: 'body > div > div:nth-child(2) > div > span:nth-child(1)'
}, { // Fakku
  match: "^http(s)?://www.fakku.net/.*/.*/read",
  img: '.current-page',
  next: '.current-page',
  numpages: '.drop',
  curpage: '.drop',
  pages: function(url, num, cb, ex) {
    var firstNum = url.lastIndexOf('/'),
      lastDot = url.lastIndexOf('.');
    var c = url.charAt(firstNum);
    while (c && !/[0-9]/.test(c)) {
      c = url.charAt(++firstNum);
    }
    var curPage = parseInt(url.slice(firstNum, lastDot), 10);
    var url = url.slice(0, firstNum) + ('00' + (curPage + 1)).slice(-3) + url.slice(lastDot);
    cb(url, url);
  }
}, { // Nowshelf
  match: "^http://nowshelf.com/watch/[0-9]*",
  img: '#image',
  next: '#image',
  numpages: function() {
    return parseInt(getEl('#page').textContent.slice(3), 10);
  },
  curpage: function() {
    return parseInt(getEl('#page > input').value, 10);
  },
  pages: function(url, num, cb, ex) {
    var url = url.slice(0, -7) + ('00' + num).slice(-3) + url.slice(-4);
    cb(url, url);
  }
}, { // nhentai
  match: "^http://nhentai\\.net\\/g\\/[0-9]*/[0-9]*",
  img: '#image-container > a > img',
  next: '#image-container > a > img',
  numpages: '.num-pages',
  curpage: '.current',
  pages: function(url, num, cb, ex) {
    url = url.replace(/\/[^\/]*$/, '/') + num;
    cb(url, url);
  }
}, { // dm5
  match: "^http://[^\\.]*\\.dm5\\.com/m[0-9]*",
  img: '#cp_image',
  next: '#cp_image',
  numpages: '#pagelist',
  curpage: '#pagelist',
  pages: function(url, num, cb, ex) {
    var cid = window.location.href.match(/m[0-9]*/g)[2].slice(1),
      xhr = new XMLHttpRequest();
    xhr.open('get', 'chapterfun.ashx?cid=' + cid + '&page=' + num);
    xhr.onload = function() {
      var images = eval(xhr.responseText);
      cb(images[0], images[0]);
    };
    xhr.send();
  }
}, { // Senmanga
  match: "^http://raw\\.senmanga\\.com/[^/]*/[^/]*/[0-9]*",
  img: '#picture',
  next: '#omv > table > tbody > tr:nth-child(2) > td > a',
  numpages: 'select[name=page]',
  curpage: 'select[name=page]',
  nextchap: function(prev) {
    var next = extractInfo('select[name=chapter]', {type: 'value', val: (prev ? 1 : -1)});
    if(next) return window.location.href.replace(/\/[^\/]*\/[0-9]+\/?$/, '') + '/' + next + '/1';
  },
  prevchap: function() {
    return this.nextchap(true);
  },
  pages: function(url, num, cb, ex) {
	cb(W.new_image.replace(/page=[0-9]+&/, 'page=' + num + '&'), num);
  }
}, { // japscan
  match: "^http://www\\.japscan\\.com/lecture-en-ligne/[^/]*/[0-9]*",
  img: '#imgscan',
  next: '#next_link',
  numpages: '#pages',
  curpage: '#pages',
  nextchap: '#next_chapter',
  prevchap: '#back_chapter'
}, { // pecintakomik
  match: "^http://www\\.pecintakomik\\.com/manga/[^/]*/[^/]*",
  img: '.picture',
  next: '.pager a:nth-child(3)',
  numpages: 'select[name=page]',
  curpage: 'select[name=page]',
  nextchap: function(prev) {
    var chapters = getEl('select[name=chapter]'),
      chapter = chapters.options[chapters.selectedIndex + (prev ? 1 : -1)];
    if (chapter) {
      return window.location.href.replace(/\/([^\/]+)\/[0-9]+\/?$/, '/$1/' + chapter.value);
    }
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // dynasty-scans
  match: "^http://dynasty-scans.com/chapters/.*",
  img: '#image > img',
  next: '#image > img',
  numpages: function() {
    return W.pages.length;
  },
  curpage: function() {
    return parseInt(getEl('#image > div.pages-list > a.page.active').textContent);
  },
  nextchap: '#next_link',
  prevchap: '#prev_link',
  pages: function(url, num, cb, ex) {
    url = W.pages[num - 1].image;
    cb(url, url);
  }
}, { // OneManga
  match: "^http://www\\.onemanga(2)?\\.(me|com)/[^/]*/[0-9]*",
  img: 'img.manga-page',
  next: '.nav_pag > li:nth-child(1) > a',
  numpages: 'select.cbo_wpm_pag',
  curpage: 'select.cbo_wpm_pag',
  nextchap: function(prev) {
    var curChap = parseInt(extractInfo('select.cbo_wpm_chp', {type: 'value'})),
        targetChap = curChap + (prev ? -1 : 1);
    return window.location.href.replace(/\/[0-9]*(\/[0-9]*\/?)?$/, '/' + targetChap);
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // MangaWall
  _page: null,
  match: "^http://mangawall\\.com/manga/[^/]*/[0-9]*",
