#!/usr/bin/env miaou-bash

# CONSTANTS

# FUNCTIONS

function usage {
  local basename
  basename=$(basename "$0")
  echo Usage:
  echo -e "\t$basename <CONTAINER_NAME> [--] <COMMAND>"
  echo -e "\t(PIPE or HEREDOC are allowed too)"
  echo
  echo "Examples:"
  echo -e "\t$basename container1 uptime"
  echo -e "\t$basename container1 -- ls -la"
  echo -e "\techo 'uptime' | $basename container1 # (PIPE usage)"
  # echo -e "\t$basename container1 <<EOF\n\tls -l\n\tuptime\n\tEOF"
}

function parse_options {
  COMMAND_LINE=()
  while [[ $# -gt 0 ]]; do
    case "$1" in
    --help | -h) usage && exit 0 ;;
    --)
      shift
      COMMAND_LINE+=("$@")
      break
      ;;
    -*) echo >&2 "Unknown option: $1" && usage && exit 2 ;;
    *)
      if [[ ! -v CONTAINER ]]; then
        CONTAINER=$1
      else
        COMMAND_LINE+=("$1")
      fi
      ;;
    esac
    shift
  done
  [[ ! -v CONTAINER ]] && usage && exit 1
  if [[ -t 0 ]]; then
    ((${#COMMAND_LINE[@]} == 0)) && usage && exit 2
  else
    HEREDOC=true
  fi

}

function exec {
  if [[ -v HEREDOC ]]; then
    # TODO: test whether miaou-bash mounted within container
    script="miaou-bash <<EOF
    $(cat)
EOF"
    if ! incus exec -t "$CONTAINER" -- bash -lc "$script"; then
      # TO BYPASS the miaou-exec error itself!
      builtin exit $?
    fi
  else
    incus exec "$CONTAINER" -- "${COMMAND_LINE[@]}"
  fi
}

# MAIN

parse_options "$@"
exec