#!/bin/bash

# kurzinformation:
# ist ein Netzwerkadapter vorhanden?
    # JA
    # ist eine netzwerkverbindung vorhanden?
        # JA
        # ist eine Internetverbindung vorhanden?
            # JA
            # *up/down* *interface: Internet IP-ADRESSE, up/down* green
            # NEIN
            # *up/down* *interface: Intranet IP-ADRESSE, up/down* orange
        # NEIN
        # *off* *interface: off*
    # NEIN
    # *n/a* *network interface not available*

# start firefox
[[ "$BLOCK_BUTTON" == 3 ]] && firefox

# get LONG status
[[ "$BLOCK_BUTTON" == 1 || "$BLOCK_INSTANCE" =~ "long" ]] && LONG=true || LONG=false

# get interface
if [[ -n "$BLOCK_INSTANCE" ]]; then
    IF="${BLOCK_INSTANCE#long}"
else
    IF=$(ip route | awk '/^default/ { print $5 ; exit }')
fi

# check if network interface is available
if [[ "$IF" == "" || ! -d "/sys/class/net/$IF" ]]; then
    [[ "$LONG" ]] && echo "No network" || echo "n/a"
    exit 33
fi

# get interface information
LAN=$(ip addr | grep -E "$IF")

# check if interface is up
if [[ "$LAN" =~ " UP " ]]; then

    # check if interface is connected
    if [[ "$LAN" =~ \<.*UP.*\> ]]; then

        WAN_IP=$(curl -s checkip.dyndns.org | sed -e 's/.*Current IP Address: //' -e 's/<.*$//')
        # check if internet connection is established
        if [[ "$?" -eq 0 && $WAN_IP != "" ]]; then
            [[ $LONG ]] && echo $WAN_IP || echo up
        else
            echo "lan"
        fi
    fi
else
    [[ "$LONG" ]] && echo "$IF: off\noff\n\n" || echo "off\noff\n\n"
fi