#!/bin/bash

echo "Test for acpi_call/vgaswitcheroo"
if [ -f /sys/kernel/debug/vgaswitcheroo/switch ]; then
    echo "vgaswitcheroo is OK! ;-)"
else
  if [ -f /proc/acpi/call ]; then
    echo "acpi_call is OK! ;-)"
  else
    modprobe acpi_call
    if [ -f /proc/acpi/call ]; then
      echo "Warning: Please configure acpi_call module for autoloading on system startup!"
    else
      echo "No vgaswitcheroo/acpi_call found. Please configure/install one of them! ;-("
      exit -1
    fi
  fi
fi

echo "Test for nVidia driver"
snail.nv_pwr_on && snail.nv_pwr_off
if [ 0 -eq $? ]; then
  echo "nVidia driver is OK! ;-)"
else
  echo "Test failed ;-("
  echo "Probably you need to install standart nVidia driver or make a bug report..."
  exit -1
fi

echo "Test for dmidecode utility..."
which dmidecode &>/dev/null
if [ 0 -eq $? ]; then
  echo "dmidecode utility is OK! ;-)"
else
  echo "Please install dmidecode and run the script again."
  exit -1
fi

echo "Detecting your distribution..."
DISTRIB_ID=
DISTRIB_DESCRIPTION=
DISTRIB_RELEASE=
DISTRIB_CODENAME=
if [ -f /etc/gentoo-release ]; then
  DISTRIB_ID=gentoo
  DISTRIB_DESCRIPTION=`cat /etc/gentoo-release`
  DISTRIB_RELEASE=${DISTRIB_DESCRIPTION##* }
  DISTRIB_CODENAME=gentoo
elif [ -f /etc/debian_version ]; then
  DISTRIB_ID=debian
  DISTRIB_RELEASE=`cat /etc/debian_version`
  DISTRIB_DESCRIPTION=`cat /etc/issue.net`
  DISTRIB_CODENAME=${DISTRIB_RELEASE%%/*}
elif [ -f /etc/slax_version ]; then
  DISTRIB_ID=slax
  DISTRIB_DESCRIPTION=`cat /etc/slax_version`
elif [ -f /etc/arch-release ]; then
  DISTRIB_ID=arch
  DISTRIB_DESCRIPTION=`cat /etc/arch-release`
elif [ -f /etc/slackware_version ]; then
  DISTRIB_ID=slackware
  DISTRIB_DESCRIPTION=`cat /etc/slackware_version`
elif [ `which lsb_release &>/dev/null` ]; then
  DISTRIB_ID=`lsb_release | grep '^Distributor' | sed 's~[^:]*:~~' | tr 'A-Z' 'a-z'`
  DISTRIB_DESCRIPTION=`lsb_release | grep '^Description' | sed 's~[^:]*:~~'`
  DISTRIB_RELEASE=`lsb_release | grep '^Release' | sed 's~[^:]*:~~'`
  DISTRIB_CODENAME=`lsb_release | grep '^Codename' | sed 's~[^:]*:~~'`
elif [ -f /etc/os-release ]; then
  DISTRIB_ID=`grep '^ID=' /etc/os-release | cut -d'=' -f2`
  DISTRIB_DESCRIPTION=`grep '^PRETTY_NAME=' /etc/os-release | cut -d'=' -f2`
  DISTRIB_RELEASE=`grep '^VERSION_ID=' /etc/os-release | cut -d'=' -f2`
  DISTRIB_CODENAME=`grep '^NAME=' /etc/os-release | cut -d'=' -f2`
elif [ -f /etc/fedora-release ]; then
  DISTRIB_ID=fedora
  DISTRIB_DESCRIPTION=`cat /etc/fedora-release`
  DISTRIB_RELEASE=${DISTRIB_DESCRIPTION% *}
  DISTRIB_RELEASE=${DISTRIB_RELEASE##* }
  DISTRIB_CODENAME=${DISTRIB_DESCRIPTION##*\(}
  DISTRIB_CODENAME=${DISTRIB_CODENAME%%\)*}
else
  DISTRIB_DESCRIPTION=`cat /etc/*release* | head -n1`
  DISTRIB_ID=`echo ${DISTRIB_DESCRIPTION%% *} | tr 'A-Z' 'a-z'`
  DISTRIB_RELEASE=`echo ${DISTRIB_DESCRIPTION%% *} | sed 's~[^0-9]\+\([0-9\.]\+\).*~\1~'`
  DISTRIB_CODENAME=$DISTRIB_ID
fi
[ "" == "$DISTRIB_ID" ] && echo 'GNU/Linux distribution not recognized, sorry! Please post a bug!' && exit -1
echo 'Detected distribution:'
echo "DISTRIB_ID=$DISTRIB_ID"
echo "DISTRIB_DESCRIPTION=$DISTRIB_DESCRIPTION"
echo "DISTRIB_RELEASE=$DISTRIB_RELEASE"
echo "DISTRIB_CODENAME=$DISTRIB_CODENAME"

