package helpers

import (
    "errors"
    "net"
    "os"
    "path/filepath"
    "regexp"
	"strconv"

    "ripple/config"
)

var errInvalidAddress = errors.New("invalid address")

var UsernameRegex = regexp.MustCompile(`^[A-Za-z0-9_]{1,32}$`)

func GetFilePath(filename string) (string, error) {
    homeDir, err := os.UserHomeDir()
    if err != nil {
        return "", err
    }
    dataDir := filepath.Join(homeDir, config.DataDir)
    filePath := filepath.Join(dataDir, filename)
    return filePath, nil
}

func ValidateAddress(addr string, port int) error {
    hostPort := net.JoinHostPort(addr, strconv.Itoa(port))
    if _, err := net.ResolveUDPAddr("udp", hostPort); err != nil {
        return errInvalidAddress
    }
    return nil
}