  img: 'img.scan',
  next: function() {
    if(this._page === null) this._page = W.page;
    return W.series_url + '/' + W.chapter + '/' + (this._page += 1);
  },
  numpages: '.pageselect',
  curpage: '.pageselect',
  nextchap: function(prev) {
    return W.series_url + '/' + (parseInt(W.chapter.slice(1)) + (prev ? -1 : 1)) + '/1';
  },
  prevchap: function() {
  	return this.nextchap(true);
  }
}, { // Manga AnimeA
  _page: null,
  match: "^http://manga\\.animea.net/.*chapter-[0-9]*-page-[0-9]*.html",
  img: '#scanmr',
  next: function() {
    if(this._page === null) this._page = W.page;
    return W.series_url + W.chapter + '-page-' + (this._page += 1) + '.html';
  },
  numpages: '.pageselect',
  curpage: '.pageselect',
  nextchap: function(prev) {
    return W.series_url + 'chapter-' + (parseInt(W.chapter.match(/[0-9]+/)[0]) + (prev ? -1 : 1)) + '-page-1.html';
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // Kissmanga
  match: "^http://kissmanga\\.com/Manga/[^/]*/.+",
  img: '#imgCurrent',
  next: '#imgCurrent',
  numpages: function() {
    return W.lstImages.length;
  },
  curpage: function() {
    return W.currImage + 1;
  },
  nextchap: '#selectChapter',
  prevchap: '#selectChapter',
  pages: function(url, num, cb, ex) {
    cb(W.lstImages[num - 1], num);
  }
}, { // the spectrum scans
  match: "^http://view\\.thespectrum\\.net/series/[^\\.]+\\.html\\?ch=[^&]*&page=[0-9]+",
  img: '#mainimage',
  next: '#mainimage',
  numpages: '.selectpage',
  curpage: '.selectpage',
  nextchap: function(prev) {
    var next = extractInfo('.selectchapter', {type: 'value', val: prev ? -1 : 1});
    if(next) {
      return window.location.href.replace(/ch=.+/, 'ch=' + next + '&page=1');
    }
  },
  prevchap: function() {
    return this.nextchap(true);
  },
  pages: function(url, num, cb, ex) {
    url = url.replace(/[^\.\/]+\.([a-z]+)$/, ('00' + num).slice(-3) + '.$1'); 
    cb(url, url);
  }
}, { // manhua.dmzj.com
  match: "http://manhua.dmzj.com/[^/]*/[0-9]+(-[0-9]+)?\\.shtml",
  img: '.pic_link',
  next: '.pic_link',
  numpages: function() {
    return W.arr_pages.length;
  },
  curpage: function() {
    return W.COMIC_PAGE.getPageNumber();
  },
  nextchap: '#next_chapter',
  prevchap: '#prev_chapter',
  pages: function(url, num, cb, ex) {
    cb(W.img_prefix + W.arr_pages[num - 1], num);
  }
}, { // 8muses
  match: "http://www.8muses.com/picture/[^/]+/category/.+",
  img: '.image',
  next: '.imgLiquidFill > a'
}, { // hqbr.com.br
  match: "http://hqbr.com.br/hqs/[^/]+/capitulo/[0-9]+/leitor/0",
  img: '#hq-page',
  next: '#hq-page',
  numpages: function() {
    return W.pages.length;
  },
  curpage: function() {
    return W.paginaAtual + 1;
  },
  nextchap: function(prev) {
    var chapters = getEls('#chapter-dropdown a'),
        current = parseInt(W.capituloIndex),
        chapter = chapters[current + (prev ? -1 : 1)];
    return chapter && chapter.href;
  },
  prevchap: function() {
    return this.nextchap(true);
  },
  pages: function(url, num, cb, ex) {
    cb(W.pages[num - 1], num);
  }
}, { // www.dmzj.com
  match: "http://www.dmzj.com/view/[^/]+/.+\\.html",
  img: '#pic',
  next: '#pic',
  numpages: '.select_jump',
  curpage: '.select_jump',
  nextchap: '.next > a',
  prevchap: '.pre > a',
  pages: function(url, num, cb, ex) {
    cb('http://images.dmzj.com/' + W.pic[num - 1], num);
  },
  wait: 1000
}, { // mangaindo.co
  match: "http://mangaindo.co/[^/]+/[0-9]+",
  img: '.prw > a > img',
  next: '.prw > a',
  numpages: '.cbo_wpm_pag',
  curpage: '.cbo_wpm_pag',
  nextchap: function(prev) {
    var chapter = extractInfo('.cbo_wpm_chp', { type: 'value', val: (prev ? 1 : -1) });
    if(chapter) return W.location.origin + '/' + W.location.pathname.slice(1).split('/').shift() + '/' + chapter + '/1';
  },
  prevchap: function() {
    return this.nextchap(true);
  }
}, { // hitomi.la
  match: "http(s)?://hitomi.la/reader/[0-9]+.html",
  img: '#comicImages > img',
  next: '#comicImages > img',
  numpages: function() {
	return W.images.length;
  },
  curpage: function() {
	return parseInt(W.curPanel);
  },
  pages: function(url, num, cb, ex) {
	cb(W.images[num - 1].path, num);
  }
}];

