#!/bin/bash
set -eo pipefail
[[ $TRACE ]] && set -x

if [[ -e /usr/share/debconf/confmodule ]]; then
  # shellcheck disable=SC1091
  . /usr/share/debconf/confmodule
fi

setup_dokku_installer() {
  NGINX_BASE_PATH="$1"
  NGINX_INIT_NAME="$2"

  NGINX_CONF="${NGINX_BASE_PATH}/conf.d/dokku-installer.conf"

  rm -f $NGINX_CONF
  touch $NGINX_CONF

  {
    echo 'upstream dokku-installer { server 127.0.0.1:2000; }'
    echo 'server {'
    echo '  listen      80;'
    echo '  location    / {'
    echo '    proxy_pass  http://dokku-installer;'
    echo '  }'
    echo '}'
  } >>$NGINX_CONF

  rm -f $NGINX_BASE_PATH/sites-enabled/*
  DOKKU_DISTRO="$(
    . /etc/os-release >/dev/null 2>&1 || true
    echo "$ID"
  )"
  case "$DOKKU_DISTRO" in
    debian)
      /usr/sbin/invoke-rc.d "$NGINX_INIT_NAME" reload || /usr/sbin/invoke-rc.d "$NGINX_INIT_NAME" start
      ;;
    ubuntu)
      if [[ -x /usr/bin/sv ]]; then
        /usr/bin/sv reload "$NGINX_INIT_NAME" || /usr/bin/sv start "$NGINX_INIT_NAME"
      else
        "/etc/init.d/$NGINX_INIT_NAME" reload || "/etc/init.d/$NGINX_INIT_NAME" start
      fi
      ;;
  esac
}

case "$1" in
  install)
    db_get "dokku/web_config"
    if [ "$RET" = "true" ]; then
      if [[ -x /usr/bin/openresty ]]; then
        setup_dokku_installer "/usr/local/openresty/nginx/conf" "openresty"
      else
        setup_dokku_installer "/etc/nginx" "nginx"
      fi
    fi

    db_get "dokku/skip_key_file"
    if [ -z "${DEBCONF_RECONFIGURE}" ] && [ "$RET" != "true" ]; then
      db_get "dokku/key_file"
      if [ ! -f "$RET" ]; then
        echo "Error: keyfile '$RET' not found." >&2
        echo "       To deploy, you will need to generate a keypair and add with 'dokku ssh-keys:add'." >&2
        db_reset "dokku/key_file"
      fi
    fi
    ;;

  upgrade) ;;

  \
    abort-upgrade) ;;

  \
    *)
    echo "preinst called with unknown argument \`$1'" >&2
    exit 1
    ;;
esac

exit 0