var lite = isLite();
localStorage.lite = lite ? '1' : '0';
var helper = lite ? 'chromelite' : 'chrome';

// default preferences
var default_preferences = {
  version: 0,
  enable: 1,
  lmFileHosting: 1,
  lmMediaHosting: 1,
  moduleYoutube: 1,
  moduleDailymotion: 1,
  moduleVimeo: 1,
  moduleVkontakte: 1,
  moduleOdnoklassniki: 1,
  moduleShowDownloadInfo: 1,
  ytHideFLV: 0,
  ytHideMP4: 0,
  ytHideWebM: 1,
  ytHide3GP: 1,
  ytHide3D: 1,
  vkShowBitrate: 0
};

var pref_names = {
  youtube: 'moduleYoutube',
  dailymotion: 'moduleDailymotion',
  vimeo: 'moduleVimeo',
  vk: 'moduleVkontakte',
  odnoklassniki: 'moduleOdnoklassniki'
};

// localStorage == widget.preferences
for (var k in default_preferences)
{
  if (!(k in localStorage))
    localStorage[k] = default_preferences[k]; // set default preference
}

// modules[tab.id] = moduleName
var modules = {};
chrome.tabs.onRemoved.addListener(function(tabId){
  if (tabId in modules)
    delete modules[tabId];
});

// routes[action] = handler
// handler - function(request, sender) {
//  ... code ...
//  return response;
// }
var routes = {
  initModule: function (request, sender, callback)
  {
    var response = {};
    var moduleName = request.moduleName;

    if (sender.tab)
    {
      modules[sender.tab.id] = moduleName;

      response.lite = lite;
      response.moduleEnable = localStorage.enable == '1';
      response.moduleShowDownloadInfo = localStorage.moduleShowDownloadInfo == '1';

      var info = chrome.app.getDetails();
      response.version = info.version;

      if (moduleName == 'lm')
      {
        response.moduleEnable &= localStorage.lmFileHosting == '1'
          || localStorage.lmMediaHosting == '1';

        response.lmMediaHosting = localStorage.lmMediaHosting;
        response.lmFileHosting = localStorage.lmFileHosting;
      }
      else if(moduleName != 'savefrom')
      {
        response.moduleEnable &= localStorage[pref_names[moduleName]] == '1';

        response.ytHideFLV = localStorage.ytHideFLV;
        response.ytHideMP4 = localStorage.ytHideMP4;
        response.ytHideWebM = localStorage.ytHideWebM;
        response.ytHide3GP = localStorage.ytHide3GP;
        response.ytHide3D = localStorage.ytHide3D;

        if(moduleName == 'vk')
        {
          response.vkShowBitrate = localStorage.vkShowBitrate;
        }
      }
    }

    callback(response);
  },


  hideDownloadInfo: function(request, sender){
    localStorage.moduleShowDownloadInfo = '0';
  },


  getVimeoLinks: function (request, sender, callback)
  {
    function callback_links(links, title)
    {
      var response = {
        action: request.action,
        extVideoId: request.extVideoId,
        links: links,
        title: title
      };

      callback(response);
    }

    getVimeoLinks(request.extVideoId, callback_links);
  },


  getVKLinks: function (request, sender, callback)
  {
    function callback_links(vid, links, title)
    {
      var response = {
        action: request.action,
        extVideoId: vid ? vid : request.extVideoId,
        links: links,
        title: title
      };

      callback(response);
    }

    getVKLinks(request.extVideoId, callback_links);
  },


  getYoutubeLinks: function (request, sender, callback)
  {
    function callback_links(links, title, subtitles)
    {
      var response = {
        action: request.action,
        extVideoId: request.extVideoId,
        links: links,
        title: title,
        subtitles: subtitles
      };

      callback(response);
    }

    getYoutubeLinks(sender.tab.url, request.extVideoId, request.checkSubtitles, callback_links);
  },


  getOdnoklassnikiLinks: function (request, sender, callback)
  {
    function callback_links(links)
    {
      var response = {
        action: request.action,
        extVideoId: request.extVideoId,
        links: links,
        title: request.title
      };

      callback(response);
    }

    getOdnoklassnikiLinks(request.extVideoId, callback_links);
  },


  getOdnoklassnikiAudioLinks: function (request, sender, callback)
  {
    function callback_links(data)
    {
      var response = {
        action: request.action,
        trackId: request.trackId,
        jsessionId: request.jsessionId,
        data: data
      };

      callback(response);
    }

    getOdnoklassnikiAudioLinks(sender.tab.url, request.trackId, request.jsessionId, callback_links);
  },


  getFileSize: function (request, sender, callback)
  {
    getFileSize(request.url, callback);
  }
};


