#!/usr/bin/env bash
set -euo pipefail
parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" || exit ; pwd -P )
cd "$parent_path" || exit

last_commit_subject=$(git log -1 --format=%s)
if [[ "$last_commit_subject" =~ ^Version\ Bump ]]; then
  echo "Last commit is already a version bump (\"$last_commit_subject\"). Nothing to do."
  exit 0
fi

if [ 1 -eq "$#" ]
then
  current_version=$(grep -m 1 '^version = ' pyproject.toml | sed -E 's/version = "([^"]+)"/\1/')
  IFS='.' read -r major minor patch <<< "$current_version"

  if [ "$1" == "major" ]; then
    major=$((major + 1))
    minor=0
    patch=0
    new_version="${major}.${minor}.${patch}"
  elif [ "$1" == "minor" ]; then
    minor=$((minor + 1))
    patch=0
    new_version="${major}.${minor}.${patch}"
  elif [ "$1" == "patch" ]; then
    patch=$((patch + 1))
    new_version="${major}.${minor}.${patch}"
  elif [[ "$1" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
    new_version="$1"
  else
    echo "Invalid argument: must be 'major', 'minor', 'patch', or a specific version (e.g. 1.2.3)"
    exit 1
  fi

  echo "Version bump from $current_version to $new_version"
  sed --in-place --regexp-extended 's/version = "([0-9]{1,2}.[0-9]+.[0-9]+)"/version = "'"$new_version"'"/g' pyproject.toml
  git add pyproject.toml
else
  echo "No version bump"
  echo "Usage: $0 <major|minor|patch|version_string>"
  exit 1
fi