package handle

import (
	"encoding/json"
	"fmt"
	"fts/config"
	"github.com/gorilla/websocket"
	_ "github.com/ipfs/go-ipfs-api"
	shell "github.com/ipfs/go-ipfs-api"
	"io"
	"log"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"strconv"
	"strings"
	"time"
)

var gobalLoginUserId string

//key:filepath,value:hash
var gobalFileMap = make(map[string] string)
var gobalFileUpdateTimeMap = make(map[string] string)

//var gobalFileChangeMap = make(map[string] string)
var getLocalFileListDir string
var gobalSubscriptionFileChangeSwitch int =0 //订阅文件变更开关



var  ipfsPath=os.Getenv("IPFS-PATH")

/**
文件上传下载进度
*/
type processStruct struct {
	Size string `json:"size"`
	CurrentSize string `json:"currentSize"`
	Unit string `json:"unit"`
	CurrentUnit string `json:"currentUnit"`
	Process float64 `json:"process"`
	Hash string `json:"hash"`
}

func main() {


	//config.InitConfig()
	//InitLocalWorkSpace("320872793405132801","test1")
	//
	//DownCommand("QmTp2hEo8eXRp6wg7jXv1BLCMh5a4F3B7buAUZNZUu772j","testOne","hello.txt","a/b/")
	//
	//UploadCommand("C:\\Users\\yuan_rh\\Downloads\\QmRzN7uW6HCVAkGMXNWv3rC9dqPJijvEgvtW6DKsQQE8Js","QmRzN7uW6HCVAkGMXNWv3rC9dqPJijvEgvtW6DKsQQE8Js","testOne","a/b/")
	//
	//GetLocalFileList("testOne")
}



/**
初始化本地工作目录
@param userId 用户ID
@param projectName 项目名称
*/
func InitLocalWorkSpace(conn *websocket.Conn,userId,projectName string) (error){

	//空格路径处理
	ipfsPath=strings.Replace(os.Getenv("IPFS-PATH"),"\"","",1)+"\\ipfs.exe"

	//初始化当前登陆用户
	gobalLoginUserId = userId

	// 检查本地目录是否存在
	var projectPath = config.LocalWorkSpaceDir +"\\"+userId+"\\"+projectName
	_,err := os.Stat(projectPath)
	if err != nil {
		//创建文件目录
		os.MkdirAll(projectPath, os.ModePerm)
		/*os.MkdirAll(projectPath+"\\我的文件", os.ModePerm)
		os.MkdirAll(projectPath+"\\工作文件", os.ModePerm)
		os.MkdirAll(projectPath+"\\协作文件", os.ModePerm)
		os.MkdirAll(projectPath+"\\公共文件", os.ModePerm)*/
	}

	log.Println("切换本地工作目录至 "+projectPath)

	if err := conn.WriteMessage(websocket.TextMessage, []byte(fmt.Sprint(projectPath))); err != nil {
		log.Println(err)
		return err
	}

	return nil
}

/**
下载指令
@param hash ipfs哈希值
@param projectName 项目名称
@para fileName 文件名称
@param dir 云文件目录
*/
func DownCommand(conn *websocket.Conn, hash, projectName, fileName, dir string) error{

	absoluteDir := config.LocalWorkSpaceDir+"\\"+gobalLoginUserId+"\\"+projectName+"\\"+dir
	//检查目录
	_,err := os.Stat(absoluteDir)
	if err != nil {
		//创建文件目录
		err = os.MkdirAll(absoluteDir, os.ModePerm)
		if err!=nil{
			log.Println(err)
			return err
		}
	}


	var downloading bool = false

	//检测文件打开状态
	tfile,err := os.OpenFile(fmt.Sprint(absoluteDir+"\\"+fileName),os.O_RDWR,1)

	if err != nil && (!os.IsNotExist(err)) {

		log.Println("文件被占用，请关闭打开的软件")
		if err := conn.WriteMessage(websocket.TextMessage, []byte("-2")); err != nil {
			return err
		}
		return err
	}
	defer tfile.Close()

