#! /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/helpers/index.sh
source /usr/local/bin/helpers/index.sh

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
{
  printf '%s' "${PURPLE}DELMAILUSER${RED}(${YELLOW}8${RED})

${ORANGE}NAME${RESET}
    delmailuser - delete a user and related data

${ORANGE}SYNOPSIS${RESET}
    ./setup.sh email del [ OPTIONS ] { <MAIL ADDRESS> [<MAIL ADDRESS>${RED}...${RESET}] ${RED}|${RESET} help }

${ORANGE}DESCRIPTION${RESET}
    Delete a mail user, aliases, quotas and mail data.

${ORANGE}OPTIONS${RESET}
    -y
        Indicate that ${LWHITE}all mail data${RESET} is to be deleted without another prompt.

    -h
        Show this help dialogue.

${ORANGE}EXAMPLES${RESET}
    ${LWHITE}./setup.sh email del woohoo@some-domain.org${RESET}
        Delete the mail user, quotas and aliases, but ask
        again whether mailbox data should be deleted.

    ${LWHITE}./setup.sh email del -y test@domain.com test@domain.com${RESET}
        Delete all mail data for the users 'test' and do not
        prompt to ask if all mail data should be deleted.

${ORANGE}EXIT STATUS${RESET}
    Exit status is 0 if command was successful, and 1 if there was an error.
"
}

if [[ ${1} == 'help' ]]
then
  __usage
  exit 0
fi

while getopts ":yYh" OPT
do
  case "${OPT}" in
    ( 'y' | 'Y' )
      MAILDEL=true
      ;;

    ( 'h' )
      __usage
      exit 0
      ;;

    ( * )
      __usage
      _exit_with_error "The option '${OPT}' is unknown"
      ;;

  esac
done
shift $((OPTIND-1))

[[ -z ${*} ]] && { __usage ; _exit_with_error 'No user specified' ; }
[[ -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
  if [[ ${MAILDEL_CHOSEN} =~ (y|Y|yes|Yes) ]] || [[ -z ${MAILDEL_CHOSEN} ]]
  then
    MAILDEL=true
  fi
fi

_create_lock # Protect config file with lock to avoid race conditions

for EMAIL in "${@}"
do
  ERROR=false

  USER="${EMAIL%@*}"
  DOMAIN="${EMAIL#*@}"

  # ${EMAIL} must not contain /s and other syntactic characters
  UNESCAPED_EMAIL="${EMAIL}"
  EMAIL=$(_escape "${EMAIL}")

  if [[ -f ${DATABASE} ]]
  then
    if ! sedfile --strict -i "/^${EMAIL}|/d" "${DATABASE}"
    then
      _log 'error' "'${UNESCAPED_EMAIL}' couldn't be deleted in '${DATABASE}'"
      ERROR=true
    fi
  fi

  if [[ -f ${ALIAS_DATABASE} ]]
  then
    # delete all aliases where the user is the only recipient( " ${EMAIL}" )
    # delete user only for all aliases that deliver to multiple recipients ( ",${EMAIL}" "${EMAIL,}" )
    if sed -i \
      -e "/ ${EMAIL}$/d" -e "s/,${EMAIL}//g" -e "s/${EMAIL},//g" \
      "${ALIAS_DATABASE}"
    then
      _log 'info' "'${UNESCAPED_EMAIL}' and potential aliases deleted"
    else
      _log 'error' "Aliases for '${UNESCAPED_EMAIL}' couldn't be deleted in '${ALIAS_DATABASE}'"
      ERROR=true
    fi
  fi

  # remove quota directives
  if [[ -f ${QUOTA_DATABASE} ]]
  then
    if ! sedfile --strict -i -e "/^${EMAIL}:.*$/d" "${QUOTA_DATABASE}"
    then
      _log 'warn' "Quota for '${UNESCAPED_EMAIL}' couldn't be deleted in '${QUOTA_DATABASE}'"
    fi
  fi

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

  if [[ -e "/var/mail/${DOMAIN}/${USER}" ]]
  then
    if rm -R "/var/mail/${DOMAIN}/${USER}"
    then
      _log 'info' 'Mailbox deleted'
    else
      _log 'error' 'Mailbox could not be deleted'
      ERROR=true
    fi
    rmdir "/var/mail/${DOMAIN}" &>/dev/null
  else
    log 'error' "Mailbox directory '/var/mail/${DOMAIN}/${USER}' did not exist"
    ERROR=true
  fi

  ${ERROR} && _exit_with_error 'See the messages above.'
done

exit 0