var log = function(msg, type) {
  type = type || 'log';
  if (type === 'exit') {
    throw scriptName + ' exit: ' + msg;
  } else {
    console[type](scriptName + ' ' + type + ': ', msg);
  }
};

var getEl = function(q, c) {
  if (!q) return;
  return (c || document).querySelector(q);
};

var getEls = function(q, c) {
  return [].slice.call((c || document).querySelectorAll(q));
};

var storeGet = function(key) {
  if (typeof GM_getValue === "undefined") {
    var value = localStorage.getItem(key);
    if (value === "true" || value === "false") {
      return (value === "true") ? true : false;
    }
    return value;
  }
  return GM_getValue(key);
};

var storeSet = function(key, value) {
  if (typeof GM_setValue === "undefined") {
    return localStorage.setItem(key, value);
  }
  return GM_setValue(key, value);
};

var storeDel = function(key) {
  if (typeof GM_deleteValue === "undefined") {
    return localStorage.removeItem(key);
  }
  return GM_deleteValue(key);
};

var areDefined = function() {
  return [].every.call(arguments, function(arg) {
    return arg !== undefined && arg !== null;
  });
};

var extractInfo = function(selector, mod, context) {
  selector = this[selector] || selector;
  if (typeof selector === 'function') {
    return selector.call(this);
  }
  var elem = getEl(selector, context),
    option;
  mod = mod || {};
  if (elem) {
    switch (elem.nodeName.toLowerCase()) {
      case 'img':
        return (mod.altProp && elem.getAttribute(mod.altProp)) || elem.src || elem.getAttribute('src');
      case 'a':
        return elem.href || elem.getAttribute('href');
      case 'ul':
        return elem.children.length;
      case 'select':
        switch (mod.type) {
          case 'index':
            return elem.options.selectedIndex + 1;
          case 'value':
            option = elem.options[elem.options.selectedIndex + (mod.val || 0)] || {};
            return option.value;
          default:
            return elem.options.length;
        }
        break;
      default:
        switch (mod.type) {
          case 'index':
            return parseInt(elem.textContent);
          default:
            return elem.textContent;
        }
    }
  }
};

var addStyle = function() {
  if (!this.MLStyle) {
    this.MLStyle = document.createElement('style');
    this.MLStyle.dataset.name = 'ml-style';
    document.head.appendChild(this.MLStyle);
  }
  this.MLStyle.textContent += [].join.call(arguments, '\n');
};

