/*!
 * jQuery hashchange event - v1.3 - 7/21/2010
 * http://benalman.com/projects/jquery-hashchange-plugin/
 * 
 * Copyright (c) 2010 "Cowboy" Ben Alman
 * Dual licensed under the MIT and GPL licenses.
 * http://benalman.com/about/license/
 */

(function($,window,undefined){
  '$:nomunge'; // Used by YUI compressor.
  
  // Reused string.
  var str_hashchange = 'hashchange',
    
    // Method / object references.
    doc = document,
    fake_onhashchange,
    special = $.event.special,
    
    doc_mode = doc.documentMode,
    supports_onhashchange = 'on' + str_hashchange in window && ( doc_mode === undefined || doc_mode > 7 );
  
  function get_fragment( url ) {
    url = url || location.href;
    return '#' + url.replace( /^[^#]*#?(.*)$/, '$1' );
  };
  
  $.fn[ str_hashchange ] = function( fn ) {
    return fn ? this.bind( str_hashchange, fn ) : this.trigger( str_hashchange );
  };
  
  $.fn[ str_hashchange ].delay = 50;
  special[ str_hashchange ] = $.extend( special[ str_hashchange ], {
    
    // Called only when the first 'hashchange' event is bound to window.
    setup: function() {
      // If window.onhashchange is supported natively, there's nothing to do..
      if ( supports_onhashchange ) { return false; }
      
      $( fake_onhashchange.start );
    },
    
    // Called only when the last 'hashchange' event is unbound from window.
    teardown: function() {
      // If window.onhashchange is supported natively, there's nothing to do..
      if ( supports_onhashchange ) { return false; }
      
      // Otherwise, we need to stop ours (if possible).
      $( fake_onhashchange.stop );
    }
    
  });
  
  fake_onhashchange = (function(){
    var self = {},
      timeout_id,
      
      // Remember the initial hash so it doesn't get triggered immediately.
      last_hash = get_fragment(),
      
      fn_retval = function(val){ return val; },
      history_set = fn_retval,
      history_get = fn_retval;
    
    // Start the polling loop.
    self.start = function() {
      timeout_id || poll();
    };
    
    // Stop the polling loop.
    self.stop = function() {
      timeout_id && clearTimeout( timeout_id );
      timeout_id = undefined;
    };
    
    function poll() {
      var hash = get_fragment(),
        history_hash = history_get( last_hash );
      
      if ( hash !== last_hash ) {
        history_set( last_hash = hash, history_hash );
        
        $(window).trigger( str_hashchange );
        
      } else if ( history_hash !== last_hash ) {
        location.href = location.href.replace( /#.*/, '' ) + history_hash;
      }
      
      timeout_id = setTimeout( poll, $.fn[ str_hashchange ].delay );
    };
    
    $.browser.msie && !supports_onhashchange && (function(){

      var iframe,
        iframe_src;
      
      self.start = function(){
        if ( !iframe ) {
          iframe_src = $.fn[ str_hashchange ].src;
          iframe_src = iframe_src && iframe_src + get_fragment();
          
          iframe = $('<iframe tabindex="-1" title="empty"/>').hide()
            
            .one( 'load', function(){
              iframe_src || history_set( get_fragment() );
              poll();
            })
            
            // Load Iframe src if specified, otherwise nothing.
            .attr( 'src', iframe_src || 'javascript:0' )
            
            .insertAfter( 'body' )[0].contentWindow;
          
          doc.onpropertychange = function(){
            try {
              if ( event.propertyName === 'title' ) {
                iframe.document.title = doc.title;
              }
            } catch(e) {}
          };
          
        }
      };
      
      self.stop = fn_retval;
      
      // Get history by looking at the hidden Iframe's location.hash.
      history_get = function() {
        return get_fragment( iframe.location.href );
      };
      
      history_set = function( hash, history_hash ) {
        var iframe_doc = iframe.document,
          domain = $.fn[ str_hashchange ].domain;
        
        if ( hash !== history_hash ) {
          // Update Iframe with any initial `document.title` that might be set.
          iframe_doc.title = doc.title;
          
          iframe_doc.open();
          
          // Set document.domain for the Iframe document as well, if necessary.
          domain && iframe_doc.write( '<script>document.domain="' + domain + '"</script>' );
          
          iframe_doc.close();
          
          // Update the Iframe's hash, for great justice.
          iframe.location.hash = hash;
        }
      };
      
    })();
 
    return self;
  })();
  
})(jQuery,this);