{ config, pkgs, ... }:
{
  # Installation and Usage. https://nixos.wiki/wiki/WayDroid
  #
  # Installation:
  #   Initialize and fetch WayDroid images.
  #     sudo waydroid init
  #     # Alternatively, to have GApps support.
  #     sudo waydroid init -s GAPPS -f

  # Un-root Waydroid.
  #   Discussion: https://github.com/waydroid/waydroid/issues/935
  #   Solution: https://github.com/waydroid/waydroid/issues/1060#issuecomment-1732325955 **and** https://github.com/waydroid/waydroid/issues/1060#issuecomment-1813789921
  #     Note: Check if `/var/lib/waydroid/waydroid_base.prop` still contains the added properties after some time.

  # TODO: ARM Apps Incompatible
  #   https://wiki.archlinux.org/title/Waydroid#ARM_Apps_Incompatible
  #   https://www.reddit.com/r/NixOS/comments/15k2jxc/need_help_with_activating_libhoudini_for_waydroid/

  # Startup:
  #   Start the WayDroid LXC container
  #     sudo systemctl start waydroid-container
  #     journalctl -b -u waydroid-container
  #     #=> Started Waydroid Container.
  #   Start WayDroid session
  #     waydroid session start
  #     # You'll know it is finished when you see the message "Android with user 0 is ready".

  # Usage examples:
  #   Install and launch F-Droid
  #     curl -L -o ~/Downloads/F-Droid.apk https://f-droid.org/F-Droid.apk
  #     waydroid app install ~/Downloads/F-Droid.apk
  #   Install S-pushTAN
  #     # Requires Google Play services.
  #     # Aurora Store failed to launch ...
  #     # The old version installs without errors!
  #     waydroid app install ~/Downloads/com.starfinanz.mobile.android.pushtan_1.5.3-20033_arm64-v8a,armeabi-v7a,x86,x86_64_apkmirror.com.apk
  #     # The new version can't be installed without enabling ARM support ...
  #       # Manuall installation fails, but no error message was visible.
  #       waydroid app install ~/Downloads/com.starfinanz.mobile.android.pushtan_4.3.0-30106_arm64-v8a,armeabi-v7a_apkmirror.com.apk
  #       # Install by copying via adb did also fail.
  #         # https://docs.waydro.id/faq/using-adb-with-waydroid
  #         # Settings > About > IP
  #         adb connect <IP>:5555
  #         adb shell
  #           adb ls storage/emulated/0/Download/
  #         adb push ~/Downloads/com.starfinanz.mobile.android.pushtan_4.3.0-30106_apkmirror.com.apk storage/emulated/0/Download/pushtan.apk
  #         # Manually install from files app, gives error "App not installed".
  #   Launch some apps
  #     waydroid show-full-ui
  #     waydroid app list
  #     waydroid app launch org.fdroid.fdroid
  #     waydroid app launch com.aurora.store
  #     waydroid app launch com.starfinanz.mobile.android.pushtan

  #   Stop WayDroid session
  #     waydroid session stop
  #   Stop the Waydroid LXC container
  #     sudo systemctl stop waydroid-container

  # Maintenance - Update Android
  #   sudo waydroid upgrade
  # Cleanup
  #   https://wiki.archlinux.org/title/Waydroid#General_tips

  # TODO: Webcam
  # obs -> add v4l2 video captue -> log entry: info: v4l2-input: Found device 'HD Webcam: HD Webcam' at /dev/video0
  # https://www.reddit.com/r/pop_os/comments/17ngh9h/how_to_make_cameravirtualcamera_working_on/
  # Multiple issues, that camera does not work
  # - https://github.com/waydroid/waydroid/issues/186
  # - https://github.com/waydroid/waydroid/issues/170
  #   OBS virtual camera also doesnt work with v4l2loopback-dkms. https://github.com/waydroid/waydroid/issues/170#issuecomment-949719050#
  #   Some people write, that Open Camera works. https://github.com/waydroid/waydroid/issues/170#issuecomment-1237978646
  # - https://github.com/waydroid/waydroid/issues/284

  assertions = [{
    assertion = config.services.xserver.displayManager.gdm.wayland;
    message = "Waydroid requires Wayland.";
  }];

  virtualisation.waydroid.enable = true;

  # Clipboard sharing. https://nixos.wiki/wiki/WayDroid#Clipboard_sharing
  environment.systemPackages = with pkgs; [
    wl-clipboard
  ];
}