#!/usr/bin/env sh
set -eu

MSG_FILE="$1"
HEADER="$(sed -n '1p' "$MSG_FILE" | tr -d '\r')"

# Allow merge commits and auto-generated revert headers.
case "$HEADER" in
  "Merge "*|"Revert "*)
    exit 0
    ;;
esac

PATTERN='^(feat|enhance|fix|refactor|perf|docs|test|build|ci|chore|revert)(\([a-zA-Z0-9._/-]+\))?: .+$'

if ! printf '%s\n' "$HEADER" | grep -Eq "$PATTERN"; then
  echo "提交信息格式不符合规范。" >&2
  echo "要求: <type>(<scope>): <subject> 或 <type>: <subject>" >&2
  echo "示例: enhance(ui): 优化首页按钮交互反馈与提示文案" >&2
  exit 1
fi

# Ensure subject contains at least one Chinese character.
if ! printf '%s\n' "$HEADER" | grep -Eq '[一-龥]'; then
  echo "提交信息必须使用中文（subject 至少包含一个中文字符）。" >&2
  exit 1
fi

# Reject sentence-ending Chinese period in header.
if printf '%s\n' "$HEADER" | grep -Eq '。$'; then
  echo "subject 不要以句号结尾。" >&2
  exit 1
fi

exit 0