// content scripts dispatcher
chrome.extension.onRequest.addListener(function(request, sender, callback){
  //console.log('dispatcher', request, sender, callback);
  routes[request.action](request, sender, callback);
});


// is lite version
function isLite()
{
  var info = chrome.app.getDetails();
  if(info && info.name && info.name.search(/\s+lite/i) > -1)
    return true;

  return false;
}


// actions from menu
function enableExtension()
{
  localStorage.enable = (localStorage.enable == '0') ? '1' : '0';
  setButtonParams();
}


function downloadFromCurrentPage()
{
  chrome.tabs.getSelected(null, function(tab)
  {
    var url = 'http://savefrom.net/?url=' + encodeURIComponent(tab.url) +
      '&utm_source=' + helper + '&utm_medium=extensions&utm_campaign=bookmarklet';

    chrome.tabs.create({url: url, selected: true});
  });
}


// tab actions

var tabActions = ['updateLinks', 'downloadPlaylist', 'downloadMP3Files'];

function tabAction(request, tab)
{
  if (tab)
  {
    chrome.tabs.sendRequest(tab.id, request);
  }
  else
  {
    chrome.tabs.getSelected(null, function(tab){
      chrome.tabs.sendRequest(tab.id, request);
    });
  }
}

function createAction(name, tab)
{
  return function(){
    tabAction({action: name}, tab);
  };
}

for (var i = 0; i < tabActions.length; i++)
{
  var actionName = tabActions[i];
  window[actionName] = createAction(actionName);
}


// ---------

setButtonParams();

if(localStorage.enable != '0')
  checkVersion();

function setButtonParams()
{
  var icon = {path: 'images/icon_18.png'};
  var title = {title: chrome.i18n.getMessage("titleDefault")};

  if(localStorage.enable == '0')
  {
    title.title = chrome.i18n.getMessage("titleDesabled");
    icon.path = 'images/icon_disabled_18.png';
  }

  chrome.browserAction.setIcon(icon);
  chrome.browserAction.setTitle(title);
}


function fixPref(pref)
{
  for(i = 0; i < pref.length; i++)
  {
    if(localStorage[pref[i].name] != pref[i].check)
      localStorage[pref[i].name] = pref[i].def;
  }
}


function checkVersion()
{
  var url = '';
  var info = chrome.app.getDetails();

  if(!localStorage.version || localStorage.version == '0')
  {
    // first run
    url = 'http://savefrom.net/user.php?helper=' + helper + ';firstrun';
  }
  else if(localStorage.version != info.version)
  {
    // update
    //url = 'http://savefrom.net/user.php?helper=' + helper + ';update';
  }

  if(url)
  {
    localStorage.version = info.version;
    chrome.tabs.create({url: url, selected: true});
  }
}


function sendRequest(url, callback, method, referer, post, cookie, header)
{
  var req = new XMLHttpRequest();
  if (!req)
    return;

  method = method ? method : ((post) ? 'POST' : 'GET');

  req.open(method, url, true);

  if(referer)
    req.setRequestHeader('Referer', referer);

  if(cookie)
    req.setRequestHeader('Cookie', cookie);

  if(post)
  {
    req.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    req.setRequestHeader("Content-Length", post.length);
  }

  if(header)
  {
    for(var i = 0; i < header.length; i++)
    {
      req.setRequestHeader(header[i][0], header[i][1]);
    }
  }

  req.onreadystatechange = function ()
  {
    if (req.readyState != 4)
      return;

    callback(req);
  };

  if (req.readyState == 4)
  {
    return;
  }

  if(post)
    req.send(post);
  else
    req.send();
}


function getFileSize(url, callback, referer, cookie, header)
{
  sendRequest(url, function(req){
    var response = {
      fileSize: 0,
      fileType: ''
    };

    if (req.status == 200)
    {
      var s = req.getResponseHeader('Content-Length');
      if(s)
      {
        s = parseInt(s);
        if(!isNaN(s))
          response.fileSize = s;
      }

      var t = req.getResponseHeader('Content-Type');
      if(t)
        response.fileType = t;
    }

    callback(response);

