/**
 * Javascript auto-completion for form fields. jQuery based in 1.1.5.
 * Different types of auto-completion fields can be defined (e.g. with different data sets). For each one, a schema
 * can be created describing how to draw each row.
 */

var autofill_schemas = window.autofill_schemas || {};

/**
 * SCHEMA - GENERIC
 */

autofill_schemas.generic = {
  init: function(element, fillclass, params)
  {
    $(element).autocomplete(makeUrlNS('Special', 'Autofill', 'type=' + fillclass) + '&userinput=', {
        minChars: 3
    });
  }
}

/**
 * SCHEMA - USERNAME
 */

autofill_schemas.username = {
  init: function(element, fillclass, params)
  {
    params = params || {};
    var allow_anon = params.allow_anon ? '1' : '0';
    $(element).autocomplete(makeUrlNS('Special', 'Autofill', 'type=' + fillclass + '&allow_anon=' + allow_anon) + '&userinput=', {
        minChars: 3,
        formatItem: function(row, _, __)
        {
          var html = row.name_highlight + ' – ';
          html += '<span style="' + row.rank_style + '">' + row.rank_title + '</span>';
          return html;
        },
        tableHeader: '<tr><th>' + $lang.get('user_autofill_heading_suggestions') + '</th></tr>',
        showWhenNoResults: true,
        noResultsHTML: '<tr><td class="row1" style="font-size: smaller;">' + $lang.get('user_autofill_msg_no_suggestions') + '</td></tr>'
    });
  }
}

autofill_schemas.page = {
  init: function(element, fillclass, params)
  {
    $(element).autocomplete(makeUrlNS('Special', 'Autofill', 'type=' + fillclass) + '&userinput=', {
        minChars: 3,
        formatItem: function(row, _, __)
        {
          var html = '<u>' + row.name_highlight + '</u>';
          html += ' &ndash; ' + row.pid_highlight;
          return html;
        },
        showWhenNoResults: true,
        noResultsHTML: '<tr><td class="row1" style="font-size: smaller;">' + $lang.get('user_autofill_msg_no_suggestions') + '</td></tr>'
    });
  }
}

window.autofill_init_element = function(element, params)
{
  if ( element.af_initted )
    return false;
  
  params = params || {};
  // assign an ID if it doesn't have one yet
  if ( !element.id )
  {
    element.id = 'autofill_' + Math.floor(Math.random() * 100000);
  }
  var id = element.id;
  
  // get the fill type
  var fillclass = element.className;
  fillclass = fillclass.split(' ');
  fillclass = fillclass[1];
  
  var schema = ( autofill_schemas[fillclass] ) ? autofill_schemas[fillclass] : autofill_schemas['generic'];
  if ( typeof(schema.init) != 'function' )
  {
    schema.init = autofill_schemas.generic.init;
  }
  schema.init(element, fillclass, params);
  
  element.af_initted = true;
}

window.AutofillUsername = function(el, allow_anon)
{
  el.onkeyup = null;
  el.className = 'autofill username';
  autofill_init_element(el, { allow_anon: allow_anon });
}

window.AutofillPage = function(el)
{
  el.onkeyup = null;
  el.className = 'autofill page';
  autofill_init_element(el, {});
}

// note: init, then onload (the latter is called automatically)

window.autofill_onload = function()
{
  if ( this.loaded )
  {
    return true;
  }
  
  var inputs = document.getElementsByClassName('input', 'autofill');
  
  if ( inputs.length > 0 )
  {
    // we have at least one input that needs to be made an autofill element.
    // is spry data loaded?
    load_component('l10n');
  }
  
  this.loaded = true;
  
  for ( var i = 0; i < inputs.length; i++ )
  {
    autofill_init_element(inputs[i]);
  }
}

window.autofill_init = function()
{
  load_component(['l10n', 'jquery', 'jquery-ui']);
  
  if ( !window.jQuery )
  {
    throw('jQuery didn\'t load properly. Aborting auto-complete init.');
  }
  
  jQuery.autocomplete = function(input, options) {
    // Create a link to self
    var me = this;
  
    // Create jQuery object for input element
    var $input = $(input).attr("autocomplete", "off");
  
