package utils

import (
	"encoding/json"
	"fmt"
	"github.com/lionsoul2014/ip2region/binding/golang/xdb"
	"golang.org/x/crypto/sha3"
	"math/rand"
	"reflect"
	"strings"
	"time"
)

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

func RandomNumber(bit int) int {
	rand.Seed(time.Now().UnixNano())
	min := 1 // min value
	max := 1 //max value
	for i := 0; i < bit; i++ {
		min = min * 10
		max = max * 10
	}
	max = max * 10
	return rand.Intn(max-min+1) + min
}

func ContainsStr(slice []string, item string) bool {
	for _, e := range slice {
		if e == item {
			return true
		}
	}
	return false
}

// Stamp2str 时间戳转字符串
func Stamp2str(timestamp int64) string {
	if timestamp == 0 {
		return ""
	}
	return time.Unix(timestamp, 0).Format("2006-01-02 15:04:05")
}

// Str2stamp 字符串转时间戳
func Str2stamp(str string) int64 {
	layout := "2006-01-02 15:04:05"
	t, err := time.Parse(layout, str)
	if err != nil {
		return 0
	}
	return t.Unix()
}

func GenPassword(pass string, salt string) string {
	data := []byte(pass + salt)
	hash := sha3.Sum256(data)
	return fmt.Sprintf("%x", hash)
}

func JsonEncode(value interface{}) string {
	bytes, err := json.Marshal(value)
	if err != nil {
		return ""
	}
	return string(bytes)
}

func JsonDecode(src string, dest interface{}) error {
	return json.Unmarshal([]byte(src), dest)
}

// CopyObject 拷贝对象
func CopyObject(src interface{}, dst interface{}) error {

	srcType := reflect.TypeOf(src)
	srcValue := reflect.ValueOf(src)
	dstValue := reflect.ValueOf(dst).Elem()
	reflect.TypeOf(dst)
	for i := 0; i < srcType.NumField(); i++ {
		field := srcType.Field(i)
		value := dstValue.FieldByName(field.Name)
		if !value.IsValid() {
			continue
		}
		// 数据类型相同，直接赋值
		v := srcValue.FieldByName(field.Name)
		if value.Type() == field.Type {
			value.Set(v)
		} else {
			// src data type is  string，dst data type is slice, map, struct
			// use json decode the data
			if field.Type.Kind() == reflect.String && (value.Type().Kind() == reflect.Struct ||
				value.Type().Kind() == reflect.Map ||
				value.Type().Kind() == reflect.Slice) {
				pType := reflect.New(value.Type())
				v2 := pType.Interface()
				err := json.Unmarshal([]byte(v.String()), &v2)
				if err == nil {
					value.Set(reflect.ValueOf(v2).Elem())
				}
				// string to map, struct, slice
			} else if (field.Type.Kind() == reflect.Struct ||
				field.Type.Kind() == reflect.Map ||
				field.Type.Kind() == reflect.Slice) && value.Type().Kind() == reflect.String {
				ba, err := json.Marshal(v.Interface())
				if err == nil {
					value.Set(reflect.ValueOf(string(ba)))
				}
			} else { // 简单数据类型的强制类型转换
				switch value.Kind() {
				case reflect.Int:
				case reflect.Int8:
				case reflect.Int16:
				case reflect.Int32:
				case reflect.Int64:
					value.SetInt(v.Int())
					break
				case reflect.Float32:
				case reflect.Float64:
					value.SetFloat(v.Float())
					break
				case reflect.Bool:
					value.SetBool(v.Bool())
					break
				}
			}

		}
	}

	return nil
}

func Ip2Region(searcher *xdb.Searcher, ip string) string {
	str, err := searcher.SearchByStr(ip)
	if err != nil {
		return ""
	}
	arr := strings.Split(str, "|")
	if len(arr) < 3 {
		return arr[0]
	}
	return fmt.Sprintf("%s-%s-%s", arr[0], arr[2], arr[3])
}