/****************************************************************************
*                                                                           *
* Project 64 - A Nintendo 64 emulator.                                      *
* http://www.pj64-emu.com/                                                  *
* Copyright (C) 2012 Project64. All rights reserved.                        *
*                                                                           *
* License:                                                                  *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html                        *
*                                                                           *
****************************************************************************/
#include "stdafx.h"
#include <time.h>

CEeprom::CEeprom(bool ReadOnly):
	m_ReadOnly(ReadOnly),
	m_hFile(NULL)
{
	memset(m_EEPROM,0xFF,sizeof(m_EEPROM));
}

CEeprom::~CEeprom()
{
	if (m_hFile)
	{
		CloseHandle(m_hFile);
		m_hFile = NULL;
	}
}

unsigned char byte2bcd(int n)
{
	n %= 100;
	return (unsigned char)(((n / 10) << 4) | (n % 10));
}

void CEeprom::EepromCommand ( BYTE * Command)
{
	time_t curtime_time;
	struct tm curtime;

	if (g_System->m_SaveUsing == SaveChip_Auto)
	{
		g_System->m_SaveUsing = SaveChip_Eeprom_4K;
	}

	switch (Command[2])
	{
	case 0: // check
		if (g_System->m_SaveUsing != SaveChip_Eeprom_4K &&  g_System->m_SaveUsing != SaveChip_Eeprom_16K)
		{
			Command[1] |= 0x80;
			break;
		}
		if (Command[1] != 3)
		{ 
			Command[1] |= 0x40; 
			if ((Command[1] & 3) > 0)
				Command[3] = 0x00;
			if ((Command[1] & 3) > 1)
				 Command[4] = (g_System->m_SaveUsing == SaveChip_Eeprom_4K) ? 0x80 : 0xC0;
			if ((Command[1] & 3) > 2)
				Command[5] = 0x00;
		}
		else
		{
			Command[3] = 0x00;
			Command[4] = g_System->m_SaveUsing == SaveChip_Eeprom_4K?0x80:0xC0;
			Command[5] = 0x00;
		}
		break;
	case 4: // Read from Eeprom
		if (Command[0] != 2 && bHaveDebugger())
		{
			g_Notify->DisplayError(L"What am I meant to do with this Eeprom Command");
		}
		if (Command[1] != 8 && bHaveDebugger())
		{
			g_Notify->DisplayError(L"What am I meant to do with this Eeprom Command");
		}
		ReadFrom(&Command[4],Command[3]);
		break;
	case 5: //Write to Eeprom
		if (Command[0] != 10 && bHaveDebugger())
		{
			g_Notify->DisplayError(L"What am I meant to do with this Eeprom Command");
		}
		if (Command[1] != 1 && bHaveDebugger())
		{
			g_Notify->DisplayError(L"What am I meant to do with this Eeprom Command");
		}
		WriteTo(&Command[4],Command[3]);
		break;
	case 6: //RTC Status query
		Command[3] = 0x00;
		Command[4] = 0x10;
		Command[5] = 0x00;
		break;
	case 7: //Read RTC block
		switch (Command[3])
		{
			case 0: //Block number
				Command[4] = 0x00;
				Command[5] = 0x02;
				Command[12] = 0x00;
				break;
			case 1:
				//read block, Command[2], Unimplemented
				break;
			case 2: //Set RTC Time
				time(&curtime_time);
				memcpy(&curtime, localtime(&curtime_time), sizeof(curtime)); // fd's fix
				Command[4]  = byte2bcd(curtime.tm_sec);
				Command[5]  = byte2bcd(curtime.tm_min);
				Command[6]  = 0x80 + byte2bcd(curtime.tm_hour);
				Command[7]  = byte2bcd(curtime.tm_mday);
				Command[8]  = byte2bcd(curtime.tm_wday);
				Command[9]  = byte2bcd(curtime.tm_mon + 1);
				Command[10] = byte2bcd(curtime.tm_year);
				Command[11] = byte2bcd(curtime.tm_year / 100);
				Command[12] = 0x00;	// status
				break;
		}
		break;
	case 8:
		//Write RTC, unimplemented
		if (g_Settings->LoadDword(Debugger_ShowPifErrors))
		{
			g_Notify->DisplayError(L"Write RTC, unimplemented");
		}
		break;
	default:
		if (g_Settings->LoadDword(Debugger_ShowPifErrors))
		{
			g_Notify->DisplayError(stdstr_f("Unknown EepromCommand %d",Command[2]).ToUTF16().c_str());
		}
	}
}

void CEeprom::LoadEeprom()
{
	CPath FileName;
	DWORD dwRead;

	memset(m_EEPROM,0xFF,sizeof(m_EEPROM));

	FileName.SetDriveDirectory( g_Settings->LoadStringVal(Directory_NativeSave).c_str());
	FileName.SetName(g_Settings->LoadStringVal(Game_GameName).c_str());
	FileName.SetExtension("eep");

	if (!FileName.DirectoryExists())
	{
		FileName.CreateDirectory();
	}

	m_hFile = CreateFile(FileName,m_ReadOnly ? GENERIC_READ : GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,OPEN_ALWAYS,
		FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS, NULL);
	if (m_hFile == INVALID_HANDLE_VALUE) 
	{
		WriteTraceF(TraceError,__FUNCTION__ ": Failed to open (%s), ReadOnly = %d, LastError = %X",(LPCTSTR)FileName, m_ReadOnly, GetLastError());
		g_Notify->DisplayError(GS(MSG_FAIL_OPEN_EEPROM));
		return;
	}
	SetFilePointer(m_hFile,0,NULL,FILE_BEGIN);	
	ReadFile(m_hFile,m_EEPROM,sizeof(m_EEPROM),&dwRead,NULL);
}

void CEeprom::ReadFrom(BYTE * Buffer, int line)
{
	int i;
	
	if (m_hFile == NULL) 
	{
		LoadEeprom();
	}
	
	for (i=0; i < 8; i++) 
	{
		Buffer[i] = m_EEPROM[line*8+i]; 
	}
}

void CEeprom::WriteTo(BYTE * Buffer, int line)
{
	DWORD dwWritten;
	int i;

	if (m_hFile == NULL) 
	{
		LoadEeprom();
	}
	for (i=0;i<8;i++)
	{
		m_EEPROM[line*8+i]=Buffer[i];
	}
	SetFilePointer(m_hFile,line*8,NULL,FILE_BEGIN);	
	WriteFile( m_hFile,Buffer,8,&dwWritten,NULL );
	FlushFileBuffers(m_hFile);
}