package util

import (
	"basic.com/pubsub/protomsg.git"
	"encoding/json"
	"github.com/gin-gonic/gin"
	"github.com/golang/glog"
	"gocv.io/x/gocv"
	"image"
	"webserver/extend/code"

	"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
}

// 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
}