package core

import (
	cryptorand "crypto/rand"
	"github.com/rs/zerolog/log"
	"runtime"
	"strconv"
	"strings"
)

const digits = "0123456789abcdefghijklmnopqrstuvwxyz"
const maxSize = byte(len(digits))

func RandString(size byte) string {
	b := make([]byte, size)
	if _, err := cryptorand.Read(b); err != nil {
		panic(err)
	}
	for i := byte(0); i < size; i++ {
		b[i] = digits[b[i]%maxSize]
	}
	return string(b)
}

func Between(s, sub1, sub2 string) string {
	i := strings.Index(s, sub1)
	if i < 0 {
		return ""
	}
	s = s[i+len(sub1):]

	if len(sub2) == 1 {
		i = strings.IndexByte(s, sub2[0])
	} else {
		i = strings.Index(s, sub2)
	}
	if i >= 0 {
		return s[:i]
	}

	return s
}

func Assert(ok bool) {
	if !ok {
		_, file, line, _ := runtime.Caller(1)
		panic(file + ":" + strconv.Itoa(line))
	}
}

func Caller() string {
	log.Error().Caller(0).Send()
	_, file, line, _ := runtime.Caller(1)
	return file + ":" + strconv.Itoa(line)
}