#!/usr/bin/env bash

git_status=$(git status --porcelain)
if [[ ! -z $git_status ]]; then
	echo -e "\e[31muncommitted state:\e[0m"
	git status -s
	echo -e "\e[31mplease commit or tidy uncommitted state before running release\e[0m"
	exit
fi

# takes the tag as an argument (e.g. v0.1.0)
if [ -n "$1" ]; then
	if ! $(echo "${1}" | grep -q '^v[0-9]\+\.[0-9]\+\.[0-9]\+$'); then
		echo -e "\e[31m${1} not a version of the expected format; please use v#.#.# format\e[0m"
		exit
	fi
	since_flag="--unreleased"
	if [[ ! -z "${2}" ]]; then
		since_flag="${2}"
	fi
	# update the version
	msg="# managed by release.sh"
	sed "s/^version = .* $msg$/version = \"${1#v}\" $msg/" -i Cargo.toml
	# update the changelog
	git cliff --sort newest $since_flag --tag "$1" --prepend CHANGELOG.md
	git diff
	echo -e -n "\e[33mProceed? \e[0m"
	read -n 1 -s -p "[y/N] " proceed
	echo
	if [[ "${proceed}" != "y" ]]; then
		echo -e "\e[31maborting; leaving dirty state:\e[0m"
		git status -s
		exit
	fi
	git add -A
	git commit -m "chore(release): prepare for $1"
	git show
	# generate a changelog for the tag message
	export GIT_CLIFF_TEMPLATE="\
    {% for group, commits in commits | group_by(attribute=\"group\") %}
    {{ group | upper_first }}\
      {% for commit in commits %}
      - {% if commit.breaking %}(breaking) {% endif %}{{ commit.message | upper_first }} ({{ commit.id | truncate(length=7, end=\"\") }})\
        {% endfor %}
        {% endfor %}"
	changelog=$(git cliff --sort newest $since_flag --strip all)
	git tag "$1" -m "Release $1" -m "$changelog"
	git show -q "$1"
else
	echo "warn: please provide a tag"
fi