/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    Represents an IP address.

    @tags{Core}
*/
class JUCE_API  IPAddress  final
{
public:
    //==============================================================================
    /** Returns an IP address meaning "any", equivalent to 0.0.0.0 (IPv4) or ::, (IPv6)  */
    static IPAddress any() noexcept;

    /** Returns an IPv4 address meaning "broadcast" (255.255.255.255) */
    static IPAddress broadcast() noexcept;

    /** Returns an IPv4 or IPv6 address meaning "localhost", equivalent to 127.0.0.1 (IPv4) or ::1 (IPv6) */
    static IPAddress local (bool IPv6 = false) noexcept;

    //==============================================================================
    /** Populates a list of all the IP addresses that this machine is using. */
    static void findAllAddresses (Array<IPAddress>& results, bool includeIPv6 = false);

    /** Populates a list of all the IP addresses that this machine is using. */
    static Array<IPAddress> getAllAddresses (bool includeIPv6 = false);

    /** Returns the first 'real' address for the local machine.
        Unlike local(), this will attempt to find the machine's actual assigned
        address rather than "127.0.0.1". If there are multiple network cards, this
        may return any of their addresses. If it doesn't find any, then it'll return
        local() as a fallback.
    */
    static IPAddress getLocalAddress (bool includeIPv6 = false);

    //==============================================================================
    /** Creates a null address - 0.0.0.0 (IPv4) or ::, (IPv6) */
    IPAddress() noexcept;

    /** Creates an IPv4 or IPv6 address by reading 4 or 16 bytes from an array.
        @param bytes The array containing the bytes to read.
        @param IPv6 if true indicates that 16 bytes should be read instead of 4.
    */
    explicit IPAddress (const uint8* bytes, bool IPv6 = false) noexcept;

    /** Creates an IPv6 address from an array of 8 16-bit integers
        @param bytes The array containing the bytes to read.
    */
    explicit IPAddress (const uint16* bytes) noexcept;

    /** Creates an IPv4 address from 4 bytes. */
    IPAddress (uint8 address1, uint8 address2, uint8 address3, uint8 address4) noexcept;

    /** Creates an IPv6 address from 8 16-bit integers */
    IPAddress (uint16 address1, uint16 address2, uint16 address3, uint16 address4,
               uint16 address5, uint16 address6, uint16 address7, uint16 address8) noexcept;

    /** Creates an IPv4 address from a packed 32-bit integer, where the
        MSB is the first number in the address, and the LSB is the last.
    */
    explicit IPAddress (uint32 asNativeEndian32Bit) noexcept;

    /** Parses a string IP address of the form "1.2.3.4" (IPv4) or "1:2:3:4:5:6:7:8" (IPv6). */
    explicit IPAddress (const String& address);

    /** Returns whether the address contains the null address (e.g. 0.0.0.0). */
    bool isNull() const;

    //==============================================================================
    /** Returns a dot- or colon-separated string in the form "1.2.3.4" (IPv4) or "1:2:3:4:5:6:7:8" (IPv6). */
    String toString() const;

    /** Compares this IPAddress with another.

        @returns 0 if the two addresses are identical, negative if this address is smaller than
                 the other one, or positive if is greater.
    */
    int compare (const IPAddress&) const noexcept;

    bool operator== (const IPAddress&) const noexcept;
    bool operator!= (const IPAddress&) const noexcept;
    bool operator<  (const IPAddress&) const noexcept;
    bool operator>  (const IPAddress&) const noexcept;
    bool operator<= (const IPAddress&) const noexcept;
    bool operator>= (const IPAddress&) const noexcept;

    //==============================================================================
    /** The elements of the IP address. */
    uint8 address[16];

    bool isIPv6 = false;

    //==============================================================================
    /** Returns a formatted version of the provided IPv6 address conforming to RFC 5952 with leading zeros suppressed,
        lower case characters, and double-colon notation used to represent contiguous 16-bit fields of zeros.

        @param unformattedAddress    the IPv6 address to be formatted
    */
    static String getFormattedAddress (const String& unformattedAddress);

    /** Returns true if the given IP address is an IPv4-mapped IPv6 address. */
    static bool isIPv4MappedAddress (const IPAddress& mappedAddress);

    /** Converts an IPv4-mapped IPv6 address to an IPv4 address.
        If the address is not IPv4-mapped, this will return a null address.
    */
    static IPAddress convertIPv4MappedAddressToIPv4 (const IPAddress& mappedAddress);

    /** Converts an IPv4 address to an IPv4-mapped IPv6 address. */
    static IPAddress convertIPv4AddressToIPv4Mapped (const IPAddress& addressToMap);

    /** If the IPAdress is the address of an interface on the machine, returns the associated broadcast address.
        If the address is not an interface, it will return a null address.
    */
    static IPAddress getInterfaceBroadcastAddress (const IPAddress& interfaceAddress);
};

} // namespace juce
