#!/bin/sh

set -e

# read in dotfile
pingmailrc=$HOME'/.pingmailrc'
if [ ! -f $pingmailrc ]; then
    echo 'No .pingmailrc found at '$pingmailrc', aborting.'
    exit
fi
. $HOME'/.pingmailrc'
mkdir -p $testdir

# interpret arguments
if [ "$1" = "check" ]; then
    continue
elif [ "$1" = "touch" ]; then
    touch $ping_touch
    exit
else
    echo 'usage: '$0' COMMAND\n(COMMAND one of "check", "touch")'
    exit
fi

# check test file for last modtime 
modtime_pingfile=0
if [ -f $ping_touch ]; then
    modtime_pingfile=`stat $ping_touch --format=%Y`
fi

# search mailbox or maildir for last life sign datetime
modtime_mails=0
if [ ! "$mbox" = "" ]; then
	modtime_mails=`stat "$mbox" --format=%Y`
else
	while read file; do
	    if [ -z $file ]; then
		break
	    fi
	    modtime=`stat $file --format=%Y`
	    if [ "$modtime" -gt "$modtime_mails" ]; then
		modtime_mails=$modtime
	    fi
	done <<EOF
$(grep -lER "$matchstring" $maildir)
EOF
fi

# find delta of last life sign datetime / test file modtime and current datetime
now=`date +%s`
modtime=0
if [ "$modtime_mails" -gt "$modtime_pingfile" ]; then
    echo "The most recent life sign is in the mails."
    modtime=$modtime_mails
else
    echo "Ping wait file was updated more recently than last life sign from the mails."
    modtime=$modtime_pingfile
fi
delta=`expr $now - $modtime`
echo "Wait time since last life sign or ping sent: "$delta" seconds."

# if delta > wait time, send reminder to person to check with, start reminder
# mail timer if not in existence, re-touch ping wait file
if [ "$delta" -gt "$wait_time" ]; then
    echo $msg2checked | $mailclient_s "$subj2checked" $checked_address
    echo "Sending ping message."
    touch $ping_touch
    if [ ! -f "$reminder_touch" ]; then
        touch $reminder_touch
        echo "Creating reminder message wait time file."
    fi
fi

# if last life sign datetime / test file modtime > modtime of reminder touch
# file, delete it; otherwise, if delta between those > wait time, send reminder
# to person checking and then delete reminder touch file 
if [ -f "$reminder_touch" ]; then
    modtime_reminder=`stat $reminder_touch --format=%Y`
    if [ "$modtime" -gt "$modtime_reminder" ]; then
        rm $reminder_touch
        echo "Deleting reminder message wait time file."
    else
        delta=`expr $now - $modtime_reminder`
        if [ "$delta" -gt "$wait_time" ]; then
            echo $msg2checker | $mailclient_s "$subj2checker" $checker_address
            echo "Sending reminder message."
            rm $reminder_touch
            echo "Deleting reminder message wait time file."
        fi
    fi
fi