    // Apply inputClass if necessary
    if (options.inputClass) {
      $input.addClass(options.inputClass);
    }
  
    // Create results
    var results = document.createElement("div");
    $(results).addClass('tblholder').css('z-index', getHighestZ() + 1).css('margin-top', 0);
    $(results).css('clip', 'rect(0px,auto,auto,0px)').css('overflow', 'auto').css('max-height', '300px');
  
    // Create jQuery object for results
    // var $results = $(results);
    var $results = $(results).hide().addClass(options.resultsClass).css("position", "absolute");
    if( options.width > 0 ) {
      $results.css("width", options.width);
    }
  
    // Add to body element
    $("body").append(results);
  
    input.autocompleter = me;
  
    var timeout = null;
    var prev = "";
    var active = -1;
    var cache = {};
    var keyb = false;
    // hasFocus was false by default, see if making it true helps
    var hasFocus = true;
    var hasNoResults = false;
    var lastKeyPressCode = null;
    var mouseDownOnSelect = false;
    var hidingResults = false;
  
    // flush cache
    function flushCache(){
      cache = {};
      cache.data = {};
      cache.length = 0;
    };
  
    // flush cache
    flushCache();
  
    // if there is a data array supplied
    if( options.data != null ){
      var sFirstChar = "", stMatchSets = {}, row = [];
  
      // no url was specified, we need to adjust the cache length to make sure it fits the local data store
      if( typeof options.url != "string" ) {
        options.cacheLength = 1;
      }
  
      // loop through the array and create a lookup structure
      for( var i=0; i < options.data.length; i++ ){
        // if row is a string, make an array otherwise just reference the array
        row = ((typeof options.data[i] == "string") ? [options.data[i]] : options.data[i]);
  
        // if the length is zero, don't add to list
        if( row[0].length > 0 ){
          // get the first character
          sFirstChar = row[0].substring(0, 1).toLowerCase();
          // if no lookup array for this character exists, look it up now
          if( !stMatchSets[sFirstChar] ) stMatchSets[sFirstChar] = [];
          // if the match is a string
          stMatchSets[sFirstChar].push(row);
        }
      }
  
      // add the data items to the cache
      if ( options.cacheLength )
      {
        for( var k in stMatchSets ) {
          // increase the cache size
          options.cacheLength++;
          // add to the cache
          addToCache(k, stMatchSets[k]);
        }
      }
    }
  
    $input
    .keydown(function(e) {
      // track last key pressed
      lastKeyPressCode = e.keyCode;
      switch(e.keyCode) {
        case 38: // up
          e.preventDefault();
          moveSelect(-1);
          break;
        case 40: // down
          e.preventDefault();
          moveSelect(1);
          break;
        case 9:  // tab
        case 13: // return
          if( selectCurrent() ){
            // make sure to blur off the current field
            // (Enano edit - why do we want this, again?)
            // $input.get(0).blur();
            e.preventDefault();
          }
          break;
        default:
          active = -1;
          if (timeout) clearTimeout(timeout);
          timeout = setTimeout(function(){onChange();}, options.delay);
          break;
      }
    })
    .focus(function(){
      // track whether the field has focus, we shouldn't process any results if the field no longer has focus
      hasFocus = true;
    })
    .blur(function() {
      // track whether the field has focus
      hasFocus = false;
      if (!mouseDownOnSelect) {
        hideResults();
      }
    });
  
    hideResultsNow();
  
    function onChange() {
      // ignore if the following keys are pressed: [del] [shift] [capslock]
      if( lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32) ) return $results.hide();
      var v = $input.val();
      if (v == prev) return;
      prev = v;
      if (v.length >= options.minChars) {
        $input.addClass(options.loadingClass);
        requestData(v);
      } else {
        $input.removeClass(options.loadingClass);
        $results.hide();
      }
    };
  
    function moveSelect(step) {
  
      var lis = $("td", results);
      if (!lis || hasNoResults) return;
  
      active += step;
  
      if (active < 0) {
        active = 0;
      } else if (active >= lis.size()) {
        active = lis.size() - 1;
      }
  
      lis.removeClass("row2");
  
