#!/bin/bash

export LANG=C

echo "+OK POP3 server ready"
LOGFILE=/tmp/pop3.log

while read line; do
	echo "[$BASHPID] - $line" >> $LOGFILE
	line="$line"

	COMMAND="${line:0:4}"

	case "$COMMAND" in
		USER)
			LOGINUSER=${line:5}
			echo "+OK $LOGINUSER is a real hoopy frood"
		;;
		PASS)
			MESSAGE="Date: $(/bin/date)
From: <foobar@example.com>
To: <you@example.com>
Subject: Post


$(/usr/games/fortune)"

			MESSAGE_ID=$(/usr/bin/md5sum <<< $MESSAGE)

			echo "$MESSAGE" > /tmp/message

			echo "+OK $LOGINUSER's maildrop has 1 messages (${#MESSAGE} octets)"
		;;
		RETR)
			echo "+OK ${#MESSAGE} octets"
			echo "$MESSAGE"
			echo "."
		;;
		UIDL)
			case "${line:5:1}" in
				1)
					echo "+OK 1 $MESSAGE_ID"
				;;
				*)
					echo "+OK"
					echo "1 MESSAGE_ID"
					echo "."
				;;
			esac
		;;
		STAT)
			echo "+OK 1 ${#MESSAGE}"
		;;
		LIST)
			echo "+OK"
			echo "1 ${#MESSAGE}"
			echo "."
		;;
		DELE)
			echo "+OK message 1 deleted"
		;;
		QUIT)
			echo "+OK bash POP3 server signing off (maildrop empty)"
			exit 0
		;;
		*)
			echo "-ERR"
		;;
	esac
	

done