#!/bin/bash

set -euo pipefail

declare -r VERSION=${1:-}
declare -r MESSAGE=${2:-"Release ${VERSION}"}
declare -r TAGBRANCH=main
declare -r RELEASEBRANCH=dev
declare CURRENTBRANCH=""

showHelp() {
	echo "Usage: ./_release.sh <version> [message]"
}

cleanup() {
	if [ -n "${CURRENTBRANCH}" ] && [ "${CURRENTBRANCH}" != "$(git rev-parse --abbrev-ref HEAD)" ]; then
		git checkout "${CURRENTBRANCH}" >/dev/null 2>&1 || true
	fi
}

trap cleanup EXIT

if [ "${VERSION}" == "" ]; then
	showHelp
	echo ""
	echo "No version provided!"
	exit 1
fi

CURRENTBRANCH=$(git rev-parse --abbrev-ref HEAD)

if [ "${CURRENTBRANCH}" != "${RELEASEBRANCH}" ]; then
	echo "You are not on the ${RELEASEBRANCH} branch!"
	echo "Use ${RELEASEBRANCH} branch to make a release!"
	exit 1
fi

if ! git diff --quiet || ! git diff --cached --quiet; then
	echo "Working tree is not clean. Commit or stash your changes first."
	exit 1
fi

if git rev-parse -q --verify "refs/tags/${VERSION}" >/dev/null; then
	echo "Tag ${VERSION} already exists."
	exit 1
fi

git checkout "${TAGBRANCH}"
git merge "${RELEASEBRANCH}"
git push origin "${TAGBRANCH}"
git tag -a "${VERSION}" -m "${MESSAGE}"
git push origin "${VERSION}"