/*
 * jQuery selectbox plugin
 *
 * Copyright (c) 2007 Sadri Sahraoui (brainfault.com)
 * Licensed under the GPL license and MIT:
 *   http://www.opensource.org/licenses/GPL-license.php
 *   http://www.opensource.org/licenses/mit-license.php
 *
 * The code is inspired from Autocomplete plugin (http://www.dyve.net/jquery/?autocomplete)
 *
 * Revision: $Id$
 * Version: 0.6
 * 
 * Changelog :
 *  Version 0.6
 *  - Fix IE scrolling problem
 *  Version 0.5 
 *  - separate css style for current selected element and hover element which solve the highlight issue 
 *  Version 0.4
 *  - Fix width when the select is in a hidden div   @Pawel Maziarz
 *  - Add a unique id for generated li to avoid conflict with other selects and empty values @Pawel Maziarz
 */
jQuery.fn.extend({
  selectbox: function(options) {
    return this.each(function() {
      new jQuery.SelectBox(this, options);
    });
  }
});


/* pawel maziarz: work around for ie logging */
if (!window.console) {
  var console = {
    log: function(msg) { 
   }
  }
}
/* */

jQuery.SelectBox = function(selectobj, options) {
  
  var opt = options || {};
  opt.inputClass = opt.inputClass || "selectbox";
  opt.containerClass = opt.containerClass || "selectbox-wrapper";
  opt.hoverClass = opt.hoverClass || "current";
  opt.currentClass = opt.selectedClass || "selected"
  opt.debug = opt.debug || false;
  
  var elm_id = selectobj.id;
  var active = 0;
  var inFocus = false;
  var hasfocus = 0;
  //jquery object for select element
  var $select = jQuery(selectobj);
  if ($select.get(0).tagName != "SELECT") return;
  // jquery container object
  var $container = setupContainer(opt);
  //jquery input object 
  //var $input = setupInput(opt);
  //jquery div object 
  var $inputDiv = setupInputDiv(opt);

  // hide select and append newly created elements
  $select.hide().before($inputDiv).before($container);
  $select.get(0).style.display = "none";
  $select.get(0).style.visibility = "hidden";
  $select.get(0).selectObj = this;
  this.setValue = function(value)
  {
	var new_li = jQuery('#'+$inputDiv.attr('id')+'#'+value);
	if (!new_li) return;
    jQuery('li.'+opt.currentClass).removeClass(opt.currentClass);
    new_li.addClass(opt.currentClass);
	jQuery($inputDiv.attr('id')+'#'+value).addClassName(opt.currentClass);
    setCurrent();
    $select.change();
    $select.get(0).blur();
    hideMe();
  };

  this.remove = function()
  {
    $container.remove();
	$inputDiv.remove();
	$select.get(0).style.display = "block";
	$select.get(0).style.visibility = "visible";
	$select.get(0).selectObj = null;
  };

  init();
  
  $inputDiv
  .click(function(){
    if (!inFocus) {
      $container.toggle();
    }
  })
  .focus(function(){
     if ($container.not(':visible')) {
         inFocus = true;
         $container.show();
     }
  })
  .keydown(function(event) {     
    switch(event.keyCode) {
      case 38: // up
        event.preventDefault();
        moveSelect(-1);
        break;
      case 40: // down
        event.preventDefault();
        moveSelect(1);
        break;
      //case 9:  // tab 
      case 13: // return
        event.preventDefault(); // seems not working in mac !
        jQuery('li.'+opt.hoverClass).trigger('click');
        break;
      case 27: //escape
        hideMe();
        break;
    }
  })
  .blur(function() {
    if ($container.is(':visible') && hasfocus > 0 ) {
      if(opt.debug) console.log('container visible and has focus')
    } else {
      // Workaround for ie scroll - thanks to Bernd Matzner
      if(jQuery.browser.msie || jQuery.browser.safari){ // check for safari too - workaround for webkit
        if(document.activeElement.getAttribute('id').indexOf('_container')==-1){
          hideMe();
        } else {
          $inputDiv.focus();
        }
      } else {
        hideMe();
      }
    }
  });


