/*
	This file is part of Fennix Kernel.

	Fennix Kernel is free software: you can redistribute it and/or
	modify it under the terms of the GNU General Public License as
	published by the Free Software Foundation, either version 3 of
	the License, or (at your option) any later version.

	Fennix Kernel 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 Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef __FENNIX_KERNEL_NETWORK_H__
#define __FENNIX_KERNEL_NETWORK_H__

#include <types.h>
#include <printf.h>

// #define DEBUG_NETWORK 1

#ifdef DEBUG_NETWORK
#define netdbg(m, ...) debug(m, ##__VA_ARGS__)
void DbgNetwork();
void DbgDumpData(const char *Description, void *Address, unsigned long Length);
#else
#define netdbg(m, ...)
static inline void DbgNetwork() { return; }
static inline void DbgDumpData(const char *Description, void *Address, unsigned long Length)
{
	UNUSED(Description);
	UNUSED(Address);
	UNUSED(Length);
	return;
}
#endif

enum Endianness
{
	LITTLE_ENDIAN,
	BIG_ENDIAN
};

struct MediaAccessControl
{
	uint8_t Address[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
	Endianness Endianess = LITTLE_ENDIAN;

	inline bool operator==(const MediaAccessControl &lhs) const
	{
		return lhs.Address[0] == this->Address[0] &&
			   lhs.Address[1] == this->Address[1] &&
			   lhs.Address[2] == this->Address[2] &&
			   lhs.Address[3] == this->Address[3] &&
			   lhs.Address[4] == this->Address[4] &&
			   lhs.Address[5] == this->Address[5];
	}

	inline bool operator==(const uint48_t &lhs) const
	{
		MediaAccessControl MAC;
		MAC.Address[0] = (uint8_t)((lhs >> 40) & 0xFF);
		MAC.Address[1] = (uint8_t)((lhs >> 32) & 0xFF);
		MAC.Address[2] = (uint8_t)((lhs >> 24) & 0xFF);
		MAC.Address[3] = (uint8_t)((lhs >> 16) & 0xFF);
		MAC.Address[4] = (uint8_t)((lhs >> 8) & 0xFF);
		MAC.Address[5] = (uint8_t)(lhs & 0xFF);
		return MAC.Address[0] == this->Address[0] &&
			   MAC.Address[1] == this->Address[1] &&
			   MAC.Address[2] == this->Address[2] &&
			   MAC.Address[3] == this->Address[3] &&
			   MAC.Address[4] == this->Address[4] &&
			   MAC.Address[5] == this->Address[5];
	}

	inline bool operator!=(const MediaAccessControl &lhs) const { return !(*this == lhs); }
	inline bool operator!=(const uint48_t &lhs) const { return !(*this == lhs); }

	inline uint48_t ToHex()
	{
		return ((uint48_t)this->Address[0] << 40) |
			   ((uint48_t)this->Address[1] << 32) |
			   ((uint48_t)this->Address[2] << 24) |
			   ((uint48_t)this->Address[3] << 16) |
			   ((uint48_t)this->Address[4] << 8) |
			   ((uint48_t)this->Address[5]);
	}

	inline MediaAccessControl FromHex(uint48_t Hex)
	{
		this->Address[0] = (uint8_t)((Hex >> 40) & 0xFF);
		this->Address[1] = (uint8_t)((Hex >> 32) & 0xFF);
		this->Address[2] = (uint8_t)((Hex >> 24) & 0xFF);
		this->Address[3] = (uint8_t)((Hex >> 16) & 0xFF);
		this->Address[4] = (uint8_t)((Hex >> 8) & 0xFF);
		this->Address[5] = (uint8_t)(Hex & 0xFF);
		return *this;
	}

	inline bool Valid()
	{
		// TODO: More complex MAC validation
		return (this->Address[0] != 0 ||
				this->Address[1] != 0 ||
				this->Address[2] != 0 ||
				this->Address[3] != 0 ||
				this->Address[4] != 0 ||
				this->Address[5] != 0) &&
			   (this->Address[0] != 0xFF ||
				this->Address[1] != 0xFF ||
				this->Address[2] != 0xFF ||
				this->Address[3] != 0xFF ||
				this->Address[4] != 0xFF ||
				this->Address[5] != 0xFF);
	}

	char *ToString()
	{
		static char Buffer[18];
		sprintf(Buffer, "%02X:%02X:%02X:%02X:%02X:%02X", this->Address[0], this->Address[1], this->Address[2], this->Address[3], this->Address[4], this->Address[5]);
		return Buffer;
	}
};

