#!/bin/bash
# Git pre-commit hook：提交前自动 format，analyze 有 error 则拦截提交
#
# 安装：bash scripts/setup.sh（setup.sh 自动把本文件复制到 .git/hooks/pre-commit）
# 手动安装：cp scripts/pre-commit .git/hooks/pre-commit && chmod +x .git/hooks/pre-commit

set -euo pipefail

ROOT_DIR="$(git rev-parse --show-toplevel)"
DART="$(command -v dart 2>/dev/null || echo "")"

if [[ -z "$DART" ]]; then
  echo "[pre-commit] dart not found, skipping checks."
  exit 0
fi

# ── pubspec.lock 保护 ────────────────────────────────────────────────────────
# flutter run / flutter build 会在未经授权的情况下触发 pub get 并修改 lock。
# 规则：lock 有未暂存的改动（意外修改）→ 自动还原；
#       开发者主动 git add pubspec.lock 后（暂存）→ 正常放行。
LOCK_UNSTAGED=$(git diff --name-only pubspec.lock 2>/dev/null || true)
LOCK_STAGED=$(git diff --cached --name-only pubspec.lock 2>/dev/null || true)

if [[ -n "$LOCK_UNSTAGED" && -z "$LOCK_STAGED" ]]; then
  git checkout HEAD -- pubspec.lock
  echo "[pre-commit] pubspec.lock was auto-modified by flutter, restored to HEAD."
  echo "  To intentionally update: run 'dart pub get' or 'dart pub upgrade',"
  echo "  then 'git add pubspec.lock' before committing."
fi

# ── dart format + analyze ────────────────────────────────────────────────────
STAGED_DART=$(git diff --cached --name-only --diff-filter=ACM | grep '\.dart$' || true)

if [[ -z "$STAGED_DART" ]]; then
  exit 0
fi

echo "[pre-commit] formatting staged dart files..."
echo "$STAGED_DART" | xargs dart format --line-length=80
echo "$STAGED_DART" | xargs git add

echo "[pre-commit] running dart analyze..."
cd "$ROOT_DIR"

ANALYZE_OUTPUT=$(dart analyze 2>&1)

if echo "$ANALYZE_OUTPUT" | grep -q "^  error"; then
  echo "[pre-commit] dart analyze found errors, commit blocked."
  echo "$ANALYZE_OUTPUT" | grep "^  error"
  exit 1
fi

if echo "$ANALYZE_OUTPUT" | grep -q "^  warning"; then
  echo "[pre-commit] dart analyze found warnings, commit blocked."
  echo "$ANALYZE_OUTPUT" | grep "^  warning"
  exit 1
fi

echo "[pre-commit] all checks passed."
exit 0