package utils

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/base64"
	"fmt"
	"regexp"
	"sort"
	"strconv"
	"strings"
)

// HmacSha256 计算HmacSha256
// key 是加密所使用的key
// data 是加密的内容
func HmacSha256(key string, data string) []byte {
	mac := hmac.New(sha256.New, []byte(key))
	_, _ = mac.Write([]byte(data))

	return mac.Sum(nil)
}

// 数据没有记录
func ErrNoRow() string {
	return "<QuerySeter> no row found"
}

// HmacSha256ToBase64 将加密后的二进制转Base64字符串
func HmacSha256ToBase64(key string, data string) string {
	return base64.URLEncoding.EncodeToString(HmacSha256(key, data))
}

func GetSign(nonce, timestamp, appId, secret string) (sign string) {
	signStrMap := map[string]string{
		"nonce":     nonce,
		"timestamp": timestamp,
		"appid":     appId,
	}
	keys := make([]string, 0, len(signStrMap))
	for k := range signStrMap {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	var signStr string
	for _, k := range keys {
		signStr += k + "=" + signStrMap[k] + "&"
	}
	signStr = strings.Trim(signStr, "&")
	fmt.Println("signStr:" + signStr)
	sign = HmacSha256ToBase64(secret, signStr)
	return
}

func StringsToJSON(str string) string {
	rs := []rune(str)
	jsons := ""
	for _, r := range rs {
		rint := int(r)
		if rint < 128 {
			jsons += string(r)
		} else {
			jsons += "\\u" + strconv.FormatInt(int64(rint), 16) // json
		}
	}
	return jsons
}

func StartIndex(page, pagesize int) int {
	if page > 1 {
		return (page - 1) * pagesize
	}
	return 0
}

// TrimHtml
func TrimHtml(src string) string {
	//将HTML标签全转换成小写
	re, _ := regexp.Compile("\\<[\\S\\s]+?\\>")
	src = re.ReplaceAllStringFunc(src, strings.ToLower)

	re, _ = regexp.Compile("\\<img[\\S\\s]+?\\>")
	src = re.ReplaceAllString(src, "")

	re, _ = regexp.Compile("class[\\S\\s]+?>")
	src = re.ReplaceAllString(src, "")
	re, _ = regexp.Compile("\\<[\\S\\s]+?\\>")
	src = re.ReplaceAllString(src, "")
	return strings.TrimSpace(src)
}

func Unique[T comparable](slice []T) []T {
	seen := make(map[T]struct{})
	var unique []T

	for _, v := range slice {
		if _, exists := seen[v]; !exists {
			unique = append(unique, v)
			seen[v] = struct{}{}
		}
	}
	return unique
}

func GetOrmReplaceHolder(num int) string {
	var stringBuffer strings.Builder
	for i := 0; i < num; i++ {
		stringBuffer.WriteString("?")
		if i != num-1 {
			stringBuffer.WriteString(",")
		}
	}
	return stringBuffer.String()
}