#!/bin/sh -e

#DEBHELPER#

if [ "${1}" = "upgrade" ]; then
    if dpkg --compare-versions ${2} lt 0.3.11 && dpkg --compare-versions ${2} gt 0.3.5; then
        update-alternatives --remove gnome-splash \
            /usr/share/images/desktop-base/Splash-Debian.png
        update-alternatives --remove gnome-splash \
            /usr/share/images/desktop-base/Splash-EvolvingTux.png
        update-alternatives --remove gnome-splash \
            /usr/share/images/desktop-base/Splash-Debian_red.png

        dpkg-divert --package desktop-base --rename \
            --divert /usr/share/pixmaps/splash/gnome-splash.png.orig \
            --remove /usr/share/pixmaps/splash/gnome-splash.png
    fi
fi

same_conffile() {
  CONFFILE="$1"
  if [ -e "$CONFFILE" ]; then
    md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
    old_md5sum="`dpkg-query -W -f='${Conffiles}' desktop-base | sed -n -e \"\\\\' $CONFFILE '{s/ obsolete$//;s/.* //p}\"`"
    [ "$md5sum" = "$old_md5sum" ]
    return
  fi
  return 1
}

case "$1" in
  install|upgrade)
    if dpkg --compare-versions "$2" lt "5.0.2"; then
      # if the folder is a symlink (installed by splashy), modified files
      # need to be copied (from /usr/share/splashy/themes) before beeing 
      # replaced. If it's not, they need to be moved (from
      # /etc/splashy/themes)
      # not modified files need to be removed if no symlink, and not
      # touched in case of a symlink
      THEME_FOLDER="/etc/splashy/themes/moreblue-orbit"
      THEME_FOLDER_BAK="/etc/splashy.dpkg-old/themes/moreblue-orbit"
      FILES="background-bw.png background-color.png VeraSans.ttf theme.xml"

      if [ -h /etc/splashy/themes ]; then
      # symlink
        for FILE in ${FILES}; do
          [ -f ${THEME_FOLDER}/${FILE} ] || break
          if ! same_conffile "${THEME_FOLDER}/${FILE}"; then
          # symlink and changed file, copy it in a safe place
            [ -d $THEME_FOLDER_BAK ] || mkdir -p $THEME_FOLDER_BAK
            cp ${THEME_FOLDER}/${FILE} ${THEME_FOLDER_BAK}/
          fi
        done
      else
      # real folder
        for FILE in ${FILES}; do
          [ -f ${THEME_FOLDER}/${FILE} ] || break
          if ! same_conffile "${THEME_FOLDER}/${FILE}"; then
          # real folder and changed file, move it in a safe place
            [ -d $THEME_FOLDER_BAK ] || mkdir -p $THEME_FOLDER_BAK
            mv ${THEME_FOLDER}/${FILE} ${THEME_FOLDER_BAK}/
          else
          # real folder but unchanged file, just remove it
            rm ${THEME_FOLDER}/${FILE}
          fi
        done
      fi
    fi
  ;;
esac