#! /bin/bash

# shellcheck source=../scripts/helpers/index.sh
source /usr/local/bin/helpers/index.sh

function _main
{
  [[ ${1:-} == 'help' ]] && { __usage ; exit 0 ; }

  local MAIL_ACCOUNT="${1}"
  shift
  local QUOTA="${*}"

  _validate_parameters
  _manage_dovecot_quota_update "${MAIL_ACCOUNT}" "${QUOTA}"
}

function __usage
{
  printf '%s' "${PURPLE}setquota${RED}(${YELLOW}8${RED})

${ORANGE}USAGE${RESET}
    ./setup.sh quota set <MAIL ACCOUNT> [<QUOTA>]

${ORANGE}OPTIONS${RESET}
    ${BLUE}Generic Program Information${RESET}
        help       Print the usage information.

${ORANGE}DESCRIPTION${RESET}
    Set a quota (storage limit) for an existing mail account.

    The quota value is in bytes. You may use a unit suffix for convenience,
    such as 10M for 10 MebiBytes (MiB). A value of 0 opts out of enforcing quota.

${ORANGE}EXAMPLES${RESET}
    ${LWHITE}./setup.sh quota set user@example.com 5G${RESET}
        The account 'user@example.com' is restricted to a 5GiB storage limit.

${ORANGE}EXIT STATUS${RESET}
    Exit status is 0 if command was successful. If wrong arguments are provided
    or arguments contain errors, the script will exit early with exit status 1.

"
}

function _validate_parameters
{
  # MAIL_ACCOUNT
  _arg_expect_mail_account
  _account_should_already_exist

  # QUOTA
  _quota_request_if_missing
  _quota_unit_is_valid
}

function _quota_request_if_missing
{
  if [[ -z ${QUOTA} ]]
  then
    read -r -p 'Enter quota (e.g. 10M): ' QUOTA
    echo
    [[ -z "${QUOTA}" ]] && _exit_with_error 'Quota must not be empty (use 0 for unlimited quota)'
  fi
}

function _quota_unit_is_valid
{
  if ! grep -qE "^([0-9]+(B|k|M|G|T)|0)\$" <<< "${QUOTA}"
  then
    __usage
    _exit_with_error 'Invalid quota format. e.g. 302M (B (byte), k (kilobyte), M (megabyte), G (gigabyte) or T (terabyte))'
  fi
}

_main "${@}"