var toStyleStr = function(obj, selector) {
  var stack = [],
    key;
  for (key in obj) {
    if (obj.hasOwnProperty(key)) {
      stack.push(key + ':' + obj[key]);
    }
  }
  if (selector) {
    return selector + '{' + stack.join(';') + '}';
  } else {
    return stack.join(';');
  }
};

var throttle = function(callback, limit) {
  var wait = false;
  return function() {
    if (!wait) {
      callback();
      wait = true;
      setTimeout(function() {
        wait = false;
      }, limit);
    }
  };
};

var createButton = function(text, action, styleStr) {
  var button = document.createElement('button');
  button.textContent = text;
  button.onclick = action;
  button.setAttribute('style', styleStr || '');
  return button;
};

var getViewer = function(prevChapter, nextChapter) {
  var viewerCss = toStyleStr({
      'background-color': 'black',
      'font': '0.813em courier',
      'text-align': 'center',
    }, 'body'),
    imagesCss = toStyleStr({
      'margin-top': '10px',
      'margin-bottom': '10px'
    }, '.ml-images'),
    imageCss = toStyleStr({
      'max-width': '100%',
      'display': 'block',
      'margin': '3px auto'
    }, '.ml-images img'),
    counterCss = toStyleStr({
      'background-color': '#222',
      'color': 'white',
      'border-radius': '10px',
      'width': '30px',
      'margin-left': 'auto',
      'margin-right': 'auto',
      'margin-top': '-12px',
      'padding-left': '5px',
      'padding-right': '5px',
      'border': '1px solid white',
      'z-index': '100',
      'position': 'relative'
    }, '.ml-counter'),
    navCss = toStyleStr({
      'text-decoration': 'none',
      'color': 'white',
      'background-color': '#444',
      'padding': '3px 10px',
      'border-radius': '5px',
      'transition': '250ms'
    }, '.ml-chap-nav a'),
    navHoverCss = toStyleStr({
      'background-color': '#555'
    }, '.ml-chap-nav a:hover'),
    boxCss = toStyleStr({
      'position': 'fixed',
      'background-color': '#222',
      'color': 'white',
      'padding': '7px',
      'border-top-left-radius': '5px',
      'cursor': 'default'
    }, '.ml-box'),
    statsCss = toStyleStr({
      'bottom': '0',
      'right': '0',
      'opacity': '0.4',
      'transition': '250ms'
    }, '.ml-stats'),
    statsCollapseCss = toStyleStr({
      'color': 'orange',
      'cursor': 'pointer'
    }, '.ml-stats-collapse'),
    statsHoverCss = toStyleStr({
      'opacity': '1'
    }, '.ml-stats:hover'),
    manualReloadCss = toStyleStr({
      'cursor': 'pointer',
      'vertical-align': 'middle'
    }, '.ml-manual-reload'),
    floatingMsgCss = toStyleStr({
      'bottom': '50px',
      'right': '0',
      'border-bottom-left-radius': '5px'
    }, '.ml-floating-msg');
  // clear all styles and scripts
  var title = document.title;
  document.head.innerHTML = '<meta name="viewport" content="width=device-width, initial-scale=1">';
  document.title = title;
  // navigation
  var nav = '<div class="ml-chap-nav">' + (prevChapter ? '<a href="' + prevChapter + '">Prev Chapter</a> ' : '') +