      $(lis[active]).addClass("row2");
      
      // scroll the results div
      // are we going up or down?
      var td_top = $dynano(lis[active]).Top() - $dynano(results).Top();
      var td_height = $dynano(lis[active]).Height();
      var td_bottom = td_top + td_height;
      var visibleTopBoundary = getScrollOffset(results);
      var results_height = $dynano(results).Height();
      var visibleBottomBoundary = visibleTopBoundary + results_height;
      var scrollTo = false;
      if ( td_top < visibleTopBoundary && step < 0 )
      {
        // going up: scroll the results div to just higher than the result we're trying to see
        scrollTo = td_top - 7;
      }
      else if ( td_bottom > visibleBottomBoundary && step > 0 )
      {
        // going down is a little harder, we want the result to be at the bottom
        scrollTo = td_top - results_height + td_height + 7;
      }
      if ( scrollTo )
      {
        results.scrollTop = scrollTo;
      }
  
      // Weird behaviour in IE
      // if (lis[active] && lis[active].scrollIntoView) {
      // 	lis[active].scrollIntoView(false);
      // }
  
    };
  
    function selectCurrent() {
      var li = $("td.row2", results)[0];
      if (!li) {
        var $li = $("td", results);
        if (options.selectOnly) {
          if ($li.length == 1) li = $li[0];
        } else if (options.selectFirst) {
          li = $li[0];
        }
      }
      if (li) {
        selectItem(li);
        return true;
      } else {
        return false;
      }
    };
  
    function selectItem(li) {
      if (!li) {
        li = document.createElement("li");
        li.extra = [];
        li.selectValue = "";
      }
      var v = $.trim(li.selectValue ? li.selectValue : li.innerHTML);
      input.lastSelected = v;
      prev = v;
      $results.html("");
      $input.val(v);
      hideResultsNow();
      if (options.onItemSelect) {
        setTimeout(function() { options.onItemSelect(li) }, 1);
      }
    };
  
    // selects a portion of the input string
    function createSelection(start, end){
      // get a reference to the input element
      var field = $input.get(0);
      if( field.createTextRange ){
        var selRange = field.createTextRange();
        selRange.collapse(true);
        selRange.moveStart("character", start);
        selRange.moveEnd("character", end);
        selRange.select();
      } else if( field.setSelectionRange ){
        field.setSelectionRange(start, end);
      } else {
        if( field.selectionStart ){
          field.selectionStart = start;
          field.selectionEnd = end;
        }
      }
      field.focus();
    };
  
    // fills in the input box w/the first match (assumed to be the best match)
    function autoFill(sValue){
      // if the last user key pressed was backspace, don't autofill
      if( lastKeyPressCode != 8 ){
        // fill in the value (keep the case the user has typed)
        $input.val($input.val() + sValue.substring(prev.length));
        // select the portion of the value not typed by the user (so the next character will erase)
        createSelection(prev.length, sValue.length);
      }
    };
  
    function showResults() {
      // get the position of the input field right now (in case the DOM is shifted)
      var pos = findPos(input);
      // either use the specified width, or autocalculate based on form element
      var iWidth = (options.width > 0) ? options.width : $input.width();
      // reposition
      $results.css({
        width: parseInt(iWidth) + "px",
        top: (pos.y + input.offsetHeight) + "px",
        left: pos.x + "px"
      });
      if ( !$results.is(":visible") )
      {
        $results.show("blind", {}, 200);
      }
      else
      {
        $results.show();
      }
    };
  
    function hideResults() {
      if (timeout) clearTimeout(timeout);
      timeout = setTimeout(hideResultsNow, 200);
    };
  
    function hideResultsNow() {
      if (hidingResults) {
        return;
      }
      hidingResults = true;
    
      if (timeout) {
        clearTimeout(timeout);
      }
      
      var v = $input.removeClass(options.loadingClass).val();
      
      if ($results.is(":visible")) {
        $results.hide();
      }
      
      if (options.mustMatch) {
        if (!input.lastSelected || input.lastSelected != v) {
          selectItem(null);
        }
      }
  
      hidingResults = false;
    };
  
    function receiveData(q, data) {
      if (data) {
        $input.removeClass(options.loadingClass);
        results.innerHTML = "";
  
