package jsonc

import (
	"regexp"
	"strings"
	"unicode"
)

func Lcfirst(str string) string {
	for i, v := range str {
		return string(unicode.ToLower(v)) + str[i+1:]
	}
	return ""
}

func Case2Camel(name string) string {
	name = strings.Replace(name, "_", " ", -1)
	name = strings.Title(name)
	return strings.Replace(name, " ", "", -1)
}

func ConvertJSON2Camel(jsonStr []byte) []byte {
	var keyMatchRegex = regexp.MustCompile(`\"(\w+)\":`)
	converted := keyMatchRegex.ReplaceAllFunc(
		jsonStr,
		func(match []byte) []byte {
			matchStr := string(match)
			key := matchStr[1 : len(matchStr)-2]
			resKey := Lcfirst(Case2Camel(key))
			return []byte(`"` + resKey + `":`)
		},
	)
	return converted
}