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package cc.neckbeard.utils;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import java.util.regex.Pattern;

public class UuidConverter {

    private static final String FORMAT = "$1-$2-$3-$4-$5";
    private static final Pattern PATTERN = Pattern.compile("([0-9a-fA-F]{8})-?([0-9a-fA-F]{4})-?([0-9a-fA-F]{4})-?([0-9a-fA-F]{4})-?([0-9a-fA-F]{12})");

    /**
     * Generates a UUID Object from a UUID String.

     * The String can either contain a dashed or undashed UUID.
     *
     * @param string UUID String
     * @return UUID Object
     * @throws IllegalArgumentException Thrown if UUID is not valid.
     */
    public static @Nullable UUID of(@NotNull final String string) {
        if (!PATTERN.matcher(string).matches()) return null;
        try {
            return UUID.fromString(string.replaceFirst(PATTERN.toString(), FORMAT));
        } catch (IllegalArgumentException ignored) {
        }
        return null;
    }

    /**
     * Converts a Collection of UUID objects to a Set of Strings.
     *
     * @return String representations of UUIDs stored in a Set.
     */
    public static @NotNull Set stringify(@NotNull final Set uuids) {
        Set set = new HashSet<>();
        for (UUID uuid : uuids) {
            if (uuid == null) continue;
            set.add(uuid.toString());
        }
        return set;
    }

    /**
     * Converts a Collection of UUID objects to a Set of Strings.
     *
     * @return String representations of UUIDs stored in a Set.
     */
    public static @NotNull Set stringify(@NotNull final Collection uuids) {
        return stringify(uuids);
    }

}