# Copyright (C) 2023 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

AC_PREREQ([2.69])
AC_INIT([mumble-vm], [0.1], [GNUtoo@cyberdimension.org])
AC_CONFIG_SRCDIR([mumble-vm-system.scm.tmpl])
AC_PROG_AWK
AC_PROG_MKDIR_P
AM_INIT_AUTOMAKE([foreign])

AC_CHECK_PROG([GUIX], [guix], [guix])
AS_IF([test x"$GUIX" = x""],
      [AC_MSG_ERROR([guix was not found in PATH ($PATH)])])

AC_CHECK_PROG([SED], [sed], [sed])
AS_IF([test x"$SED" = x""],
      [AC_MSG_ERROR([sed was not found in PATH ($PATH)])])

AC_SUBST([DOMAIN], [])
AC_SUBST([ENABLE_WIREGUARD], [])
AC_SUBST([LETSENCRYPT_EMAIL], [])
AC_SUBST([VM_IPV4_ADDRESS], [])
AC_SUBST([VM_IPV6_ADDRESS], [])
AC_SUBST([VM_IPV4_GATEWAY], [])
AC_SUBST([VM_IPV6_GATEWAY], [])
AC_SUBST([VM_IPV4_DNS], [])
AC_SUBST([VM_IPV6_DNS], [])
AC_SUBST([VM_SSH_PUB_KEY], [])
AC_SUBST([VM_SSH_ADDRESS], [])

AC_ARG_WITH([domain],
  [AS_HELP_STRING([--with-domain=DOMAIN],
                  [Use custom domain (default=audio.experimental.a-lec.org)])],
  [DOMAIN=$withval],
  [DOMAIN=audio.experimental.a-lec.org])

AC_ARG_ENABLE(wireguard,
  [AS_HELP_STRING([--enable-wireguard],
                  [Use Wireguard to obtain a public IP address (default=disabled)])],
  [ENABLE_WIREGUARD="$enableval"],
  [ENABLE_WIREGUARD="no"])

AC_ARG_WITH([letsencrypt-email],
  [AS_HELP_STRING([--with-letsencrypt-email=LETSENCRYPT_EMAIL], [Use
  custom email address for Let's Encrypt registration and recovery
  contact. (default=cominfra@a-lec.org)])],
  [LETSENCRYPT_EMAIL=$withval],
  [LETSENCRYPT_EMAIL=cominfra@a-lec.org])

AC_ARG_WITH([vm-ipv4-address],
  [AS_HELP_STRING([--with-vm-ipv4-address=VM_IPV4_ADDRESS], [Use custom VM
  IPv4 address. (default=192.168.1.117/16)])],
  [VM_IPV4_ADDRESS=$withval],
  [VM_IPV4_ADDRESS="192.168.1.117/16"])

AC_ARG_WITH([vm-ipv6-address],
  [AS_HELP_STRING([--with-vm-ipv6-address=VM_IPV6_ADDRESS], [Use custom VM
  IPv6 address. (default=2001:910:1021::117/64)])],
  [VM_IPV6_ADDRESS=$withval],
  [VM_IPV6_ADDRESS="2001:910:1021::117/64"])

AC_ARG_WITH([vm-ipv4-gateway],
  [AS_HELP_STRING([--with-vm-ipv4-gateway=VM_IPV4_GATEWAY], [Use custom VM
  IPv4 gateway address. (default=192.168.0.1)])],
  [VM_IPV4_GATEWAY=$withval],
  [VM_IPV4_GATEWAY="192.168.0.1"])

AC_ARG_WITH([vm-ipv6-gateway],
  [AS_HELP_STRING([--with-vm-ipv6-gateway=VM_IPV6_GATEWAY], [Use custom VM
  IPv6 gateway address. (default=2001:910:1021::1)])],
  [VM_IPV6_GATEWAY=$withval],
  [VM_IPV6_GATEWAY="2001:910:1021::1"])

AC_ARG_WITH([vm-ipv4-dns],
  [AS_HELP_STRING([--with-vm-ipv4-dns=VM_IPV4_DNS], [Use custom VM
  IPv4 dns address. (default=192.168.0.1)])],
  [VM_IPV4_DNS=$withval],
  [VM_IPV4_DNS="192.168.0.1"])

AC_ARG_WITH([vm-ipv6-dns],
  [AS_HELP_STRING([--with-vm-ipv6-dns=VM_IPV6_DNS], [Use custom VM
  IPv6 dns address. (default=2001:910:1021::1)])],
  [VM_IPV6_DNS=$withval],
  [VM_IPV6_DNS="2001:910:1021::1"])

AC_ARG_WITH([vm-ssh-public-key],
  [AS_HELP_STRING([--with-ssh-vm-public-key=VM_SSH_PUB_KEY], [Use custom VM
  SSH public key for use with 'guix deploy'. (default=\
ssh-ed25519\
 AAAAC3NzaC1lZDI1NTE5AAAAIGeMeRMT4l5mxi8snZYM+jcZ/N/EfJ25L2FU88fdbuhC)])],
  [VM_SSH_PUB_KEY=$withval],
  [VM_SSH_PUB_KEY="\
ssh-ed25519\
 AAAAC3NzaC1lZDI1NTE5AAAAIGeMeRMT4l5mxi8snZYM+jcZ/N/EfJ25L2FU88fdbuhC"])

AC_ARG_WITH([vm-ssh-address],
  [AS_HELP_STRING([--with-vm-ssh-address=VM_SSH_ADDRESS], [Use custom VM
  SSH address for use with 'guix deploy'. (default=audio.experimental.a-lec.org)])],
  [VM_SSH_ADDRESS=$withval],
  [VM_SSH_ADDRESS="audio.experimental.a-lec.org"])

AC_CONFIG_FILES([Makefile])
AC_OUTPUT

echo
echo "Configuration options:"
echo "======================"
echo "- Domain: $DOMAIN"
echo "- Let's Encrypt email: $LETSENCRYPT_EMAIL"
echo "- VM IPv4 settings:"
echo "  address: $VM_IPV4_ADDRESS"
echo "  gateway: $VM_IPV4_GATEWAY"
echo "  DNS: $VM_IPV4_DNS"
echo "- VM IPv6 settings:"
echo "  address: $VM_IPV6_ADDRESS"
echo "  gateway: $VM_IPV6_GATEWAY"
echo "  DNS: $VM_IPV6_DNS"
echo "- SSH settings:"
echo "  public key: $VM_SSH_PUB_KEY"
echo "  address: $VM_SSH_ADDRESS"
AS_IF([test x"$ENABLE_WIREGUARD" = x"yes"],
      [echo "- Wireguard: enabled"],
      [echo "- Wireguard: disabled"])