post_install() {
  # Add icons to the system icons
  XDG_ICON_RESOURCE="`which xdg-icon-resource 2> /dev/null || true`"
  if [ ! -x "$XDG_ICON_RESOURCE" ]; then
    echo "Error: Could not find xdg-icon-resource" >&2
    exit 1
  fi
  for icon in product_logo_48.png product_logo_24.png product_logo_256.png product_logo_16.png product_logo_64.png product_logo_128.png product_logo_32.png ; do
    size="$(echo ${icon} | sed 's/[^0-9]//g')"
    "$XDG_ICON_RESOURCE" install --size "${size}" "/opt/bytedance/feishu/${icon}" \
      "bytedance-feishu"
  done

  UPDATE_MENUS="`which update-mime-database usr/share/mime &> /dev/null 2> /dev/null || true`"
  if [ -x "$UPDATE_MENUS" ]; then
    update-mime-database usr/share/mime &> /dev/null
  fi

  # Update cache of .desktop file MIME types. Non-fatal since it's just a cache.
  update-desktop-database > /dev/null 2>&1 || true

  NSS_FILES="libnspr4.so.0d libplds4.so.0d libplc4.so.0d libssl3.so.1d \
      libnss3.so.1d libsmime3.so.1d libnssutil3.so.1d"

  add_nss_symlinks() {
    get_lib_dir
    for f in $NSS_FILES
    do
      target=$(echo $f | sed 's/\.[01]d$//')
      if [ -f "/$LIBDIR/$target" ]; then
        ln -snf "/$LIBDIR/$target" "/opt/bytedance/feishu/$f"
      elif [ -f "/usr/$LIBDIR/$target" ]; then
        ln -snf "/usr/$LIBDIR/$target" "/opt/bytedance/feishu/$f"
      else
        echo $f not found in "/$LIBDIR/$target" or "/usr/$LIBDIR/$target".
        exit 1
      fi
    done
  }

  remove_nss_symlinks() {
    for f in $NSS_FILES
    do
      rm -rf "/opt/bytedance/feishu/$f"
    done
  }

  remove_udev_symlinks() {
    rm -rf "/opt/bytedance/feishu/libudev.so.0"
  }

  remove_udev_symlinks
}

post_upgrade() {
  post_install
}

pre_remove() {
  action="$1"
  if [ "$2" = "in-favour" ]; then
    # Treat conflict remove as an upgrade.
    action="upgrade"
  fi
  # Don't clean-up just for an upgrade.`
  if [ "$action" = "upgrade" ] ; then
        return
  fi

  # Remove icons from the system icons
  XDG_ICON_RESOURCE="`which xdg-icon-resource 2> /dev/null || true`"
  if [ ! -x "$XDG_ICON_RESOURCE" ]; then
    echo "Error: Could not find xdg-icon-resource" >&2
    exit 1
  fi
  for icon in product_logo_48.png product_logo_24.png product_logo_256.png product_logo_16.png product_logo_64.png product_logo_128.png product_logo_32.png ; do
    size="$(echo ${icon} | sed 's/[^0-9]//g')"
    "$XDG_ICON_RESOURCE" uninstall --size "${size}" "bytedance-feishu"
  done

  UPDATE_MENUS="`which update-mime-database usr/share/mime &> /dev/null 2> /dev/null || true`"
  if [ -x "$UPDATE_MENUS" ]; then
    update-mime-database usr/share/mime &> /dev/null
  fi

  # Update cache of .desktop file MIME types. Non-fatal since it's just a cache.
  update-desktop-database > /dev/null 2>&1 || true
}

post_remove() {
  action="$1"

  # Only do complete clean-up on purge.
  if [ "$action" != "purge" ] ; then
        return
  fi

  NSS_FILES="libnspr4.so.0d libplds4.so.0d libplc4.so.0d libssl3.so.1d \
      libnss3.so.1d libsmime3.so.1d libnssutil3.so.1d"

  add_nss_symlinks() {
    get_lib_dir
    for f in $NSS_FILES
    do
      target=$(echo $f | sed 's/\.[01]d$//')
      if [ -f "/$LIBDIR/$target" ]; then
        ln -snf "/$LIBDIR/$target" "/opt/bytedance/feishu/$f"
      elif [ -f "/usr/$LIBDIR/$target" ]; then
        ln -snf "/usr/$LIBDIR/$target" "/opt/bytedance/feishu/$f"
      else
        echo $f not found in "/$LIBDIR/$target" or "/usr/$LIBDIR/$target".
        exit 1
      fi
    done
  }

  {
    for f in $NSS_FILES
    do
      rm -rf "/opt/bytedance/feishu/$f"
    done
  }

  {
    rm -rf "/opt/bytedance/feishu/libudev.so.0"
  }

  remove_udev_symlinks
}