/*
 * Copyright (c) 2008 Greg Weber greg at gregweber.info
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * documentation at http://gregweber.info/projects/uitablefilter
 *
 * allows table rows to be filtered (made invisible)
 * <code>
 * t = $('table')
 * $.uiTableFilter( t, phrase )
 * </code>
 * arguments:
 *   jQuery object containing table rows
 *   phrase to search for
 *   optional arguments:
 *     column to limit search too (the column title in the table header)
 *     ifHidden - callback to execute if one or more elements was hidden
 */
jQuery.uiTableFilter = function(jq, phrase, column, ifHidden){

  var new_hidden = false;
  if( this.last_phrase === phrase ) return false;

  var phrase_length = phrase.length;
  phrase = phrase.toLowerCase();

  var success = function(elem) { elem.show() }
  var failure = function(elem) { elem.hide() }

  if( column ) {
    
    var index = null;
    jq.find("thead > tr:first > th").each( function(i){
    
      if ($(this).text() == column) {
        
        index = i;
        return false;
      
      }
    
    });
    
    var iselector = "td:eq(" + index + ")";
  
    var search_text = function( ){
    
      var elem = jQuery(this);
      jQuery.uiTableFilter.has_words( jQuery(elem.find(iselector)).text(), phrase ) ?
      success(elem) : failure(elem);
    
    }
    
  } else {
    
    var search_text = function() {
    
        var elem = jQuery(this);
        jQuery.uiTableFilter.has_words( elem.text(), phrase ) ? elem.show() : elem.hide();
    
    }
    
  }

  if( (phrase.size > 1) && (phrase.substr(0, phrase_length - 1) ===  this.last_phrase) ) {

    if( phrase[-1] === " " ) { 
      
      this.last_phrase = phrase; 
      return false; 
    
    }

    success = function(elem) { elem.hide(); new_hidden = true; }
    failure = function(elem) {;}
    var words = words[-1];
    jq.find("tbody tr:visible").each( search_text )
  
  } else {
    
    new_hidden = true;
    jq.find("tbody > tr").each( search_text );
  
  }

  last_phrase = phrase;
  if( ifHidden && new_hidden ) ifHidden();
  return jq;

};

jQuery.uiTableFilter.last_phrase = ""

jQuery.uiTableFilter.has_words = function( str, phrase, caseSensitive ) {

  var text = caseSensitive ? str : str.toLowerCase();

  if (text == phrase || phrase == "") {
      
      return true; 
 
  }
 
  return false;

}