#! /bin/bash

# shellcheck disable=SC2094
# ? 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 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"
MAILDEL=false

function usage
{
  echo "Usage: delmailuser [-y] <user@domain> [<user2@anotherdomain>]"
}

while getopts ":yY" OPT
do
  case ${OPT} in
    y | Y )
      MAILDEL=true
      ;;
    * )
      usage
      exit 1
      ;;
  esac
done
shift $((OPTIND-1))

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

if ! ${MAILDEL}
then
  read -r -p "Do you want to delete the mailbox as well (removing all mails) ? [Y/n] " MAILDEL_CHOSEN
  [[ ${MAILDEL_CHOSEN} =~ (y|Y| ) ]] && MAILDEL=true
fi

(
  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#*@}"

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

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

    if [[ -f ${ALIAS_DATABASE} ]]
    then
      # 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."
      else
        errex "Aliases for ${USER} couldn't be deleted in ${ALIAS_DATABASE}."
      fi
    fi

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

    if ! ${MAILDEL}
    then
      echo "Leaving the mailbox untouched. If you want to delete it at a later point use 'sudo docker exec mail rm -R /var/mail/${MAILARR[1]}/${MAILARR[0]}'"
      exit 0
    fi

    if [[ -d "/var/mail/${MAILARR[1]}/${MAILARR[0]}" ]]
    then
      if rm -r -f "/var/mail/${MAILARR[1]}/${MAILARR[0]}"
      then
        echo "Mailbox deleted."
      else
        errex "Mailbox couldn't be deleted."
      fi
    else
      echo "Mailbox directory '/var/mail/${MAILARR[1]}/${MAILARR[0]}' did not exist."
    fi
  done

) 200< "${DATABASE}"