package main

import (
	"flag"
	"fmt"
	"net/rpc"
	"net/rpc/jsonrpc"
	"os"

	"scalib/util"
	"strings"

	"go.uber.org/zap"
)

// FileInfo 包含文件的元信息
type FileInfo struct {
	FileName string
	FileSize int64
}

// 客户端
type UpFileClient struct {
	rpcClient *rpc.Client
}

// todo 后续增加安全验证
// 使用方法 eg:  ./scalib -h 192.168.66.92:9098 -f /www/gfs/sync_zips/BIU_20251009_153640.zip /www/afs/logs/
// 主入口
func main() {
	// 启用日志
	logger := util.NewProductionLogger()
	defer logger.Sync()

	// 使用flag解析命令行参数
	remote := flag.String("h", "", "The remote server address (ip:port)")
	curPath := flag.String("f", "", "The local file path to upload")
	uploadPath := flag.String("u", "", "The remote upload path")
	flag.Parse()
	// for debug
	fmt.Printf("remote: %s, curPath: %s, uploadPath: %s\n", *remote, *curPath, *uploadPath)
	// 将服务器的信息拆分为ip和端口
	harr := strings.Split(*remote, ":")
	dstip := harr[0]
	dport := harr[1]

	// 连接到RPC服务器
	service := fmt.Sprintf("%v:%v", dstip, dport)
	client, err := NewUpFileClient(service)
	if err != nil {
		logger.Error("NewUpFileClient failed", zap.Error(err))
	}
	defer client.rpcClient.Close()
	// 调用 transferFile
	err = transferFile(client, *curPath, *uploadPath)
	if err != nil {
		logger.Error("TransferFile failed", zap.Error(err))
	}
	// fmt.Printf("TransferFile success\n")
}

// 创建新的客户端
func NewUpFileClient(addr string) (*UpFileClient, error) {
	client, err := jsonrpc.Dial("tcp", addr)
	if err != nil {
		return nil, err
	}
	return &UpFileClient{rpcClient: client}, nil
}

// 传输文件
func transferFile(c *UpFileClient, curPath string, uploadPath string) error {

	// 发送文件信息
	fmt.Printf("TransferFile filePath: %s, uploadPath: %s\n", curPath, uploadPath)
	// 获取文件信息
	fileInfo, err := os.Stat(curPath)
	if err != nil {
		// panic(err)
		// fmt.Printf("获取文件信息失败: %v\n", err)
		return err
	}

	// 异步
	go func() {
		// 发送文件信息
		var reply string
		c.rpcClient.Call("UpFileService.SendFileInfo", FileInfo{
			FileName: uploadPath,
			FileSize: fileInfo.Size(),
		}, &reply)
		// 输出执行的结果
		fmt.Printf("SendFileInfo result: %v\n", reply)
	}()

	return nil
}