/*
 * savegame_manager: a tool to backup and restore savegames from Nintendo
 *  DS cartridges. Nintendo DS and all derivative names are trademarks
 *  by Nintendo. EZFlash 3-in-1 is a trademark by EZFlash.
 *
 * main.cpp: main file
 *
 * Copyright (C) Pokedoc (2010)
 */
/* 
 * This program 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 2 of the License, or 
 * (at your option) any later version.
 * 
 * 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 <nds.h>
#include <fat.h>
#include <nds/arm9/dldi.h>

#include <sys/dir.h>
#include <nds/arm9/console.h>

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <math.h>

#include <dirent.h>

#include <algorithm>

#include "gba.h"
#include "dsi.h"
#include "display.h"
#include "dsCard.h"
#include "hardware.h"
#include "fileselect.h"
#include "strings.h"

#include "libini.h"

#include "globals.h"

using std::max;


char bootdir[256] = "/";


#define LIBNDS_VER ((_LIBNDS_MAJOR_ << 16) | (_LIBNDS_MINOR_ << 8) | (_LIBNDS_PATCH_))

// needs libnds version 1.5.4, for the SDHC driver on the DSi.
#if (LIBNDS_VER < 0x00010504)
#error "Your libnds version is outdated! Please use 1.5.4 or higher!"
#endif


#define REBOOT_WIFI


// ============================================================================
void mode_dsi()
{
	// TODO: test is SD card is present!

	// use 3in1 to buffer data
	displayStateF(STR_EMPTY);
	displayPrintUpper(true);
	displayPrintLower();
	
	// DSi mode, does nothing at the moment
	displayMessageF(STR_BOOT_MODE_UNSUPPORTED);

	touchPosition touchXY;
	while(1) {
		swiWaitForVBlank();
		touchRead(&touchXY);
		
		// backup
		if ((touchXY.py > 8*0) && (touchXY.py < 8*8)) {
			hwBackupDSi();
		}
		
		// restore
		if ((touchXY.py > 8*8) && (touchXY.py < 8*16)) {
			hwRestoreDSi();
		}
		
		// erase
		if ((touchXY.py > 8*16) && (touchXY.py < 8*24)) {
			//swap_cart();
			//displayPrintUpper();
			//hwErase();
		}
	}
}

void mode_slot2()
{
	// use slot2 DLDI device to store data
	displayStateF(STR_EMPTY);
	displayPrintUpper(true);
	displayPrintLower();
	
	touchPosition touchXY;
	while(1) {
		swiWaitForVBlank();
		touchRead(&touchXY);
		
		// backup
		if ((touchXY.py > 8*0) && (touchXY.py < 8*8)) {
			hwBackupSlot2();
			displayPrintLower();
		}
		
		// restore
		if ((touchXY.py > 8*8) && (touchXY.py < 8*16)) {
			hwRestoreSlot2();
			displayPrintLower();
		}
		
		// erase
		if ((touchXY.py > 8*16) && (touchXY.py < 8*24)) {
			swap_cart();
			displayPrintUpper();
			hwErase();
			displayPrintLower();
		}
	}
}

void mode_3in1()
{
	displayPrintUpper(true);
	
	dsCardData data2;
	uint32 ime = hwGrab3in1();
	ReadNorFlash(data, 0, 0x8000);
	hwRelease3in1(ime);
	memcpy(&data2, &data[0x1000], sizeof(data2));
	if ((data2.data[0] == RS_BACKUP) && (data2.data[1] == 0) && (data2.data[3] == 0xffff00ff)) {
		uint32 size = data2.data[2];
		char name[13];
		memcpy(&name[0], &data2.name[0], 12);
		name[12] = 0;
		displayMessageF(STR_HW_3IN1_CLEAR_FLAG); // lower screen is used for file browser
		hwFormatNor(0, 1); // clear reboot flag
		hwDump3in1(size, name);
	}
	displayMessageF(STR_EMPTY);
	displayProgressBar(0,0);
	displayPrintLower();
	
	touchPosition touchXY;
	while(1) {
		swiWaitForVBlank();
		touchRead(&touchXY);
		
		// backup
		if ((touchXY.py > 8*0) && (touchXY.py < 8*8)) {
			hwBackup3in1();
		}
		
		// restore
		if ((touchXY.py > 8*8) && (touchXY.py < 8*16)) {
			hwRestore3in1();
		}
		
		// erase
		if ((touchXY.py > 8*16) && (touchXY.py < 8*24)) {
			swap_cart();
			displayPrintUpper();
			hwErase();
			displayPrintLower();
		}
	}
}

void mode_gba()
{
	// This function takes some time, since it needs to parse the entire GBA module
	//  for a magic string. It is only called when truly necessary. (i.e. once for now)
	u8 gbatype = gbaGetSaveType();
	
