#!/bin/sh
# $Id$
# -*- sh -*- vim: ft=sh sw=4 sts=4

# Checks several sources of information and updates my away status
# appropriately.  Designed to be periodically called by cron on marge.

PATH=/home/tpope/bin:/bin:/usr/bin

out="Out"
sleeping="Sleeping"
afk="Away from keyboard"
off="Desktop is off"

old_away="`tpope away`"
[ -f "$HOME/.away-smart" ] && . "$HOME/.away-smart"
cat /dev/null > "$HOME/.away-smart"

ssh="ssh -a -x -oBatchmode=yes -oSetupTimeOut=20"

if [ -f "/tmp/LCK..`basename $0`" ]; then
    if [ -d "/tmp/LCK..`basename $0`" ]; then
        #echo "Locked.  Exiting." >&2
        exit 1
    else
        #echo "Stale lock file found.  Removing." >&2
        rm -f "/tmp/LCK..`basename $0`"
    fi
fi

trap 'rm -f "/tmp/LCK..`basename $0`"' EXIT
echo $$ > "/tmp/LCK..`basename $0`"

set_smart() {
    [ -z "$old_away" -o "$old_away" = "$old_smart" ] && \
    tpope away "$*"
    smart="$*"
}

set_custom() {
    [ -z "$old_away" -o "$old_away" = "$old_smart" ] && \
    tpope away "$*"
}

set_out() {
    # Away message is empty or older then our "smart" flag
    #[ -n "$old_away" -a "$HOME/.away" -nt "$HOME/.away-smart" ] || \
    [ -z "$old_away" -o "$old_away" = "$old_smart" ] && \
    tpope away "$*"
    set_smart "$*"
}

set_in() {
    if [ "`date +%k`" -ge 2 -a "`date +%k`" -le 9 ]; then
	#[ -n "$old_away" -a "$HOME/.away" -nt "$HOME/.away-smart" ] || \
	set_smart "$sleeping"
    else
	set_smart "$*"
    fi
}

set_active() {
    if [ -n "$old_smart" -a -n "$old_away" ]; then
	tpope away -c
	set_smart ""
    fi
    #[ -f "$HOME/.away-smart" ] && tpope away -c
}

now="$(expr 60 \* $(date +%H) + $(date +%M))"

today --category='school' | sed -e s/^..........// -e 's/ \[.*\]$//'|grep '[0-9][0-9]:[0-9][0-9]-[0-9][0-9]:[0-9][0-9]'| \
while read times event; do
    begin="$(expr 60 \* $(echo $times|sed -e 's/-.*//' -e 's/:/ + /g'))"
    end="$(expr 60 \* $(echo $times|sed -e 's/.*-//' -e 's/:/ + /g'))"
    max_end="$end"
    begin="`expr $begin - 15`"
    end="`expr $begin / 2 + $end / 2`"
    if [ "$begin" -le "$now" -a "$now" -lt "$end" ]; then
	echo "scheduled=\"Class ($event)\"" > "$HOME/.away-smart"
	break
    elif [ "$old_away" = "Class ($event)" -a "$now" -gt "$max_end" ]; then
	echo "old_smart=\"$old_away\"" > "$HOME/.away-smart"
    fi
done

today --category='!school' | sed -e s/^..........//|grep '[0-9][0-9]:[0-9][0-9]-[0-9][0-9]:[0-9][0-9]'| \
while read times event; do
    begin="$(expr 60 \* $(echo $times|sed -e 's/-.*//' -e 's/:/ + /g'))"
    end="$(expr 60 \* $(echo $times|sed -e 's/.*-//' -e 's/:/ + /g'))"
    max_end="$end"
    if [ "$begin" -le "$now" -a "$now" -lt "$end" ]; then
	echo "scheduled=\"$event\"" > "$HOME/.away-smart"
	break
    elif [ "$old_away" = "$event" -a "$now" -gt "$max_end" ]; then
	echo "old_smart=\"$old_away\"" > "$HOME/.away-smart"
    fi
done

[ -f "$HOME/.away-smart" ] && . "$HOME/.away-smart"
old_sched="$scheduled"

for host in abe homer lisa mona; do
    ping -c 1 $host >/dev/null 2>&1 && livehosts="$livehosts $host"
done

for host in $livehosts; do
    # True if a non-blanked display is found
    $ssh $host 'if DISPLAY=:0.0 xscreensaver-command -version >/dev/null 2>&1; then if DISPLAY=:0.0 xscreensaver-command -time 2>&1 |egrep "non-blanked|no saver status" >/dev/null; then true; else pid=`ps ax|grep "[0-9]:[0-9][0-9] ssh .*exec screen.*RR irc"|sed -e "s/^  *//"|cut -d" " -f 1`; [ -f "$HOME/.irc.lock" -o -z "$pid" ] || kill $pid; false; fi; else false; fi' && alive=$host
done

if ! ping -c 1 mona >/dev/null 2>/dev/null; then
    phone=unknown
else
    last_slh="`$ssh mona cat .blue/last_slh 2>/dev/null`"
    if [ -z "$last_slh" ]; then
	phone=unknown
    elif [ "$(expr "$(date +%s)" - "$last_slh")" -lt 600 ]; then
	phone=present
    else
	phone=absent
    fi
fi

if [ -n "$scheduled" ]; then
    set_custom "$scheduled"
elif [ -n "$alive" ]; then
    set_active
elif [ "$phone" = unknown ]; then
    set_in "$afk"
elif [ "$phone" = present ]; then
    set_in "$afk"
else
    set_out "$out"
fi

cat /dev/null > "$HOME/.away-smart"
echo "old_smart=\"$smart\"" >>~/.away-smart
echo "old_phone=\"$phone\"" >>~/.away-smart
echo "old_alive=\"$alive\"" >>~/.away-smart
echo "old_sched=\"${scheduled:-$old_sched}\"" >>~/.away-smart

exit 0