//author: Blair Vanderhoof
//https://github.com/blairvanderhoof/gist-embed
$(function(){
  var gistMarkerId = 'gist-';

  //find all code elements containing "gist-" the id attribute.
  $('code[id*="'+gistMarkerId+'"]').each(function(){
    var $elem = $(this),
      id,
      url,
      file,
      line,
      data = {};

    id              = $elem.attr('id') || '';
    file            = $elem.attr('data-file');
    line            = $elem.attr('data-line');
    
    if(file){
      data.file = file;
      splittedFileName = file.split('.').join('-');
    }

    //if the id doesn't begin with 'gist-', then ignore the code block
    if (!id || id.indexOf('gist-') !== 0) return false;

    //make block level so loading text shows properly
    $elem.css('display', 'block');
    
    //get the numeric id from the id attribute of the element holder
    id = id.substr(0, gistMarkerId.length) === gistMarkerId ? id.replace(gistMarkerId, '') : null;

    //make sure result is a numeric id
    if(!isNaN(parseInt(id, 10))){
      url = 'https://gist.github.com/' + id + '.json';
      //loading
      $elem.html('Loading gist ' + url + (data.file ? ', file: ' + data.file : '') + '...');
      //request the json version of this gist
      $.ajax({
        url: url,
        data: data,
        dataType: 'jsonp',
        timeout: 10000,
        success: function(response){
          //the html payload is in the div property
          if(response && response.div){
            //add the stylesheet if it does not exist
            if(response.stylesheet && $('link[href="' + response.stylesheet + '"]').length === 0){
              var l = document.createElement("link"),
                head = document.getElementsByTagName("head")[0];

              l.type = "text/css";
              l.rel = "stylesheet";
              l.href = response.stylesheet;
              head.insertBefore(l, head.firstChild);
            }

            var random = Math.floor(Math.random() * 100000);
            $elem.html("<div id='" + random + "'>" + response.div + "</div>");

            if(line){
              var lineNumbers = getLineNumbers(line);
              $('#' + random).find('.line').each(function(index){
                if(($.inArray(index + 1, lineNumbers)) == -1){
                  $(this).remove();
                }
              });

              lineNumber = 1;
              $('#' + random).find('.line-number').each(function(index){
                if(($.inArray(index + 1, lineNumbers)) == -1){
                  $(this).remove();
                }
                else{
                  $(this).html(lineNumber++);
                }
              });
            }
            if($elem.attr('data-showFooter') && $elem.attr('data-showFooter') == "false"){
              $('#' + random).find('.gist-meta').remove();
            }

            if($elem.attr('data-showLineNumbers') && $elem.attr('data-showLineNumbers') == "false"){
              $('#' + random).find('.line-numbers').remove();
            }
            $('#' + random).find('.gist-file').css('margin-bottom', '0px');
          }else{
            $elem.html('Failed loading gist ' + url);
          }
        },
        error: function(){
          $elem.html('Failed loading gist ' + url);
        }
      });
    }else{
      $elem.html('Failed loading gist with incorrect id format: ' + $elem.attr('id'));
    }
  });
});

function getLineNumbers(lineRangeString){
  var lineNumbers = new Array();
  var lineNumberSections = lineRangeString.split(',');
  for(var k = 0; k < lineNumberSections.length; k++){
    var range = lineNumberSections[k].split('-');
    if(range.length == 2){
      for(var i = parseInt(range[0]); i <= range[1]; i++){
        lineNumbers.push(i);
      }
    }
    else if(range.length == 1){
      lineNumbers.push(parseInt(range[0]));
    }
  }
  return lineNumbers;
}