/* Copyright (c) 2010 Mustafa OZCAN (http://www.mustafaozcan.net)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* Version: 1.1
* Requires: jquery.1.2.6+
*/
(function($) {
    $.fn.bestupper = function(settings) {
        var defaults = {
            ln: 'en', // language : tr for Turkish or en for English
            clear: true //if it is true clear whitespace on blur event
        }, settings = $.extend({}, defaults, settings);
        this.each(function() {
            var $this = $(this);
            if ($this.is('textarea') || $this.is('input:text')) { // check element type
                $this.keypress(function(e) {
                    var pressedKey = e.charCode == undefined ? e.keyCode : e.charCode;
                    var str = String.fromCharCode(pressedKey);
					var actualLength = $this.val().length;
					var maxLength =  $this.attr('maxlength');
					var startpos = this.selectionStart;
					var endpos = this.selectionEnd;
					
					//alert(maxLength);
					if(maxLength >-1 && actualLength >= maxLength) //Check maxlength
					{
						if(endpos - startpos > 0 ) 
						{	if(!isInactive(pressedKey, e))
							{							
								this.value=this.value.substr(0, startpos) + this.value.substr(endpos);
								this.setSelectionRange(startpos  , startpos );
							}
						}
						else
						{
							if(isInactive(pressedKey, e)) return;
							else return false;
						}
					}
			
					if (pressedKey < 97 || pressedKey > 122) {
						if (settings.ln == 'en' || !isTRChar(pressedKey))
							return;
					}
					if (settings.ln == 'tr' && pressedKey == 105)
						str = '\u0130'; // for Turkish lowercase - uppercase 'i' because lowercase 'i' is not equal to uppercase 'I'
					if (this.createTextRange) { //IE
						window.event.keyCode = str.toUpperCase().charCodeAt(0);
						return;
					}
					else { //FF or Google Chrome
						this.value = this.value.substr(0, startpos) + str.toUpperCase() + this.value.substr(endpos);
						this.setSelectionRange(startpos + 1, startpos + 1);
						return false;
					}
					
                });
                if (settings.clear) {
                    $this.blur(function(e) {
						var actualLength = $this.val().length;
						var maxLength = $this.attr('maxlength');
						if(maxLength > -1 && actualLength >= maxLength) this.value = this.value.substr(0,maxLength); 
					
                        if (settings.ln == 'tr')
                            this.value = this.value.replace(/i/g, "\u0130"); //Turkish 'i'
                        this.value = this.value.replace(/^\s+|\s+$/g, "").replace(/\s{2,}/g, " ").toUpperCase(); // clean whitespaces
                    });
                }
            }
        });
    };
    function isTRChar(key) {
        var trchar = [231, 246, 252, 287, 305, 351];
        for (var i = 0; i < trchar.length; i++) {
            if (trchar[i] == key)
                return true;
        }
        return false;
    }
	function isInactive(key,e) {
		if (key==0) key = e.keyCode;
        var ArrowAndDelChar = [8, 9, 37, 38, 39, 40, 45, 46];
        for (var i = 0; i < ArrowAndDelChar.length; i++) {
            if (ArrowAndDelChar[i] == key)
                return true;
        }
        return false;
    }
})(jQuery);