#!/bin/sh

. "$(pwd)/.config"

# create install file
# header
echo '#!/bin/sh
' > install.sh
# add config
cat .config >> install.sh
# body
echo '

usage()
{
  echo "$(basename "$0")" [option...]
  echo "
Options:
  -h         Show this help message
  -c <path>  Use this path as config"
}

random_string()
{
  tr -cd '[:alnum:]' < /dev/urandom | head -c$1
}

config_path=/etc/zpkg

while getopts ":hc:" opt;
do
  case $opt in
    h)
      usage
      exit 0
      ;;
    c)
      config_path="$OPTARG"
      ;;
    \?)
      echo "Uknown option: $OPTARG"
      usage
      exit 1
      ;;
    esac
done

shift $((OPTIND-1))

if [ "$(id | cut -d"=" -f2 | cut -d"(" -f1)" -eq 0 ] && [ "$1" != "force" ]
then
  echo "Cannot run as root" >&2
  echo "Use '$(basename "$0") force' to force running as root"
  exit 10
else
  which sudo >/dev/null || { echo "sudo not installed" >&2 && exit 11; }
  sudo=sudo
fi

# Generate conf file
$sudo sh -c "{
  echo SSH_ADDRESS=$SSH_USER@$SSH_ADDR
  echo HTTP_ADDRESS=$HTTP_ADDR/$HTTP_PATH
  echo PKG_PATH=pkg
} > zpkg.conf"

# install config file
$sudo mkdir -p "$config_path" || exit $?
$sudo mv zpkg.conf "$config_path" || exit $?

# download zpkg
tmpdir=/tmp/zpkg$(random_string 5)
mkdir -p "$tmpdir" || exit $?
(
  cd "$tmpdir" || exit $?
  if ! wget "$HTTP_ADDR/$HTTP_PATH/zpkg.tar.xz" -q -O "zpkg.tar.xz"
  then
    echo "Cannot reach $HTTP_ADDR/$HTTP_PATH" > /dev/stderr
    exit 1
  fi
  tar -xf zpkg.tar.xz || exit $?

# install zpkg package
  ROOT/usr/local/bin/zpkg install zpkg || exit $?
)

# cleanup
rm -rd "$tmpdir" || exit $?
zpkg update-database >/dev/null || exit $?

' >> install.sh
mv install.sh "$HOME/$PKG_PATH"