        // if the field no longer has focus or if there are no matches, do not display the drop down
        if( !hasFocus )
        {
          return hideResultsNow();
        }
        if ( data.length == 0 && !options.showWhenNoResults )
        {
          return hideResultsNow();
        }
        hasNoResults = false;
  
        if ($.browser.msie) {
          // we put a styled iframe behind the calendar so HTML SELECT elements don't show through
          $results.append(document.createElement('iframe'));
        }
        results.appendChild(dataToDom(data));
        // autofill in the complete box w/the first match as long as the user hasn't entered in more data
        if( options.autoFill && ($input.val().toLowerCase() == q.toLowerCase()) ) autoFill(data[0][0]);
        showResults();
      } else {
        hideResultsNow();
      }
    };
  
    function parseData(data) {
      if (!data) return null;
      var parsed = parseJSON(data);
      return parsed;
    };
  
    function dataToDom(data) {
      var ul = document.createElement("table");
      $(ul).attr("border", "0").attr("cellspacing", "1").attr("cellpadding", "3");
      var num = data.length;
      
      if ( options.tableHeader )
      {
        // fails in IE6
        try
        {
          ul.innerHTML = options.tableHeader;
        }
        catch ( e ) {};
      }
      
      if ( num == 0 )
      {
        // not showing any results
        if ( options.noResultsHTML )
          ul.innerHTML += options.noResultsHTML;
        
        hasNoResults = true;
        return ul;
      }
      
      // limited results to a max number
      if( (options.maxItemsToShow > 0) && (options.maxItemsToShow < num) ) num = options.maxItemsToShow;
      
      for (var i=0; i < num; i++) {
        var row = data[i];
        if (!row) continue;
        
        if ( typeof(row[0]) != 'string' )
        {
          // last ditch resort if it's a 1.1.4 autocomplete plugin that doesn't provide an automatic result.
          // hopefully this doesn't slow it down a lot.
          for ( var i in row )
          {
            if ( i == "0" || i == 0 )
              break;
            row[0] = row[i];
            break;
          }
        }
        
        var li = document.createElement("tr");
        var td = document.createElement("td");
        td.selectValue = row[0];
        $(td).addClass('row1');
        $(td).css("font-size", "smaller");
        
        if ( options.formatItem )
        {
          td.innerHTML = options.formatItem(row, i, num);
        }
        else
        {
          td.innerHTML = row[0];
        }
        li.appendChild(td);
        ul.appendChild(li);
        
        $(td).hover(
          function() { $("tr", ul).removeClass("row2"); $(this).addClass("row2"); active = $("tr", ul).indexOf($(this).get(0)); },
          function() { $(this).removeClass("row2"); }
        ).click(function(e) { 
          e.preventDefault();
          e.stopPropagation();
          selectItem(this)
        });
      }
      
      $(ul).mousedown(function() {
        mouseDownOnSelect = true;
      }).mouseup(function() {
        mouseDownOnSelect = false;
      });
      return ul;
    };
  
    function requestData(q) {
      if (!options.matchCase) q = q.toLowerCase();
      var data = options.cacheLength ? loadFromCache(q) : null;
      // recieve the cached data
      if (data) {
        receiveData(q, data);
      // if an AJAX url has been supplied, try loading the data now
      } else if( (typeof options.url == "string") && (options.url.length > 0) ){
        $.get(makeUrl(q), function(data) {
          data = parseData(data);
          addToCache(q, data);
          receiveData(q, data);
        });
      // if there's been no data found, remove the loading class
      } else {
        $input.removeClass(options.loadingClass);
      }
    };
  
    function makeUrl(q) {
      var sep = options.url.indexOf('?') == -1 ? '?' : '&'; 
      var url = options.url + encodeURI(q);
      for (var i in options.extraParams) {
        url += "&" + i + "=" + encodeURI(options.extraParams[i]);
      }
      return url;
    };
  
