export class DeviceDetect {
  static inIframe(): boolean {
    try {
      return window.self !== window.top;
    } catch {
      return true;
    }
  }

  static hasTouch(): boolean {
    return window.matchMedia("(pointer: coarse)").matches;
  }

  static canHover(): boolean {
    return !window.matchMedia("(hover: none)").matches;
  }

  /**
   * Whether the visitor has asked for less motion. Guarded, unlike its neighbours,
   * because a caller runs under jsdom where `matchMedia` is undefined until a test
   * stubs it.
   */
  static prefersReducedMotion(): boolean {
    return globalThis.matchMedia?.("(prefers-reduced-motion: reduce)").matches ?? false;
  }

  /**
   * Whether to build the app with the reduced chrome. One definition, because
   * two consumers act on it — createViewer decides which widgets exist, and
   * CesiumController decides what the UI toggle is allowed to hide.
   */
  static minimalUI(): boolean {
    return this.inIframe() || this.isIos();
  }

  static isIos(): boolean {
    const userAgent = window.navigator.userAgent.toLowerCase();
    return /iphone|ipad|ipod/.test(userAgent);
  }

  static isSafari(): boolean {
    const userAgent = window.navigator.userAgent.toLowerCase();
    return /safari/.test(userAgent);
  }

  static isInStandaloneMode(): boolean {
    // Non-standard Safari property
    return "standalone" in window.navigator && Boolean((window.navigator as Navigator & { standalone?: boolean }).standalone);
  }

  static isiPhoneWithNotch(): boolean {
    return this.isIos() && /iPhone X/.test(this.getiPhoneModel());
  }

  static isiPhoneWithNotchVisible(): boolean {
    return this.isiPhoneWithNotch() && (this.isInStandaloneMode() || !this.isSafari());
  }

  static getiPhoneModel(): string {
    // Screen geometry and pixel ratio per model, from
    // https://51degrees.com/blog/website-optimisation-for-apple-devices-ipad-and-iphone
    const ratio = window.devicePixelRatio;
    if (window.screen.height / window.screen.width === 896 / 414) {
      switch (ratio) {
        case 2:
          return "iPhone XR";
        case 3:
          return "iPhone XS Max";
        default:
          return "iPhone XR, iPhone XS Max";
      }
    } else if (window.screen.height / window.screen.width === 812 / 375) {
      return "iPhone X, iPhone XS";
    } else if (window.screen.height / window.screen.width === 736 / 414) {
      return "iPhone 6 Plus, 6s Plus, 7 Plus or 8 Plus";
    } else if (window.screen.height / window.screen.width === 667 / 375) {
      if (ratio === 2) {
        return "iPhone 6, 6s, 7 or 8";
      }
      return "iPhone 6 Plus, 6s Plus , 7 Plus or 8 Plus (display zoom)";
    } else if (window.screen.height / window.screen.width === 1.775) {
      return "iPhone 5, 5C, 5S, SE or 6, 6s, 7 and 8 (display zoom)";
    } else if (window.screen.height / window.screen.width === 1.5 && ratio === 2) {
      return "iPhone 4 or 4s";
    } else if (window.screen.height / window.screen.width === 1.5 && ratio === 1) {
      return "iPhone 1, 3G or 3GS";
    } else {
      return "Not an iPhone";
    }
  }
}