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package com.easy.core.util;

public class IPV4Util {

    public static final String DEFAULT_SUBNET_MASK_A = "255.0.0.0";
    public static final String DEFAULT_SUBNET_MASK_B = "255.255.0.0";
    public static final String DEFAULT_SUBNET_MASK_C = "255.255.255.0";

    public static final String TYPE_IP_A = "A";
    public static final String TYPE_IP_B = "B";
    public static final String TYPE_IP_C = "C";
    public static final String TYPE_IP_D = "D";
    public static final String TYPE_IP_LOCATE = "locate";

    public static boolean isSameAddress(String resourceIp, String requestIp){
        if(getIpType(resourceIp).equals(getIpType(requestIp))){
            return isSameAddress(resourceIp, requestIp, getIpDefaultMask(getIpType(resourceIp)));
        }
        return false;
    }

    public static boolean isSameAddress(String resourceIp, String requestIp, String subnetMask){
        String resourceAddr = getAddrIp(resourceIp, subnetMask);
        String requestAddr = getAddrIp(requestIp, subnetMask);
        if(resourceAddr.equals(requestAddr)){
            return true;
        }
        return false;
    }

    private static String getIpDefaultMask(String ipType){
        switch (ipType){
            case TYPE_IP_A: return DEFAULT_SUBNET_MASK_A;
            case TYPE_IP_B: return DEFAULT_SUBNET_MASK_B;
            case TYPE_IP_C: return DEFAULT_SUBNET_MASK_C;
            default: throw new IllegalArgumentException("not found mask address");
        }
    }

    private static String getBinaryIp(String data){
        String[] datas = data.split("\\.");
        String binaryIp = "";
        for(String ipStr : datas){
            long signIp = Long.parseLong(ipStr);
            String binary = Long.toBinaryString(signIp);
            long binaryInt = Long.parseLong(binary);
            binaryIp += String.format("%08d", binaryInt);
        }

        return binaryIp;
    }

    private static String getAddrIp(String ip, String subnetMask){
        StringBuilder addrIp = new StringBuilder();
        String binaryIp = getBinaryIp(ip);
        String binarySubnetMask = getBinaryIp(subnetMask);
        for(int i = 0 ; i < 32 ; i++){
            byte ipByte = Byte.parseByte(String.valueOf(binaryIp.charAt(i)));
            byte subnetMaskByte = Byte.parseByte(String.valueOf(binarySubnetMask.charAt(i)));
            addrIp.append(ipByte & subnetMaskByte);
        }
        return addrIp.toString();
    }

    public static String getIpType(String ip){
        String binaryIp = getBinaryIp(ip);
        if(binaryIp.startsWith("127")){
            return TYPE_IP_LOCATE;
        }
        if(binaryIp.startsWith("0")){
            return TYPE_IP_A;
        }
        if(binaryIp.startsWith("10")){
            return TYPE_IP_B;
        }
        if(binaryIp.startsWith("110")){
            return TYPE_IP_C;
        }
        if(binaryIp.startsWith("1110")){
            return TYPE_IP_D;
        }
        throw new IllegalArgumentException("invalid ip address");
    }
}