#!/usr/bin/env bash
set -euo pipefail

require() { command -v "$1" &>/dev/null || {
	echo "error: $1 not found"
	exit 1
}; }
require git
require git-cliff
require jq

# --- pre-flight ---

if [ "$#" -gt 1 ]; then
	echo "usage: hack/release [version]"
	exit 1
fi

manual=${1:-}
if [ -n "$manual" ]; then
	manual=${manual#v}
	[[ $manual =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]] || {
		echo "error: invalid version '$manual' (expected e.g. 3.4.0)"
		exit 1
	}
fi

if [ -n "$(git status --porcelain)" ]; then
	echo "error: working tree is dirty"
	exit 1
fi

if [ -n "$manual" ]; then
	next=$manual
else
	next=$(git-cliff --bumped-version 2>/dev/null | sed 's/^v//')
fi

if git tag | grep -qx "v$next"; then
	if [ -n "$manual" ]; then
		echo "error: tag v$next already exists"
		exit 1
	fi
	echo "no releasable commits since v$next"
	exit 0
fi

echo "releasing -> v$next"

# --- update files ---

jq --arg v "$next" '.version = $v' package.json >package.json.tmp
mv package.json.tmp package.json

# --- run git-cliff ---
git-cliff --tag "v$next" --output CHANGELOG.md

# --- remove newlines ---
sed -i -e :a -e '/^\s*$/{$d;N;ba' -e '}' CHANGELOG.md

# --- commit, tag, push ---

git add package.json pnpm-lock.yaml CHANGELOG.md flake.nix
git commit --no-verify -m "chore: release v$next"
git tag -a "v$next" -m "release v$next"
git push
git push --tags

echo "released v$next"