	// use 3in1 to buffer data
	displayStateF(STR_EMPTY);
	gbatype = gbaGetSaveType();
	displayPrintUpper(true);
	displayPrintLower();

	touchPosition touchXY;
	while(1) {
		swiWaitForVBlank();
		touchRead(&touchXY);
		
		// backup
		if ((touchXY.py > 8*0) && (touchXY.py < 8*8)) {
			displayPrintUpper();
			hwBackupGBA(gbatype);
			displayPrintLower();
		}
		
		// restore
		if ((touchXY.py > 8*8) && (touchXY.py < 8*16)) {
			displayPrintUpper();
			hwRestoreGBA();
			displayPrintLower();
		}
		
		// erase
		if ((touchXY.py > 8*16) && (touchXY.py < 8*24)) {
			displayPrintUpper();
			hwEraseGBA();
			displayPrintLower();
		}
	}
}

void mode_wifi()
{
	//displayStateF(STR_EMPTY);
	displayPrintUpper(true);
	displayPrintLower();
	
	touchPosition touchXY;
	while(1) {
		swiWaitForVBlank();
		touchRead(&touchXY);
		
		// backup
		if ((touchXY.py > 8*0) && (touchXY.py < 8*8)) {
			hwBackupFTP();
#ifdef REBOOT_WIFI
			displayMessage2F(STR_HW_PLEASE_REBOOT);
			while(1);
#endif
			displayPrintLower();
		}
		
		// restore
		if ((touchXY.py > 8*8) && (touchXY.py < 8*16)) {
			hwRestoreFTP();
#ifdef REBOOT_WIFI
			displayMessage2F(STR_HW_PLEASE_REBOOT);
			while(1);
#endif
			displayPrintLower();
		}
		
		// erase
		if ((touchXY.py > 8*16) && (touchXY.py < 8*24)) {
			swap_cart();
			displayPrintUpper();
			hwErase();
			displayPrintLower();
		}
	}
}

void mode_dlp()
{
	// use non-flash card based exploits (download play or Sudoku?). untested, and does not work yet!
	displayStateF(STR_EMPTY);
	displayPrintUpper();
	displayPrintLower();
	
	// DSi mode, does nothing at the moment
	displayMessage2F(STR_STR, "I did not expect that you can trigger this mode at all!");
	while(1);

	touchPosition touchXY;
	while(1) {
		swiWaitForVBlank();
		touchRead(&touchXY);
		
		// backup
		if ((touchXY.py > 8*0) && (touchXY.py < 8*8)) {
			hwBackupFTP(true);
		}
		
		// restore
		if ((touchXY.py > 8*8) && (touchXY.py < 8*16)) {
			hwRestoreFTP(true);
		}
		
		// erase
		if ((touchXY.py > 8*16) && (touchXY.py < 8*24)) {
			displayPrintUpper();
			hwErase();
			displayWarning2F(STR_HW_DID_DELETE);
			while(1);
		}
	}
}

bool loadIniFile(char* path)
{
	// Don't try to load ini file in DLP mode, we need to get our options from a different source.
	//  Still trying to figure something out...
	if (mode == 5)
		return true;

	ini_fd_t ini = 0;
	
	// load ini file...
	char inipath[256];
	if (path) {
		char *last = strrchr(path, '/');
		int len = (last - path)+1;
		strncpy(bootdir, path, len);
		sprintf(inipath, "%s/savegame_manager.ini", bootdir);
		if (fileExists(inipath))
			ini = ini_open(inipath, "r", "");
	}
	if (!ini) {
		sprintf(inipath, "/savegame_manager.ini");
		if (fileExists(inipath))
			ini = ini_open(inipath, "r", "");
	}
	if (!ini) {
		//displayWarning2F(STR_BOOT_NO_INI);
		iprintf("could not find ini file!");
		while (1);
	}
	
#ifdef DEBUG
	iprintf("Found and parsed INI file.\n");
#endif
	
	ini_locateHeading(ini, "");
	ini_locateKey(ini, "ftp_ip");
	ini_readString(ini, ftp_ip, 16);
	ini_locateKey(ini, "ftp_user");
	ini_readString(ini, ftp_user, 64);
	ini_locateKey(ini, "ftp_pass");
	ini_readString(ini, ftp_pass, 64);
	ini_locateKey(ini, "ftp_port");
	ini_readInt(ini, &ftp_port);
	
	ini_locateKey(ini, "ir_delay");	
	ini_readInt(ini, &ir_delay);
	ir_delay = max(ir_delay, 1000);
	
	if (ini_locateKey(ini, "slot2"))
		ini_readInt(ini, &slot2);

