/* jQuery Autocomplete
 * Version 1.0
 * Written by Yehuda Katz (wycats@gmail.com) and Rein Henrichs (reinh@reinh.com)
 * @requires jQuery v1.2, jQuery dimensions plugin
 *
 * Copyright 2007 Yehuda Katz, Rein Henrichs
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 */

/*
 * @description Form autocomplete plugin using preloaded or Ajax JSON data source
 *
 * @example $('input#user-name').autocomplete({list: ["quentin", "adam", "admin"]})
 * @desc Simple autocomplete with basic JSON data source
 *
 * @example $('input#user-name').autocomplete({ajax: "/usernames.js"})
 * @desc Simple autocomplete with Ajax loaded JSON data source
 *
 */


(function($) {

  $.ui = $.ui || {}; $.ui.autocomplete = $.ui.autocomplete || {}; var active;

  var KEY = {
    ESC: 27,
    RETURN: 13,
    TAB: 9,
    BS: 8,
    DEL: 46,
    UP: 38,
    DOWN: 40
  };

  $.fn.autocompleteMode = function(container, input, size, opt) {
    var original = input.val(); var selected = -1; var self = this;

    $.data(document.body, "autocompleteMode", true);

    $("body").one("cancel.autocomplete", function() {
      input.trigger("cancel.autocomplete"); $("body").trigger("off.autocomplete"); input.val(original);
    });

    $("body").one("activate.autocomplete", function() {
      // Try hitting return to activate autocomplete and then hitting it again on blank input
      // to close it.  w/o checking the active object first this input.trigger() will barf.
      active && input.trigger("activate.autocomplete", [$.data(active[0], "originalObject")]);
      $("body").trigger("off.autocomplete");
    });

    $("body").one("off.autocomplete", function(e, reset) {
      container.remove();
      $.data(document.body, "autocompleteMode", false);
      input.unbind("keydown.autocomplete");
      $("body").add(window).unbind("click.autocomplete").unbind("cancel.autocomplete").unbind("activate.autocomplete");
    });

    // If a click bubbles all the way up to the window, close the autocomplete
    $(window).bind("click.autocomplete", function() { $("body").trigger("cancel.autocomplete"); });

    var select = function() {
      active = $("> *", container).removeClass("active").slice(selected, selected + 1).addClass("active");
      input.trigger("itemSelected.autocomplete", [$.data(active[0], "originalObject")]);
      input.val(opt.insertText($.data(active[0], "originalObject")));
    };

    container.mouseover(function(e) {
      // If you hover over the container, but not its children, return
      if(e.target == container[0]) return;
      // Set the selected item to the item hovered over and make it active
      selected = $("> *", container).index($(e.target).is('li') ? $(e.target)[0] : $(e.target).parents('li')[0]); select();
    }).bind("click.autocomplete", function(e) {
      $("body").trigger("activate.autocomplete"); $.data(document.body, "suppressKey", false);
    });

    input
      .bind("keydown.autocomplete", function(e) {
        var k = e.which || e.keyCode; // in IE e.which is undefined

        if(k == KEY.ESC) { $("body").trigger("cancel.autocomplete"); }
        else if(k == KEY.RETURN) { $("body").trigger("activate.autocomplete"); }
        else if(k == KEY.UP || k == KEY.TAB || k == KEY.DOWN) {
          switch(k) {
            case KEY.DOWN:
            case KEY.TAB:
              selected = selected >= size - 1 ? 0 : selected + 1; break;
            case KEY.UP:
              selected = selected <= 0 ? size - 1 : selected - 1; break;
            default: break;
          }
          select();
        } else { return true; }
        $.data(document.body, "suppressKey", true);
      });
  };

  $.fn.autocomplete = function(opt) {

    opt = $.extend({}, {
      timeout: 1000,
      getList: function(input) { input.trigger("updateList", [opt.list]); },
      template: function(str) { return "<li>" + opt.insertText(str) + "</li>"; },
      insertText: function(str) { return str; },
      match: function(typed) { return this.match(new RegExp(typed)); },
      wrapper: "<ul class='jq-ui-autocomplete'></ul>"
    }, opt);

    if($.ui.autocomplete.ext) {
      for(var ext in $.ui.autocomplete.ext) {
        if(opt[ext]) {
          opt = $.extend(opt, $.ui.autocomplete.ext[ext](opt));
          delete opt[ext];
        }
    } }

    function preventTabInAutocompleteMode(e) {
      var k = e.which || e.keycode;
      if ($.data(document.body, "autocompleteMode") && k == KEY.TAB) {
        e.preventDefault();
      }
    }
    function startTypingTimeout(e) {
      $.data(this, "typingTimeout", window.setTimeout(function() {
        $(e.target || e.srcElement).trigger("autocomplete");
      }, opt.timeout));
    }

    return this.each(function() {
      $(this)
        .keydown(function(e) {
          preventTabInAutocompleteMode(e);
        })
        .keyup(function(e) {
          var k = e.which || e.keycode;
          if (!$.data(document.body, "autocompleteMode") &&
              (k == KEY.UP || k == KEY.DOWN) &&
              !$.data(this, "typingTimeout")) {
            startTypingTimeout(e);
          }
          else {
            preventTabInAutocompleteMode(e);
          }
        })
        .keypress(function(e) {
          var typingTimeout = $.data(this, "typingTimeout");
          var k = e.keyCode || e.which; // keyCode == 0 in Gecko/FF on keypress
          if(typingTimeout) window.clearInterval(typingTimeout);

          if($.data(document.body, "suppressKey"))
            return $.data(document.body, "suppressKey", false);
          else if($.data(document.body, "autocompleteMode") && k < 32 && k != KEY.BS && k != KEY.DEL) return false;
          else if (k > 32) { // more than ESC and RETURN and the like
            startTypingTimeout(e);
          }
        })
        .bind("autocomplete", function() {
          var self = $(this);

          self.one("updateList", function(e, list) {
            list = $(list)
              .filter(function() { return opt.match.call(this, self.val()); })
              .map(function() {
                var node = $(opt.template(this))[0];
                $.data(node, "originalObject", this);
                return node;
              });

            $("body").trigger("off.autocomplete");

            if(!list.length) return false;

            var container = list.wrapAll(opt.wrapper).parents(":last").children();
            // IE seems to wrap the wrapper in a random div wrapper so
            // drill down to the node in opt.wrapper.
            var wrapper_tagName = $(opt.wrapper)[0].tagName;
            for (;container[0].tagName !== wrapper_tagName; container = container.children(':first')) {}

            var offset = self.offset();

            opt.container = container
              .css({top: offset.top + self.outerHeight(), left: offset.left, width: self.width()})
              .appendTo("body");

            $("body").autocompleteMode(container, self, list.length, opt);
          });

          opt.getList(self);
        });

    });
  };

})(jQuery);