/*
 * Select zhangjingwei
 * Released under the MIT, BSD, and GPL Licenses.
 */
(function ($) {
 
    $.tools = $.tools || {
        version: '1.3'
    };
 
    var instances = [],
    tool = $.tools.selectinput = {
        conf: {
            offset: 0, // 弹出菜单偏移量
            trigger: false, // 默认触发
            css: {
                // ids
                root: 0,
                head: 0,
 
                // classnames
                list: 0,    // liststyle ?
                off: 0,     // 鼠标移动上的样式
                focus: 0,   // 获取焦点样式
                disabled: 0, // 禁止选择样式
                trigger: 0, // 触发后的样式
                current: 0, // 节点被选中的样式
                mouseon: 0  // 鼠标移动触发样式
            }
        }
    }
 
    function Selects(select, conf, i) {
        var self = this,
        css = conf.css,
        hid = css.head || "selhead_jQuery" + i,
        rid = css.root || "selroot_jQuery" + i,
        root = $("#" + rid),
        head = $("#" + hid),
        title,
        index,
        currentClass = css.current,
        opened,
        selstyle = select.offset(),
        fire = select.add(self);
        // 容灾处理
        if (!root.length && !head.length) {
            var body = $("body");
            index = getSelectIndex(), title = getSelectText();
 
            root = $('<ul />').css(selstyle).css({ "position": "absolute", "height": "auto" }).addClass(css.list).attr("id", rid).hide();
 
            select.find("option").each(function (i, n) {
                var val = n.value, text = n.firstChild.nodeValue || n.innerText;
                root.append("<li data-value='" + val + "' data-index='" + i + "'><a href='#'>" + text + "</a></li>")
            });
            root.find("li").eq(index).addClass(currentClass);
 
            head = $("<a />").attr("href", "#").html(title).css(selstyle).css({ "position": "absolute" }).addClass(css.off).attr("id", hid).click(function (e) {
                self.show();
                return e.preventDefault();
            }).appendTo(body);
 
            body.append(root);
 
            select.css("visibility", "hidden");
 
			$(window).resize(function () {
                var pos = select.offset();
                head.css(pos);
            });
        }
 
        if (conf.trigger) {
            self.show();
        }
 
        function onShow(ev) {
            ev.type = "onShow";
            fire.trigger(ev);
 
            // click outside select
            $(document).bind("click.sel", function (e) {
                var el = e.target;
 
                if (el != head[0]) {
                    self.hide(e);
                }
            });
        }
 
        // 选择函数
        function selected(index, e) {
            var elem = root.find("li"),
			currentElem = elem.eq(index),
			currentText = currentElem.text();
 
            elem.removeClass(css.current);
            currentElem.addClass(css.current);
            head.html(currentText);
            setSelected(index);
 
            // change
            e = e || $.Event("api");
            e.type = "change";
 
            fire.trigger(e, index);
            if (e.isDefaultPrevented()) {
                return;
            }
 
            self.hide(e);
        }
 
        /*
        * 设置selectindex
        */
        function setSelected(index) {
            select[0].selectedIndex = index;
        }
 
        /*
        * 获取选中项值
        */
        function getSelectVal() {
            return select.find("option:selected").val();
        }
 
        /*
        * 获取选中项文本
        */
        function getSelectText() {
            return select.find("option:selected").text();
        }
 
        /*
        * 获取selectindex
        */
        function getSelectIndex() {
            return select[0].selectedIndex;
        }
 
        $.extend(self, {
            show: function (e) {
                if (select.attr("disabled") || opened) {
                    return;
                }
                // onBeforeShow
                e = e || $.Event();
                e.type = "onBeforeShow";
                fire.trigger(e);
                if (e.isDefaultPrevented()) {
                    return;
                }
 
                // 关闭所有已打开select
                $.each(instances, function () {
                    this.hide();
                });
                opened = true;
 
                root.find("li").unbind("click mouseenter mouseleave").click(function (e) {
                    self.setValue($(this).index(), e);
                    return false;
                }).hover(
                    function () {
                        $(this).addClass(css.mouseon);
                    },
                    function () {
                        $(this).removeClass(css.mouseon);
                    }
                );
 
                // show select
                var pos = select.offset();
 
                // iPad position fix
                if (/iPad/i.test(navigator.userAgent)) {
                    pos.top -= $(window).scrollTop();
                }
 
                if (conf.offset) {
                    root.css({
                        top: pos.top + conf.offset[0],
                        left: pos.left + conf.offset[1]
                    });
                }
 
                root.show();
                onShow(e);
 
                return self;
            },
            hide: function (e, slis) {
                if (opened) {
                    // onHide
                    e = $.Event();
                    e.type = "onHide";
                    fire.trigger(e);
 
                    $(document).unbind("click.sel").unbind("keydown.sel");
 
                    // cancelled ?
                    if (e.isDefaultPrevented()) {
                        return;
                    }
 
                    // do the hide
                    root.hide();
                    root.find("li").unbind("click");
                    opened = false;
                }
 
                return self;
            },
            setValue: function (index, evt) {
                evt = evt || $.Event("api");
                selected(index, evt, conf);
                return self;
            },
            reflow: function () {
                var pos = select.offset(),
				headelem = select.data("selectinput");
 
                if (headelem) {
                    head.css({ top: pos.top, left: pos.left });
                }
                return self;
            },
            getConf: function () {
                return conf;
            },
            getRoot: function () {
                return root;
            },
            getHead: function () {
                return head;
            },
            getSelect: function () {
                return select;
            },
            isOpen: function () {
                return opened;
            }
        });
 
        // callbacks
        $.each(['onBeforeShow', 'onShow', 'change', 'onHide'], function (i, name) {
 
            // configuration
            if ($.isFunction(conf[name])) {
                $(self).bind(name, conf[name]);
            }
 
            // API methods
            self[name] = function (fn) {
                if (fn) {
                    $(self).bind(name, fn);
                }
                return self;
            };
        });
    }
 
    $.fn.selectinput = function (conf) {
 
        // 单例
        if (this.data("selectinput")) {
            return this;
        }
 
        //
        conf = $.extend(true, {}, tool.conf, conf);
 
        var els;
 
        this.each(function (key) {
            var el = new Selects($(this), conf, $.now() + key);
            instances.push(el);
            var sel = el.getSelect().data("selectinput", el);
            els = els ? els.add(sel) : sel;
        });
        return els ? els : this;
    };
})(jQuery);