SNAIL_INIT_D_PATH=/usr/share/snail/init.d
echo "Copying system init scripts (SysV/OpenRC/Systemd), start snail-watcher, configuring kernel modules and OpenGL libraries"
[[ -d /usr/lib64/snail && ! -d /usr/lib/snail ]] && ln -s /usr/lib64/snail /usr/lib/snail
case "$DISTRIB_ID" in
  "gentoo")
    cp -f $SNAIL_INIT_D_PATH/snail-watcher.openrc /etc/init.d/snail-watcher
    cp -f $SNAIL_INIT_D_PATH/snail-xserver.openrc /etc/init.d/snail-xserver
    eselect rc delete snail-xserver boot default
    eselect rc delete snail-watcher boot
    eselect rc add snail-watcher default
    eselect rc stop snail-xserver
    eselect rc restart snail-watcher
 
    eselect opengl set xorg-x11
    for arch in 32bit 64bit; do
      for chip in i915 i965 r300 r600 sw; do
        eselect mesa set $arch $chip classic &>/dev/null;
      done;
    done
    ln -sf /usr/lib/opengl/nvidia/extensions /usr/lib/snail/
    ln -sf /usr/lib/opengl/nvidia/lib /usr/lib/snail/
    ln -sf /usr/lib/xorg/modules /usr/lib/snail/
    grep acpi_call /etc/conf.d/modules || echo 'modules="${modules} acpi_call' >> /etc/conf.d/modules
  ;;

  "debian")
    cp -f $SNAIL_INIT_D_PATH/snail-watcher.sysv /etc/init.d/snail-watcher
    cp -f $SNAIL_INIT_D_PATH/snail-xserver.sysv /etc/init.d/snail-xserver
    update-rc.d snail-xserver remove
    update-rc.d snail-watcher defaults
    /etc/init.d/snail-xserver stop
    /etc/init.d/snail-watcher start
 
    grep '^acpi_call$' /etc/modules || echo acpi_call >> /etc/modules
    case "$DISTRIB_RELEASE" in
      6.?.?)
        # nVidia driver installed from Debian repositories
        if [ -f /usr/lib/nvidia/diversions/libGL.so.1 ]; then
          ln -sf /usr/lib/xorg/modules/libfb.so /usr/lib/snail/libfb.so
          ln -sf /usr/lib/xorg/modules/libwfb.so /usr/lib/snail/libwfb.so
          ln -sf /usr/lib/xorg/modules/drivers/nvidia_drv.so /usr/lib/snail/nvidia_drv.so

          # rm -f /usr/lib/xorg/modules/extensions/libglx.so

          ln -sf /usr/lib/xorg/modules/extensions/libglx.so.[0-9][0-9]* /usr/lib/snail/libglx.so
          ln -sf /usr/lib/libGL.so.[0-9][0-9]* /usr/lib/snail/libGL.so.1

          # apt-get install --reinstall xserver-xorg-core
          # rm -f /etc/alternatives/libGL.so.1
          # ln -s /usr/lib/nvidia/diversions/libGL.so.1 /etc/alternatives

        # nVidia driver was installed by NVIDIA-installer...run
        else
          ln -sf /usr/lib/xorg/modules/libfb.so /usr/lib/snail/libfb.so
          ln -sf /usr/lib/xorg/modules/libwfb.so /usr/lib/snail/libwfb.so
          ln -sf /usr/lib/xorg/modules/drivers/nvidia_drv.so /usr/lib/snail/nvidia_drv.so
          ln -sf /usr/lib/xorg/modules/extensions/libglx.so.[0-9][0-9]* /usr/lib/snail/libglx.so
          ln -sf /usr/lib/libGL.so.[0-9][0-9]* /usr/lib/snail/libGL.so.1

          rm -f /usr/lib/libGL.so /usr/lib/libGL.so.1
          mv -f /usr/lib/libGL.so.* /tmp
          apt-get install --reinstall libgl1-mesa-glx
          mv -f /tmp/libGL.so.* /usr/lib
        fi
      ;;

