/**
* 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: '/img/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) {
                    var pos = e.pageY - btn.offset().top;
                    var vector = (btn.height() / 2 > pos ? 1 : -1);
                    (function() {
                        spin(vector);
                        var tk = setTimeout(arguments.callee, opt.timeInterval);
                        $(document).one('mouseup', function() {
                            clearTimeout(tk); btn.attr('src', spinBtnImage);
                        });
                    })();
                    return false;
                });
            });
        }
    });
})(jQuery);