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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.plugin;

import com.google.common.annotations.VisibleForTesting;
import org.graylog2.shared.SuppressForbidden;

import java.net.InetAddress;
import java.net.InetSocketAddress;

import static java.util.Objects.requireNonNull;

/**
 * {@link InetSocketAddress} does not support finding out whether an IP address has been reverse looked up or not.
 * However, we need to avoid triggering a name service lookup unless specifically asked to.
 * This class exists to make the reverse lookup step explicit in the code.
 */
public class ResolvableInetSocketAddress {
    private final InetSocketAddress inetSocketAddress;
    private boolean reverseLookedUp = false;

    @VisibleForTesting
    protected ResolvableInetSocketAddress(InetSocketAddress inetSocketAddress) {
        this.inetSocketAddress = requireNonNull(inetSocketAddress);
    }

    public static ResolvableInetSocketAddress wrap(InetSocketAddress socketAddress) {
        if (socketAddress == null) {
            return null;
        }
        return new ResolvableInetSocketAddress(socketAddress);
    }

    @SuppressForbidden("Deliberate invocation")
    public String reverseLookup() {
        final String hostName = inetSocketAddress.getHostName();
        reverseLookedUp = true;
        return hostName;
    }

    public boolean isReverseLookedUp() {
        return reverseLookedUp;
    }

    public boolean isUnresolved() {
        return inetSocketAddress.isUnresolved();
    }

    public InetAddress getAddress() {
        return inetSocketAddress.getAddress();
    }

    public byte[] getAddressBytes() {
        return inetSocketAddress.getAddress().getAddress();
    }

    public int getPort() {
        return inetSocketAddress.getPort();
    }

    @SuppressForbidden("Deliberate invocation")
    public String getHostName() {
        if (isReverseLookedUp()) {
            return inetSocketAddress.getHostName();
        }
        return null;
    }

    public InetSocketAddress getInetSocketAddress() {
        return inetSocketAddress;
    }

    @Override
    public String toString() {
        if (isReverseLookedUp()) {
            return getHostName() + ":" + getPort();
        } else {
            return getAddress().getHostAddress() + ":" + getPort();
        }
    }
}