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/*
 * Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.client.util;

import com.hazelcast.client.impl.connection.Addresses;
import com.hazelcast.logging.Logger;
import com.hazelcast.cluster.Address;
import com.hazelcast.internal.util.AddressUtil;
import com.hazelcast.internal.util.AddressUtil.AddressHolder;

import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import static com.hazelcast.internal.util.AddressUtil.getPossibleInetAddressesFor;

/**
 * This is a client side utility class for working with addresses and cluster connections
 */
public final class AddressHelper {

    private static final int MAX_PORT_TRIES = 3;
    private static final int INITIAL_FIRST_PORT = 5701;

    private AddressHelper() {
    }

    public static String getScopedHostName(AddressHolder addressHolder) {
        return addressHolder.getScopeId() != null
                ? addressHolder.getAddress() + '%' + addressHolder.getScopeId()
                : addressHolder.getAddress();
    }

    public static Addresses getSocketAddresses(String address) {
        AddressHolder addressHolder = AddressUtil.getAddressHolder(address, -1);
        String scopedAddress = getScopedHostName(addressHolder);

        int port = addressHolder.getPort();
        int maxPortTryCount = 1;
        if (port == -1) {
            maxPortTryCount = MAX_PORT_TRIES;
        }
        return getPossibleSocketAddresses(port, scopedAddress, maxPortTryCount);
    }

    public static Addresses getPossibleSocketAddresses(int port, String scopedAddress, int portTryCount) {
        InetAddress inetAddress = null;
        try {
            inetAddress = InetAddress.getByName(scopedAddress);
        } catch (UnknownHostException ignored) {
            Logger.getLogger(AddressHelper.class).finest("Address not available", ignored);
        }

        int possiblePort = port;
        if (possiblePort == -1) {
            possiblePort = INITIAL_FIRST_PORT;
        }
        LinkedList addressList = new LinkedList();

        if (inetAddress == null) {
            for (int i = 0; i < portTryCount; i++) {
                try {
                    addressList.add(new Address(scopedAddress, possiblePort + i));
                } catch (UnknownHostException ignored) {
                    Logger.getLogger(AddressHelper.class).finest("Address not available", ignored);
                }
            }
        } else if (inetAddress instanceof Inet4Address) {
            for (int i = 0; i < portTryCount; i++) {
                addressList.add(new Address(scopedAddress, inetAddress, possiblePort + i));
            }
        } else if (inetAddress instanceof Inet6Address) {
            Collection possibleInetAddresses = getPossibleInetAddressesFor((Inet6Address) inetAddress);
            for (Inet6Address inet6Address : possibleInetAddresses) {
                for (int i = 0; i < portTryCount; i++) {
                    addressList.add(new Address(scopedAddress, inet6Address, possiblePort + i));
                }
            }
        }

        return toAddresses(addressList);
    }

    private static Addresses toAddresses(List addressList) {
        Addresses result = new Addresses();
        if (addressList.size() > 0) {
            result.primary().add(addressList.remove(0));
            result.secondary().addAll(addressList);
        }
        return result;
    }
}