/* There's a confusion between LSB and MSB. Not sure if "ToStringLittleEndian" and "ToStringBigEndian" are implemented correctly.
   Because x86 is a LSB architecture, I'm assuming that the "ToStringLittleEndian" is correct? */
struct InternetProtocol
{
	struct Version4
	{
		uint8_t Address[4] = {255, 255, 255, 255};
		Endianness Endianess = LITTLE_ENDIAN;

		inline bool operator==(const InternetProtocol::Version4 &lhs) const
		{
			return lhs.Address[0] == this->Address[0] &&
				   lhs.Address[1] == this->Address[1] &&
				   lhs.Address[2] == this->Address[2] &&
				   lhs.Address[3] == this->Address[3];
		}

		inline bool operator==(const uint32_t &lhs) const
		{
			InternetProtocol::Version4 IP;
			IP.Address[0] = (uint8_t)((lhs >> 24) & 0xFF);
			IP.Address[1] = (uint8_t)((lhs >> 16) & 0xFF);
			IP.Address[2] = (uint8_t)((lhs >> 8) & 0xFF);
			IP.Address[3] = (uint8_t)(lhs & 0xFF);

			return IP.Address[0] == this->Address[0] &&
				   IP.Address[1] == this->Address[1] &&
				   IP.Address[2] == this->Address[2] &&
				   IP.Address[3] == this->Address[3];
		}

		inline bool operator!=(const InternetProtocol::Version4 &lhs) const { return !(*this == lhs); }
		inline bool operator!=(const uint32_t &lhs) const { return !(*this == lhs); }

		inline uint32_t ToHex()
		{
			return ((uint32_t)this->Address[0] << 24) |
				   ((uint32_t)this->Address[1] << 16) |
				   ((uint32_t)this->Address[2] << 8) |
				   ((uint32_t)this->Address[3]);
		}

		inline InternetProtocol::Version4 FromHex(uint32_t Hex)
		{
			this->Address[0] = (uint8_t)((Hex >> 24) & 0xFF);
			this->Address[1] = (uint8_t)((Hex >> 16) & 0xFF);
			this->Address[2] = (uint8_t)((Hex >> 8) & 0xFF);
			this->Address[3] = (uint8_t)(Hex & 0xFF);
			return *this;
		}

		char *ToStringLittleEndian()
		{
			static char Buffer[16];
			sprintf(Buffer, "%d.%d.%d.%d", this->Address[0], this->Address[1], this->Address[2], this->Address[3]);
			return Buffer;
		}

		char *ToStringBigEndian()
		{
			static char Buffer[16];
			sprintf(Buffer, "%d.%d.%d.%d", this->Address[3], this->Address[2], this->Address[1], this->Address[0]);
			return Buffer;
		}
	} v4;

	struct Version6
	{
		uint16_t Address[8] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
		Endianness Endianess = LITTLE_ENDIAN;

		inline bool operator==(const InternetProtocol::Version6 &lhs) const
		{
			return lhs.Address[0] == this->Address[0] &&
				   lhs.Address[1] == this->Address[1] &&
				   lhs.Address[2] == this->Address[2] &&
				   lhs.Address[3] == this->Address[3] &&
				   lhs.Address[4] == this->Address[4] &&
				   lhs.Address[5] == this->Address[5] &&
				   lhs.Address[6] == this->Address[6] &&
				   lhs.Address[7] == this->Address[7];
		}

		inline bool operator!=(const InternetProtocol::Version6 &lhs) const { return !(*this == lhs); }

		char *ToStringLittleEndian()
		{
			static char Buffer[40];
			sprintf(Buffer, "%04X:%04X:%04X:%04X:%04X:%04X:%04X:%04X", this->Address[0], this->Address[1], this->Address[2], this->Address[3], this->Address[4], this->Address[5], this->Address[6], this->Address[7]);
			return Buffer;
		}

		char *ToStringBigEndian()
		{
			static char Buffer[40];
			sprintf(Buffer, "%04X:%04X:%04X:%04X:%04X:%04X:%04X:%04X", this->Address[7], this->Address[6], this->Address[5], this->Address[4], this->Address[3], this->Address[2], this->Address[1], this->Address[0]);
			return Buffer;
		}
	} v6;
};

uint16_t CalculateChecksum(uint16_t *Data, size_t Length);

#endif // !__FENNIX_KERNEL_NETWORK_H__