#!/usr/bin/env bash

SCRIPT_PATH=$(realpath -s "${0}")
SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
SCRIPT=$(basename "$SCRIPT_PATH")

usage() {
  cat <<EOF
Usage: $SCRIPT [OPTIONS]... COMMAND [COMMAND OPTIONS]

Manage DNS zones.

Commands:
 * add             add new zone
 * delete          delete zone
 * help [COMMAND]  show help message of commands
 * list            show zone content

Options:
  -c, --config     path to config file
  -h, --help       print this help message

EOF
  exit
}

config_file="/etc/dns-manager/config.sh"
cmd=""

while [ -n "$1" ]; do
  opt=$1
  shift
  case "$opt" in
    -c|--config)
      if [ -z "$1" ]; then
        echo "$SCRIPT: missing argument to option -- '$opt'" >&2
	exit 1
      fi
      config_file=$1
      shift
    ;;
    -h|--help)
      usage
    ;;
    -*)
      echo "$SCRIPT: invalid option -- '$opt'" >&2
      exit 1
    ;;
    *)
      cmd=$opt
      break
    ;;
  esac
done

cmd=${cmd,,:-help}

source "$config_file" || exit 2

LIB_DIR=${LIB_DIR:-$SCRIPT_DIR/lib}
source "$LIB_DIR"/dns.sh || exit 3
source "$LIB_DIR"/output.sh || exit 3

params="--interactive"

if [ "$cmd" == "help" ]; then
  params="--help"
  cmd=${1,,}
  shift
fi

case "$cmd" in
  add|delete|list)
    "$SCRIPT_DIR"/dns-zone-$cmd $params "$@"
  ;;
  "")
    usage
  ;;
  *)
    echo "$SCRIPT: invalid command -- '$cmd'" >&2
    exit 5
  ;;
esac