#! /bin/bash

# ? This is done to ignore the message "Make sure not to read and write
# ? the same file in the same pipeline", which is a result of ${DATABASE}
# ? being used below. (This disables the message file-wide.)
# shellcheck disable=SC2094

# shellcheck source=../scripts/helper-functions.sh
. /usr/local/bin/helper-functions.sh

DATABASE=${DATABASE:-/tmp/docker-mailserver/postfix-accounts.cf}
ALIAS_DATABASE="/tmp/docker-mailserver/postfix-virtual.cf"
QUOTA_DATABASE="/tmp/docker-mailserver/dovecot-quotas.cf"

function usage
{
  echo "Usage: delmailuser <-y> <user@domain> <user2@anotherdomain> ..."
  echo "	-y: don't prompt for confirmations"
}

while getopts ":y" OPT
do
  case ${OPT} in
    y)
      MAILDEL="y"
      ;;
    \?)
      usage
      errex "Invalid option: -${OPTARG}"
      ;;
    *)
      usage
      errex "Invalid option: -${OPTARG}"
      ;;
  esac
done

shift $((OPTIND-1))

[[ -z ${*} ]] && { usage ; errex "No user specifed" ; }
[[ -s ${DATABASE} ]] || exit 0

# Protect config file with lock to avoid race conditions
(
  flock -e 200

  for USER in "${@}"
  do
    # very simple plausibility check
    [[ ${USER} != *"@"*"."* ]] && errex "No valid address: ${USER}"

    declare -a MAILARR
    MAILARR[0]="${USER%@*}"
    MAILARR[1]="${USER#*@}"

    # XXX ${USER} must not contain /s and other syntactic characters
    USER=$(escape "${USER}")

    if ! sed -i "/^""${USER}""|/d" "${DATABASE}"
    then
      errex "${USER} couldn't be deleted in ${DATABASE}. ${?}"
    fi

    # Delete all aliases where the user is the only recipient( " ${USER$}" )
    # Delete user only for all aliases that deliver to multiple recipients ( ",${USER}" "${USER,}" )
    if sed -i -e "/ ""${USER}""$/d" \
        -e "s/,""${USER}""//g" \
        -e "s/""${USER}"",//g" "${ALIAS_DATABASE}"
    then
      echo "${USER} and potential aliases deleted." || errex "Aliases for ${USER} couldn't be deleted in ${ALIAS_DATABASE}. ${?}"
    fi

    # remove quota directives
    if [[ -f ${QUOTA_DATABASE} ]]
    then
      sed -i -e "/^${USER}:.*$/d" "${QUOTA_DATABASE}" || errex "Quota for ${USER} couldn't be deleted in ${QUOTA_DATABASE}. ${?}"
    fi

    if [[ ${MAILDEL} != "y" ]]
    then
      read -r -p "Do you want to delete the mailbox as well(all mails will be removed)?(y/n) " MAILDEL
      echo
    fi

    [[ ${MAILDEL} != "y" ]] && errex "Leaving the mailbox untouched. If you want to delete it at a later point use \"sudo docker exec mail rm -R /var/mail/${MAILARR[1]}/${MAILARR[0]}\""

    if rm -r -f "/var/mail/${MAILARR[1]}/${MAILARR[0]}"
    then
      echo "Mailbox deleted." || errex "Mailbox couldn't be deleted: ${?}"
    fi
  done

) 200< "${DATABASE}"