#!/bin/sh

# TODO: make sure only nagios can write to $inputf and $msgf, else do not run

conf=/etc/ircbot.conf

if ! test -r $conf; then
    echo "cannot read configuration file, exiting"
    exit 1
else
    # shellcheck source=ircbot.conf.default
    . $conf
fi

touch $msgf

connect() {
    echo "NICK $nick" > $inputf
    echo "USER $nick 8 * : $nick" >> $inputf
    echo "PRIVMSG NickServ : identify $password" >> $inputf
    echo "JOIN $chan" >> $inputf
    echo "PRIVMSG $chan : $joinmsg" >> $inputf
}
reconnect() {
    if command -v systemctl >/dev/null; then
        # NOTE: systemd is configured to restart the service, so simply dying
        #       with a non-zero exit code is enough to effectively reconnect.
        exit 2
    else
        # FIXME: We need to make sure we are only running one instance of the
        #        script at a time. This exec is therefore problematic.
        exec $0
    fi
}
delay() {
    while read line
    do
        sleep 1.5
        echo $line
    done
}
register() {
    echo "PRIVMSG NickServ : register $password $email" >> $inputf
}
loop() {
    tail -f $msgf | delay | while read line
    do
        echo "PRIVMSG #ops : $line" >> $inputf
    done
}

connect

loop &

tail -f $inputf | delay | nc $server $port | while read msg
do
    echo "$msg" | tee -a $logf
    case "$msg" in
        *'PING'*) echo "$msg" | sed 's/PING/PONG/' >> $inputf
        ;;
        *'is not a registered nickname.'*) register
        ;;
        *'You have not registered'*) register
        ;;
        *'You have not joined'*) echo "JOIN $chan" >> $inputf
        ;;
        *'Cannot join'*) sleep 10; echo "JOIN $chan" >> $inputf
        ;;
        *'ERROR :Closing link:'*) reconnect
        ;;
    esac
done