/**
 * idcode 1.0 - validate user.
 * version 1.0
 * @requires jquery v1.2
 * author ehong[idehong@gmail.com]
 **/

/**
 * @example: $.idcode.setcode();	
 * @desc: make a validate code append to the element that id is idcode.
 *
 * @example $.idcode.validatecode();	
 * @desc return true if user input value equal idcode. 
 **/
 
(function($){
	var settings = {
			e	 		: 'idcode',
			codetype 	: { name : 'follow', len: 5},//len是修改验证码长度的
			codetip		: '换一张?',
			inputid		: 'txtidcode'//验证元素的id
		};
	
	var _set = {
		storelable  : 'codeval',
		store		: '#ehong-code-input',
		codeval		: '#ehong-code'
	}
	$.idcode = {
		getcode:function(option){
			_commsetting(option);
			return _storedata(_set.storelable, null);
		},
		setcode:function(option){
			_commsetting(option);
			_setcodestyle("#"+settings.e, settings.codetype.name, settings.codetype.len);
			
		},
		validatecode:function(option){
			_commsetting(option);
			var inputv;
			if(settings.inputid){
				inputv=$('#' + settings.inputid).val();
			}else{
				inputv=$(_set.store).val();
			}	
			if(inputv.touppercase() == _storedata(_set.storelable, null).touppercase()){//修改的不区分大小写
				return true;
			}else{
				_setcodestyle("#"+settings.e, settings.codetype.name, settings.codetype.len);				
				return false;
			}
		}
	};
	
	function _commsetting(option){
		$.extend(settings, option);		
	}
	
	function _storedata(datalabel, data){
		var store = $(_set.codeval).get(0);			
		if(data){
			$.data(store, datalabel, data);			
		}else{
			return $.data(store, datalabel);			
		}
	}
	
	function _setcodestyle(eid, codetype, codelength){
		var codeobj = _createcode(settings.codetype.name, settings.codetype.len);		
		var randnum = math.floor(math.random()*6);
		var htmlcode=''
		if(!settings.inputid){
			htmlcode='<span><input id="ehong-code-input" type="text" maxlength="4" /></span>';
		}
		htmlcode+='<div id="ehong-code" class="ehong-idcode-val ehong-idcode-val';
		htmlcode+=string(randnum);
		htmlcode+='" href="#" onblur="return false" onfocus="return false" oncontextmenu="return false" onclick="$.idcode.setcode()">' + _setstyle(codeobj) + '</div>' + '<span id="ehong-code-tip-ck" class="ehong-code-val-tip" onclick="$.idcode.setcode()">'+ settings.codetip +'</span>';
		$(eid).html(htmlcode);
		_storedata(_set.storelable, codeobj);		
	}
	
	function _setstyle(codeobj){
		var fncodeobj = new array();
		var col = new array('#bf0c43', '#e69a2a','#707f02','#18975f','#bc3087','#73c841','#780320','#90719b','#1f72d8','#d6a03c','#6b486e','#243f5f','#16bdb5');
		var charindex;
	   	for(var i=0;i<codeobj.length;i++){		
			charindex = math.floor(math.random()*col.length);
			fncodeobj.push('<font color="' + col[charindex] + '">' + codeobj.charat(i) + '</font>');
		}
		return fncodeobj.join('');		
	}
	function _createcode(codetype, codelength){
	   var codeobj;
	   if(codetype=='follow'){
		   codeobj = _createcodefollow(codelength);
	   }else if(codetype=='calc'){
		   codeobj = _createcodecalc(codelength);
	   }else{
		   codeobj="";
	   }
	   return codeobj;   
	 }
	 
	 function _createcodecalc(codelength){
	   var code1, code2, coderesult;
	   var selectchar = new array('0','1','2','3','4','5','6','7','8','9');	
	   var charindex;
	   for(var i=0;i<codelength;i++){		
		   charindex = math.floor(math.random()*selectchar.length);
		   code1 +=selectchar[charindex];
		   
		   charindex = math.floor(math.random()*selectchar.length);
		   code2 +=selectchar[charindex];		   
	   }
	   return [parseint(code1), parseint(code2) , parseint(code1) + parseint(code2)] ;
	 }
	 
	 function _createcodefollow(codelength){
	   var code = "";
	   var selectchar = new array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z');
		
	   for(var i=0;i<codelength;i++){		
		   var charindex = math.floor(math.random()*selectchar.length);
		   if(charindex % 2 == 0){
			   code+=selectchar[charindex].tolowercase();
		   }else{
			   code +=selectchar[charindex];
		   }	   
	   }
	   return code;
	 }
   
})(jquery);