package grlogs

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"io/ioutil"
	"math/rand"
	"os"
	"path"
	"reflect"
	"runtime"
	"strings"
	"time"
)

//传入一个字符串，返回一个加密后的md5
func Md5(str string) string {
	data := []byte(str)
	has := md5.Sum(data)
	md5str := fmt.Sprintf("%x", has) //将[]byte转成16进制
	return md5str
}

func Md5File(filePath string) string {
	hash := md5.New()
	data, _ := ioutil.ReadFile(filePath)
	hash.Write([]byte(data))
	md5str := hex.EncodeToString(hash.Sum(nil))
	return md5str
}

func GetPackageName() string {
	packpath := reflect.TypeOf(Empty{}).PkgPath()
	if idx := strings.Index(packpath, "/"); idx > 0 {
		return packpath[:idx]
	} else {
		return packpath
	}
}

func GetCwd(filepath ...string) string {
	_, filename1, _, _ := runtime.Caller(0)
	filename2, _ := os.Getwd()
	if !strings.HasSuffix(filename2, GetPackageName()) {
		paths := append([]string{path.Dir(filename1), "/../../"}, filepath...)
		return path.Join(paths...)
	} else {
		paths := append([]string{filename2, "/"}, filepath...)
		return path.Join(paths...)
	}
}

func SetCwd() error {
	_, filename1, _, _ := runtime.Caller(0)
	filename2, _ := os.Getwd()
	if !strings.HasSuffix(filename2, GetPackageName()) {
		paths := append([]string{path.Dir(filename1), "/../../"})
		return os.Chdir(path.Join(paths...))
	} else {
		paths := append([]string{filename2, "/"})
		return os.Chdir(path.Join(paths...))
	}
}

func RandString(length int) string {
	str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	bytes := []byte(str)
	result := []byte{}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < length; i++ {
		result = append(result, bytes[r.Intn(len(bytes))])
	}
	return string(result)
}