/*
 * MIT License
 *
 * Copyright (c) 2018 emufog contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package emufog.graph;

import emufog.settings.Settings;

/**
 * The UniqueIPProvider calculates IP address within the subnet
 * address space defined in the base address of the given settings.
 */
class UniqueIPProvider {

    /* the last assigned IP in the network */
    private String lastIP;

    /**
     * Creates a new IP provider with the base address of the
     * subnet from the given settings.
     *
     * @param settings settings for the subnet
     */
    UniqueIPProvider(Settings settings) {
        lastIP = settings.baseAddress;
    }

    /**
     * Calculates and returns the next available IP address in the subnet.
     *
     * @return IP address
     */
    String getNextIPV4Address() {
        String[] nums = lastIP.split("\\.");
        int i = (Integer.parseInt(nums[0]) << 24 | Integer.parseInt(nums[2]) << 8
                | Integer.parseInt(nums[1]) << 16 | Integer.parseInt(nums[3])) + 1;

        // If you wish to skip over .255 addresses.
        if ((byte) i == -1) {
            i++;
        }

        lastIP = String.format("%d.%d.%d.%d", i >>> 24 & 0xFF, i >> 16 & 0xFF,
                i >> 8 & 0xFF, i >> 0 & 0xFF);

        return lastIP;
    }
}

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