  }, 'HEAD', referer, null, cookie, header);
}


function getVimeoLinks(videoId, callback)
{
  var links = [], title = '';

  sendRequest('http://vimeo.com/moogaloop/load/clip:' + videoId + '/', function(r){
    try
    {
      if(r.status == 200 && r.responseXML)
      {
        var sig = r.responseXML.querySelector('request_signature');
        if(sig && sig.firstChild.nodeValue)
        {
          if(sig)
          {
            var url = 'http://vimeo.com/moogaloop/play/clip:' +
              videoId + '/' + sig.firstChild.nodeValue + '/';

            var sigExp = r.responseXML.querySelector('request_signature_expires');
            if(sigExp && sigExp.firstChild.nodeValue)
              url += sigExp.firstChild.nodeValue + '/';

            var t = r.responseXML.querySelector('video caption');
            if(t && t.firstChild.nodeValue)
              title = t.firstChild.nodeValue;

            links.push({
              url: url + '?q=sd',
              name: 'SD',
              type: 'mp4',
              ext: 'MP4'
            });

            var hd = r.responseXML.querySelector('isHD');
            if(hd && hd.firstChild.nodeValue == '1')
            {
              links.push({
                url: url + '?q=hd',
                name: 'HD',
                type: 'mp4',
                ext: 'MP4'
              });
            }
          }
        }
      }
    }
    finally
    {
      if(links.length)
        callback(links, title);
      else
        getVimeoNoEmbedLinks(videoId, callback);
    }
  });
}


function getVimeoNoEmbedLinks(videoId, callback)
{
  var links = [], title = '';

  sendRequest('http://vimeo.com/' + videoId, function(r){
    try
    {
      if(r.status == 200 && r.responseText)
      {
        var re = new RegExp('clip' + videoId + '_\\d+\\s*=\\s*(\\{[\\s\\S]+?\\})\\s*;', 'i');

        var config = r.responseText.match(re);
        if(config && config.length > 1)
        {
          config = config[1].replace(/(\{|,)\s*(\w+)\s*:/ig, '$1"$2":').
            replace(/(:\s+)\'/g, '$1"').replace(/\'([,\]\}])/g, '"$1');
          config = JSON.parse(config);
          config = config.config;

          if(config && config.request && config.video &&
            config.request.signature && config.request.timestamp)
          {
            var data = {
              'clip_id': videoId,
              'sig': config.request.signature,
              'time': config.request.timestamp,
              'type': 'moogaloop_local',
              'quality': 'sd',
              'codecs': 'H264,VP8,VP6'
            };

            var title = config.video.title ? config.video.title : '';

            links.push({
              url: 'http://player.vimeo.com/play_redirect?' + getQueryString(data),
              name: 'SD',
              type: 'mp4',
              ext: 'MP4'
            });

            if(config.video.hd == 1)
            {
              data.quality = 'hd';
              links.push({
                url: 'http://player.vimeo.com/play_redirect?' + getQueryString(data),
                name: 'HD',
                type: 'mp4',
                ext: 'MP4'
              });
            }

            if(config.video.files && config.video.files.h264)
            {
              var files = config.video.files.h264;
              if(files.length > 0)
              {
                for(var i = 0; i < files.length; i++)
                {
                  if(files[i] != 'sd' && files[i] != 'hd')
                  {
                    data.quality = files[i];
                    links.push({
                      url: 'http://player.vimeo.com/play_redirect?' + getQueryString(data),
                      name: (files[i].length <= 3) ? files[i].toUpperCase() : ucfirst(files[i].toLowerCase()),
                      type: 'mp4',
                      ext: 'MP4'
                    });
                  }
                }
              }
            }
          }
        }
      }
    }
    finally
    {
      callback(links, title);
    }
  });
}


function getVKLinks(videoId, callback)
{
  var links = {}, title = '';

