#!/bin/bash

if [[ -z $1 ]]; then
    echo "Usage: $(basename $0) user"
    exit 1
else
    user=$1
fi

cd /vol/mail

# create an archive mailbox (and throw away error because
# we don't mind if it already exists)
doveadm mailbox create -u "$user" -s Archive 2> /dev/null

# assume no messages in INBOX are older than this year
year=2010
currentyear=$(date +%Y)

while [[ $year -le $currentyear ]]; do
    # create an Archive/$year mailbox
    doveadm mailbox create -u $user -s Archive.$year 2> /dev/null

    # Get list of all subdirs of INBOX
    mailboxes=$(doveadm mailbox list -u $user | grep -E '^INBOX\..*$' \
              | perl -pe 'chomp if eof' | perl -pe 's/^/MAILBOX /' \
              | perl -pe 's/\n/ OR /')
    # add Sent and INBOX to our mailboxes list
    mailboxes="MAILBOX Sent OR MAILBOX INBOX ${mailboxes:+OR} $mailboxes"
    # move to the Archive/$year mailbox messages that:
    # have been flagged as read,
    # were received on or before $year,
    # are older than 90 days,
    # and are in our aforementioned mailboxes
    doveadm move -u $user Archive.$year SEEN BEFORE 1-Jan-$(($year+1)) \
                                        BEFORE 90d \( $mailboxes \)

    # delete Archive/$year mailbox if it is empty
    doveadm mailbox delete -u $user -e Archive.$year 2> /dev/null

    # increment year variable
    year=$(($year+1))
done

# delete messages from Trash that have been there for more than 2 weeks
doveadm expunge -u $user SAVEDBEFORE 2w MAILBOX Trash