    function loadFromCache(q) {
      if (!q) return null;
      if (cache.data[q]) return cache.data[q];
      if (options.matchSubset) {
        for (var i = q.length - 1; i >= options.minChars; i--) {
          var qs = q.substr(0, i);
          var c = cache.data[qs];
          if (c) {
            var csub = [];
            for (var j = 0; j < c.length; j++) {
              var x = c[j];
              var x0 = x[0];
              if (matchSubset(x0, q)) {
                csub[csub.length] = x;
              }
            }
            return csub;
          }
        }
      }
      return null;
    };
  
    function matchSubset(s, sub) {
      if (!options.matchCase) s = s.toLowerCase();
      var i = s.indexOf(sub);
      if (i == -1) return false;
      return i == 0 || options.matchContains;
    };
  
    this.flushCache = function() {
      flushCache();
    };
  
    this.setExtraParams = function(p) {
      options.extraParams = p;
    };
  
    this.findValue = function(){
      var q = $input.val();
  
      if (!options.matchCase) q = q.toLowerCase();
      var data = options.cacheLength ? loadFromCache(q) : null;
      if (data) {
        findValueCallback(q, data);
      } else if( (typeof options.url == "string") && (options.url.length > 0) ){
        $.get(makeUrl(q), function(data) {
          data = parseData(data)
          addToCache(q, data);
          findValueCallback(q, data);
        });
      } else {
        // no matches
        findValueCallback(q, null);
      }
    }
  
    function findValueCallback(q, data){
      if (data) $input.removeClass(options.loadingClass);
  
      var num = (data) ? data.length : 0;
      var li = null;
  
      for (var i=0; i < num; i++) {
        var row = data[i];
  
        if( row[0].toLowerCase() == q.toLowerCase() ){
          li = document.createElement("li");
          if (options.formatItem) {
            li.innerHTML = options.formatItem(row, i, num);
            li.selectValue = row[0];
          } else {
            li.innerHTML = row[0];
            li.selectValue = row[0];
          }
          var extra = null;
          if( row.length > 1 ){
            extra = [];
            for (var j=1; j < row.length; j++) {
              extra[extra.length] = row[j];
            }
          }
          li.extra = extra;
        }
      }
  
      if( options.onFindValue ) setTimeout(function() { options.onFindValue(li) }, 1);
    }
  
    function addToCache(q, data) {
      if (!data || !q || !options.cacheLength) return;
      if (!cache.length || cache.length > options.cacheLength) {
        flushCache();
        cache.length++;
      } else if (!cache[q]) {
        cache.length++;
      }
      cache.data[q] = data;
    };
  
    function findPos(obj) {
      var curleft = obj.offsetLeft || 0;
      var curtop = obj.offsetTop || 0;
      while (obj = obj.offsetParent) {
        curleft += obj.offsetLeft
        curtop += obj.offsetTop
      }
      return {x:curleft,y:curtop};
    }
  }
  
  jQuery.fn.autocomplete = function(url, options, data) {
    // Make sure options exists
    options = options || {};
    // Set url as option
    options.url = url;
    // set some bulk local data
    options.data = ((typeof data == "object") && (data.constructor == Array)) ? data : null;
  
    // Set default values for required options
    options = $.extend({
      inputClass: "ac_input",
      resultsClass: "ac_results",
      lineSeparator: "\n",
      cellSeparator: "|",
      minChars: 1,
      delay: 400,
      matchCase: 0,
      matchSubset: 1,
      matchContains: 0,
      cacheLength: false,
      mustMatch: 0,
      extraParams: {},
      loadingClass: "ac_loading",
      selectFirst: false,
      selectOnly: false,
      maxItemsToShow: -1,
      autoFill: false,
      showWhenNoResults: false,
      width: 0
    }, options);
    options.width = parseInt(options.width, 10);
  
    this.each(function() {
      var input = this;
      new jQuery.autocomplete(input, options);
    });
  
    // Don't break the chain
    return this;
  }
  
  jQuery.fn.autocompleteArray = function(data, options) {
    return this.autocomplete(null, options, data);
  }
  
  jQuery.fn.indexOf = function(e){
    for( var i=0; i<this.length; i++ ){
      if( this[i] == e ) return i;
    }
    return -1;
  };
  
  autofill_onload();
};

addOnloadHook(autofill_init);