/*
 * Copyright (c) 2007 INRIA
 * Copyright (c) 2011 The Boeing Company
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "mac16-address.h"

#include "ns3/address.h"
#include "ns3/assert.h"
#include "ns3/log.h"
#include "ns3/simulator.h"

#include <cstring>
#include <iomanip>
#include <iostream>

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("Mac16Address");

ATTRIBUTE_HELPER_CPP(Mac16Address);

#define ASCII_a (0x41)
#define ASCII_z (0x5a)
#define ASCII_A (0x61)
#define ASCII_Z (0x7a)
#define ASCII_COLON (0x3a)
#define ASCII_ZERO (0x30)

/**
 * Converts a char to lower case.
 * \param c the char
 * \returns the lower case
 */
static char
AsciiToLowCase(char c)
{
    if (c >= ASCII_a && c <= ASCII_z)
    {
        return c;
    }
    else if (c >= ASCII_A && c <= ASCII_Z)
    {
        return c + (ASCII_a - ASCII_A);
    }
    else
    {
        return c;
    }
}

uint64_t Mac16Address::m_allocationIndex = 0;

Mac16Address::Mac16Address()
{
    NS_LOG_FUNCTION(this);
    memset(m_address, 0, 2);
}

Mac16Address::Mac16Address(const char* str)
{
    NS_LOG_FUNCTION(this << str);
    int i = 0;
    while (*str != 0 && i < 2)
    {
        uint8_t byte = 0;
        while (*str != ASCII_COLON && *str != 0)
        {
            byte <<= 4;
            char low = AsciiToLowCase(*str);
            if (low >= ASCII_a)
            {
                byte |= low - ASCII_a + 10;
            }
            else
            {
                byte |= low - ASCII_ZERO;
            }
            str++;
        }
        m_address[i] = byte;
        i++;
        if (*str == 0)
        {
            break;
        }
        str++;
    }
    NS_ASSERT(i == 2);
}

Mac16Address::Mac16Address(uint16_t addr)
{
    NS_LOG_FUNCTION(this);
    m_address[1] = addr & 0xFF;
    m_address[0] = (addr >> 8) & 0xFF;
}

void
Mac16Address::CopyFrom(const uint8_t buffer[2])
{
    NS_LOG_FUNCTION(this << &buffer);
    memcpy(m_address, buffer, 2);
}

void
Mac16Address::CopyTo(uint8_t buffer[2]) const
{
    NS_LOG_FUNCTION(this << &buffer);
    memcpy(buffer, m_address, 2);
}

bool
Mac16Address::IsMatchingType(const Address& address)
{
    NS_LOG_FUNCTION(&address);
    return address.CheckCompatible(GetType(), 2);
}

Mac16Address::operator Address() const
{
    return ConvertTo();
}

Mac16Address
Mac16Address::ConvertFrom(const Address& address)
{
    NS_LOG_FUNCTION(address);
    NS_ASSERT(address.CheckCompatible(GetType(), 2));
    Mac16Address retval;
    address.CopyTo(retval.m_address);
    return retval;
}

Address
Mac16Address::ConvertTo() const
{
    NS_LOG_FUNCTION(this);
    return Address(GetType(), m_address, 2);
}

uint16_t
Mac16Address::ConvertToInt() const
{
    uint16_t addr = m_address[1] & (0xFF);
    addr |= (m_address[0] << 8) & (0xFF << 8);

    return addr;
}

Mac16Address
Mac16Address::Allocate()
{
    NS_LOG_FUNCTION_NOARGS();

    if (m_allocationIndex == 0)
    {
        Simulator::ScheduleDestroy(Mac16Address::ResetAllocationIndex);
    }

    m_allocationIndex++;
    Mac16Address address;
    address.m_address[0] = (m_allocationIndex >> 8) & 0xff;
    address.m_address[1] = m_allocationIndex & 0xff;
    return address;
}

void
Mac16Address::ResetAllocationIndex()
{
    NS_LOG_FUNCTION_NOARGS();
    m_allocationIndex = 0;
}

uint8_t
Mac16Address::GetType()
{
    NS_LOG_FUNCTION_NOARGS();

    static uint8_t type = Address::Register();
    return type;
}

Mac16Address
Mac16Address::GetBroadcast()
{
    NS_LOG_FUNCTION_NOARGS();

    static Mac16Address broadcast = Mac16Address("ff:ff");
    return broadcast;
}

Mac16Address
Mac16Address::GetMulticast(Ipv6Address address)
{
    NS_LOG_FUNCTION(address);

    uint8_t ipv6AddrBuf[16];
    address.GetBytes(ipv6AddrBuf);

    uint8_t addrBuf[2];

    addrBuf[0] = 0x80 | (ipv6AddrBuf[14] & 0x1F);
    addrBuf[1] = ipv6AddrBuf[15];

    Mac16Address multicastAddr;
    multicastAddr.CopyFrom(addrBuf);

    return multicastAddr;
}

bool
Mac16Address::IsBroadcast() const
{
    NS_LOG_FUNCTION(this);
    return m_address[0] == 0xff && m_address[1] == 0xff;
}

bool
Mac16Address::IsMulticast() const
{
    NS_LOG_FUNCTION(this);
    uint8_t val = m_address[0];
    val >>= 5;
    return val == 0x4;
}

std::ostream&
operator<<(std::ostream& os, const Mac16Address& address)
{
    uint8_t ad[2];
    address.CopyTo(ad);

    os.setf(std::ios::hex, std::ios::basefield);
    os.fill('0');
    for (uint8_t i = 0; i < 1; i++)
    {
        os << std::setw(2) << (uint32_t)ad[i] << ":";
    }
    // Final byte not suffixed by ":"
    os << std::setw(2) << (uint32_t)ad[1];
    os.setf(std::ios::dec, std::ios::basefield);
    os.fill(' ');
    return os;
}

std::istream&
operator>>(std::istream& is, Mac16Address& address)
{
    std::string v;
    is >> v;

    std::string::size_type col = 0;
    for (uint8_t i = 0; i < 2; ++i)
    {
        std::string tmp;
        std::string::size_type next;
        next = v.find(':', col);
        if (next == std::string::npos)
        {
            tmp = v.substr(col, v.size() - col);
            address.m_address[i] = std::stoul(tmp, nullptr, 16);
            break;
        }
        else
        {
            tmp = v.substr(col, next - col);
            address.m_address[i] = std::stoul(tmp, nullptr, 16);
            col = next + 1;
        }
    }
    return is;
}

} // namespace ns3
