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

root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
tag="${1:-${GITHUB_REF_NAME:-}}"
version="$(sed -n 's:.*<RendezvousVersion>\(.*\)</RendezvousVersion>.*:\1:p' "$root/eng/Versions.props")"

if [[ "$tag" != "v$version" ]]; then
  echo "Release tag $tag does not match central version v$version." >&2
  exit 1
fi
if [[ -n "$(git -C "$root" status --porcelain --untracked-files=normal)" ]]; then
  echo "Release tag checkout is not clean." >&2
  exit 1
fi
if [[ "$(git -C "$root" tag --points-at HEAD --list "$tag")" != "$tag" ]]; then
  echo "Release tag $tag does not point at the checked-out commit." >&2
  exit 1
fi
if ! grep -Eq "^## $version - [0-9]{4}-[0-9]{2}-[0-9]{2}$" "$root/CHANGELOG.md"; then
  echo "CHANGELOG.md must contain a dated heading for $version." >&2
  exit 1
fi
if grep -Eq "^## $version - Unreleased$" "$root/CHANGELOG.md"; then
  echo "Release $version is still marked Unreleased." >&2
  exit 1
fi