	// load additional Flash chip signatures (JEDEC IDs)
	ini_locateHeading(ini, "new chips");
	for (int i = 0; i < EXTRA_ARRAY_SIZE; i++) {
		int tmp;
		sprintf(txt, "%i-id", i);
		ini_locateKey(ini, txt);
		ini_readString(ini, txt, 256);
		sscanf(txt, "%x", &tmp);
		extra_id[i] = (u32)tmp;
		//
		sprintf(txt, "%i-size", i);
		ini_locateKey(ini, txt);
		ini_readInt(ini, &tmp);
		extra_size[i] = tmp;
	}

	txt[0] = 0;
	ini_locateHeading(ini, "");
	ini_locateKey(ini, "language");
	ini_readString(ini, txt, 256);
	
	ini_close(ini);
	
	// delete temp file (which is a remnant of inilib)
	remove("/tmpfile");
	
	return true;
}

// This is a new attempt to reliably identify if the flash card has argv support or not,
//  including R4 clones which may have *bad* argv support.
bool has_argv(int argc, char* argv[])
{
	// no argv support
	if (argc == 0)
		return false;
	
	// bad argv support: if argc is larger than unity, your flash card can't even do
	//  a proper negative indicator. let us test for 2 argv arguments, just to be safe.
	if (argc > 2)
		return false;
	
	/*
	// test if argv[0] pointer is valid (scan main memory and WRAM)
	if ((argv[0] < 0x02000000) || (argv[0] >= 0x04000000))
		return false;
	*/
	
	// test if argv[0] contains a valid string
	char *arg0 = argv[0];
	// test for possible "/path", "fat*:/path" and "sd:/*".
	if (*arg0 == 'f')
		if (!strncasecmp(argv[0], "fat:/", 5) || !strncasecmp(argv[0], "fat1:/", 6)
			|| !strncasecmp(argv[0], "fat2:/", 6))
			return true;

	if (*arg0 == 's')
		if (!strncasecmp(argv[0], "sd:/", 4)) {
			sdslot = true; // for sudokuhax
			return true;
		}
	
	if (*arg0 == '/')
		return true;
	
	return false;
}

int main(int argc, char* argv[])
{
	sysSetBusOwners(true, true);
	
	// Init the screens
	displayInit();

	// Init DLDI (file system driver)
	sysSetBusOwners(true, true);
	int fat = fatInitDefault();
	if (fat == 0) {
		//displayWarning2F(STR_BOOT_DLDI_ERROR);
		iprintf("DLDI error");
		while (1);
	}
#ifdef DEBUG
	iprintf("Found DLDI: %s\n", io_dldi_data->friendlyName);
#endif
	
	// detect hardware
	mode = hwDetect();
	
	// Load the ini file with the FTP settings and more options
	for (int i = 0; i < EXTRA_ARRAY_SIZE; i++) {
		extra_id[i] = 0xff000000;
		extra_size[i] = 0;
	}
#ifdef DEBUG
	iprintf("Loading INI file\n");
#endif
	if (has_argv(argc, argv)) {
#ifdef DEBUG
		iprintf("argv folder: %s\n", argv[0]);
#endif
		loadIniFile(argv[0]);
	} else {
#ifdef DEBUG
		iprintf("Bad/no argv folder!\n", argv[0]);
#endif
		loadIniFile(0);
	}
#ifdef DEBUG
	iprintf("Done!\n");
#endif
	
	if (slot2 > 0)
		mode = 4;

	// load strings
	// "txt" is used as a temp buffer for the language file name, returned by hwDetect
	stringsLoadFile(txt);

	// prepare the global data buffer
	data = (u8*)malloc(size_buf);
	// On my Cyclops, no 2MB buffer is available after loading strings! bad memory management?
	//  Anyway, we can't do anything except for the following (which restricts the usefulness
	//  of FTP safe mode)
#ifdef DEBUG
	iprintf("Allocating memory buffer.\n");
#endif
	while (data == NULL) {
		size_buf >>= 1;
		data = (u8*)malloc(size_buf);
	}
#ifdef DEBUG
	iprintf("Done! We now have %x.\n", size_buf);
#endif
	
	// Init the screens
	displayTitle();

	// okay, we got our HW identified; now branch to the corresponding main function/event handler
	switch (mode) {
		case 1:
			mode_gba();
			break;
		case 2:
			mode_3in1();
			break;
		case 3:
			mode_dsi();
			break;
		case 4:
			mode_slot2();
			break;
		case 5:
			mode_dlp();
			break;
		default:
			mode_wifi();
	}

	return 0;
}