import platform = require('platform');

export class PlatformUtils {
    protected static instance: PlatformUtils;
    constructor() {}

    static getInstance(): PlatformUtils {
        if (!this.instance) {
            this.instance = new PlatformUtils();
        }
        return PlatformUtils.instance;
    }

    public isChromeBrowser(): boolean {
        return platform.name === 'Chrome';
    }

    /**
     * @hidden
     */
    public isSafariBrowser(): boolean {
        return platform.name === 'Safari';
    }

    /**
     * @hidden
     */
    public isChromeMobileBrowser(): boolean {
        return platform.name === 'Chrome Mobile';
    }

    /**
     * @hidden
     */
    public isFirefoxBrowser(): boolean {
        return platform.name === 'Firefox';
    }

    /**
     * @hidden
     */
    public isFirefoxMobileBrowser(): boolean {
        return platform.name === 'Firefox Mobile' || platform.name === 'Firefox for iOS';
    }

    /**
     * @hidden
     */
    public isOperaBrowser(): boolean {
        return platform.name === 'Opera';
    }

    /**
     * @hidden
     */
    public isOperaMobileBrowser(): boolean {
        return platform.name === 'Opera Mobile';
    }

    /**
     * @hidden
     */
    public isEdgeBrowser(): boolean {
        const version = platform?.version ? parseFloat(platform.version) : -1;
        return platform.name === 'Microsoft Edge' && version >= 80;
    }

    /**
     * @hidden
     */
    public isEdgeMobileBrowser(): boolean {
        const version = platform?.version ? parseFloat(platform.version) : -1;
        return platform.name === 'Microsoft Edge' && (platform.os?.family === 'Android' || platform.os?.family === 'iOS') && version > 45;
    }

    /**
     * @hidden
     */
    public isAndroidBrowser(): boolean {
        return platform.name === 'Android Browser';
    }

    /**
     * @hidden
     */
    public isElectron(): boolean {
        return platform.name === 'Electron';
    }

    /**
     * @hidden
     */
    public isNodeJs(): boolean {
        return platform.name === 'Node.js';
    }

    /**
     * @hidden
     */
    public isSamsungBrowser(): boolean {
        return platform.name === 'Samsung Internet Mobile' || platform.name === 'Samsung Internet';
    }

    /**
     * @hidden
     */
    public isIPhoneOrIPad(): boolean {
        const userAgent = !!platform.ua ? platform.ua : navigator.userAgent;
        const isTouchable = 'ontouchend' in document;
        const isIPad = /\b(\w*Macintosh\w*)\b/.test(userAgent) && isTouchable;
        const isIPhone = /\b(\w*iPhone\w*)\b/.test(userAgent) && /\b(\w*Mobile\w*)\b/.test(userAgent) && isTouchable;
        return isIPad || isIPhone;
    }

    /**
     * @hidden
     */
    public isIOSWithSafari(): boolean {
        const userAgent = !!platform.ua ? platform.ua : navigator.userAgent;
        return (
            this.isIPhoneOrIPad() &&
            /\b(\w*Apple\w*)\b/.test(navigator.vendor) &&
            /\b(\w*Safari\w*)\b/.test(userAgent) &&
            !/\b(\w*CriOS\w*)\b/.test(userAgent) &&
            !/\b(\w*FxiOS\w*)\b/.test(userAgent)
        );
    }

    /**
     * @hidden
     */
    public isIonicIos(): boolean {
        return this.isIPhoneOrIPad() && platform.ua!!.indexOf('Safari') === -1;
    }

    /**
     * @hidden
     */
    public isIonicAndroid(): boolean {
        return platform.os!!.family === 'Android' && platform.name == 'Android Browser';
    }

    /**
     * @hidden
     */
    public isMobileDevice(): boolean {
        return platform.os!!.family === 'iOS' || platform.os!!.family === 'Android';
    }

    /**
     * @hidden
     */
    public isReactNative(): boolean {
        return false;
    }

    /**
     * @hidden
     */
    public isChromium(): boolean {
        return (
            this.isChromeBrowser() ||
            this.isChromeMobileBrowser() ||
            this.isOperaBrowser() ||
            this.isOperaMobileBrowser() ||
            this.isEdgeBrowser() ||
            this.isEdgeMobileBrowser() ||
            this.isSamsungBrowser() ||
            this.isIonicAndroid() ||
            this.isIonicIos() ||
            this.isElectron()
        );
    }

    /**
     * @hidden
     */
    public canScreenShare(): boolean {
        const version = platform?.version ? parseFloat(platform.version) : -1;
        // Reject mobile devices
        if (this.isMobileDevice()) {
            return false;
        }
        return (
            this.isChromeBrowser() ||
            this.isFirefoxBrowser() ||
            this.isOperaBrowser() ||
            this.isElectron() ||
            this.isEdgeBrowser() ||
            (this.isSafariBrowser() && version >= 13)
        );
    }

    /**
     * @hidden
     */
    public getName(): string {
        return platform.name || '';
    }

    /**
     * @hidden
     */
    public getVersion(): string {
        return platform.version || '';
    }

    /**
     * @hidden
     */
    public getFamily(): string {
        return platform.os!!.family || '';
    }

    /**
     * @hidden
     */
    public getDescription(): string {
        return platform.description || '';
    }
}