/**
 * jQuery Spin 1.1.1
 *
 * Copyright (c) 2009 Naohiko MORI
 * Dual licensed under the MIT and GPL licenses.
 *
 **/
(function($){
    var calcFloat = {
        get: function(num){
            var num = num.toString();
            if(num.indexOf('.')==-1) return[0, eval(num)];
            var nn = num.split('.');
            var po = nn[1].length;
            var st = nn.join('');
            var sign = '';
            if(st.charAt(0)=='-'){
                st = st.substr(1);
                sign = '-';
            }
            for(var i=0; i<st.length; ++i) if(st.charAt(0)=='0') st=st.substr(1, st.length);
            st = sign + st;
            return [po, eval(st)];
        },
        getInt: function(num, figure){
            var d = Math.pow(10, figure);
            var n = this.get(num);
            var v1 = eval('num * d');
            var v2 = eval('n[1] * d');
            if(this.get(v1)[1]==v2) return v1;
            return(n[0]==0 ? v1 : eval(v2 + '/Math.pow(10, n[0])'));
        },
        sum: function(v1, v2){
            var n1 = this.get(v1);
            var n2 = this.get(v2);
            var figure = (n1[0] > n2[0] ? n1[0] : n2[0]);
            v1 = this.getInt(v1, figure);
            v2 = this.getInt(v2, figure);
            return eval('v1 + v2')/Math.pow(10, figure);
        }
    };
    $.extend({
        spin: {
            imageBasePath: '/source/images/spin/',
            spinBtnImage: 'spin-button.png',
            spinUpImage: 'spin-up.png',
            spinDownImage: 'spin-down.png',
            interval: 1,
            max: null,
            min: null,
            timeInterval: 500,
            timeBlink: 200,
            btnClass: null,
            btnCss: {
                cursor: 'pointer',
                padding: 0,
                margin: 0,
                verticalAlign: 'middle'
            },
            txtCss: {
                marginRight: 0,
                paddingRight: 0
            },
            lock: false,
            decimal: null,
            beforeChange: null,
            changed: null,
            buttonUp: null,
            buttonDown: null
        }
    });
    $.fn.extend({
        spin: function(o){
            return this.each(function(){
                o = o || {};
                var opt = {};
                $.each($.spin, function(k,v){
                    opt[k] = (typeof o[k]!='undefined' ? o[k] : v);
                });
        
                var txt = $(this);
        
                var spinBtnImage = opt.imageBasePath+opt.spinBtnImage;
                var btnSpin = new Image();
                btnSpin.src = spinBtnImage;
                var spinUpImage = opt.imageBasePath+opt.spinUpImage;
                var btnSpinUp = new Image();
                btnSpinUp.src = spinUpImage;
                var spinDownImage = opt.imageBasePath+opt.spinDownImage;
                var btnSpinDown = new Image();
                btnSpinDown.src = spinDownImage;
        
                var btn = $(document.createElement('img'));
                btn.attr('src', spinBtnImage);
                if(opt.btnClass) btn.addClass(opt.btnClass);
                if(opt.btnCss) btn.css(opt.btnCss);
                if(opt.txtCss) txt.css(opt.txtCss);
                txt.after(btn);
                if(opt.lock){
                    txt.focus(function(){
                        txt.blur();
                    });
                }
        
                function spin(vector){
                    var val = txt.val();
                    var org_val = val;
                    if(opt.decimal) val=val.replace(opt.decimal, '.');
                    if(!isNaN(val)){
                        val = calcFloat.sum(val, vector * opt.interval);
                        if(opt.min!==null && val<opt.min) val=opt.min;
                        if(opt.max!==null && val>opt.max) val=opt.max;
                        if(val != txt.val()){
                            if(opt.decimal) val=val.toString().replace('.', opt.decimal);
                            var ret = ($.isFunction(opt.beforeChange) ? opt.beforeChange.apply(txt, [val, org_val]) : true);
                            if(ret!==false){
                                txt.val(val);
                                if($.isFunction(opt.changed)) opt.changed.apply(txt, [val]);
                                txt.change();
                                src = (vector > 0 ? spinUpImage : spinDownImage);
                                btn.attr('src', src);                                
                                if(opt.timeBlink<opt.timeInterval)
                                    setTimeout(function(){
                                        btn.attr('src', spinBtnImage);
                                    }, opt.timeBlink);
                            }
                        }
                    }
                    if(vector > 0){
                        if($.isFunction(opt.buttonUp)) opt.buttonUp.apply(txt, [val]);
                    }else{
                        if($.isFunction(opt.buttonDown)) opt.buttonDown.apply(txt, [val]);
                    }
                }
        
                btn.mousedown(function(e,customVector){
                    var vector = customVector;
                    if (vector == undefined) {
                        var pos = e.pageY - btn.offset().top;
                        vector = (btn.height()/2 > pos ? 1 : -1);
                    }
                    (function(){                        
                        spin(vector);
                        var tk = setTimeout(arguments.callee, opt.timeInterval);
                        if (customVector == undefined) {
                            $(document).one('mouseup', function(){
                                clearTimeout(tk);
                                btn.attr('src', spinBtnImage);
                            });
                        } else {
                            clearTimeout(tk);
                        }
                    })();
                    return false;
                });
            });
        }
    });
})(jQuery);