#!/bin/bash
#
# vmail-stack
# https://git.stack-source.com/msb/vmail-stack
# Copyright (c) 2022 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

# load include file
source $(dirname $0)/vmail.sh

help()
{
  thisfilename=$(basename -- "$0")
  echo "$thisfilename"
  echo "Modify email forward"
  echo ""
  echo "usage: $thisfilename -e <email> -f <forward> [-k <0|1>] [-h]"
  echo ""
  echo "  -h            Print this help."
  echo "  -e <email>    Email address to forward."
  echo "  -f <forward>  Email address to forward to."
  echo "  -k <0|1>      Local Copy (forward & Keep local copy). 0 = no/off, 1 = yes/on. Default is 0."
  echo ""
  echo "                Forwarding is for delivering an email to another domain. Use aliases"
  echo "                for directing emails to another address in the same domain."
  echo "                'email' and 'forward' should both be in full email address format."
  echo "                .e.g to have info@example.org delivered (forwarded) to joe@example.com do:"
  echo "                $thisfilename -e info@example.org -f joe@example.com"
  exit
}

vmail:getoptions "$@"

# check for email
if [[ -z $email ]]; then
  echo "email is required"
  exit 1
fi

# build query
dbcmd="mysql --defaults-extra-file=$MYSQL_CONNECTION_INFO_FILE"
dbcmdopts="-s -r -N -e"

# get forward id, which also verfies that forward already exists
dbquery="SELECT id FROM vm_forwards WHERE mbox='$mbox' AND domain='$domain';"
fowards_id=`eval $dbcmd $dbcmdopts \"$dbquery\"`

if [[ -z $fowards_id ]]; then
  # forward does not exist, can't create forward
  echo "ERROR: Existing Forward for $email does not exist. Add new forward instead."
  exit 1
elif [[ $fowards_id -gt '0' ]]; then
  # verified forward exists, build update query
  dbquery="UPDATE vm_forwards"
  if [[ -z $forward ]] && [[ -z $keep ]]; then
    # nothing to update
    echo "ERROR: No values passed for update."
    exit 1
  elif [[ -n $forward ]] && [[ -n $keep ]]; then
    # update forward_to & save_local
    dbquery="$dbquery SET forward_to='$forward', save_local='$keep'"
  elif [[ -n $forward ]] && [[ -z $keep ]]; then
    # only update forward_to
    dbquery="$dbquery SET forward_to='$forward'"
  elif [[ -z $forward ]] && [[ -n $keep ]]; then
    # only update save_local
    dbquery="$dbquery SET save_local='$keep'"
  else
    echo "ERROR: Uknown error."
    exit 1
  fi
    dbquery="$dbquery WHERE id='$fowards_id'"
    eval $dbcmd $dbcmdopts \"$dbquery\;\"
else
  # db query error
  echo "ERROR: System error querying database."
  exit 1
fi