package util

import (
	"crypto/md5"
	"encoding/hex"
	"time"
	"unsafe"
)

// BytesToString converts byte slice to string without a memory allocation.
func BytesToString(b []byte) string {
	return *(*string)(unsafe.Pointer(&b))
}

// StringToBytes converts string to byte slice without a memory allocation.
func StringToBytes(s string) []byte {
	return *(*[]byte)(unsafe.Pointer(
		&struct {
			string
			Cap int
		}{s, len(s)},
	))
}

func TimePtr(t time.Time) *time.Time {
	return &t
}

func BoolPtr(b bool) *bool {
	return &b
}

func Int32Ptr(i int32) *int32 {
	return &i
}

func Int64Ptr(i int64) *int64 {
	return &i
}

func StringPtr(s string) *string {
	return &s
}

func Md5Hex(str string) string {
	hash := md5.Sum([]byte(str))
	return hex.EncodeToString(hash[:])
}

func MapKeyToArray[K comparable, V any](m map[K]V) []K {
	values := make([]K, 0, len(m))

	for k := range m {
		values = append(values, k)
	}
	return values
}