#!/bin/bash -e

function check_help {
  case "$1" in
  "--help" | "-h")
    echo "************************************************************"
    echo "*** HELP ***************************************************"
    echo "************************************************************"
    echo "*** Run the script without parameter to build and        ***"
    echo "*** install the driver. The build script will creates a  ***"
    echo "*** build directory (./tmp_build).                       ***"
    echo "*** To specify a build directory just pass a directory   ***"
    echo "*** path.                                                ***"
    echo "***                                                      ***"
    echo "*** e.g.:                                                ***"
    echo "*** mkdir ./my_build_path                                ***"
    echo "*** ./build_install_driver ./my_build_path               ***"
    echo "************************************************************"
    exit 0
    ;;
  *)
  ;;
  esac
}


builddir="./tmp_build/"
if (( "$#" >= "1" )); then
  check_help $1
  if [ -d "${1}" ]; then
    builddir=$(realpath "${1}")
  else
    echo "Error - Given parameter \"$1\" is not a folder or does not exist!"
    exit 1
  fi
else
  mkdir -p "${builddir}"
fi

# check if directories contain white spaces...
invalid_path=$(pwd | { grep " " || true; } )
if [ "${invalid_path}" != "" ]; then
    echo "Error - path contains spaces (\"${PWD}\")! Please use path without."
    exit 1
fi
invalid_path=$(echo ${builddir} | { grep " " || true; } )
if [ "${invalid_path}" != "" ]; then
    echo "Error - path contains spaces (\"${builddir}\")! Please use path without."
    exit 1
fi

if [ -d "${builddir}/libcifx" ] || [ -d "${builddir}/uio_netx" ]; then
    echo "********************************************************************************"
    echo "NOTE: The build folder (\"${builddir}\") is not empty! Force overwrting (yes=y)?"
    echo "      Or pass a new build folder (./build_install_driver [my_build_folder]."
    echo "********************************************************************************"
    read delete_files
    if [ "${delete_files}" = "y" ]; then
	echo "...deleting build folder!"
	rm -rf "${builddir}/libcifx"
	rm -rf "${builddir}/uio_netx" 
    else
	echo "...canceled build process!"
	exit 1
    fi
fi

driver_src=$(dirname $(realpath $0))
scripts_dir="${driver_src}/scripts"

cur_path=$PWD
kernelversion=""
ret=0

install_step="uio_netx"
while [ "$install_step" != "stop" ]
do
case $install_step in
error)
echo "************************************************************"
echo "**** An error occured during the installation            ***"
echo "************************************************************"
echo "Please check the error message in the previous steps."
echo "When the problem is fixed restart the installation."
install_step="stop"
ret=1
;;
uio_netx)
install_step="firmware"
mkdir -p "${builddir}/uio_netx"
echo "************************************************************"
echo "**** Start building kernel module uio_netx               ***"
echo "************************************************************"
if ! "${scripts_dir}/"install_uio_netx build "${builddir}/uio_netx"; then  # build module
  echo "Error building kernel module!"
  install_step="error"
fi
if ! "${scripts_dir}/"install_uio_netx install "${builddir}/uio_netx"; then          # install module
  echo "Error installing kernel module!"
  install_step="error"
fi
;;
firmware)
install_step="libcifx"
echo "************************************************************"
echo "**** Installing kernel module and firmware               ***"
echo "************************************************************"
install_step="libcifx"
if ! "${scripts_dir}/"install_firmware install ; then        # install firmware
  echo "Error installing firmware!"
  install_step="error"
fi
if ! "${scripts_dir}/"install_uio_netx update ; then         # load driver
  echo "Error updating module dependencies!"
  install_step="error"
fi
if ! "${scripts_dir}/"install_uio_netx unload ; then
  echo "Error unloading driver!"
  install_step="error"
fi
if ! "${scripts_dir}/"install_uio_netx load; then
    echo "Error loading driver!"
    install_step="error"
fi
;;
libcifx)
echo "************************************************************"
echo "**** Building and installing user space library libcifx  ***"
echo "************************************************************"
mkdir -p "${builddir}/libcifx"
"${scripts_dir}/"install_libcifx "${builddir}/libcifx"
install_step="stop"
;;
esac
done  
cd ..

exit $ret