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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=common.sh
source "${SCRIPT_DIR}/common.sh"

NEW_TAG="${1:-}"
SUMMARY="${2:-}"
PREV_TAG="${3:-}"

if [[ -z "$NEW_TAG" ]]; then
  echo "Usage: generate-release-notes.sh <new-tag> [summary] [prev-tag]" >&2
  exit 1
fi

if [[ -z "$PREV_TAG" ]]; then
  PREV_TAG=$(git describe --tags --abbrev=0 "${NEW_TAG}^" 2>/dev/null || git describe --tags --abbrev=0 2>/dev/null || true)
fi

NOTES="## Summary"
if [[ -n "$SUMMARY" ]]; then
  NOTES="${NOTES}

$(strip_bump_prefix "$SUMMARY")"
else
  NOTES="${NOTES}

Automated release ${NEW_TAG}."
fi

if [[ -n "$PREV_TAG" ]]; then
  NOTES="${NOTES}

## Changes since ${PREV_TAG}

$(commits_since "$PREV_TAG")"
else
  NOTES="${NOTES}

## Changes

$(commits_between "" HEAD 20)"
fi

if [[ -n "${GITHUB_OUTPUT:-}" ]]; then
  {
    echo 'body<<EOF'
    echo "$NOTES"
    echo 'EOF'
  } >> "$GITHUB_OUTPUT"
else
  echo "$NOTES"
fi