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/*
 * Copyright 2012 AMG.lab, a Bull Group Company
 * 
 * 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 org.xlcloud.network.validatation;

import org.apache.commons.net.util.SubnetUtils;

import static org.xlcloud.validation.Validations.validateThat;

import org.xlcloud.rest.exception.DuplicatedEntityException;
import org.xlcloud.rest.exception.DuplicatedEntityException.EntityType;
import org.xlcloud.rest.exception.InternalErrorException.ErrorType;
import org.xlcloud.rest.exception.ValidationException.ValidationFailureType;
import org.xlcloud.rest.exception.ValidationException;

/**
 * Validator for CIDR address
 * 
 * @author mkaminsk, AMG.net
 */
public class CIDRValidator {

    /**
     * Validates if CIDR is has valid format and validates if 0 in mask are
     * equal 0 in IpAddress
     */
    public static void validateCIDR(String cidr) {
        toSubnetUtils(cidr);
    }

    private static SubnetUtils toSubnetUtils(String cidr) {
        validateThat(cidr).as("cidr").isNotBlank();
        SubnetUtils utils = null;

        try {
            utils = new SubnetUtils(cidr);
        } catch (IllegalArgumentException ex) {
            throw new ValidationException("Invalid CIDR format",ValidationFailureType.CIDR_FORMAT);
        }

        int cidrAddress = ipAddressToInt(utils.getInfo().getAddress());
        int lowestAddress = ipAddressToInt(utils.getInfo().getLowAddress());
        if (cidrAddress > lowestAddress) {
            throw new ValidationException("Ip address for CIDR has numbers for 0 mask",ValidationFailureType.CIDR_FORMAT);
        }

        return utils;
    }

    /**
     * Validates if CIDR is has valid format and validates if 0 in mask are
     * equal 0 in IpAddress
     * 
     * @throws ValidationException
     *             , when at least one of CIDR has invalid format
     * @throws DuplicatedEntityException
     *             , when CIDR addresses are overlaped
     */
    public static void validateSeparableCIDR(String incoming, String external) {

        SubnetUtils utils1 = toSubnetUtils(incoming);
        SubnetUtils utils2 = toSubnetUtils(external);

        String ipAddress1 = utils1.getInfo().getAddress();
        String ipAddress2 = utils2.getInfo().getAddress();

        String mask1 = utils1.getInfo().getNetmask();
        String mask2 = utils2.getInfo().getNetmask();

        int intMask1 = ipAddressToInt(mask1);
        int intMask2 = ipAddressToInt(mask2);
        int mask = (Integer.valueOf(incoming.split("/")[1]) < Integer.valueOf(external.split("/")[1])) ? (intMask1) : (intMask2);

        if ((ipAddressToInt(ipAddress1) & mask) == (ipAddressToInt(ipAddress2) & mask)) {
            throw new DuplicatedEntityException("CIDR address has overlap ranges", EntityType.CIDR_ADDRESS, incoming);
        }
    }

    /**
     * Convert IPs into ints (32 bits). E.g. 157.166.224.26 becomes 10011101
     * 10100110 11100000 00011010
     * 
     * @param ipaddress
     * @return
     */
    private static int ipAddressToInt(String addressIp) {
        String[] ipaddress = addressIp.split("\\.");
        return ((Integer.valueOf(ipaddress[0]) << 24) & 0xFF000000) | ((Integer.valueOf(ipaddress[1]) << 16) & 0xFF0000)
                | ((Integer.valueOf(ipaddress[2]) << 8) & 0xFF00) | (Integer.valueOf(ipaddress[3]) & 0xFF);
    }

}