#!/bin/bash
# Determine whether a release looks okay.
#
#  Copyright (C) 2014-2023 Ryan Specialty, LLC.
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This should be run as part of a CI system to prohibit bad tags.

declare -r RELEASE_FILE="${RELEASE_FILE:-RELEASES.md}"


tag-date()
{
  local -r t="${1?Missing tag}"

  git show "$t" --date=short \
    | awk '/^Date: / { print $2; exit }'
}


declare -r tag=$(git describe --abbrev=0)
declare -r tagdate=$(tag-date "$tag")


suggest-fix()
{
  echo
  echo "Here are the commands you should use to correct this"
  echo "bad tag:"
  echo "  \$ git tag -d $tag"
  echo "  \$ tools/mkrelease $tag"
  echo "  \$ git push -f --tags $tag"
}


# Check for NEXT heading first so that we can provide more clear guidance
# for what to do.
echo -n "checking $RELEASE_FILE for missing 'NEXT' heading... "
! grep -q '^NEXT$' "$RELEASE_FILE" || {
  echo "FAIL"
  echo "error: $RELEASE_FILE contains 'NEXT' heading" >&2
  echo
  echo "$RELEASE_FILE must be updated to replace the 'NEXT'"
  echo "heading with the version and date being deployed."
  echo
  echo "The script in tools/mkrelease will do this for you."

  suggest-fix
  exit 1
}
echo "OK"

# A missing NEXT heading could also mean that no release notes exist at all
# for this tag.  Check.
echo -n "checking $RELEASE_FILE for '$tag' heading... "
grep -q "^$tag ($tagdate)\$" "$RELEASE_FILE" || {
  echo "FAIL"
  echo "error: $RELEASE_FILE does not contain heading for $tag" >&2
  echo
  echo "$RELEASE_FILE has not been updated with release notes"
  echo "for $tag."
  echo
  echo "The heading should read: '$tag ($tagdate)'"

  suggest-fix
  exit 1
}
echo "OK"