post_install() {
  post_upgrade;
}

post_upgrade() {
  # create mympd user, group if not already existing
  echo "INFO: Checking status of mympd system user and group"
  getent group mympd > /dev/null
  [ "$?" = "2" ] && groupadd --system mympd
  getent passwd mympd > /dev/null
  [ "$?" = "2" ] && useradd --system -d /var/lib/mympd -s /usr/sbin/nologin -g mympd mympd

  # fix ownership of /var/lib/mympd
  if ! [ $(stat -c '%U:%G' /var/lib/mympd/) == 'mympd:mympd' ]
  then
    echo "INFO: Fixing ownership of /var/lib/mympd"
    chown -R mympd.mympd /var/lib/mympd
  fi

  # link music directory to mympd if not already exising 
  echo "INFO: Trying to link musicdir to library"
  if [ -f /etc/mpd.conf ]
  then
    LIBRARY=$(grep ^music_directory /etc/mpd.conf | awk {'print $2'} | sed -e 's/"//g')
    [ "$LIBRARY" != "" ] && [ ! -e /usr/share/mympd/htdocs/library ] && ln -s "$LIBRARY" /usr/share/mympd/htdocs/library
  else
    echo "/etc/mpd.conf not found, you must link your musicdir manually to /usr/share/mympd/htdocs/library"
  fi

  # install systemd service
  echo "INFO: Installing systemd service"
  if [ -d /etc/systemd/system ]
  then
    echo "INFO: reloading systemd"
    systemctl daemon-reload
    if [ ! -f /etc/systemd/system/multi-user.target.wants/mympd.service ]
    then
      echo "INFO: enabling mympd.service"
      systemctl enable mympd
    fi
  fi

  # create ssl certificates unless already existing
  if [ -d /etc/mympd/ssl ]
  then
    echo "INFO: Certificates already created"
  else
    echo "INFO: Creating certificates"
    /usr/share/mympd/crcert.sh
  fi

  # move config into place unless already existing
  if [ ! -f /etc/mympd/mympd.conf ]
  then 
    mv /etc/mympd/mympd.conf.dist /etc/mympd/mympd.conf
  else
    echo -e "\e[93mWARNING\e[0m: \e[1mmympd.conf \e[0minstalled as \e[1mmympd.conf.dist\e[0m"
  fi

  # installation complete
  echo -e "\e[93mWARNING\e[0m: Edit \e[1m/etc/mympd/mympd.conf \e[0mbefore starting myMPD"
}

post_remove() {
  # stop and remove systemd service
  systemctl daemon-reload
  if `systemctl is-active --quiet mympd`
    then
    echo "stopping mympd.service" && systemctl stop mympd 
  fi
  echo "disabling mympd.service" && systemctl disable mympd 
 
  # backup config 
  if [ -f /etc/mympd/mympd.conf ]
  then 
    mv /etc/mympd/mympd.conf /etc/mympd/mympd.conf.pacsave
    echo -e "\e[93mINFO\e[0m: /etc/mympd/mympd.conf backed up to /etc/mympd/mympd.conf.pacsave"
  fi

  # unlink music dir
  echo "unlinking musicdir to library"
  [ -e /usr/share/mympd/htdocs/library ] && rm -v /usr/share/mympd/htdocs/library

  # remove mympd user and group
  getent passwd mympd > /dev/null
  echo -e "\e[93mWARNING\e[0m: Removing \e[1mmympd \e[0muser and group!"
  [ "$?" != "2" ] && userdel -r mympd
  getent group mympd > /dev/null
  [ "$?" != "2" ] && groupdel mympd 

  # remove leftover directories
  rmdir -v /usr/share/{mympd/htdocs/,mympd/}
}