package util

import (
	"archive/zip"
	"bytes"
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"image"
	"io"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"time"
	"webserver/extend/code"

	"basic.com/pubsub/protomsg.git"
	"github.com/gin-gonic/gin"
	"github.com/golang/glog"
	"github.com/pierrec/lz4"
	"gocv.io/x/gocv"

	"crypto/rand"
	"fmt"
	"reflect"
	"strings"
)

// iterater field of struct to lowcast.
// return type: string slice.
func FiledbyStuct(stuct interface{}) []string {
	var strtmp []string
	t := reflect.TypeOf(stuct)
	for i := 0; i < t.NumField(); i++ {
		strtmp = append(strtmp, strings.ToLower(string(t.Field(i).Name)))
	}
	return strtmp
}

//
// ResponseFormat 返回数据格式化
func ResponseFormat(c *gin.Context, respStatus *code.Code, data interface{}) {
	if respStatus == nil {
		glog.Error("response status param not found!")
		respStatus = code.RequestParamError
	}
	c.JSON(respStatus.Status, gin.H{
		"code":    respStatus.Status,
		"success": respStatus.Success,
		"msg":     respStatus.Message,
		"data":    data,
	})
	return
}

func PseudoUuid() (uuid string) {
	b := make([]byte, 16)
	rand.Read(b)
	uuid = fmt.Sprintf("%X-%X-%X-%X-%X", b[0:4], b[4:6], b[6:8], b[8:10], b[10:])

	return
}

//struct转map
func Struct2Map(obj interface{}) map[string]interface{} {
	resultMap := make(map[string]interface{}, 0)
	bytesData, err := json.Marshal(obj)
	if err != nil {
		return resultMap
	}
	json.Unmarshal(bytesData, &resultMap)
	return resultMap

	//
	//t := reflect.TypeOf(obj)
	//v := reflect.ValueOf(obj)
	//
	//var data = make(map[string]interface{})
	//for i := 0; i < t.NumField(); i++ {
	//	data[t.Field(i).Name] = v.Field(i).Interface()
	//}
	//return data
}

func ReadImgData(url string) ([]byte, error) {
	resp, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	pix, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	return pix, nil
}

// 按尺寸去切图
func SubImg(i protomsg.Image, x0, y0, x1, y1 int) []byte {
	img, _ := gocv.NewMatFromBytes(int(i.Height), int(i.Width), gocv.MatTypeCV8UC3, i.Data)
	rect := image.Rect(EnlargeSize(x0, y0, x1, y1, i))
	region := img.Region(rect)
	bytes, _ := gocv.IMEncode(".jpg", region)
	return bytes
}

// 长宽变为一比一，每边各扩百分之20
func EnlargeSize(x0, y0, x1, y1 int, i protomsg.Image) (x0_new, y0_new, x1_new, y1_new int) {
	// 先把长宽变为一比一
	chazhi := (y1 - y0) - (x1 - x0)
	x0 = x0 - chazhi/2
	if x0 < 0 {
		x0 = 0
	}
	x1 = x1 + chazhi/2
	if x1 > int(i.Width) {
		x1 = int(i.Width)
	}

	// 再把每边各扩大百分之20
	enlarge := float32(0.2)
	x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
	if x0_new < 0 {
		x0_new = 0
	}
	x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
	if x1_new > int(i.Width) {
		x1_new = int(i.Width)
	}
	y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
	if y0_new < 0 {
		y0_new = 0
	}
	y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
	if y1_new > int(i.Height) {
		y1_new = int(i.Height)
	}
	return
}

func StringIpToInt(ipstring string) int {
	ipSegs := strings.Split(ipstring, ".")
	var ipInt int = 0
	var pos uint = 24
	for _, ipSeg := range ipSegs {
		tempInt, _ := strconv.Atoi(ipSeg)
		tempInt = tempInt << pos
		ipInt = ipInt | tempInt
		pos -= 8
	}
	return ipInt
}

func IpIntToString(ipInt int) string {
	ipSegs := make([]string, 4)
	var len int = len(ipSegs)
	buffer := bytes.NewBufferString("")
	for i := 0; i < len; i++ {
		tempInt := ipInt & 0xFF
		ipSegs[len-i-1] = strconv.Itoa(tempInt)