    (storeGet('mAutoload') ? '' : '<a href="" data-ignore="true">Exit</a> ') +
    (nextChapter ? '<a href="' + nextChapter + '">Next Chapter</a>' : '') + '</div>';
  // message area
  var floatingMsg = '<div class="ml-box ml-floating-msg"></div>';
  // stats
  var stats = '<div class="ml-box ml-stats"><span title="hide stats" class="ml-stats-collapse">&gt;&gt;</span><span class="ml-stats-content"><span class="ml-stats-pages"></span> <img class="ml-manual-reload" title="Manually refresh next clicked image." src="' + IMAGES.refresh_small + '" /></span></div>';
  // combine ui elements
  document.body.innerHTML = nav + '<div class="ml-images"></div>' + nav + floatingMsg + stats;
  // add all styles to the page
  addStyle(viewerCss, imagesCss, imageCss, counterCss, navCss, navHoverCss, statsCss, statsCollapseCss, statsHoverCss, manualReloadCss, boxCss, floatingMsgCss);
  // set up return UI object
  var UI = {
    images: getEl('.ml-images'),
    statsContent: getEl('.ml-stats-content'),
    statsPages: getEl('.ml-stats-pages'),
    statsCollapse: getEl('.ml-stats-collapse'),
    btnManualReload: getEl('.ml-manual-reload'),
    floatingMsg: getEl('.ml-floating-msg')
  };
  // message func
  var messageId = null;
  var showFloatingMsg = function(msg, timeout) {
    clearTimeout(messageId);
    log(msg);
    UI.floatingMsg.textContent = msg;
    UI.floatingMsg.style.display = msg ? '' : 'none';
    if(timeout) {
      messageId = setTimeout(function() {
        showFloatingMsg('');
      }, timeout);
    }
  };
  // configure initial state
  UI.floatingMsg.style.display = 'none';
  // set up listeners
  document.addEventListener('click', function(evt) {
    if (evt.target.nodeName === 'A' && !evt.target.dataset.ignore && evt.target.parentNode.className.indexOf('ml-chap-nav') !== -1) {
      log('next chapter will autoload');
      storeSet('autoload', 'yes');
    }
  }, false);
  UI.btnManualReload.addEventListener('click', function(evt) {
    var imgClick = function(e) {
      var target = e.target;
      UI.images.removeEventListener('click', imgClick, false);
      UI.images.style.cursor = '';
      if(target.nodeName === 'IMG' && target.parentNode.className === 'ml-images') {
        showFloatingMsg('');
        if(!target.title) {
          showFloatingMsg('Reloading "' + target.src + '"', 3000);
          if(target.complete) target.onload = null;
          target.src = target.src + (target.src.indexOf('?') !== -1 ? '&' : '?') + new Date().getTime();
        }
      } else {
        showFloatingMsg('Cancelled manual reload...', 3000);
      }
    };
    showFloatingMsg('Left click the image you would like to reload. Click on the page margin to cancel.');
    UI.images.style.cursor = 'pointer';
    UI.images.addEventListener('click', imgClick, false);
  }, false);
  UI.statsCollapse.addEventListener('click', function(evt) {
    var test = UI.statsCollapse.textContent === '>>';
    UI.statsContent.style.display = test ? 'none' : '';
    UI.statsCollapse.textContent = test ? '<<' : '>>';
  }, false);
  return UI;
};