	//serverSh := shell.NewShell(config.ServerIpfsUrl)
	////检测引导节点是否连接成功
	//isUp := serverSh.IsUp()
	//if !isUp {
	//	if err := conn.WriteMessage(websocket.TextMessage, []byte("-1")); err != nil {
	//		return err
	//	}
	//	return nil
	//}

	cmd := exec.Command(ipfsPath,"get", hash,"-o",fmt.Sprint(absoluteDir+"\\"+fileName))
	progress := make(chan string,10000)
	var stdout, stderr []byte
	var errStdout, errStderr error
	stdoutIn, _ := cmd.StdoutPipe()
	stderrIn, _ := cmd.StderrPipe()
	cmd.Start()
	go func() {
		stdout, errStdout = copyAndCapture(os.Stdout, stdoutIn, progress)
	}()
	go func() {
		stderr, errStderr = copyAndCapture(os.Stderr, stderrIn, progress)
	}()

	go func(){
		millSeconds := time.Now().UnixNano() / 1e6
		for content := range progress { // 通道关闭后会退出for range循环
			current :=time.Now().UnixNano() / 1e6

			if current-millSeconds>500{
				projson,err := contentToJSONByte(content)
				if projson==nil && err==nil{
					continue
				}

				if err != nil {
					log.Printf("json.Marshal error %s\n", err)
				}
				millSeconds = current
				downloading = true

				if err := conn.WriteMessage(websocket.TextMessage, projson); err != nil {
					log.Println(err)
					break
				}

			}
			if strings.Index(content,"100.00%")!=-1{

				projson,err := contentToJSONByte(content)
				if projson==nil && err==nil{
					continue
				}

				if err != nil {
					log.Printf("json.Marshal error %s\n", err)
				}
				downloading = true
				if err := conn.WriteMessage(websocket.TextMessage, projson); err != nil {
					panic(err)
				}
				break

			}
		}
	}()
	log.Println("下载资源连接中...")

	//设置30秒连接超时
	go func() {
		index :=0
		for true{
			index++
			if downloading==true{
				return
			}
			time.Sleep(time.Duration(1)*time.Second)
			if downloading==false && index==30{
				err = cmd.Process.Kill()
				log.Println("进程连接超时30s已被Kill")
				if err := conn.WriteMessage(websocket.TextMessage, []byte("-1")); err != nil {
					return
				}
				return
			}
		}
	}()

	err = cmd.Wait()
	if err != nil {
		log.Printf("cmd.Run() failed with %s\n", err)
	}
	if errStdout != nil || errStderr != nil {
		log.Printf("failed to capture stdout or stderr\n")
	}
	outStr, errStr := string(stdout), string(stderr)
	log.Printf("out:%s ,err:%s", outStr, errStr)

	if err==nil{
		log.Println("下载成功")
	}

	//time.Sleep(time.Duration(6)*time.Second)

	defer close(progress)

	return nil
}

func contentToJSONByte(content string) ([]byte,error){
	sts :=strings.Split(content," ")
	if len(sts)<8{
		log.Println("字符长度小于8")
		return nil,nil
	}
	var processFloat float64
	if (len(sts)==9 || len(sts)==8){
		processFloat,_ =strconv.ParseFloat(strings.Replace(sts[7],"%","",1), 64)
	}else{
		processFloat,_ =strconv.ParseFloat(strings.Replace(sts[8],"%","",1), 64)
	}

	if processFloat==0{
		//log.Println("当前进度0")
		return nil,nil
	}

	pro :=&processStruct{
		Size:sts[4],
		CurrentSize: sts[1],
		Unit: sts[2],
		CurrentUnit: sts[5],
		Process: processFloat,
		Hash: "",

	}
	projson,err :=json.Marshal(pro)

	return projson,err
}


/**
上传本地文件
@param absolutePath 文件本地绝对路径
@param fileName 文件名称
@param projectName 项目名称
@param dir 云文件目录
*/
func UploadCommand(conn *websocket.Conn,absolutePath,fileName,projectName,dir string) error{

	//本地拷贝文件
	absoluteDir := config.LocalWorkSpaceDir+"\\"+gobalLoginUserId+"\\"+projectName+"\\"+dir
	//检查目录
	_,err := os.Stat(absoluteDir)
	if err != nil {
		//创建文件目录
		err = os.MkdirAll(absoluteDir, os.ModePerm)
		if err!=nil{
			return err
		}
	}

