#!/bin/bash

echo "Test for acpi_call module..."
lsmod | grep '^acpi_call ' &>/dev/null
if [ 0 -eq $? ]; then
  echo "acpi_call is OK! ;-)"
else
  modprobe acpi_call && lsmod | grep '^acpi_call ' &>/dev/null
  if [ 0 -eq $? ]; then
    modprobe -rf acpi_call
    echo "Please configure acpi_call module for autoloading on system start and try again!"
    exit -1
  else
    echo "acpi_call kernel module not found, please install it!"
    exit -1
  fi
fi

echo "Test for dmidecode utility..."
dmidecode &>/dev/null
if [ 0 -eq $? ]; then
  echo "dmidecode utility is OK! ;-)"
else
  echo "Please install dmidecode and run the script as root again."
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_CODENAME=`cut -d'/' /etc/debian-version -f1`
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` ]; 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`
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"

echo "Configuring OpenGL libraries and nVidia GLX extensions"
if [ "gentoo" == "$DISTRIB_ID" ]; then
  eselect opengl set xorg-x11
  for arch in 32bit 64bit; do
    for chip in i915 i965 r300 r600 sw; do
      eselect mesa set $arch $chip classic &>/dev/null;
    done;
  done
  echo "Adding snail-watcher to default"
  eselect rc delete snail-xserver boot default
  eselect rc delete snail-watcher boot
  eselect rc add snail-watcher default
  eselect rc stop snail-xserver
  eselect rc start snail-watcher
elif [ "fedora" == "$DISTRIB_ID" ]; then
  echo ""
else
  echo "No rules for Your distribution. Please make a bug report."
  exit -1
fi

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! ;-)"