var getCounter = function(imgNum) {
  var counter = document.createElement('div');
  counter.classList.add('ml-counter');
  counter.textContent = imgNum;
  return counter;
};

var addImage = function(src, loc, imgNum, callback) {
  if(!src) return;
  var image = new Image(),
      counter = getCounter(imgNum);
  image.onerror = function() {
    log('failed to load ' + src);
    image.onload = null;
    image.style.backgroundColor = 'white';
    image.title = 'Reload?';
    image.src = IMAGES.refresh_large;
    image.onclick = function() {
      image.onload = callback;
      image.title = '';
      image.src = src;
    };
  };
  image.onload = callback;
  image.src = src;
  loc.appendChild(image);
  loc.appendChild(counter);
};

var loadManga = function(imp) {
  var ex = extractInfo.bind(imp),
    imgUrl = ex('img'),
    nextUrl = ex('next'),
    numPages = ex('numpages'),
    curPage = ex('curpage', {
      type: 'index'
    }) || 1,
    nextChapter = ex('nextchap', {
      type: 'value',
      val: (imp.invchap && -1) || 1
    }),
    prevChapter = ex('prevchap', {
      type: 'value',
      val: (imp.invchap && 1) || -1
    }),
    xhr = new XMLHttpRequest(),
    d = document.implementation.createHTMLDocument(),
    addAndLoad = function(img, next) {
      updateStats();
      addImage(img, UI.images, curPage, function() {
        pagesLoaded += 1;
        updateStats();
      });
      loadNextPage(next);
    },
    updateStats = function() {
      UI.statsPages.textContent = ' ' + pagesLoaded + '/' + curPage + ' loaded' + (numPages ? ', ' + numPages + ' total' : '');
    },
    getPageInfo = function() {
      var page = d.body;
      d.body.innerHTML = xhr.response;
      try {
        // find image and link to next page
        addAndLoad(ex('img', imp.imgmod, page), ex('next', null, page));
      } catch (e) {
        log('error getting details from next page, assuming end of chapter.');
      }
    },
    loadNextPage = function(url) {
      if (mLoadLess && count % loadInterval === 0) {
        if (resumeUrl) {
          resumeUrl = null;
        } else {
          resumeUrl = url;
          log('waiting for user to scroll further before loading more images, loaded ' + count + ' pages so far, next url is ' + resumeUrl);
          return;
        }
      }
      if (curPage + 1 > numPages) {
        log('reached "numPages" ' + numPages + ', assuming end of chapter');
        return;
      }
      if (lastUrl === url) {
        log('last url (' + lastUrl + ') is the same as current (' + url + '), assuming end of chapter');
        return;
      }
      curPage += 1;
      count += 1;
      lastUrl = url;
      if (imp.pages) {
        imp.pages(url, curPage, addAndLoad, ex, getPageInfo);
      } else {
        xhr.open('get', url);
        xhr.onload = getPageInfo;
        xhr.onerror = function() {
          log('failed to load page, aborting', 'error');
        };
        xhr.send();
      }
    },
    count = 1,
    pagesLoaded = curPage - 1,
    loadInterval = 10,
    lastUrl, UI, resumeUrl;
  
  if (!imgUrl || !nextUrl) {
    log('failed to retrieve ' + (!imgUrl ? 'image url' : 'next page url'), 'exit');
  }

  UI = getViewer(prevChapter, nextChapter);

  UI.statsPages.textContent = ' 0/1 loaded, ' + numPages + ' total';

  if (mLoadLess) {
    window.addEventListener('scroll', throttle(function(e) {
      if (!resumeUrl) return; // exit early if we don't have a position to resume at
      var scrollBottom = document.body.scrollHeight - ((document.body.scrollTop || document.documentElement.scrollTop) + window.innerHeight);
      if (scrollBottom < 4500) {
        log('user scroll nearing end, loading more images starting from ' + resumeUrl);
        loadNextPage(resumeUrl);
      }
    }, 100));
  }

  addAndLoad(imgUrl, nextUrl);

};

var pageUrl = window.location.href,
  btnLoadCss = toStyleStr({
    'position': 'fixed',
    'bottom': 0,
    'right': 0,
    'padding': '5px',
    'margin': '0 10px 10px 0',
    'z-index': '99999'
  }),
  btnLoad;

// used when switching chapters
var autoload = storeGet('autoload');
// manually set by user in menu
var mAutoload = storeGet('mAutoload') || false;
// should we load less pages at a time?
var mLoadLess = storeGet('mLoadLess') === false ? false : true;

// clear autoload
storeDel('autoload');

// register menu commands
if (typeof GM_registerMenuCommand === 'function') {
  GM_registerMenuCommand('ML: ' + (mAutoload ? 'Disable' : 'Enable') + ' manga autoload', function() {
    storeSet('mAutoload', !mAutoload);
    window.location.reload();
  });
  GM_registerMenuCommand('ML: Load ' + (mLoadLess ? 'full chapter in one go' : '10 pages at a time'), function() {
    storeSet('mLoadLess', !mLoadLess);
    window.location.reload();
  });
}

log('starting...');

var success = implementations.some(function(imp) {
  var intervalId;
  if (imp.match && (new RegExp(imp.match, 'i')).test(pageUrl)) {
    if (BM_MODE || mAutoload || autoload) {
      log('autoloading...');
      if(typeof imp.wait === 'function') {
        log('Waiting for load condition to be fulfilled');
        intervalId = setInterval(function() {
          if(imp.wait()) {
            log('Condition fulfilled, loading');
            clearInterval(intervalId);
            loadManga(imp);
          }
        }, 200);
      } else {
        setTimeout(loadManga.bind(null, imp), imp.wait || 0);
      }
      return true;
    }
    // append button to dom that will trigger the page load
    btnLoad = createButton('Load Manga', function(evt) {
      loadManga(imp);
      this.remove();
    }, btnLoadCss);
    document.body.appendChild(btnLoad);
    return true;
  }
});

if (!success) {
  log('no implementation for ' + pageUrl, 'error');
}