#!/bin/bash

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

function _main
{
  _require_n_parameters_or_print_usage 2 "${@}"

  local DOMAIN="${1}"
  local HOST="${2}"
  local PORT="${3}"

  _validate_parameters
  _add_relayhost
}

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

${ORANGE}USAGE${RESET}
    ./setup.sh relay add-domain <SENDER DOMAIN> <RELAY HOST> [<RELAY PORT>]

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

${ORANGE}DESCRIPTION${RESET}
    Add a relay-host where mail sent from mail accounts of the provided
    domain will be relayed through to their destination.

    If a port is not provided it will default to 25.

    If the relay-host requires authentication, use the 'setup relay add-auth'
    command after adding the relay-host.

${ORANGE}EXAMPLES${RESET}
    ${LWHITE}./setup.sh relay add-domain example.com relay.service.test 587${RESET}
        Any mail submitted from your '@example.com' accounts will be sent via
        relay using the relay-host service at 'relay.service.test:587'.

${ORANGE}EXIT STATUS${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
{
  [[ -z ${DOMAIN} ]] && { __usage ; _exit_with_error 'No domain specified'     ; }
  [[ -z ${HOST}   ]] && { __usage ; _exit_with_error 'No relay host specified' ; }
  [[ -z ${PORT}   ]] && PORT=25
}

# Config is for sender dependent relay-host mapping,
# current support restricts senders to domain scope (port is also enforced).
function _add_relayhost
{
  local SENDER="@${DOMAIN}"
  local RELAY_HOST_ENTRY="[${HOST}]:${PORT}"
  local DATABASE_RELAY='/tmp/docker-mailserver/postfix-relaymap.cf'

  _db_entry_add_or_replace "${DATABASE_RELAY}" "${SENDER}" "${RELAY_HOST_ENTRY}"
}

_main "${@}"