/**
 * z-index在1亿层级
 * 弹出提示消息框，用于模拟阻塞操作（通过回调函数实现）
 * @class BI.Msg
 */
BI.Msg = function () {

    var messageShow, $mask, $pop;

    return {
        alert: function (title, message, callback) {
            this._show(false, title, message, callback);
        },
        confirm: function (title, message, callback) {
            this._show(true, title, message, callback);
        },
        prompt: function (title, message, value, callback, min_width) {
            // BI.Msg.prompt(title, message, value, callback, min_width);
        },
        toast: function (message, options, context) {
            options = options || {};
            context = context || BI.Widget._renderEngine.createElement("body");
            var level = options.level || "normal";
            var autoClose = BI.isNull(options.autoClose) ? true : options.autoClose;
            var toast = BI.createWidget({
                type: "bi.toast",
                cls: "bi-message-animate bi-message-leave",
                level: level,
                autoClose: autoClose,
                text: message
            });
            BI.createWidget({
                type: "bi.absolute",
                element: context,
                items: [{
                    el: toast,
                    left: "50%",
                    top: 10
                }]
            });
            toast.element.css({"margin-left": -1 * toast.element.outerWidth() / 2});
            toast.element.removeClass("bi-message-leave").addClass("bi-message-enter");

            autoClose && BI.delay(function () {
                toast.element.removeClass("bi-message-enter").addClass("bi-message-leave");
                BI.delay(function () {
                    toast.destroy();
                }, 1000);
            }, 5000);
        },
        _show: function (hasCancel, title, message, callback) {
            $mask = BI.Widget._renderEngine.createElement("<div class=\"bi-z-index-mask\">").css({
                position: "absolute",
                zIndex: BI.zIndex_tip - 2,
                top: 0,
                left: 0,
                right: 0,
                bottom: 0,
                opacity: 0.5
            }).appendTo("body");
            $pop = BI.Widget._renderEngine.createElement("<div class=\"bi-message-depend\">").css({
                position: "absolute",
                zIndex: BI.zIndex_tip - 1,
                top: 0,
                left: 0,
                right: 0,
                bottom: 0
            }).appendTo("body");
            var close = function () {
                messageShow.destroy();
                $mask.remove();
            };
            var conf = {
                element: $pop,
                type: "bi.center_adapt",
                items: [
                    {
                        type: "bi.bar_popover",
                        header: title,
                        body: {
                            type: "bi.center_adapt",
                            items: [{
                                type: "bi.label",
                                text: message
                            }]
                        },
                        footer: hasCancel ? {
                            type: "bi.right_vertical_adapt",
                            lgap: 10,
                            items: [{
                                type: "bi.button",
                                text: BI.i18nText("BI-Basic_Cancel"),
                                level: "ignore",
                                handler: function () {
                                    close();
                                    if (BI.isFunction(callback)) {
                                        callback.apply(null, [false]);
                                    }
                                }
                            }, {
                                type: "bi.button",
                                text: BI.i18nText("BI-Basic_Sure"),
                                handler: function () {
                                    close();
                                    if (BI.isFunction(callback)) {
                                        callback.apply(null, [true]);
                                    }
                                }
                            }]
                        } : {
                            type: "bi.right_vertical_adapt",
                            lgap: 10,
                            items: [{
                                type: "bi.button",
                                text: BI.i18nText("BI-Basic_OK"),
                                handler: function () {
                                    close();
                                    if (BI.isFunction(callback)) {
                                        callback.apply(null, [true]);
                                    }
                                }
                            }]
                        },
                        size: "small"
                    }
                ]
            };

            messageShow = BI.createWidget(conf);
        }
    };
}();