/**
 * jQuery jEC (jQuery Editable Combobox) 0.4.0
 * http://code.google.com/p/jquery-jec
 * http://plugins.jquery.com/project/jEC
 *
 * Copyright (c) 2008 Lukasz Rajchel (lukasz@rajchel.pl | http://lukasz.rajchel.pl)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * Documentation	:	http://code.google.com/p/jquery-jec/wiki/Documentation
 * Changelog:		:	http://code.google.com/p/jquery-jec/wiki/Changelog
 */

(function($) {

 	// register new jQuery function
	$.fn.editableCombobox = function(options) {

		// default options
		var defaults = {
			position: 0,
			classes: '',
			styles: {},
			pluginClass: 'jecEditableOption',
			ignoredKeys: [],
			acceptedRanges: [
				{min:32, max:126},	// standard chars
				{min:191, max:382}	// latin accented chars
			]
		
			
		};

		// options
		var options = $.extend(defaults, options);

		// IE doesn't implement indexOf() method
		if ($.browser.msie) {
			Array.prototype.indexOf = function(object) {
			
				for (var i = 0; i < this.length; i++) {
					if (this[i] == object) {
						return i;
					}
				}
				return -1;
			}
		}

		return $(this).filter('select').each(function() {

			// add editable option tag if not exists
			if ($(this).children(options.pluginClass).length == 0) {
				var editableOption = $(document.createElement('option'));
				editableOption.addClass(options.pluginClass).hide();

				// add passed CSS classes
				if (typeof(options.classes) == 'string') {
					editableOption.addClass(options.classes);
				} else if (typeof(options.classes) == 'object') {
					for (var i = 0; i < options.classes.length; i++) {
						editableOption.addClass(options.classes[i]);
					}
				}

				// add passed CSS styles
				if (typeof(options.styles) == 'object') {
					for (var i = 0; i < options.styles.length; i++) {
						editableOption.append(options.styles[i]);
					}
				}

				// insert created element on correct position
				if ($(this).children().eq(options.position).length != 0) {
					$(this).children().eq(options.position).before(editableOption);
				} else {
					$(this).append(editableOption);
				}
			}

			// handle keys pressed on select
			$(this).keypress(function(event) {

				switch(event.which) {
					case 8:	// backspace
						var option = $(this).children('option.' + options.pluginClass);
						if (option.val().length > 1) {
							// remove selection from all options
							$(this).children(':selected').removeAttr('selected');

							// remove last character
							var value = option.val().substring(0, option.val().length - 1);
							option.val(value).text(value).attr('selected', 'selected').show();
						} else if (option.val().length == 1) {
							option.val('').text('').hide();
						}
						break;
					default:
						// don't handle ignored keys
						if (options.ignoredKeys.indexOf(event.which) == -1) {
							// remove selection from all options
							$(this).children(':selected').removeAttr('selected');
							
							keyValue = '';
							// iterate through valid ranges
							for each (validKey in options.acceptedRanges) {
								// the range can be either a min,max tuple or exact value
								if((typeof(validKey.exact) != 'undefined' && validKey.exact == event.which) || (typeof(validKey.min) != 'undefined' && typeof(validKey.max) != 'undefined' && event.which >= validKey.min && event.which <= validKey.max)) {
									keyValue = String.fromCharCode(event.which);
								}
							}

							// add key value to proper option tag
							var option = $(this).children('option.' + options.pluginClass);
							var value = option.val() + keyValue;
							option.val(value).text(value).attr('selected', 'selected').show();
						}
						break;
				}
			});

			// disable browser-history-back on backspace
			$(this).keydown(function(event) {
			
				return (event.which != 8);
			});
		});
	};

})(jQuery);