      wheezy*)
          rm -f /etc/alternatives/glx--libGL.so.1-x86_64-linux-gnu
          ln -sf /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1 /etc/alternatives/glx--libGL.so.1-x86_64-linux-gnu
          rm -f /etc/alternatives/glx--linux-libglx.so
          ln -sf /usr/lib/xorg/modules/extensions/libglx.so /etc/alternatives/glx--linux-libglx.so

          ln -sf /usr/lib/xorg/modules/libfb.so /usr/lib/snail/libfb.so
          ln -sf /usr/lib/xorg/modules/libwfb.so /usr/lib/snail/libwfb.so

          ln -sf /usr/lib/x86_64-linux-gnu/nvidia/current/libGL.so.1 /usr/lib/snail/libGL.so.1
          ln -sf /etc/alternatives/nvidia/libglx.so /usr/lib/snail/libglx.so
          ln -sf /usr/lib/nvidia/nvidia/nvidia_drv.so /usr/lib/snail/nvidia_drv.so
      ;;

      *)
        echo "No rules for Your distribution. Please make a bug report."
        exit -1
      ;;
    esac
  ;;

  "fedora")
    case "$DISTRIB_CODENAME" in
      Verne)
        echo acpi_call > /etc/modules-load.d/snail.conf
          cp -f $SNAIL_INIT_D_PATH/snail-watcher.systemd /etc/systemd/system/snail-watcher.service
          cp -f $SNAIL_INIT_D_PATH/snail-xserver.systemd /etc/systemd/system/snail-xserver.service
          systemctl --system daemon-reload
          systemctl start snail-watcher.service
          systemctl enable snail-watcher.service
          ln -sf /usr/lib64/xorg/modules/libfb.so /usr/lib/snail/libfb.so
          ln -sf /usr/lib64/xorg/modules/libwfb.so /usr/lib/snail/libwfb.so
          ln -sf /usr/lib64/xorg/modules/drivers/nvidia_drv.so /usr/lib/snail/nvidia_drv.so
          rm -f /usr/lib64/xorg/modules/extensions/nvidia/libglx.so
          rm -f /usr/lib64/nvidia/libGL.so.1
          ln -sf /usr/lib64/nvidia/libGL.so.[0-9][0-9]* /usr/lib/snail/libGL.so.1
          ln -sf /usr/lib64/xorg/modules/extensions/nvidia/libglx.so.[0-9][0-9]* /usr/lib/snail/libglx.so
      ;;

      *)
        echo "No rules for Your distribution. Please make a bug report."
        exit -1
      ;;
    esac
  ;;

  *)
    echo "No rules for Your distribution. Please make a bug report."
    exit -1
  ;;
esac

echo "Creating backups of original xorg.conf.* files and replacing with snail's versions..."
[[ -f /etc/X11/xorg.conf && ! -f /etc/X11/xorg.conf.snail-bkp ]] && mv /etc/X11/xorg.conf /etc/X11/xorg.conf.snail-bkp
[[ -f /etc/X11/xorg.conf.intel && ! -f /etc/X11/xorg.conf.intel.snail-bkp ]] && mv /etc/X11/xorg.conf.intel /etc/X11/xorg.conf.intel.snail-bkp
[[ -f /etc/X11/xorg.conf.nvidia && ! -f /etc/X11/xorg.conf.nvidia.snail-bkp ]] && mv /etc/X11/xorg.conf.nvidia /etc/X11/xorg.conf.nvidia.snail-bkp
cp -f /etc/X11/xorg.conf.intel.snail /etc/X11/xorg.conf.intel
cp -f /etc/X11/xorg.conf.nvidia.snail /etc/X11/xorg.conf.nvidia
ln -sf xorg.conf.intel /etc/X11/xorg.conf

echo "Recognizing BusID of both chips and set it in xorg.conf.* files..."
BusIDIntel="PCI:`lspci | grep VGA | grep Intel | cut -d" " -f1 | sed 's~\.~\:~g ; s~0\([0-9]\)~\1~g'`"
BusIDNvidia="PCI:`lspci | grep VGA | grep nVidia | cut -d" " -f1 | sed 's~\.~\:~g ; s~0\([0-9]\)~\1~g'`"
sed -i "s~BusIDIntel~$BusIDIntel~" /etc/X11/xorg.conf.intel
sed -i "s~BusIDNvidia~$BusIDNvidia~" /etc/X11/xorg.conf.nvidia

echo "`basename -- $0` is complete! ;-)"