  var vid = videoId;
  if(vid.search(/^video-?\d+_\d+/i) == -1)
  {
    var oid = '', id = '';
    var m = vid.match(/(?:^|&)oid=(-?\d+)/i);
    if(m && m.length > 1)
      oid = m[1];

    m = vid.match(/(?:^|&)id=(-?\d+)/i);
    if(m && m.length > 1)
      id = m[1];

    vid = '';
    if(oid && id)
      vid = 'video' + oid + '_' + id;
  }

  if(!vid)
  {
    callback(vid, links, title);
    return;
  }

  var url = 'http://vk.com/' + vid;

  sendRequest(url, function(r){
    try
    {
      if(r.status == 200 && r.responseText)
      {
        var json = r.responseText.match(/var vars\s*=\s*(\{[^\}]+\})/i);
        if(json)
        {
          try
          {
            json = json[1];

            if(json.search(/^\{\s*\\\"/) > -1)
              json = json.replace(/\\\"/g, '"');

            json = JSON.parse(json);
            if(json)
            {
              links = json;
            }
          }
          catch(err){}
        }
      }
    }
    finally
    {
      callback(vid, links, title);
    }
  });
}


function getYoutubeLinks(eurl, videoId, checkSubtitles, callback) {
  var links = {}, title = '';
  eurl = encodeURIComponent(eurl);
  var url = 'http://www.youtube.com/get_video_info?video_id=' + videoId +
    '&asv=3&eurl=' + eurl + '&el=embedded';

  var cookies = 'VISITOR_INFO1_LIVE=; PREF=; GEO=; use_hitbox=';

  sendRequest(url, function(r){
    try
    {
      if(r.status == 200 && r.responseText)
      {
        var fmtMap = r.responseText.match(
          /(?:^|&)(?:fmt_url_map|url_encoded_fmt_stream_map)=([^\s\&\"]+)/i);

        if(fmtMap && fmtMap.length > 1)
        {
          title = r.responseText.match(/(?:^|&)title=([^\s\&\"]+)/i);
          var titleParam = '';
          if(title)
          {
            title = title[1].replace(/\+/g, '%20');
            title = decodeURIComponent(title).
              replace(/[\x2F\x5C\x3A\x7C]/g, '-').
              replace(/[\x2A\x3F]/g, '').
              replace(/\x22/g, '\'').
              replace(/\x3C/g, '(').
              replace(/\x3E/g, ')').
              replace(/(?:^\s+)|(?:\s+$)/g, '');

            titleParam = '&title=' + encodeURIComponent(title);
          }

          var l = {};

          fmtMap = fmtMap[1];

          if(fmtMap.search(/url(=|%3d)http/i) > -1)
          {
            if(fmtMap.search(/url%3dhttp/i) > -1)
              fmtMap = decodeURIComponent(fmtMap);

            fmtMap = fmtMap.split(',');
            for(var i = 0; i < fmtMap.length; ++i)
            {
              var query = parseQuery(fmtMap[i]);
              if(query.url)
              {
                query.url = decodeURIComponent(query.url);
                if(query.url.search(/(\?|&)sig(nature)?=/i) == -1)
                {
                  if(query.sig)
                    query.url += '&signature=' + query.sig;
                  else if(query.signature)
                    query.url += '&signature=' + query.signature;
                }

                if(query.url.search(/(\?|&)itag=/i) == -1)
                {
                  if(query.itag)
                    query.url += '&itag=' + query.itag;
                }

                var fmt = query.url.match(/(?:\?|&)itag=(\d+)/i);
                if(fmt && fmt.length > 1)
                {
                  fmt = fmt[1];

                  query.url = query.url.replace(/(\?|&)sig=/i, '$1signature=').
                    replace(/\\u0026/ig, '&').replace(/\\\//g, '/');

                  l[fmt] = query.url;

                  if(titleParam)
                    l[fmt] += titleParam;
                }
              }
            }
          }
          else
          {
            fmtMap = decodeURIComponent(fmtMap);
            fmtMap = fmtMap.replace(/\\u0026/ig, '&').replace(/\\\//g, '/');
            fmtMap = fmtMap.replace(/,(\d+)\|/g, "\n$1|");
            fmtMap = fmtMap.split('\n');

