(function () {
    function isVertical(position) {
        return position === "top" || position === "bottom";
    }

    /**
     * 文字类型的按钮
     * @class BI.Button
     * @extends BI.BasicButton
     *
     * @cfg {JSON} options 配置属性
     * @cfg {'common'/'success'/'warning'/'ignore'} [options.level='common'] 按钮类型，用不同颜色强调不同的场景
     */
    BI.Button = BI.inherit(BI.BasicButton, {

        _const: {
            iconWidth: 18
        },

        _defaultConfig: function (props) {
            var conf = BI.Button.superclass._defaultConfig.apply(this, arguments);

            var adaptiveHeight = 0;
            if (isVertical(props.iconPosition)) {
                // 图标高度和文字高度默认相等
                adaptiveHeight += (props.textHeight || 16) * 2;
                adaptiveHeight += props.iconGap || 0;
                var tGap = props.tgap || props.vgap || 2;
                var bGap = props.bgap || props.vgap || 2;
                adaptiveHeight += (tGap + bGap);
            }

            return BI.extend(conf, {
                baseCls: (conf.baseCls || "") + " bi-button" + ((BI.isIE() && BI.isIE9Below()) ? " hack" : ""),
                attributes: {
                    tabIndex: 1
                },
                minWidth: (props.block === true || props.clear === true) ? 0 : 80,
                height: isVertical(props.iconPosition) ? adaptiveHeight : 24,
                shadow: props.clear !== true,
                isShadowShowingOnSelected: true,
                readonly: true,
                iconCls: "",
                level: "common",
                block: false, // 是否块状显示，即不显示边框，没有最小宽度的限制
                clear: false, // 是否去掉边框和背景
                ghost: false, // 是否幽灵显示, 即正常状态无背景
                loading: false, // 是否处于加载中
                light: false, // 是否使用浅色
                plain: false, // 是否是朴素按钮，和 clear 的区别是 plain 有悬浮效果
                textAlign: "center",
                whiteSpace: "nowrap",
                textWidth: null,
                textHeight: null,
                hgap: props.clear ? 0 : 10,
                vgap: 0,
                tgap: 0,
                bgap: 0,
                lgap: 0,
                rgap: 0,
                iconGap: 0,
                iconPosition: "left"
            });
        },

        render: function () {
            var o = this.options;

            // 由于button默认情况下有个边框，所以要主动算行高
            var lineHeight, textHeight = o.textHeight;
            if (BI.isNumber(o.height)) {
                if (!isVertical(o.iconPosition)) {
                    if (o.clear || o.block || o.light) {
                        lineHeight = o.height;
                    } else {
                        lineHeight = o.height - 2;
                    }
                } else {
                    lineHeight = textHeight;
                }
            }
            if (!textHeight) {
                if (o.whiteSpace === "nowrap") {
                    textHeight = lineHeight;
                }
            }
            if (BI.isKey(o.iconCls)) {
                this.icon = BI.createWidget({
                    type: "bi.icon_label",
                    cls: o.iconCls,
                    width: this._const.iconWidth,
                    height: lineHeight,
                    lineHeight: lineHeight,
                    // 不设置，自定义按钮无法居中
                    iconWidth: o.iconWidth,
                    iconHeight: o.iconHeight
                });
                this.text = BI.createWidget({
                    type: "bi.label",
                    text: o.text,
                    textWidth: BI.isNotNull(o.textWidth) ? o.textWidth - this._const.iconWidth : null,
                    textHeight: textHeight,
                    height: lineHeight,
                    value: o.value
                });
                var layoutType = "bi.horizontal";
                var gapContainer = {
                    lgap: o.iconPosition === "left" && o.text ? o.iconGap : 0,
                    rgap: o.iconPosition === "right" ? o.iconGap : 0,
                    tgap: o.iconPosition === "top" ? o.iconGap : 0,
                    bgap: o.iconPosition === "bottom" ? o.iconGap : 0
                };
                var items = [this.icon, BI.extend({el: this.text}, gapContainer)];
                if (isVertical(o.iconPosition)) {
                    layoutType = "bi.vertical";
                }
                if (o.iconPosition === "right" || o.iconPosition === "bottom") {
                    items = [BI.extend({el: this.text}, gapContainer), this.icon];
                }
                BI.createWidget({
                    type: "bi.center_adapt",
                    element: this,
                    hgap: o.hgap,
                    vgap: o.vgap,
                    items: [{
                        type: layoutType,
                        horizontalAlign: "center",
                        verticalAlign: "middle",
                        items: items
                    }]
                });
            } else {
                this.text = BI.createWidget({
                    type: "bi.label",
                    height: o.height,
                    textAlign: o.textAlign,
                    whiteSpace: o.whiteSpace,
                    textWidth: o.textWidth,
                    textHeight: textHeight,
                    hgap: o.hgap,
                    vgap: o.vgap,
                    tgap: o.tgap,
                    bgap: o.bgap,
                    lgap: o.lgap,
                    rgap: o.rgap,
                    element: this,
                    text: o.text,
                    value: o.value
                });
            }
            if (o.block === true) {
                this.element.addClass("block");
            }
            if (o.clear === true) {
                this.element.addClass("clear");
            }
            if (o.ghost === true) {
                this.element.addClass("ghost");
            }
            if (o.plain === true) {
                this.element.addClass("plain");
            }
            if (o.loading === true) {
                this.element.addClass("loading");
            }
            if (o.light === true) {
                this.element.addClass("light");
            }
            if (o.minWidth > 0) {
                this.element.css({"min-width": o.minWidth / BI.pixRatio + BI.pixUnit});
            }
        },

        doClick: function () {
            BI.Button.superclass.doClick.apply(this, arguments);
            if (this.isValid()) {
                this.fireEvent(BI.Button.EVENT_CHANGE, this);
            }
        },

        _setEnable: function (enable) {
            BI.Button.superclass._setEnable.apply(this, arguments);
            if (enable === true) {
                this.element.attr("tabIndex", 1);
            } else if (enable === false) {
                this.element.removeAttr("tabIndex");
            }
        },

        setLoading: function (loading) {
            if (loading) {
                this.element.addClass("loading");
            } else {
                this.element.removeClass("loading");
            }
        },

        setText: function (text) {
            BI.Button.superclass.setText.apply(this, arguments);
            this.text.setText(text);
        },

        setValue: function (text) {
            BI.Button.superclass.setValue.apply(this, arguments);
            if (!this.isReadOnly()) {
                this.text.setValue(text);
            }
        },

        setIcon: function (cls) {
            var o = this.options;
            if (this.icon && o.iconCls !== cls) {
                this.icon.element.removeClass(o.iconCls).addClass(cls);
                o.iconCls = cls;
            }
        },

        doRedMark: function () {
            this.text.doRedMark.apply(this.text, arguments);
        },

        unRedMark: function () {
            this.text.unRedMark.apply(this.text, arguments);
        },

        doHighLight: function () {
            this.text.doHighLight.apply(this.text, arguments);
        },

        unHighLight: function () {
            this.text.unHighLight.apply(this.text, arguments);
        }
    });
    BI.shortcut("bi.button", BI.Button);
    BI.Button.EVENT_CHANGE = "EVENT_CHANGE";
}());