#!/bin/bash -e

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

trap "echo TRAPed signal" HUP INT QUIT TERM

# Create and modify permissions of XDG_RUNTIME_DIR
sudo -u user mkdir -pm700 /tmp/runtime-user
sudo chown user:user /tmp/runtime-user
sudo -u user chmod 700 /tmp/runtime-user
# Make user directory owned by the user in case it is not
sudo chown user:user /home/user || sudo chown user:user /home/user/* || { echo "Failed to change user directory permissions. There may be permission issues."; }
# Change operating system password to environment variable
echo "user:$PASSWD" | sudo chpasswd
# Remove directories to make sure the desktop environment starts
sudo rm -rf /tmp/.X* ~/.cache
# Change time zone from environment variable
sudo ln -snf "/usr/share/zoneinfo/$TZ" /etc/localtime && echo "$TZ" | sudo tee /etc/timezone > /dev/null
# Add Lutris directories to path
export PATH="${PATH}:/usr/local/games:/usr/games"
# Add LibreOffice to library path
export LD_LIBRARY_PATH="/usr/lib/libreoffice/program:${LD_LIBRARY_PATH}"

# This symbolic link enables running Xorg inside a container with `-sharevts`
sudo ln -snf /dev/ptmx /dev/tty7
# Start DBus without systemd
sudo /etc/init.d/dbus start

# Install NVIDIA userspace driver components including X graphic libraries
if ! command -v nvidia-xconfig &> /dev/null; then
  # Driver version is provided by the kernel through the container toolkit
  export DRIVER_ARCH="$(dpkg --print-architecture | sed -e 's/arm64/aarch64/'  -e 's/i.*86/x86/' -e 's/amd64/x86_64/' -e 's/unknown/x86_64/')"
  export DRIVER_VERSION="$(head -n1 </proc/driver/nvidia/version | awk '{print $8}')"
  cd /tmp
  # If version is different, new installer will overwrite the existing components
  if [ ! -f "/tmp/NVIDIA-Linux-${DRIVER_ARCH}-${DRIVER_VERSION}.run" ]; then
    # Check multiple sources in order to probe both consumer and datacenter driver versions
    curl -fsSL -O "https://international.download.nvidia.com/XFree86/Linux-${DRIVER_ARCH}/${DRIVER_VERSION}/NVIDIA-Linux-${DRIVER_ARCH}-${DRIVER_VERSION}.run" || curl -fsSL -O "https://international.download.nvidia.com/tesla/${DRIVER_VERSION}/NVIDIA-Linux-${DRIVER_ARCH}-${DRIVER_VERSION}.run" || { echo "Failed NVIDIA GPU driver download. Exiting."; exit 1; }
  fi
  # Extract installer before installing
  sudo sh "NVIDIA-Linux-${DRIVER_ARCH}-${DRIVER_VERSION}.run" -x
  cd "NVIDIA-Linux-${DRIVER_ARCH}-${DRIVER_VERSION}"
  # Run installation without the kernel modules and host components
  sudo ./nvidia-installer --silent \
                    --no-kernel-module \
                    --install-compat32-libs \
                    --no-nouveau-check \
                    --no-nvidia-modprobe \
                    --no-rpms \
                    --no-backup \
                    --no-check-for-alternate-installs
  sudo rm -rf /tmp/NVIDIA* && cd ~
fi

# Allow starting Xorg from a pseudoterminal instead of strictly on a tty console
if [ ! -f /etc/X11/Xwrapper.config ]; then
    echo -e "allowed_users=anybody\nneeds_root_rights=yes" | sudo tee /etc/X11/Xwrapper.config > /dev/null
fi
if grep -Fxq "allowed_users=console" /etc/X11/Xwrapper.config; then
  sudo sed -i "s/allowed_users=console/allowed_users=anybody/;$ a needs_root_rights=yes" /etc/X11/Xwrapper.config
fi

# Remove existing Xorg configuration
if [ -f "/etc/X11/xorg.conf" ]; then
  sudo rm -f "/etc/X11/xorg.conf"
fi

# Get first GPU device if all devices are available or `NVIDIA_VISIBLE_DEVICES` is not set
if [ "$NVIDIA_VISIBLE_DEVICES" == "all" ] || [ -z "$NVIDIA_VISIBLE_DEVICES" ]; then
  export GPU_SELECT="$(sudo nvidia-smi --query-gpu=uuid --format=csv | sed -n 2p)"
# Get first GPU device out of the visible devices in other situations
else
  export GPU_SELECT="$(sudo nvidia-smi --id=$(echo "$NVIDIA_VISIBLE_DEVICES" | cut -d ',' -f1) --query-gpu=uuid --format=csv | sed -n 2p)"
  if [ -z "$GPU_SELECT" ]; then
    export GPU_SELECT="$(sudo nvidia-smi --query-gpu=uuid --format=csv | sed -n 2p)"
  fi
fi

if [ -z "$GPU_SELECT" ]; then
  echo "No NVIDIA GPUs detected or nvidia-container-toolkit not configured. Exiting."
  exit 1
fi

