package stringer

import (
	"fmt"
	"strings"
	"unicode"
)

func Build(ss ...string) (string, error) {
	var builder strings.Builder

	for _, s := range ss {
		if _, err := builder.WriteString(s); err != nil {
			return "", err
		}
	}

	return builder.String(), nil
}

func ToCamel(str string) string {
	if len(str) < 1 {
		return str
	}

	for i, c := range str[1:] {
		if c >= 'A' && c <= 'Z' {
			str = fmt.Sprintf("%s_%c%s", str[:i+1], unicode.ToLower(c), str[i+2:])
			return ToCamel(str)
		}
	}

	return str
}

func ToSnake(str string) string {
	if len(str) < 1 {
		return str
	}

	for i, c := range str[1:] {
		if c == '_' {
			str = fmt.Sprintf("%s%c%s", str[:i+1], unicode.ToUpper(rune(str[i+2])), str[i+3:])
			return ToSnake(str)
		}
	}

	return str
}