package ru.ulstu.user.util;

import org.apache.commons.lang3.RandomStringUtils;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import ru.ulstu.configuration.Constants;

public class UserUtils {
    private static final int DEF_COUNT = 20;

    public static String generateActivationKey() {
        return RandomStringUtils.randomNumeric(DEF_COUNT);
    }

    public static String generateResetKey() {
        return RandomStringUtils.randomNumeric(DEF_COUNT);
    }

    public static String getCurrentUserLogin() {
        final SecurityContext securityContext = SecurityContextHolder.getContext();
        if (securityContext == null) {
            return null;
        }
        final Authentication authentication = securityContext.getAuthentication();
        if (authentication.getPrincipal() instanceof UserDetails) {
            final UserDetails springSecurityUser = (UserDetails) authentication.getPrincipal();
            return springSecurityUser.getUsername();
        }
        if (authentication.getPrincipal() instanceof String) {
            return (String) authentication.getPrincipal();
        }
        return null;
    }

    public static String generatePassword() {
        return RandomStringUtils.randomAscii(Constants.MIN_PASSWORD_LENGTH, Constants.MAX_PASSWORD_LENGTH);
    }
}