export default class ScreenAdaptMgr {
    private static isMobile: boolean = false;
    private static isTablet: boolean = false;
    private static isPc: boolean = false;

    public static initAdapt() {
        this.adapt()
        cc.director.on(cc.Director.EVENT_AFTER_SCENE_LAUNCH, () => {
            this.adapt()
        })
    }
    /**适配屏幕 */
    public static adapt() {
        let bgNode = this.getBgNode(cc.Canvas.instance.node);

        //当前屏幕实际大小 cc.winSize(W为Fit适配缩放后的大小)
        let frameSize = cc.view.getFrameSize();
        let screenRatio = frameSize.width / frameSize.height;
        //设计比例
        let designRatio = cc.Canvas.instance.designResolution.width / cc.Canvas.instance.designResolution.height;
        //判断屏幕宽高比
        if (screenRatio <= 1) {
            //此屏幕高度大于宽度
            if (screenRatio <= designRatio) {
                this.setFitWidth();
                bgNode.scaleY = cc.winSize.height / bgNode.height
            } else {
                //此时屏幕比例大于设计比例
                //为了保证纵向的游戏内容不受影响，应该使用fitHeight模式
                this.setFitHeight();
                bgNode.scaleX = cc.winSize.width / bgNode.width;
            }
        } else {
            this.setFitWidth();
            bgNode.scaleY = cc.winSize.height / bgNode.height
        }
    }
    private static setFitHeight() {
        cc.Canvas.instance.fitHeight = true;
        cc.Canvas.instance.fitWidth = false;
    }
    private static setFitWidth() {
        cc.Canvas.instance.fitHeight = false;
        cc.Canvas.instance.fitWidth = true;
    }

    /**返回上层的bg节点 */
    private static getBgNode(preNode: cc.Node): cc.Node {
        let name = preNode.name.toLocaleLowerCase()
        if (name === 'bg' || name === 'background') {
            return preNode
        }
        let len = preNode.childrenCount
        for (let index = 0; index < len; index++) {
            const result = this.getBgNode(preNode.children[index]);
            if (result) {
                return result
            }
        }
    }

    //#region ljc 长短屏手机判断（比较特殊，正常判断是否大于0.5，这里网页端会裁切下半部分所以取1）
    public static IsShortScreen(): boolean {
        let deviceSize = cc.view.getFrameSize();
        return (deviceSize.width / deviceSize.height >= 1)
    }
    //#endregion

    //#region ljc 系统判断
    public static IsAndroid() {
        if (0 == this.getOSType()) {
            return true
        } else {
            return false
        }
    }
    public static IsIOS() {
        if (1 == this.getOSType()) {
            return true
        } else {
            return false
        }
    }
    /**
     * 获取操作系统类型:
     * 0-Android
     * 1-iOS
     * @returns 
     */
    private static getOSType() {
        if (/(Android)/i.test(navigator.userAgent)) {
            // console.log("ljc - js判断系统: 安卓");
            return 0;
        } else if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) {
            // console.log("ljc - js判断系统: 苹果");
            return 1;
        } else {
            return 2;
        }
    }
    //#endregion

    //#region ljc 平台判断
    public static IsMobile() {
        if (this.isMobile == true) {
            return this.isMobile;
        } else {
            this.PlatformTest()
            return this.isMobile;
        }
    }
    /**横屏状态 */
    public static IsLandscape() {
        //横屏状态！
        return (window.orientation == 90 || window.orientation == -90)
    }
    /**竖屏状态 */
    public static IsPortrait() {
        //竖屏状态！
        return (window.orientation == 180 || window.orientation == 0)
    }
    public static IsTablet() {
        if (this.isTablet == true) {
            return this.isTablet;
        } else {
            this.PlatformTest()
            return this.isTablet;
        }
    }
    public static IsPc() {
        if (this.isPc == true) {
            return this.isPc;
        } else {
            this.PlatformTest()
            return this.isPc;
        }
    }
    private static PlatformTest() {
        var os = function () {
            var ua = navigator.userAgent,
                isWindowsPhone = /(?:Windows Phone)/.test(ua),
                isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone,
                isAndroid = /(?:Android)/.test(ua),
                isFireFox = /(?:Firefox)/.test(ua),
                isChrome = /(?:Chrome|CriOS)/.test(ua),
                isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid && !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua)),
                isPhone = /(?:iPhone)/.test(ua) && !isTablet,
                isPc = !isPhone && !isAndroid && !isSymbian;
            return {
                isTablet: isTablet,
                isPhone: isPhone,
                isAndroid: isAndroid,
                isPc: isPc
            };
        }();
        if (os.isAndroid || os.isPhone) {
            // 手机
            // document.write('<meta name="viewport" content="width=device-width,initial-scale=0.3">')
            this.isMobile = true;
            // console.log("ljc - js判断平台: 手机");
        } else if (os.isTablet) {
            // 平板
            // document.write('<meta name="viewport" content="width=device-width,initial-scale=0.6">')
            this.isTablet = true;
            // console.log("ljc - js判断平台: 平板");
        } else if (os.isPc) {
            // pc
            // document.write('<meta name="viewport" content="width=device-width,initial-scale=1">')
            this.isPc = true;
            // console.log("ljc - js判断平台: PC");
        }
    }
    //#endregion
}