#!/usr/bin/env bash
# sync-upstream.sh
# 将 upstream/main 的最新代码同步合并到本地 main 分支
# 用法: ./scripts/sync-upstream.sh [upstream-remote] [upstream-branch]

set -euo pipefail

# ── 配置 ────────────────────────────────────────────────────────────────────
UPSTREAM="${1:-upstream}"
UPSTREAM_BRANCH="${2:-main}"
LOCAL_BRANCH="main"
MERGE_MSG="merge: 同步 ${UPSTREAM}/${UPSTREAM_BRANCH} 新功能到定制版本"

# ── 颜色输出 ─────────────────────────────────────────────────────────────────
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
NC='\033[0m'

info()    { echo -e "${BLUE}[INFO]${NC}  $*"; }
ok()      { echo -e "${GREEN}[OK]${NC}    $*"; }
warn()    { echo -e "${YELLOW}[WARN]${NC}  $*"; }
error()   { echo -e "${RED}[ERROR]${NC} $*"; }
step()    { echo -e "\n${CYAN}▶ $*${NC}"; }

# ── 检查：必须在 git 仓库内 ───────────────────────────────────────────────────
if ! git rev-parse --git-dir &>/dev/null; then
  error "当前目录不是 git 仓库"
  exit 1
fi

# ── 检查：必须在 LOCAL_BRANCH 上 ─────────────────────────────────────────────
CURRENT_BRANCH=$(git branch --show-current)
if [[ "$CURRENT_BRANCH" != "$LOCAL_BRANCH" ]]; then
  error "当前分支是 '$CURRENT_BRANCH'，请先切换到 '$LOCAL_BRANCH'"
  error "  git checkout $LOCAL_BRANCH"
  exit 1
fi

# ── 检查：是否有未提交的改动 ──────────────────────────────────────────────────
step "检查工作区状态"
DIRTY=$(git status --porcelain)
if [[ -n "$DIRTY" ]]; then
  warn "检测到未提交的本地修改："
  git status --short
  echo ""
  echo -e "  ${YELLOW}选项：${NC}"
  echo "  [1] 自动提交为 WIP commit，合并完成后可再整理（推荐）"
  echo "  [2] 退出，手动处理后再运行"
  echo ""
  read -rp "请选择 [1/2]: " choice
  case "$choice" in
    1)
      step "提交本地修改为 WIP commit"
      git add -A
      git commit -m "chore: WIP - 合并 upstream 前保存本地修改"
      ok "WIP commit 已创建"
      ;;
    *)
      info "已退出，请手动处理后再运行此脚本"
      exit 0
      ;;
  esac
fi

# ── 拉取 upstream ─────────────────────────────────────────────────────────────
step "拉取 ${UPSTREAM}/${UPSTREAM_BRANCH}"
if ! git fetch "$UPSTREAM" 2>&1; then
  error "fetch ${UPSTREAM} 失败，请检查网络或 remote 配置"
  git remote -v
  exit 1
fi

# ── 检查是否有新提交 ──────────────────────────────────────────────────────────
NEW_COMMITS=$(git log HEAD.."${UPSTREAM}/${UPSTREAM_BRANCH}" --oneline)
if [[ -z "$NEW_COMMITS" ]]; then
  ok "已是最新，无需合并"
  exit 0
fi

info "以下 upstream 提交将被合并："
echo "$NEW_COMMITS" | while IFS= read -r line; do
  echo "  + $line"
done

# ── 执行合并 ──────────────────────────────────────────────────────────────────
step "合并 ${UPSTREAM}/${UPSTREAM_BRANCH} → ${LOCAL_BRANCH}"
if git merge "${UPSTREAM}/${UPSTREAM_BRANCH}" --no-ff -m "$MERGE_MSG" 2>&1; then
  ok "合并成功，无冲突"
else
  # 有冲突
  CONFLICTS=$(git diff --name-only --diff-filter=U)
  echo ""
  error "合并产生冲突，需要手动解决以下文件："
  echo "$CONFLICTS" | while IFS= read -r f; do
    echo "  ✗ $f"
  done
  echo ""
  echo -e "${YELLOW}解决步骤：${NC}"
  echo "  1. 用编辑器打开冲突文件，搜索 <<<<<<< 并逐一解决"
  echo "  2. 解决完成后运行："
  echo "     git add <已解决的文件>"
  echo "     git commit -m \"$MERGE_MSG\""
  echo ""
  echo -e "${YELLOW}常用工具：${NC}"
  echo "  git diff                    # 查看所有冲突内容"
  echo "  git checkout --ours <file>  # 保留我们的版本"
  echo "  git checkout --theirs <file> # 保留 upstream 版本"
  echo "  npx biome check --write --unsafe  # 修复可自动修复的 lint 错误"
  echo ""
  echo -e "${YELLOW}放弃本次合并：${NC}"
  echo "  git merge --abort"
  exit 1
fi

# ── 运行 lint 检查 ────────────────────────────────────────────────────────────
step "运行 biome 检查"
if npx biome check 2>&1 | grep -q "Found.*error"; then
  warn "发现 lint 错误，尝试自动修复..."
  npx biome check --write --unsafe 2>&1 | tail -3
  # 再检查一次
  REMAINING=$(npx biome check 2>&1 | grep "Found.*error" || true)
  if [[ -n "$REMAINING" ]]; then
    warn "仍有无法自动修复的 lint 错误，请手动处理："
    npx biome check 2>&1 | grep "lint/" | grep -v "FIXABLE\|Unsafe\|i " | sort -u
  else
    ok "lint 错误已全部自动修复"
    # 如果 biome 修改了文件，需要重新提交
    if [[ -n "$(git diff --name-only)" ]]; then
      git add -A
      git commit -m "fix: 修复合并后的 lint 错误"
      ok "lint 修复已提交"
    fi
  fi
else
  ok "biome 检查通过，无错误"
fi

# ── 完成 ───────────────────────────────────────────────────────────────────────
echo ""
ok "同步完成！最新提交记录："
git log --oneline -5
echo ""
info "如需推送到远端（kxsw）："
echo "  git push kxsw main"