#!/usr/bin/env bash
# 部署脚本公共函数（LF 换行）

# 安全拉取远程代码：有本地修改时先 stash，pull 失败不中断部署
git_update_safe() {
  local repo_dir="${1:?}"
  cd "$repo_dir"

  if [ ! -d .git ]; then
    return 0
  fi

  if [ "${DEPLOY_SKIP_GIT_PULL:-}" = "1" ]; then
    echo "    已跳过 git pull (DEPLOY_SKIP_GIT_PULL=1)"
    return 0
  fi

  local stashed=0
  if ! git diff --quiet 2>/dev/null || ! git diff --cached --quiet 2>/dev/null; then
    echo "    检测到未提交修改，暂存到 git stash..."
    if git stash push -m "deploy-auto-$(date +%Y%m%d%H%M%S)"; then
      stashed=1
    else
      echo "    警告: stash 失败，将尝试直接 pull"
    fi
  fi

  if git pull --rebase; then
    echo "    代码已更新"
  else
    echo "    警告: git pull 失败，使用当前目录代码继续部署"
  fi

  if [ "$stashed" = 1 ]; then
    echo "    恢复本地修改 (git stash pop)..."
    git stash pop || echo "    提示: stash 恢复冲突时可手动处理: git stash list"
  fi
}

# 创建 .venv 并安装依赖（不依赖系统 pip）
ensure_python_venv() {
  local repo_dir="${1:?}"
  cd "$repo_dir"

  local venv_python="${repo_dir}/.venv/bin/python"
  local venv_pip="${repo_dir}/.venv/bin/pip"

  if [ ! -x "$venv_python" ]; then
    echo "    创建虚拟环境 .venv ..."
    if ! python3 -m venv .venv 2>/dev/null; then
      echo "    安装 python3-venv（需要 root）..."
      if command -v apt-get &>/dev/null; then
        sudo apt-get update -qq
        sudo DEBIAN_FRONTEND=noninteractive apt-get install -y -qq python3-venv python3-pip
      elif command -v yum &>/dev/null; then
        sudo yum install -y python3-pip
      elif command -v dnf &>/dev/null; then
        sudo dnf install -y python3-pip
      else
        echo "错误: 无法创建 venv，请手动安装 python3-venv 或 python3-pip"
        exit 1
      fi
      python3 -m venv .venv
    fi
  fi

  echo "    安装 Python 依赖到 .venv ..."
  "$venv_pip" install -U pip -q
  "$venv_pip" install -r backend/requirements.txt -q
  echo "    使用: $("$venv_python" --version 2>&1) ($venv_python)"
}