#!/usr/bin/env bash
# Copyright (C) 2014 Julien Bonjean <julien@bonjean.info>
# Copyright (C) 2014 Alexander Keller <github@nycroth.com>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#------------------------------------------------------------------------

# Use the provided interface, otherwise the device used for the default route.
IF="${IFACE:-$BLOCK_INSTANCE}"
for version in 4 6; do
	IF="${IF:-$(ip -$version route  | sed -n 's/^default.*dev \([^ ]*\).*/\1/p' | head -1)}"
done

# Exit if there is no default route
[[ -z "$IF" ]] && exit

#------------------------------------------------------------------------

# As per #36 -- It is transparent: e.g. if the machine has no battery or wireless
# connection (think desktop), the corresponding block should not be displayed.
[[ ! -d /sys/class/net/${IF} ]] && exit

#------------------------------------------------------------------------

AF=${ADDRESS_FAMILY:-"inet6\?"}
LABEL="${LABEL:-}"

for flag in "$1" "$2"; do
  case "$flag" in
    -4)
      AF=inet ;;
    -6)
      AF=inet6 ;;
    -L)
      if [[ "$IF" = "" ]]; then
        LABEL="iface"
      else
        LABEL="$IF:"
      fi ;;
  esac
done

if [[ "$IF" = "" ]] || [[ "$(cat /sys/class/net/$IF/operstate)" = 'down' ]]; then
  echo "${LABEL} down" # full text
  echo "${LABEL} down" # short text
  echo \#FF0000 # color
  exit
fi

# Use the first global scope address that matches limitation and preffer not local one)
while read -r ipaddr; do
  case "$ipaddr" in
    ""|169\.*|f*)
      IPADDR="${IPADDR:-$ipaddr}"
      continue # try another one
  esac
  IPADDR="$ipaddr"
  break
done <<<"$(ip addr show "$IF"  | sed -n 's/.*inet6\? \([^/]\+\).* scope global.*/\1/p')"

case $BLOCK_BUTTON in
  3) echo -n "$IPADDR" | xclip -q -se c ;;
esac

#------------------------------------------------------------------------

echo "$IPADDR" # full text
echo "$IPADDR" # short text

#------------------------------------------------------------------------
# Use ping to check if we have connection

# We ping only once and wait for one second
PINGV="-c 1 -w 1"
# Ping nic.cz
if ping $PINGV cynerd.cz >/dev/null 2>&1; then
	echo \#00FF00 # color
else
	# Ping nic.cz by ip
	if ping $PINGV 77.93.223.198 >/dev/null 2>&1; then
		# No DNS
		echo \#FFFF00 # color
	else
		# Ping default gateway of this interface
		if ping $PINGV $(ip route show dev $IF | awk '/^default via/ {print $3}') >/dev/null 2>&1; then
			# No internet connection but gateway accessible
			echo \#FF9000 # color
		else
			# No internet connection
			echo \#FF0000 # color
		fi
	fi
fi