package azure

import (
	"crypto/md5"
	"encoding/hex"
	"errors"
	"flag"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"syscall"
	"time"

	"repositories.action2quare.com/ayo/gocommon/logger"

	"go.mongodb.org/mongo-driver/bson"
)

func SortVersions(versions []string) []string {
	sort.Slice(versions, func(i, j int) bool {
		leftnum := 0
		for _, iv := range strings.Split(versions[i], ".") {
			n, _ := strconv.Atoi(iv)
			leftnum += leftnum<<8 + n
		}

		rightnum := 0
		for _, iv := range strings.Split(versions[j], ".") {
			n, _ := strconv.Atoi(iv)
			rightnum += rightnum<<8 + n
		}

		return leftnum < rightnum
	})
	return versions
}

const (
	HoustonStatPoolCount = int(10)
)

type HoustonStatReport struct {
	Region          string  `json:"region"`
	FreeMemory      float64 `json:"freeMemory"`
	FreePercent     float64 `json:"freePercent"`
	CPUUsage        float64 `json:"cpuUsage"`
	PlayingUsers    int     `json:"users"`
	PlayingSessions int     `json:"sessions"`
}

var prefetchptr = flag.Bool("prefetch", false, "")

func NeedPrefetch() bool {
	return *prefetchptr
}

var ErrUpdateUnnecessary = errors.New("binary is already latest")

func SelfUpdateUsingScript(replycache *MessageReplyCache, graph *Graph, patchroot string, force bool) (err error) {
	// 1. 다운로드
	var linkfilearg string
	if replycache != nil {
		if replycache.ReplyWrap == nil {
			hostname, _ := os.Hostname()
			replycache.ReplyWrap = replycache.SourceActivity().MakeWrap().WithPrefix(hostname)
		}
		linkfile := replycache.Serialize()
		linkfilearg = fmt.Sprintf("-updatelink=%s", linkfile)
	}

	currentexe, _ := os.Executable()
	currentexe = strings.ReplaceAll(currentexe, "\\", "/")
	exefile := path.Base(currentexe)
	if runtime.GOOS == "windows" && !strings.HasSuffix(exefile, ".exe") {
		exefile += ".exe"
	}

	newbinary := fmt.Sprintf("%s.%s", exefile, time.Now().Format("2006.01.02-15.04.05"))
	downloadurl := path.Join(patchroot, exefile)

	err = graph.DownloadFile(downloadurl, newbinary)
	if err != nil {
		return
	}

	_, err = os.Stat(newbinary)
	if os.IsNotExist(err) {
		err = errors.New("다운로드 실패 : " + newbinary)
		return
	}

	if !force {
		currentfile, e := os.Open(currentexe)
		if e != nil {
			return e
		}
		defer currentfile.Close()

		hash1 := md5.New()
		_, err = io.Copy(hash1, currentfile)
		if err != nil {
			return
		}
		currentHash := hex.EncodeToString(hash1.Sum(nil))

		nextfile, e := os.Open(newbinary)
		if e != nil {
			return e
		}
		defer nextfile.Close()
		hash2 := md5.New()
		_, err = io.Copy(hash2, nextfile)
		if err != nil {
			return
		}
		nextHash := hex.EncodeToString(hash2.Sum(nil))

		if currentHash == nextHash {
			// 해시가 같으니까 업데이트 할 필요가 없다.
			return ErrUpdateUnnecessary
		}
	}

	var scriptfileName string
	if runtime.GOOS == "linux" {
		scriptfileName = "selfupdate.sh"
	} else if runtime.GOOS == "windows" {
		scriptfileName = "selfupdate.bat"
	}

	scripturl := path.Join(patchroot, scriptfileName)
	if _, err = os.Stat(scriptfileName); os.IsExist(err) {
		err = os.Remove(scriptfileName)
	} else {
		err = nil
	}

	if err != nil {
		return
	}

	// 2. 스크립트 다운로드
	err = graph.DownloadFile(scripturl, scriptfileName)
	if err != nil {
		return
	}

	var nextArgs []string
	for _, arg := range os.Args[1:] {
		// -updatelink : selfupdate시에
		if !strings.HasPrefix(arg, "-updatelink=") && arg != "-prefetch" {
			nextArgs = append(nextArgs, arg)
		}
	}
	pid := strconv.Itoa(os.Getpid())
	args := append([]string{
		pid,
		newbinary,
		exefile,
	}, nextArgs...)

	if len(linkfilearg) > 0 {
		args = append(args, linkfilearg)
	}

	// 3. 독립 실행
	if runtime.GOOS == "linux" {
		// 실행 가능한 권한 부여
		err = os.Chmod(scriptfileName, 0777)
		if err != nil {
			return
		}
		// 실행
		env := os.Environ()
		currentpath := path.Dir(currentexe)
		argv0 := path.Join(currentpath, scriptfileName)
		args = append([]string{"/bin/bash", argv0}, args...)
		err = syscall.Exec(args[0], args, env)
		if err != nil {
			return
		}
	} else if runtime.GOOS == "windows" {
		windowsargs := append([]string{
			"/C",
			"start",
			scriptfileName,
		}, args...)

		cmd := exec.Command("cmd.exe", windowsargs...)
		err = cmd.Run()
		if err != nil {
			return
		}
	}

	return
}

var linkupdate = flag.String("updatelink", "", "")

func ReplyUpdateComplete() {
	defer func() {
		r := recover()
		if r != nil {
			logger.Error(r)
		}
	}()

	if len(*linkupdate) > 0 {
		cache := DeserializeMessageReplyCache(*linkupdate)
		if cache != nil {
			os.Remove(*linkupdate)
			if cache.ReplyWrap != nil {
				cache.ReplyWrap.Update(cache.Replyaid, "업데이트 완료")
			}
		}
	}
}

// var objectIDCounter = readRandomUint32()
// var processUnique = processUniqueBytes()

// func processUniqueBytes() [5]byte {
// 	var b [5]byte
// 	_, err := io.ReadFull(rand.Reader, b[:])
// 	if err != nil {
// 		panic(fmt.Errorf("cannot initialize objectid package with crypto.rand.Reader: %v", err))
// 	}

// 	return b
// }

// func readRandomUint32() uint32 {
// 	var b [4]byte
// 	_, err := io.ReadFull(rand.Reader, b[:])
// 	if err != nil {
// 		panic(fmt.Errorf("cannot initialize objectid package with crypto.rand.Reader: %v", err))
// 	}

// 	return (uint32(b[0]) << 0) | (uint32(b[1]) << 8) | (uint32(b[2]) << 16) | (uint32(b[3]) << 24)
// }

type BsonMarshaler[T any] struct {
	val T
}

func NewBsonMarshaler[T any](val T) *BsonMarshaler[T] {
	return &BsonMarshaler[T]{
		val: val,
	}
}

func (m *BsonMarshaler[T]) MarshalBinary() (data []byte, err error) {
	return bson.Marshal(m.val)
}