#include <nds.h>
#include <nds/arm9/dldi.h>
#include <fat.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <stdio.h>

#include "main.h"
#include "dldi-include.h"
#include "lzss.h"
#include "ramd.h"
#include "ramdrive-include.h"
#include "tonccpy.h"

static sNDSHeader nds;

u8 stored_SCFG_MC = 0;

static bool slot1Enabled = true;

bool sdMounted = false;
bool sdMountedDone = false;				// true if SD mount is successful once
bool flashcardMounted = false;
bool ramdrive1Mounted = false;
bool ramdrive2Mounted = false;
bool nitroMounted = false;

int currentDrive = 0;						// 0 == SD card, 1 == Flashcard, 2 == RAMdrive 1, 3 == RAMdrive 2
int nitroCurrentDrive = 0;

char sdLabel[12];
char fatLabel[12];

u64 sdSize = 0;
u64 fatSize = 0;

static int getGbNumber(u64 bytes) {
	int gbNumber = 0;
	for (u64 i = 0; i <= bytes; i += 0x40000000) {
		gbNumber++;
	}
	return gbNumber;
}

static int getTbNumber(u64 bytes) {
	int tbNumber = 0;
	for (u64 i = 0; i <= bytes; i += 0x10000000000) {
		tbNumber++;
	}
	return tbNumber;
}

void printDriveBytes(u64 bytes)
{
	if (bytes == 1)
		iprintf("%d Byte", (int)bytes);

	else if (bytes >= 0 && bytes < 1024)
		iprintf("%d Bytes", (int)bytes);

	else if (bytes >= 1024 && bytes < (1024 * 1024))
		printf("%d KB", (int)bytes / 1024);

	else if (bytes >= (1024 * 1024) && bytes < (1024 * 1024 * 1024))
		printf("%d MB", (int)bytes / 1024 / 1024);

	else if (bytes >= 0x40000000 && bytes < 0x10000000000)
		printf("%d GB", getGbNumber(bytes));

	else
		printf("%d TB", getTbNumber(bytes));
}

const char* getDrivePath(void) {
	switch (currentDrive) {
		case 0:
			return "sd:/";
		case 1:
			return "fat:/";
		case 2:
			return "ram1:/";
		case 3:
			return "ram2:/";
	}
	return "";
}

void fixLabel(bool fat) {
	if (fat) {
		for (int i = 0; i < 12; i++) {
			if (((fatLabel[i] == ' ') && (fatLabel[i+1] == ' ') && (fatLabel[i+2] == ' '))
			|| ((fatLabel[i] == ' ') && (fatLabel[i+1] == ' '))
			|| (fatLabel[i] == ' ')) {
				fatLabel[i] = '\0';
				break;
			}
		}
	} else {
		for (int i = 0; i < 12; i++) {
			if (((sdLabel[i] == ' ') && (sdLabel[i+1] == ' ') && (sdLabel[i+2] == ' '))
			|| ((sdLabel[i] == ' ') && (sdLabel[i+1] == ' '))
			|| (sdLabel[i] == ' ')) {
				sdLabel[i] = '\0';
				break;
			}
		}
	}
}

bool sdFound(void) {
	if (access("sd:/", F_OK) == 0) {
		return true;
	} else {
		return false;
	}
}

bool flashcardFound(void) {
	if (access("fat:/", F_OK) == 0) {
		return true;
	} else {
		return false;
	}
}

bool bothSDandFlashcard(void) {
	if (sdMounted && flashcardMounted) {
		return true;
	} else {
		return false;
	}
}

TWL_CODE bool sdMount(void) {
	fatMountSimple("sd", get_io_dsisd());
	if (sdFound()) {
		sdMountedDone = true;
		fatGetVolumeLabel("sd", sdLabel);
		fixLabel(false);
		struct statvfs st;
		if (statvfs("sd:/", &st) == 0) {
			sdSize = st.f_bsize * st.f_blocks;
		}
		return true;
	}
	return false;
}

TWL_CODE void sdUnmount(void) {
	fatUnmount("sd");
	sdLabel[0] = '\0';
	sdSize = 0;
	sdMounted = false;
}

TWL_CODE DLDI_INTERFACE* dldiLoadFromBin (const u8 dldiAddr[]) {
	// Check that it is a valid DLDI
	if (!dldiIsValid ((DLDI_INTERFACE*)dldiAddr)) {
		return NULL;
	}

	DLDI_INTERFACE* device = (DLDI_INTERFACE*)dldiAddr;
	size_t dldiSize;

	// Calculate actual size of DLDI
	// Although the file may only go to the dldiEnd, the BSS section can extend past that
	if (device->dldiEnd > device->bssEnd) {
		dldiSize = (char*)device->dldiEnd - (char*)device->dldiStart;
	} else {
		dldiSize = (char*)device->bssEnd - (char*)device->dldiStart;
	}
	dldiSize = (dldiSize + 0x03) & ~0x03; 		// Round up to nearest integer multiple
	
	// Clear unused space
	toncset(device+dldiSize, 0, 0x4000-dldiSize);

	dldiFixDriverAddresses (device);

	if (device->ioInterface.features & FEATURE_SLOT_GBA) {
		sysSetCartOwner(BUS_OWNER_ARM9);
	}
	if (device->ioInterface.features & FEATURE_SLOT_NDS) {
		sysSetCardOwner(BUS_OWNER_ARM9);
	}
	
	return device;
}

TWL_CODE bool UpdateCardInfo(char* gameid, char* gamename) {
	cardReadHeader((uint8*)0x02000000);
	tonccpy(&nds, (void*)0x02000000, sizeof(sNDSHeader));
	tonccpy(gameid, &nds.gameCode, 4);
	gameid[4] = 0x00;
	tonccpy(gamename, &nds.gameTitle, 12);
	gamename[12] = 0x00;
	return true;
}

