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

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-9-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

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

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

namespace juce
{

Uuid::Uuid()
{
    Random r;

    for (size_t i = 0; i < sizeof (uuid); ++i)
        uuid[i] = (uint8) (r.nextInt (256));

    // To make it RFC 4122 compliant, need to force a few bits...
    uuid[6] = (uuid[6] & 0x0f) | 0x40;
    uuid[8] = (uuid[8] & 0x3f) | 0x80;
}

Uuid::Uuid (const Uuid& other) noexcept
{
    std::copy (other.uuid, other.uuid + sizeInBytes, uuid);
}

Uuid& Uuid::operator= (const Uuid& other) noexcept
{
    Uuid { other }.swap (*this);
    return *this;
}

bool Uuid::operator== (const Uuid& other) const noexcept    { return memcmp (uuid, other.uuid, sizeof (uuid)) == 0; }
bool Uuid::operator!= (const Uuid& other) const noexcept    { return ! operator== (other); }

bool Uuid::operator<  (const Uuid& other) const noexcept    { return compare (other) < 0; }
bool Uuid::operator>  (const Uuid& other) const noexcept    { return compare (other) > 0; }
bool Uuid::operator<= (const Uuid& other) const noexcept    { return compare (other) <= 0; }
bool Uuid::operator>= (const Uuid& other) const noexcept    { return compare (other) >= 0; }

int Uuid::compare (Uuid other) const noexcept
{
    for (size_t i = 0; i < sizeof (uuid); ++i)
        if (int diff = uuid[i] - (int) other.uuid[i])
            return diff > 0 ? 1 : -1;

    return 0;
}

Uuid Uuid::null() noexcept
{
    return Uuid ((const uint8*) nullptr);
}

bool Uuid::isNull() const noexcept
{
    for (auto i : uuid)
        if (i != 0)
            return false;

    return true;
}

String Uuid::getHexRegion (int start, int length) const
{
    return String::toHexString (uuid + start, length, 0);
}

String Uuid::toString() const
{
    return getHexRegion (0, 16);
}

String Uuid::toDashedString() const
{
    return getHexRegion (0, 4)
            + "-" + getHexRegion (4, 2)
            + "-" + getHexRegion (6, 2)
            + "-" + getHexRegion (8, 2)
            + "-" + getHexRegion (10, 6);
}

Uuid::Uuid (const String& uuidString)
{
    MemoryBlock mb;
    mb.loadFromHexString (uuidString);
    mb.ensureSize (sizeof (uuid), true);
    mb.copyTo (uuid, 0, sizeof (uuid));
}

Uuid& Uuid::operator= (const String& uuidString)
{
    Uuid { uuidString }.swap (*this);
    return *this;
}

Uuid::Uuid (const uint8* const rawData) noexcept
{
    operator= (rawData);
}

Uuid& Uuid::operator= (const uint8* const rawData) noexcept
{
    if (rawData != nullptr)
        memcpy (uuid, rawData, sizeof (uuid));
    else
        zeromem (uuid, sizeof (uuid));

    return *this;
}

uint32 Uuid::getTimeLow() const noexcept                  { return ByteOrder::bigEndianInt (uuid); }
uint16 Uuid::getTimeMid() const noexcept                  { return ByteOrder::bigEndianShort (uuid + 4); }
uint16 Uuid::getTimeHighAndVersion() const noexcept       { return ByteOrder::bigEndianShort (uuid + 6); }
uint8  Uuid::getClockSeqAndReserved() const noexcept      { return uuid[8]; }
uint8  Uuid::getClockSeqLow() const noexcept              { return uuid[9]; }
uint64 Uuid::getNode() const noexcept                     { return (((uint64) ByteOrder::bigEndianShort (uuid + 10)) << 32) + ByteOrder::bigEndianInt (uuid + 12); }

uint64 Uuid::hash() const noexcept
{
    uint64 result = 0;

    for (auto n : uuid)
        result = ((uint64) 101) * result + n;

    return result;
}

void Uuid::swap (Uuid& other) noexcept
{
    uint8 temp[sizeInBytes];
    std::copy (uuid, uuid + sizeInBytes, temp);
    std::copy (other.uuid, other.uuid + sizeInBytes, uuid);
    std::copy (temp, temp + sizeInBytes, other.uuid);
}

} // namespace juce