		ipInt = ipInt >> 8
	}
	for i := 0; i < len; i++ {
		buffer.WriteString(ipSegs[i])
		if i < len-1 {
			buffer.WriteString(".")
		}
	}
	return buffer.String()
}

func ParseScore(compareScore float32) float32 {
	if compareScore < 1 {
		compareScore = compareScore * 100
	}
	f, _ := strconv.ParseFloat(fmt.Sprintf("%2.2f", compareScore), 32)
	return float32(f)
}

func ParseScore64(compareScore float64) float64 {
	if compareScore < 1 {
		compareScore = compareScore * 100
	}
	f, _ := strconv.ParseFloat(fmt.Sprintf("%2.2f", compareScore), 64)
	return f
}

// UnCompress uncompress
func UnCompress(in []byte) ([]byte, error) {
	out := make([]byte, 10*len(in))
	n, err := lz4.UncompressBlock(in, out)
	if err != nil {
		fmt.Println(err)
		return nil, err
	}
	out = out[:n] // uncompressed data
	return out, nil
}

// Compress compress
func Compress(in []byte) ([]byte, error) {
	out := make([]byte, len(in))
	ht := make([]int, 64<<10) // buffer for the compression table
	n, err := lz4.CompressBlock(in, out, ht)
	if err != nil {
		fmt.Println(err)
		return nil, err
	}
	if n >= len(in) {
		fmt.Println("image is not compressible")
	}
	out = out[:n] // compressed data
	return out, nil
}

// 判断所给路径文件/文件夹是否存在
func Exists(path string) bool {
	if path == "" {
		return false
	}
	_, err := os.Stat(path)    //os.Stat获取文件信息
	if err != nil {
		if os.IsExist(err) {
			return true
		}
		return false
	}
	return true
}
func CreateDirectory(path string) bool {
	if path == "" {
		return false
	}
	if Exists(path) {
		return true
	}
	err := os.MkdirAll(path,os.ModePerm)
	if err !=nil {
		return false
	}
	return true
}

//日期转字符串
func FormatDate(date time.Time, layout string) string {
	layout = strings.Replace(layout, "yyyy", "2006", 1)
	layout = strings.Replace(layout, "yy", "06", 1)
	layout = strings.Replace(layout, "MM", "01", 1)
	layout = strings.Replace(layout, "dd", "02", 1)
	layout = strings.Replace(layout, "HH", "15", 1)
	layout = strings.Replace(layout, "mm", "04", 1)
	layout = strings.Replace(layout, "ss", "05", 1)
	layout = strings.Replace(layout, "SSS", "000", -1)
	return date.Format(layout)
}
func ZipCheck(zipPath string) bool {
	f, err := os.Open(zipPath)
	if err != nil {
		return false
	}
	defer f.Close()
	buf := make([]byte, 4)
	if n, err := f.Read(buf); err != nil || n < 4 {
		return false
	}
	return bytes.Equal(buf, []byte("PK\x03\x04"))
}
func UnZip(archive, target string) error {
	reader, err := zip.OpenReader(archive)
	if err != nil {
		return err
	}
	if err := os.MkdirAll(target, 0755); err != nil {
		return err
	}
	for _, file := range reader.File {
		path := filepath.Join(target, file.Name)
		if file.FileInfo().IsDir() {
			os.MkdirAll(path, file.Mode())
			continue
		}
		fileReader, err := file.Open()
		if err != nil {
			return err
		}
		defer fileReader.Close()
		targetFile, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
		if err != nil {
			return err
		}
		defer targetFile.Close()
		if _, err := io.Copy(targetFile, fileReader); err != nil {
			return err
		}
	}

	return nil
}

func FormatNum(oNum int,n int) string {
	m := 0
	for {
		oNum = oNum / 10
		m++
		if oNum == 0 {
			break
		}
	}
	fmtStr := "%0"+strconv.Itoa(m)+"d"
	return fmt.Sprintf(fmtStr, n)
}

func FileMd5(path string) (string,error){
	file, err := os.Open(path)
	if err !=nil {
		return "",err
	}

	defer file.Close()

	_md5 := md5.New()
	if _,err := io.Copy(_md5, file);err != nil {
		return "",err
	}

	return hex.EncodeToString(_md5.Sum(nil)),nil
}