#!/usr/bin/env bash

set -e
TMP_FILE="/tmp/.medic-rs.fmt.md"

assert_file() {
  if [ ! -f "$1" ]; then
    echo "error: file '${1}' does not exist"
    exit 1
  fi
}

check_all_files() {
  for file in $(find . -name '*.md' -not -path "./target/*"); do
    check_file "${file}"
  done
}

check_file() {
  local file=$1

  pandoc --from=gfm --to=gfm --wrap=auto "${file}" > "${TMP_FILE}"
  set +e
  diff "${file}" "${TMP_FILE}" >/dev/null
  status=$?
  set -e
  rm ${TMP_FILE}

  if [ $status -ne 0 ]; then
    echo "error: ${file} has not been properly formatted" >&2
    echo "remedy: $0 ${file}" >&2
    return 1
  fi
}

format_all_files() {
  for file in $(find . -name '*.md' -not -path "./target/*"); do
    format_file "${file}"
  done
}

format_file() {
  local file=$1

  pandoc --from=gfm --to=gfm --wrap=auto "${file}" > "${TMP_FILE}"
  set +e
  diff "${file}" "${TMP_FILE}" >/dev/null
  status=$?
  set -e

  if [ $status -ne 0 ]; then
    echo "${file}: formatting"
    mv ${TMP_FILE} ${file}
  else
    rm ${TMP_FILE}
    echo "${file}: no change"
  fi
}

main() {
  case $1 in
    --all)
      format_all_files
      ;;

    --cd)
      cd $2
      shift
      shift
      ;;

    --check)
      check_all_files
      ;;

    *.md)
      assert_file $1
      format_file $1
      ;;

    *)
      echo "unknown flag or file type: '$1'"
      echo ""
      echo "USAGE"
      echo "  $0 <file> or <path>"
      echo "  $0 --all"
      echo "  $0 --cd <path>"
      echo "  $0 --check"
      exit 1
      ;;
  esac
}

main $@