src/main/java/eu/olli/cowmoonication/util/Utils.java


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package eu.olli.cowmoonication.util;

import com.mojang.realmsclient.util.Pair;
import org.apache.commons.lang3.text.WordUtils;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DurationFormatUtils;

import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;

public final class Utils {
    public static final Pattern VALID_UUID_PATTERN = Pattern.compile("^(\\w{8})-(\\w{4})-(\\w{4})-(\\w{4})-(\\w{12})$");
    private static final Pattern VALID_USERNAME = Pattern.compile("^[\\w]{1,16}$");

    private Utils() {
    }

    public static boolean isValidUuid(String uuid) {
        return VALID_UUID_PATTERN.matcher(uuid).matches();
    }

    public static boolean isValidMcName(String username) {
        return VALID_USERNAME.matcher(username).matches();
    }

    public static String fancyCase(String string) {
        return WordUtils.capitalizeFully(string.replace('_', ' '));
    }

    /**
     * Turn timestamp into pretty-formatted duration and date details.
     *
     * @param timestamp last login/logout
     * @return 1st: duration between timestamp and now in words; 2nd: formatted date if time differences is >24h, otherwise null
     */
    public static Pair<String, String> getLastOnlineWords(long timestamp) {
        long duration = System.currentTimeMillis() - timestamp;
        long daysPast = TimeUnit.MILLISECONDS.toDays(duration);

        String dateFormatted = null;
        if (daysPast > 1) {
            dateFormatted = DateFormatUtils.format(timestamp, "dd-MMM-yyyy");
        }

        if (daysPast > 31) {
            return Pair.of(
                    DurationFormatUtils.formatPeriod(timestamp, System.currentTimeMillis(), (daysPast > 365 ? "y 'years' " : "") + "M 'months' d 'days'"),
                    dateFormatted);
        } else {
            return Pair.of(
                    DurationFormatUtils.formatDurationWords(duration, true, true),
                    dateFormatted);
        }
    }
}