# Setting `VIDEO_PORT` to none disables RANDR/XRANDR, do not set this if using datacenter GPUs
if [ "${VIDEO_PORT,,}" = "none" ]; then
  export CONNECTED_MONITOR="--use-display-device=None"
# The X server is otherwise deliberately set to a specific video port despite not being plugged to enable RANDR/XRANDR, monitor will display the screen if plugged to the specific port
else
  export CONNECTED_MONITOR="--connected-monitor=${VIDEO_PORT}"
fi

# Bus ID from nvidia-smi is in hexadecimal format and should be converted to decimal format (including the domain) which Xorg understands, required because nvidia-xconfig doesn't work as intended in a container
HEX_ID="$(sudo nvidia-smi --query-gpu=pci.bus_id --id="$GPU_SELECT" --format=csv | sed -n 2p)"
IFS=":." ARR_ID=($HEX_ID)
unset IFS
BUS_ID="PCI:$((16#${ARR_ID[1]}))@$((16#${ARR_ID[0]})):$((16#${ARR_ID[2]})):$((16#${ARR_ID[3]}))"
# A custom modeline should be generated because there is no monitor to fetch this information normally
export MODELINE="$(cvt -r "${SIZEW}" "${SIZEH}" "${REFRESH}" | sed -n 2p)"
# Generate /etc/X11/xorg.conf with nvidia-xconfig
sudo nvidia-xconfig --virtual="${SIZEW}x${SIZEH}" --depth="$CDEPTH" --mode="$(echo "$MODELINE" | awk '{print $2}' | tr -d '\"')" --allow-empty-initial-configuration --no-probe-all-gpus --busid="$BUS_ID" --no-multigpu --no-sli --no-base-mosaic --only-one-x-screen ${CONNECTED_MONITOR}
# Guarantee that the X server starts without a monitor by adding more options to the configuration
sudo sed -i '/Driver\s\+"nvidia"/a\    Option         "ModeValidation" "NoMaxPClkCheck, NoEdidMaxPClkCheck, NoMaxSizeCheck, NoHorizSyncCheck, NoVertRefreshCheck, NoVirtualSizeCheck, NoExtendedGpuCapabilitiesCheck, NoTotalSizeCheck, NoDualLinkDVICheck, NoDisplayPortBandwidthCheck, AllowNon3DVisionModes, AllowNonHDMI3DModes, AllowNonEdidModes, NoEdidHDMI2Check, AllowDpInterlaced"\n    Option         "HardDPMS" "False"' /etc/X11/xorg.conf
# Add custom generated modeline to the configuration
sudo sed -i '/Section\s\+"Monitor"/a\    '"$MODELINE" /etc/X11/xorg.conf
# Prevent interference between GPUs, add this to the host or other containers running Xorg as well
echo -e "Section \"ServerFlags\"\n    Option \"AutoAddGPU\" \"false\"\nEndSection" | sudo tee -a /etc/X11/xorg.conf > /dev/null

# Default display is :0 across the container
export DISPLAY=":0"
# Run Xorg server with required extensions
/usr/bin/Xorg vt7 -noreset -novtswitch -sharevts -dpi "${DPI}" +extension "GLX" +extension "RANDR" +extension "RENDER" +extension "MIT-SHM" "${DISPLAY}" &

# Wait for X11 to start
echo "Waiting for X socket"
until [ -S "/tmp/.X11-unix/X${DISPLAY/:/}" ]; do sleep 1; done
echo "X socket is ready"

# Run the x11vnc + noVNC fallback web interface if enabled
if [ "${NOVNC_ENABLE,,}" = "true" ]; then
  if [ -n "$NOVNC_VIEWPASS" ]; then export NOVNC_VIEWONLY="-viewpasswd ${NOVNC_VIEWPASS}"; else unset NOVNC_VIEWONLY; fi
  /usr/local/bin/x11vnc -display "${DISPLAY}" -passwd "${BASIC_AUTH_PASSWORD:-$PASSWD}" -shared -forever -repeat -xkb -snapfb -threads -xrandr "resize" -rfbport 5900 ${NOVNC_VIEWONLY} &
  /opt/noVNC/utils/novnc_proxy --vnc localhost:5900 --listen 8080 --heartbeat 10 &
fi

# Start KDE desktop environment
/usr/bin/dbus-launch /usr/bin/startplasma-x11 &

# Start Fcitx input method framework
/usr/bin/fcitx &

# Add custom processes right below this line, or within `supervisord.conf` to perform service management similar to systemd

echo "Session Running. Press [Return] to exit."
read