            for(var i = 0; i < fmtMap.length; i++)
            {
              var t = fmtMap[i].split('|');
              if(t && t.length >= 2)
              {
                l[t[0]] = t[1];
                if(titleParam)
                  l[t[0]] += titleParam;
              }
            }
          }

          if(l)
            links = l;
        }
      }
    }
    finally
    {
      if(checkSubtitles)
      {
        checkYoutubeSubtitles(videoId, function(subtitles){
          callback(links, title, subtitles);
        });
      }
      else
        callback(links, title, null);
    }
  }, '', url, '', cookies);
}


function checkYoutubeSubtitles(videoId, callback)
{
  var url = 'http://video.google.com/timedtext?hl=en&v=' + videoId +
    '&type=list&tlangs=1';

  sendRequest(url, function(r){
    var result = false;
    if(r.status == 200 && r.responseXML)
    {
      if(r.responseXML.querySelector('target, track'))
        result = true;
    }

    callback(result);
  });
}


function getOdnoklassnikiLinks(extVideoId, callback)
{
  if(!extVideoId)
  {
    callback(null);
    return;
  }

  var url = 'http://in.video.mail.ru/cgi-bin/video/oklite?eid=' + extVideoId;

  sendRequest(url, function(r){
    if(r.status == 200 && r.responseText)
    {
      var u = 'http://www.okcontent.video.mail.ru/media/';

      var host = r.responseText.match(/\$vcontentHost=([^\s\"'\<\>]+)/i);
      if(host && host.length > 1)
        u = 'http://' + host[1] + '/media/';

      u += extVideoId;

      var links = [];
      links.push({
        url: u + '-v.mp4',
        title: 'SD',
        ext: 'FLV'
      });

      if(r.responseText.search(/\$HDexist=1/i) > -1)
      {
        links.push({
          url: u + '-hv.mp4',
          title: 'HD',
          ext: 'MP4'
        });
      }

      if(links)
      {
        callback(links);
        return;
      }
    }

    callback(null);
  }, '', url);
}


function getOdnoklassnikiAudioLinks(pageUrl, trackId, jsessionId, callback)
{
  if(!trackId || !jsessionId)
  {
    callback(null);
    return;
  }

  var url = 'http://wmf1.odnoklassniki.ru/play;jsessionid=' + jsessionId +
    '?tid=' + trackId + '&';

  sendRequest(url, function(r){
    var data = null;
    if(r.status == 200 && r.responseText)
    {
      data = JSON.parse(r.responseText);
    }

    callback(data);
  }, '', url);
}


function parseQuery(query)
{
  var k = {};
  var re = /[?&]?([^=]+)(?:=([^&]*))?/g;
  while(m = re.exec(query))
  {
    if(m[1] && m[2])
      k[m[1]] = m[2];
    else if(m[1])
      k[m[1]] = '';
  };

  return k;
}


function getQueryString(query, key_prefix, key_suffix)
{
  if(!query || typeof(query) != 'object')
    return '';

  if(key_prefix === undefined)
    key_prefix = '';

  if(key_suffix === undefined)
    key_suffix = '';

  var str = '';
  for(key in query)
  {
    if(str.length)
      str += '&';

    if(query[key] instanceof Object)
    {
      if(!key_prefix)
        key_prefix = '';

      if(!key_suffix)
        key_suffix = '';

      str += getQueryString(query[key], key_prefix + key + "[", "]" + key_suffix);
    }
    else
      str += key_prefix + escape(key) + key_suffix + '=' + escape(query[key]);
  }

  return str;
}


function ucfirst(str)
{
  if(str.length)
    str = str.charAt(0).toUpperCase() + str.slice(1);

  return str;
}


fixPref([
  {name: 'button', check: '0', def: '1'},
  {name: 'moduleVimeo', check: '0', def: '1'},
  {name: 'ytHideFLV', check: '1', def: '0'},
  {name: 'ytHideMP4', check: '1', def: '0'},
  {name: 'ytHideWebM', check: '0', def: '1'},
  {name: 'ytHide3GP', check: '0', def: '1'},
  {name: 'ytHide3D', check: '0', def: '1'},
  {name: 'vkShowBitrate', check: '1', def: '0'}
]);