package q5

import (
	"io"
	"strings"
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"hash/crc32"
)

const (
	JSON_NONE = 0
	JSON_ARRAY = iota
	JSON_OBJECT = iota
)

func Md5Str(data string) string {
	h := md5.New()
	h.Write([]byte(data))
	return hex.EncodeToString(h.Sum(nil))
}

func Crc32(data string) uint32 {
	ieee := crc32.NewIEEE()
	io.WriteString(ieee, data)

	code := ieee.Sum32()
	return code
}

func JsonStrType(data string) int32 {
	arrayIdx := strings.IndexByte(data, '[')
	objectIdx := strings.IndexByte(data, '{')
	if arrayIdx < 0 && objectIdx < 0 {
		return JSON_NONE
	} else {
		if arrayIdx < 0 {
			return JSON_OBJECT
		}
		if objectIdx < 0 {
			return JSON_ARRAY
		}
		if arrayIdx < objectIdx {
			return JSON_ARRAY
		} else {
			return JSON_OBJECT
		}
	}
}

func EncodeJson(p interface{}) string {
	if jsonBytes, err := json.Marshal(p); err == nil {
		return string(jsonBytes)
	} else {
		return ""
	}
}

func StrSplit(s string, sep string) []string {
	return strings.Split(s, sep)
}

func StrContains(s string, substr string) bool {
	return strings.Contains(s, substr)
}