package common

import (
	"bytes"
	"crypto/md5"
	"encoding/hex"
	"github.com/go-playground/validator/v10"
	"golang.org/x/text/encoding/simplifiedchinese"
	"golang.org/x/text/transform"
	"io"
	"math/rand"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
)

// @Title 随机数种子
func init() {
	// 随机数种子
	rand.Seed(time.Now().UnixNano())
}

// @Title md5加密
func MD5(str string) string {
	h := md5.New()
	h.Write([]byte(str))
	return hex.EncodeToString(h.Sum(nil))
}

// @Title 生成随机数
func RandStr(n int, str ...string) string {
	s := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
	if len(str) > 0 {
		s = str[0]
	}
	res := ""
	for i := 0; i < n; i++ {
		res += string(s[rand.Intn(len(s))])
	}
	return res
}

// @Title 处理验证错误消息
func GetVerErr(err error) string {
	er, ok := err.(validator.ValidationErrors)
	if ok {
		field := er[0].Field()
		if field == er[0].StructField() {
			field = strings.ToLower(field[0:1]) + field[1:]
		}
		switch er[0].Tag() {
		case "required":
			return field + "不能为空"
		case "min":
			if er[0].Type().String() == "string" {
				return field + "不能小于" + er[0].Param() + "位"
			}
			return field + "不能小于" + er[0].Param()
		}
		return field + "错误"
	} else {
		return "参数格式错误"
	}
}

// @Title 是否在数组中
func InArray(need interface{}, data interface{}) bool {
	if datas, ok := data.([]int); ok {
		for _, item := range datas {
			if item == need {
				return true
			}
		}
	}
	if datas, ok := data.([]uint); ok {
		for _, item := range datas {
			if item == need {
				return true
			}
		}
	}
	if datas, ok := data.([]string); ok {
		for _, item := range datas {
			if item == need {
				return true
			}
		}
	}
	return false
}

// CreateDateDir 根据当前日期来创建文件夹
func CreateDateDir(Path string) string {
	folderName := time.Now().Format("20060102")
	folderPath := filepath.Join(Path, folderName)
	if _, err := os.Stat(folderPath); os.IsNotExist(err) {
		os.MkdirAll(folderPath, 0755)
	}
	return folderName
}

// @Title 下载文件
func DownloadFormUrl(src string, filename string) error {
	res, err := http.Get(src)
	if err != nil {
		return err
	}
	defer res.Body.Close()
	// 获得get请求响应的reader对象
	body, err := io.ReadAll(res.Body)
	if err != nil {
		return err
	}
	out, err := os.Create(filename)
	if err != nil {
		return err
	}
	if _, err := io.Copy(out, bytes.NewReader(body)); err != nil {
		return err
	}
	return nil
}

// @Title utf8转gbk
func Utf8ToGbk(source string) string {
	result, _, _ := transform.String(simplifiedchinese.GBK.NewEncoder(), source)
	return result
}

// @Title gbk转utf8
func GbkToUtf8(source string) string {
	result, _, _ := transform.String(simplifiedchinese.GBK.NewDecoder(), source)
	return result
}