  function hideMe() { 
    hasfocus = 0;
    $container.hide(); 
  }
  
  function init() {
    $container.append(getSelectOptions($inputDiv.attr('id'))).hide();
  //  $container.append("<!--[if lte IE 6.5]><iframe></iframe><![endif]-->");
    var width = $inputDiv.css('width');
    $container.width(width);
    }
  
  function setupContainer(options) {
    var container = document.createElement("div");
    $container = jQuery(container);
    $container.attr('id', elm_id+'_container');
    $container.addClass(options.containerClass);
    return $container;
  }
  
  function setupInputDiv(options) {
    var inputDiv = document.createElement("div");
    var $inputDiv = jQuery(inputDiv);
    $inputDiv.attr("id", elm_id+"_input");
    $inputDiv.attr("class", "selectbox");
    
    return $inputDiv;
  }
  /*
  function setupInput(options) {
    var input = document.createElement("input");
    var $input = jQuery(input);
    $input.attr("id", elm_id+"_input");
    $input.attr("type", "text");
    $input.addClass(options.inputClass);
    $input.attr("autocomplete", "off");
    $input.attr("readonly", "readonly");
    $input.attr("tabIndex", $select.attr("tabindex")); // "I" capital is important for ie
    
    return $input;  
  }*/
  
  function moveSelect(step) {
    var lis = jQuery("li", $container);
    if (!lis || lis.length == 0) return false;
    active += step;
    //loop through list
    if (active < 0) {
      active = lis.size();
    } else if (active > lis.size()) {
      active = 0;
    }
    scroll(lis, active);
    lis.removeClass(opt.hoverClass);

    jQuery(lis[active]).addClass(opt.hoverClass);
  }
  
  function scroll(list, active) {
      var el = jQuery(list[active]).get(0);
      var list = $container.get(0);
      
      if (el.offsetTop + el.offsetHeight > list.scrollTop + list.clientHeight) {
        list.scrollTop = el.offsetTop + el.offsetHeight - list.clientHeight;      
      } else if(el.offsetTop < list.scrollTop) {
        list.scrollTop = el.offsetTop;
      }
  }
  
  function setCurrent() {  
    var li = jQuery("li."+opt.currentClass, $container).get(0);
    var ar = (''+li.id).split('#');
    var el = ar[ar.length-1];
    $select.val(el);
    $inputDiv.text(jQuery(li).html());
    return true;
  }
  
  // select value
  function getCurrentSelected() {
    return $select.val();
  }
  
  // input value
  function getCurrentValue() {
    return $inputDiv.text();
  }
  
  function getSelectOptions(parentid) {
    var select_options = new Array();
    var ul = document.createElement('ul');
    $select.children('option').each(function() {
      var li = document.createElement('li');
      li.setAttribute('id', parentid + '#' + jQuery(this).get(0).value);
      li.innerHTML = jQuery(this).html();
      if (jQuery(this).is(':selected')) {
        $inputDiv.text(jQuery(this).html());
        jQuery(li).addClass(opt.currentClass);
      }
      ul.appendChild(li);
      jQuery(li)
      .mouseover(function(event) {
        hasfocus = 1;
        if (opt.debug) console.log('over on : '+this.id);
        jQuery(event.target, $container).addClass(opt.hoverClass);
      })
      .mouseout(function(event) {
        hasfocus = -1;
        if (opt.debug) console.log('out on : '+this.id);
        jQuery(event.target, $container).removeClass(opt.hoverClass);
      })
      .click(function(event) {
        var fl = jQuery('li.'+opt.hoverClass, $container).get(0);
        if (opt.debug) console.log('click on :'+this.id);
        jQuery('li.'+opt.currentClass).removeClass(opt.currentClass); 
        jQuery(this).addClass(opt.currentClass);
        setCurrent();
        $select.change();
        $select.get(0).blur();
        hideMe();
      });
    });
    return ul;
  }
  
};