var DWAlert = {
    _alert: null,
    _title: null,
    _detailLabel: null,
    _cancelButton: null,
    _confirmButton: null,
    _confirmCallBack: null,
    _animDuration: 0.3
};

/**
 * 显示弹窗
 * @param {string} titleString 
 * @param {string} detailString 
 * @param {function} confirmCallBack 
 * @param {bool} needCancel 
 * @param {float} animDuration 
 */
DWAlert.show = function (titleString = "",  detailString, confirmCallBack, needCancel = true, animDuration) {

    if (DWAlert._alert != undefined) { return; }

    DWAlert._animDuration = animDuration ? animDuration : DWAlert._animDuration;

    cc.loader.loadRes("./prefabs/DWAlert", cc.Prefab, (error, prefab) => {

        if (error) {
            cc.error(error);
            return;
        }

        var alert = cc.instantiate(prefab);
        DWAlert._alert = alert;

        // 动画
        var cbFadeOut = cc.callFunc(DWAlert.onFadeOutFinish, this);
        var cbFadeIn = cc.callFunc(DWAlert.onFadeInFinish, this);
        this.actionFadeIn = cc.sequence(cc.spawn(cc.fadeTo(DWAlert._animDuration, 255), cc.scaleTo(DWAlert._animDuration, 1.0)), cbFadeIn);
        this.actionFadeOut = cc.sequence(cc.spawn(cc.fadeTo(DWAlert._animDuration, 0), cc.scaleTo(DWAlert._animDuration, 2.0)), cbFadeOut);

        DWAlert._title = cc.find("alertBackground/titleLabel", alert);
        DWAlert._detailLabel = cc.find("alertBackground/detailLabel", alert);
        DWAlert._cancelButton = cc.find("alertBackground/cancelButton", alert);
        DWAlert._confirmButton = cc.find("alertBackground/confirmButton", alert);

        DWAlert._cancelButton.on(cc.Node.EventType.TOUCH_END, DWAlert.clickCancelButton, this);
        DWAlert._confirmButton.on(cc.Node.EventType.TOUCH_END, DWAlert.clickConfirmButton, this);

        DWAlert._alert.parent = cc.find("Canvas");

        DWAlert.startFadeIn();

        DWAlert.config(titleString,  detailString, confirmCallBack, needCancel);
    });
};


DWAlert.config = function (titleString, detailString, confirmCallBack, needCancel) {

    DWAlert._confirmCallBack = confirmCallBack || function () {};

    DWAlert._title.getComponent(cc.Label).string = titleString;

    if (detailString === undefined || detailString === null) {
        DWAlert._detailLabel.active = false;
    } else {
        DWAlert._detailLabel.active = true;
        DWAlert._detailLabel.getComponent(cc.Label).string = detailString;
    }

    if (needCancel) {
        DWAlert._cancelButton.active = true;
    } else {
        DWAlert._cancelButton.active = false;
        DWAlert._confirmButton.x = 0;
    }
};

// 显示弹窗动画
DWAlert.startFadeIn = function () {
    DWAlert._alert.position = cc.p(0, 0);
    DWAlert._alert.setScale(2);
    DWAlert._alert.opacity = 0;
    DWAlert._alert.runAction(this.actionFadeIn);
};

// 关闭弹窗动画
DWAlert.startFadeOut = function () {
    DWAlert._alert.runAction(this.actionFadeOut);
};

// 显示弹窗动画完成回调
DWAlert.onFadeInFinish = function () {

};

// 关闭弹窗动画完成回调
DWAlert.onFadeOutFinish = function () {

    DWAlert._cancelButton.off(cc.Node.EventType.TOUCH_END, DWAlert.clickCancelButton, this);
    DWAlert._confirmButton.off(cc.Node.EventType.TOUCH_END, DWAlert.clickConfirmButton, this);
    DWAlert.onDestory();
};

DWAlert.clickConfirmButton = function () {

    DWAlert._confirmCallBack();
    DWAlert.startFadeOut();
};

DWAlert.clickCancelButton = function () {
    DWAlert.startFadeOut();
};

DWAlert.onDestory = function() {
    DWAlert._alert = null;
    DWAlert._title = null;
    DWAlert._detailLabel = null;
    DWAlert._cancelButton = null;
    DWAlert._confirmButton = null;
    DWAlert._confirmCallBack = null;
    DWAlert._animDuration = 0.3;
};

module.exports = DWAlert;