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

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

PR_TITLE="${1:-${PR_TITLE:-}}"

if [[ -z "$PR_TITLE" ]]; then
  echo "Usage: check-pr-title.sh <pr-title>  (changed files on stdin)" >&2
  exit 1
fi

CHANGED_FILES=$(cat)

if ! has_source_changes "$CHANGED_FILES"; then
  echo "No changes under ${SOURCE_DIR}/ — PR title prefix not required."
  exit 0
fi

if title_has_bump_prefix "$PR_TITLE"; then
  echo "PR title has a valid version bump prefix."
  exit 0
fi

cat >&2 <<EOF
PR changes files under ${SOURCE_DIR}/ but the title lacks a version bump prefix.

Title: ${PR_TITLE}

When changing package source, start the PR title with one of:
  [patch] or [fix]   — bug fix
  [minor] or [feat]  — new feature
  [major] or [breaking] — breaking change

Example: [patch] Fix connection retry in RedisAdapter

See .gitea/PULL_REQUEST_TEMPLATE.md for details.
EOF
exit 1