/****************************************************************************
 * FCE Ultra 0.98.12
 * Nintendo Wii/Gamecube Port
 *
 * Tantric September 2008
 *
 * fileop.c
 *
 * File operations
 ****************************************************************************/

#include <gccore.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ogcsys.h>
#include <zlib.h>

#include "common.h"
#include "fceuconfig.h"
#include "fileop.h"
#include "gcunzip.h"
#include "menudraw.h"
#include "filesel.h"

// FAT file pointer - the only one we should ever use!
FILE * fatfile;

/****************************************************************************
 * UnmountFAT
 * Unmounts the FAT device specified
 ***************************************************************************/
void UnmountFAT(PARTITION_INTERFACE part)
{
	if(!fatUnmount(part))
		fatUnsafeUnmount(part);
}

/****************************************************************************
 * UnmountAllFAT
 * Unmounts all FAT devices
 ***************************************************************************/
void UnmountAllFAT()
{
#ifdef HW_RVL
	UnmountFAT(PI_INTERNAL_SD);
	UnmountFAT(PI_USBSTORAGE);
#endif
	UnmountFAT(PI_SDGECKO_A);
	UnmountFAT(PI_SDGECKO_B);
}

/****************************************************************************
 * MountFAT
 * Checks if the device needs to be (re)mounted
 * If so, unmounts the device
 * Attempts to mount the device specified
 * Sets libfat to use the device by default
 * Enables read-ahead cache for SD/USB
 ***************************************************************************/
bool MountFAT(PARTITION_INTERFACE part)
{
	UnmountFAT(part);

	bool mounted = fatMountNormalInterface(part, 8);

	if(mounted)
	{
		fatSetDefaultInterface(part);
		#ifdef HW_RVL
		if(part == PI_INTERNAL_SD || part == PI_USBSTORAGE)
			fatEnableReadAhead (part, 6, 64);
		#endif
	}
	return mounted;
}

/****************************************************************************
 * ChangeFATInterface
 * Unmounts all devices and attempts to mount/configure the device specified
 ***************************************************************************/
bool ChangeFATInterface(int method, bool silent)
{
	bool mounted = false;

	if(method == METHOD_SD)
	{
		#ifdef HW_RVL
		mounted = MountFAT(PI_INTERNAL_SD); // try Wii internal SD
		#endif

		if(!mounted) // internal SD not found
			mounted = MountFAT(PI_SDGECKO_A); // try SD Gecko on slot A
		if(!mounted) // internal SD and SD Gecko (on slot A) not found
			mounted = MountFAT(PI_SDGECKO_B); // try SD Gecko on slot B
		if(!mounted && !silent) // no SD device found
			WaitPrompt ((char *)"SD card not found!");
	}
	else if(method == METHOD_USB)
	{
		#ifdef HW_RVL
		mounted = MountFAT(PI_USBSTORAGE);

		if(!mounted && !silent)
			WaitPrompt ((char *)"USB drive not found!");
		#endif
	}

	return mounted;
}

/***************************************************************************
 * Browse FAT subdirectories
 **************************************************************************/
int
ParseFATdirectory(int method)
{
	int nbfiles = 0;
	DIR_ITER *fatdir;
	char filename[MAXPATHLEN];
	struct stat filestat;
	char msg[128];

	// initialize selection
	selection = offset = 0;

	// Clear any existing values
	memset (&filelist, 0, sizeof (FILEENTRIES) * MAXFILES);

	// open the directory
	fatdir = diropen(currentdir);
	if (fatdir == NULL)
	{
		sprintf(msg, "Couldn't open %s", currentdir);
		WaitPrompt(msg);

		// if we can't open the dir, open root dir
		sprintf(currentdir,"%s",ROOTFATDIR);

		fatdir = diropen(currentdir);

		if (fatdir == NULL)
		{
			sprintf(msg, "Error opening %s", currentdir);
			WaitPrompt(msg);
			return 0;
		}
	}

	// index files/folders
	while(dirnext(fatdir,filename,&filestat) == 0)
	{
		if(strcmp(filename,".") != 0)
		{
			memset(&filelist[nbfiles], 0, sizeof(FILEENTRIES));
			strncpy(filelist[nbfiles].filename, filename, MAXPATHLEN);
			strncpy(filelist[nbfiles].displayname, filename, MAXDISPLAY+1);	// crop name for display
			filelist[nbfiles].length = filestat.st_size;
			filelist[nbfiles].flags = (filestat.st_mode & _IFDIR) == 0 ? 0 : 1; // flag this as a dir
			nbfiles++;
		}
	}

	// close directory
	dirclose(fatdir);

	// Sort the file list
	qsort(filelist, nbfiles, sizeof(FILEENTRIES), FileSortCallback);

	return nbfiles;
}

/****************************************************************************
 * LoadFATSzFile
 * Loads the selected file # from the specified 7z into rbuffer
 * Returns file size
 ***************************************************************************/
int
LoadFATSzFile(char * filepath, unsigned char * rbuffer)
{
	u32 size;
	fatfile = fopen (filepath, "rb");
	if (fatfile > 0)
	{
		size = SzExtractFile(filelist[selection].offset, rbuffer);
		fclose (fatfile);
		return size;
	}
	else
	{
		WaitPrompt((char*) "Error opening file");
		return 0;
	}
}

/****************************************************************************
 * LoadFATFile
 ***************************************************************************/
int
LoadFATFile (char * rbuffer, char *filepath, int length, bool silent)
{
	char zipbuffer[2048];
	int size = 0;
	int readsize = 0;

	fatfile = fopen (filepath, "rb");

	if (fatfile > 0)
	{
		if(length > 0 && length <= 2048) // do a partial read (eg: to check file header)
		{
			fread (rbuffer, 1, length, fatfile);
			size = length;
		}
		else // load whole file
		{
			readsize = fread (zipbuffer, 1, 2048, fatfile);

			if(readsize > 0)
			{
				if (IsZipFile (zipbuffer))
				{
					size = UnZipBuffer ((unsigned char *)rbuffer, METHOD_SD);	// unzip from FAT
				}
				else
				{
					// Just load the file up
					fseek(fatfile, 0, SEEK_END); // go to end of file
					size = ftell(fatfile); // get filesize
					fseek(fatfile, 0, SEEK_SET); // go to start of file
					fread (rbuffer, 1, size, fatfile);
				}
			}
		}
		fclose (fatfile);
		return size;
	}
	else
	{
		if(!silent)
			WaitPrompt((char*) "Error opening file!");
		return 0;
	}
}

/****************************************************************************
 * SaveFATFile
 * Write buffer to FAT card file
 ***************************************************************************/
int
SaveFATFile (char * buffer, char *filepath, int datasize, bool silent)
{
	if (datasize)
    {
        fatfile = fopen (filepath, "wb");

        if (fatfile <= 0)
        {
            char msg[100];
            sprintf(msg, "Couldn't save %s", filepath);
            WaitPrompt (msg);
            return 0;
        }

        fwrite (savebuffer, 1, datasize, fatfile);
        fclose (fatfile);
    }
    return datasize;
}