package main

import (
	"fmt"
	"io"
	"os"
	"path/filepath"
	"regexp"
	"sparrow/pkg/rpcs"
	"sparrow/pkg/server"
	"sparrow/pkg/utils"
	"sync"
	"time"
)

const checkTimeOut = 30 * time.Minute

// FileAccess RPC服务
type FileAccess struct {
	mu        sync.RWMutex
	tempFiles map[string]*tempFile
}

// 代表一个临时文件
type tempFile struct {
	//文件路径
	fileName string
	//创建时间
	createTime time.Time
}

// NewFileAccess create a FileAccessor instance
func NewFileAccess() *FileAccess {
	return &FileAccess{
		tempFiles: make(map[string]*tempFile),
	}
}

// TODO:  临时解决文案，下个版本把文件信息写到redis中，利用redis的pub/sub机制，自动清理文件
func (f *FileAccess) checker() {
	server.Log.Info("开始文件过期检测")
	for {
		for k, v := range f.tempFiles {
			if time.Now().Sub(v.createTime) > checkTimeOut {
				//delete file
				f.mu.Lock()
				delete(f.tempFiles, k)
				f.mu.Unlock()
				err := os.Remove(v.fileName)
				if err != nil {
					server.Log.Errorf("自动清理文件失败:%v", err)
				}
			}
		}
		time.Sleep(30 * time.Minute)
	}
}

// MoveFile move a file to new path
// source:http://192.168.175.60:9000/upload/tmp/2c9d7d85-2266-450a-9d47-28e67703d818.jpeg
func (f *FileAccess) MoveFile(args *rpcs.ArgsMoveFile, reply *rpcs.ReplyMoveFile) error {
	// check source file
	reg := regexp.MustCompile(`tmp/\$*.*`)
	src := reg.FindString(args.Source)
	fileName := filepath.Base(src)
	server.Log.Debug(src)
	src = *conStaticPath + "/" + src
	b, err := utils.Exists(src)
	if err != nil {
		server.Log.Error(err)
		return err
	}
	if b {
		// copy file
		sourceFileStat, err := os.Stat(src)
		if err != nil {
			return err
		}

		if !sourceFileStat.Mode().IsRegular() {
			return fmt.Errorf("%s is not a regular file", src)
		}

		source, err := os.Open(src)
		if err != nil {
			return err
		}
		defer source.Close()

		dst := *conStaticPath + "/" + args.Target + "/" + fileName
		utils.CreateIfNotExist(dst)
		destination, err := os.Create(dst)
		if err != nil {
			return err
		}
		defer destination.Close()
		io.Copy(destination, source)
		fpath := fmt.Sprintf("http://%s/%s/%s/%s", server.GetHTTPHost(), *conStaticPath, args.Target, fileName)
		if *conDomain != "" {
			fpath = fmt.Sprintf("http://%s/%s/%s/%s", *conDomain, *conStaticPath, args.Target, fileName)
		}
		reply.FilePath = fpath
		//delete src
		os.Remove(src)
		return nil
	}
	return nil
}