#!/usr/bin/env bash

set -eux -o pipefail
shopt -s failglob

SYSREPOCTL="${1}"
shift
if [[ ! -x "${SYSREPOCTL}" ]]; then
  echo "Cannot locate \$SYSREPOCTL"
  exit 1
fi

SYSREPOCFG="${1}"
shift
if [[ ! -x "${SYSREPOCFG}" ]]; then
  echo "Cannot locate \$SYSREPOCFG"
  exit 1
fi

MODE="${1}"
shift
[ "${MODE}" != "prepare" ] && [ "${MODE}" != "uninstall" ] && error "Invalid mode of operation (neither prepare nor uninstall)"

while [[ $# -gt 0 ]]; do
  if [[ "${1}" == "YANG" ]]; then
    shift
  else
    error "Error: Expected 'YANG yangfile' clause"
  fi

  YANG_FILE="${1}"
  shift
  if [[ ! -f "${YANG_FILE}" ]]; then
    echo "Error: Specified YANG file does not exist"
    exit 1
fi

  MODULE=$(basename --suffix .yang "${YANG_FILE}" | sed 's/@.*//')  # also remove part after @ from module name
  YANG_DIR=$(dirname "${YANG_FILE}")

  if [[ "${MODE}" == "prepare" ]]; then
    ${SYSREPOCTL} --uninstall "${MODULE}" || true
    ${SYSREPOCTL} --search-dirs "${YANG_DIR}" --install "${YANG_FILE}"
  elif [[ "${MODE}" == "uninstall" ]]; then
    MODULE_LIST=( "${MODULE}" "${MODULE_LIST[@]}" ) # save for later; uninstall in reverse order
  fi

  # parse and process all arguments up to next "YANG" directive
  while [[ $# -gt 0 && ${1} != "YANG" ]]; do
    if [[ "${1}" == "FEATURE" ]]; then
      shift
      FEATURE="${1}"
      shift
      [ -z "${FEATURE}" ] && error "Error: FEATURE requires an argument"

      if [[ "${MODE}" == "prepare" ]]; then
        ${SYSREPOCTL} --change ${MODULE} --enable-feature ${FEATURE}
      fi
    elif [[ "${1}" == "JSON" || "${1}" == "XML" ]]; then
      FORMAT="${1}"
      shift
      DATA_FILE="${1}"
      shift
      if [[ "${MODE}" == "prepare" ]]; then
        if [[ ! -f "${DATA_FILE}" ]]; then
          echo "Error: ${FORMAT} data file ${DATA_FILE} does not exist"
          exit 1
        fi
        # If the module is already installed (not just scheduled for installation), then --import should be used. If the
        # module needs starting data (mandatory nodes), then --new-data should be used (which completes the
        # installation). Let's just try both the methods and one of them should work
        ${SYSREPOCFG} --datastore=startup --format="${FORMAT,,}" --module="${MODULE}" --import="${DATA_FILE}" -w || \
        ${SYSREPOCFG} --datastore=startup --format="${FORMAT,,}" --module="${MODULE}" --new-data="${DATA_FILE}" -w
      fi
    fi
  done
done

if [[ "${MODE}" == "uninstall" ]]; then
  for module in "${MODULE_LIST[@]}"; do
    ${SYSREPOCTL} --uninstall "${module}"
  done
fi