TWL_CODE void ShowGameInfo(const char gameid[], const char gamename[]) {
	iprintf("Game id: %s\nName:    %s", gameid, gamename);
}

TWL_CODE bool twl_flashcardMount(void) {
	if (REG_SCFG_MC != 0x11) {
		sysSetCardOwner (BUS_OWNER_ARM9);

		// Reset Slot-1 to allow reading title name and ID
		if (slot1Enabled) {
			disableSlot1();
			for(int i = 0; i < 25; i++) { swiWaitForVBlank(); }
			slot1Enabled = false;
		}
		if (appInited) {
			for(int i = 0; i < 35; i++) { swiWaitForVBlank(); }	// Make sure cart is inserted correctly
		}
		if (REG_SCFG_MC == 0x11) {
			sysSetCardOwner (BUS_OWNER_ARM7);
			return false;
		}
		if (!slot1Enabled) {
			enableSlot1();
			for(int i = 0; i < 15; i++) { swiWaitForVBlank(); }
			slot1Enabled = true;
		}

		nds.gameCode[0] = 0;
		nds.gameTitle[0] = 0;
		char gamename[13];
		char gameid[5];

		/*fifoSendValue32(FIFO_USER_04, 1);
		for (int i = 0; i < 10; i++) {
			swiWaitForVBlank();
		}
		tonccpy(&nds, (void*)0x02000000, sizeof(nds));*/
		UpdateCardInfo(&gameid[0], &gamename[0]);

		/*consoleClear();
		iprintf("REG_SCFG_MC: %x\n", REG_SCFG_MC);
		ShowGameInfo(gameid, gamename);

		for (int i = 0; i < 60*5; i++) {
			swiWaitForVBlank();
		}*/

		sysSetCardOwner (BUS_OWNER_ARM7);	// 3DS fix

		if (gameid[0] >= 0x00 && gameid[0] < 0x20) {
			return false;
		}

		// Read a DLDI driver specific to the cart
		if (!memcmp(gameid, "ASMA", 4)) {
			io_dldi_data = dldiLoadFromBin(r4tf_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface);      
		} else if (!memcmp(gamename, "TOP TF/SD DS", 12) || !memcmp(gameid, "A76E", 4)) {
			io_dldi_data = dldiLoadFromBin(tt_sd_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface);
 		} else /*if (!memcmp(gamename, "PASS", 4) && !memcmp(gameid, "ASME", 4)) {
			io_dldi_data = dldiLoadFromBin(CycloEvo_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface);
		} else*/ if (!memcmp(gamename, "D!S!XTREME", 12) && !memcmp(gameid, "AYIE", 4)) {
			io_dldi_data = dldiLoadFromBin(dsx_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface); 
        } else if (!memcmp(gamename, "QMATETRIAL", 9) || !memcmp(gamename, "R4DSULTRA", 9)) {
			io_dldi_data = dldiLoadFromBin(r4idsn_sd_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface);
		} else if (!memcmp(gameid, "ACEK", 4) || !memcmp(gameid, "YCEP", 4) || !memcmp(gameid, "AHZH", 4) || !memcmp(gameid, "CHPJ", 4)) {
			io_dldi_data = dldiLoadFromBin(ak2_sd_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface);
		} /*else if (!memcmp(gameid, "ALXX", 4)) {
			io_dldi_data = dldiLoadFromBin(dstwo_dldi);
			fatMountSimple("fat", &io_dldi_data->ioInterface);
		}*/

		if (flashcardFound()) {
			fatGetVolumeLabel("fat", fatLabel);
			fixLabel(true);
			struct statvfs st;
			if (statvfs("fat:/", &st) == 0) {
				fatSize = st.f_bsize * st.f_blocks;
			}
			return true;
		}
	}
	return false;
}

bool flashcardMount(void) {
	if (!isDSiMode() || (arm7SCFGLocked && !sdMountedDone)) {
		fatInitDefault();
		if (flashcardFound()) {
			fatGetVolumeLabel("fat", fatLabel);
			fixLabel(true);
			struct statvfs st;
			if (statvfs("fat:/", &st) == 0) {
				fatSize = st.f_bsize * st.f_blocks;
			}
			return true;
		}
		return false;
	} else {
		return twl_flashcardMount();
	}
}

void flashcardUnmount(void) {
	fatUnmount("fat");
	fatLabel[0] = '\0';
	fatSize = 0;
	flashcardMounted = false;
}

TWL_CODE void ramdrive1Mount(void) {
	LZ77_Decompress((u8*)__9MB_lz77, (u8*)0x02500000);
	fatMountSimple("ram1", &io_ram_drive);
	ramdrive1Mounted = (access("ram1:/", F_OK) == 0);
}

TWL_CODE void ramdrive2Mount(void) {
	LZ77_Decompress((u8*)__16MB_lz77, (u8*)0x0D000000);
	fatMountSimple("ram2", &io_ram_drive2);
	ramdrive2Mounted = (access("ram2:/", F_OK) == 0);
}