	//检测文件打开状态
	tfile,err := os.OpenFile(absolutePath,os.O_RDWR,1)
	if err != nil {
		log.Println("文件被占用，请关闭打开的软件")
		if err := conn.WriteMessage(websocket.TextMessage, []byte("-2")); err != nil {
			return err
		}
		return err
	}
	defer tfile.Close()

	serverSh := shell.NewShell(config.ServerIpfsUrl)
	//检测引导节点是否连接成功
	isUp := serverSh.IsUp()
	if !isUp {
		if err := conn.WriteMessage(websocket.TextMessage, []byte("-1")); err != nil {
			return err
		}
		return nil
	}


	var uploading bool=false

	cmd := exec.Command(ipfsPath, "add",absolutePath)
	uploadProgress := make(chan string,10000)
	var stdout, stderr []byte
	var errStdout, errStderr error
	stdoutIn, _ := cmd.StdoutPipe()
	stderrIn, _ := cmd.StderrPipe()
	cmd.Start()
	go func() {
		stdout, errStdout = copyAndCapture(os.Stdout, stdoutIn, uploadProgress)
	}()
	go func() {
		stderr, errStderr = copyAndCapture(os.Stderr, stderrIn, uploadProgress)
	}()

	go func(){
		millSeconds := time.Now().UnixNano() / 1e6
		for content := range uploadProgress { // 通道关闭后会退出for range循环
			current :=time.Now().UnixNano() / 1e6
			if current-millSeconds>500{
				projson,err := contentToJSONByte(content)
				if projson==nil && err==nil{
					continue
				}

				if err != nil {
					log.Println("json.Marshal error %s\n", err)
				}
				uploading=true
				if err := conn.WriteMessage(websocket.TextMessage, projson); err != nil {
					break
				}
				millSeconds = current
			}
			if strings.Index(content,"100.00%")!=-1{

				projson,err := contentToJSONByte(content)
				if projson==nil && err==nil{
					continue
				}


				if err != nil {
					log.Println("json.Marshal error %s\n", err)
				}
				uploading=true
				if err := conn.WriteMessage(websocket.TextMessage, projson); err != nil {
					panic(err)
				}
				break
			}
		}
	}()

	log.Println("文件上传中...")

	//设置30秒连接超时
	go func() {
		index :=0
		for true{
			index++
			if uploading==true{
				return
			}
			time.Sleep(time.Duration(1)*time.Second)
			if uploading==false && index==30{
				err = cmd.Process.Kill()
				log.Println("进程连接超时30s已被Kill")
				if err := conn.WriteMessage(websocket.TextMessage, []byte("-1")); err != nil {
					return
				}
				return
			}
		}
	}()

	err = cmd.Wait()

	if err != nil {
		log.Println("cmd.Run() failed with %s\n", err)
	}
	if errStdout != nil || errStderr != nil {
		log.Println("failed to capture stdout or stderr\n")
	}
	outStr, errStr := string(stdout), string(stderr)
	log.Printf("out:%s,err:%s", outStr, errStr)
	/*sh.Get(hash,absoluteDir+fileName)
	if err != nil {
		return "",err
	}*/
	defer close(uploadProgress)

	prog := new(processStruct)
	prog.Hash=strings.Split(outStr," ")[1]
	prog.Process=100.00

	sh := shell.NewShell(config.GobalIpfsUrl)
	objectStat,err :=sh.ObjectStat(prog.Hash)
	if err != nil {
		log.Println(err)
		return err
	}
	prog.Size=strconv.Itoa(objectStat.CumulativeSize)

	projson,err :=json.Marshal(prog)

	err = serverSh.Pin(prog.Hash)
	if err != nil {
		log.Println("引导节点备份失败")
		log.Println(err)
		if err := conn.WriteMessage(websocket.TextMessage, []byte("-1")); err != nil {
			return err
		}
		return err
	}

	if err := conn.WriteMessage(websocket.TextMessage, projson); err != nil {
		log.Println(err)
	}

	log.Println("引导节点文件备份成功")


	//本地文件夹拷贝
	err = sh.Get(prog.Hash,fmt.Sprint((absoluteDir+"\\"+fileName)))

	if err != nil {
		log.Println(err)
		return err
	}

	log.Println("上传成功")

	return nil
}

func copyAndCapture(w io.Writer, r io.Reader, progress chan string) ([]byte, error) {
	var out []byte
	buf := make([]byte, 1024, 1024)
	for {
		n, err := r.Read(buf[:])
		if n > 0 {
			d := buf[:n]
			out = append(out, d...)
			progress <- string(d)

