#!/bin/bash
# 部署脚本 - 将构建好的 course-web 前端项目上传到服务器
# 支持版本管理和回滚
# 使用方法: ./deploy.sh [deploy|rollback]

SERVER_IP="101.200.208.45"
USERNAME="root"
REMOTE_ROOT="/data/www"
APP_NAME="course-of-life"
DEPLOY_ROOT="${REMOTE_ROOT}/${APP_NAME}-releases"
SYMLINK_PATH="${REMOTE_ROOT}/${APP_NAME}"

TIMESTAMP=$(date +%Y%m%d%H%M%S)
RELEASE_PATH="${DEPLOY_ROOT}/${TIMESTAMP}"

function deploy() {
    echo "🚀 开始部署 ${APP_NAME} 到服务器..."

    # 1. 环境检查
    if ! command -v npm &> /dev/null; then
        echo "❌ 错误: 未找到npm命令"
        exit 1
    fi

    # 2. 项目构建
    echo "🧹 清理旧构建..."
    rm -rf dist

    echo "📦 开始构建..."
    if ! npm run build; then
        echo "❌ 构建失败"
        exit 1
    fi

    if [ ! -d "dist" ]; then
        echo "❌ 错误: dist目录不存在"
        exit 1
    fi

    # 3. 准备远程目录
    echo "📁 准备远程目录: ${RELEASE_PATH}"
    ssh "${USERNAME}@${SERVER_IP}" "mkdir -p ${RELEASE_PATH}" || {
        echo "❌ 无法创建远程目录"
        exit 1
    }

    # 4. 上传文件
    echo "📤 上传文件..."
    if scp -r dist/* "${USERNAME}@${SERVER_IP}:${RELEASE_PATH}/"; then
        echo "✅ 文件上传成功"
    else
        echo "❌ 文件上传失败"
        # 清理失败的发布目录
        ssh "${USERNAME}@${SERVER_IP}" "rm -rf ${RELEASE_PATH}"
        exit 1
    fi

    # 5. 切换版本 (原子操作)
    echo "🔄 切换当前版本..."
    # ln -sfn: force update symlink
    ssh "${USERNAME}@${SERVER_IP}" "ln -sfn ${RELEASE_PATH} ${SYMLINK_PATH}" || {
        echo "❌ 版本切换失败"
        exit 1
    }

    # 6. 权限修正
    ssh "${USERNAME}@${SERVER_IP}" "chmod -R 755 ${RELEASE_PATH}"

    # 7. 清理旧版本 (保留最近5个)
    echo "🧹 清理旧版本..."
    ssh "${USERNAME}@${SERVER_IP}" "cd ${DEPLOY_ROOT} && ls -t | tail -n +6 | xargs -I {} rm -rf {}"

    echo "✅ 部署完成！"
    echo "🌍 访问地址: http://${SERVER_IP}/${APP_NAME}/"
}

function rollback() {
    echo "Reverting to previous version..."
    # 获取倒数第二个版本目录
    PREV_VERSION=$(ssh "${USERNAME}@${SERVER_IP}" "cd ${DEPLOY_ROOT} && ls -t | head -n 2 | tail -n 1")
    
    if [ -z "$PREV_VERSION" ]; then
        echo "❌ 没有可回滚的版本"
        exit 1
    fi

    echo "🔄 回滚到版本: ${PREV_VERSION}"
    ssh "${USERNAME}@${SERVER_IP}" "ln -sfn ${DEPLOY_ROOT}/${PREV_VERSION} ${SYMLINK_PATH}" && \
    echo "✅ 回滚成功" || echo "❌ 回滚失败"
}

# 主逻辑
case "$1" in
    rollback)
        rollback
        ;;
    *)
        deploy
        ;;
esac