		}
		if err != nil {
			// Read returns io.EOF at the end of file, which is not an error for us
			if err == io.EOF {
				err = nil
			}
			return out, err
		}
	}
	// never reached
	panic(true)
	return nil, nil
}

/**
单个文件信息
 */
type simpleFileInfo struct {
	Name string `json:"name" `
	Extension string `json:"extension"`
	RelativePath string `json:"relativePath"`
	AbsolutePath string `json:"absolutePath"`
}

var gobalFolderFileMap = make(map[string] *simpleFileInfo)
var gobalRelativePath string
/**
获取指定目录或文件的文件信息，如果是目录递归获取文件信息
@param id 文件id
*/
func GetFolderFileInfo(conn *websocket.Conn,absolutePath string) error{

	fileInfo,err :=os.Stat(absolutePath)
	if err!=nil{
		log.Println(err)
		return err
	}

	log.Println(filepath.Dir(absolutePath))
	//单个文件处理

	if !fileInfo.IsDir() {
		simpleFileInfo := new(simpleFileInfo)
		simpleFileInfo.Name=fileInfo.Name()
		simpleFileInfo.Extension=path.Ext(absolutePath)
		simpleFileInfo.RelativePath=""
		simpleFileInfo.AbsolutePath=absolutePath
		gobalFolderFileMap[absolutePath]=simpleFileInfo
		bytes,err :=json.Marshal(gobalFolderFileMap)
		if err != nil {
			log.Println(err)
			return err
		}
		if err := conn.WriteMessage(websocket.TextMessage, bytes); err != nil {
			log.Println(err)
			return err
		}
		return nil
	}

	//文件目录处理
	gobalRelativePath = filepath.Dir(absolutePath)+"\\"
	err =filepath.Walk(absolutePath, myWalkfunc)

	if err != nil {
		log.Println(err)
		return err
	}

	bytes,err :=json.Marshal(gobalFolderFileMap)
	if err != nil {
		log.Println(err)
		return err
	}
	if err := conn.WriteMessage(websocket.TextMessage, bytes); err != nil {
		log.Println(err)
		return err
	}

	return nil
}

func myWalkfunc(path string, info os.FileInfo, err error) error {

	if info.IsDir()==false{
		simpleFileInfo := new(simpleFileInfo)
		simpleFileInfo.Name=info.Name()
		simpleFileInfo.Extension=filepath.Ext(path)
		simpleFileInfo.RelativePath=strings.Replace(path,gobalRelativePath,"",1)
		simpleFileInfo.AbsolutePath=path
		gobalFolderFileMap[path]=simpleFileInfo
		return nil
	}

	return nil
}

/**
获取本地文件列表
*/
func SubscriptionFileChange(conn *websocket.Conn, projectName string) error{

	getLocalFileListDir = fmt.Sprint(config.LocalWorkSpaceDir+"\\"+gobalLoginUserId+"\\"+projectName+"\\")

	for  {
		err :=filepath.Walk(getLocalFileListDir,walkfunc)
		if err != nil {
			log.Println(err)
			time.Sleep(time.Duration(1)*time.Minute)
			continue
		}

		mapByte,err:=json.Marshal(gobalFileMap)
		if err != nil {
			log.Println(err)
			return err
		}

		if err := conn.WriteMessage(websocket.TextMessage, mapByte); err != nil {
			log.Println(err)
			return err
		}

		log.Println("检查本地目录文件变更状态，执行睡眠时间1分钟")

		//清空gobalFileMap
		gobalFileMap = make(map[string] string)

		time.Sleep(time.Duration(1)*time.Minute)
	}

	return nil
}

func walkfunc(path string, info os.FileInfo, err error) error {

	if info.IsDir()==false{

		sh := shell.NewShell(config.GobalIpfsUrl)
		file,err :=os.Open(path)

		if err != nil{
			log.Println(err)
			return err
		}

		defer file.Close()

		hash,err :=sh.Add(file)
		if err != nil {
			log.Println(err)
			return err
		}

		dir :=strings.Replace(fmt.Sprint(path),fmt.Sprint(getLocalFileListDir),"",1)

		gobalFileMap[dir]=hash

	}
	return nil
}