/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.org/license.html
 */

/**
 * @file    src/gfile/gfile.c
 * @brief   GFILE code.
 *
 */

#define GFILE_IMPLEMENTATION
#include "gfx.h"

#if GFX_USE_GFILE

// The chain of FileSystems
#define GFILE_CHAINHEAD		0

// The table of GFILE's
static GFILE gfileArr[GFILE_MAX_GFILES];
GFILE *gfileStdIn;
GFILE *gfileStdOut;
GFILE *gfileStdErr;

/**
 * The order of the file-systems below determines the order
 * that they are searched to find a file.
 * The last defined is the first searched.
 */

/********************************************************
 * The RAM file-system VMT
 ********************************************************/
#if GFILE_NEED_RAMFS
	#include "../src/gfile/inc_ramfs.c"
#endif

/********************************************************
 * The FAT file-system VMT
 ********************************************************/
#ifndef GFILE_NEED_FATFS
	#include "../src/gfile/inc_fatfs.c"
#endif

/********************************************************
 * The native file-system
 ********************************************************/
#if GFILE_NEED_NATIVEFS
	#include "../src/gfile/inc_nativefs.c"
#endif

/********************************************************
 * The ROM file-system VMT
 ********************************************************/
#if GFILE_NEED_ROMFS
	#include "../src/gfile/inc_romfs.c"
#endif

/********************************************************
 * IO routines
 ********************************************************/

/**
 * The chain of file systems.
 */
static const GFILEVMT const * FsChain = GFILE_CHAINHEAD;

/**
 * The init routine
 */
void _gfileInit(void) {
	#if GFILE_NEED_NATIVEFS
		NativeStdIn.flags = GFILEFLG_OPEN|GFILEFLG_READ;
		NativeStdIn.vmt = &FsNativeVMT;
		NativeStdIn.obj = (void *)stdin;
		NativeStdIn.pos = 0;
		gfileStdIn = &NativeStdIn;
		NativeStdOut.flags = GFILEFLG_OPEN|GFILEFLG_WRITE|GFILEFLG_APPEND;
		NativeStdOut.vmt = &FsNativeVMT;
		NativeStdOut.obj = (void *)stdout;
		NativeStdOut.pos = 0;
		gfileStdOut = &NativeStdOut;
		NativeStdErr.flags = GFILEFLG_OPEN|GFILEFLG_WRITE|GFILEFLG_APPEND;
		NativeStdErr.vmt = &FsNativeVMT;
		NativeStdErr.obj = (void *)stderr;
		NativeStdErr.pos = 0;
		gfileStdErr = &NativeStdErr;
	#endif
}

bool_t	gfileExists(const char *fname) {
	const GFILEVMT *p;

	if (fname[0] && fname[1] == '|') {
		for(p = FsChain; p; p = p->next) {
			if (p->prefix == fname[0])
				return p->exists && p->exists(fname+2);
		}
	} else {
		for(p = FsChain; p; p = p->next) {
			if (p->exists && p->exists(fname))
				return TRUE;
		}
	}
	return FALSE;
}

bool_t	gfileDelete(const char *fname) {
	const GFILEVMT *p;

	if (fname[0] && fname[1] == '|') {
		for(p = FsChain; p; p = p->next) {
			if (p->prefix == fname[0])
				return p->del && p->del(fname+2);
		}
	} else {
		for(p = FsChain; p; p = p->next) {
			if (p->del && p->del(fname))
				return TRUE;
		}
	}
	return FALSE;
}

long int gfileGetFilesize(const char *fname) {
	const GFILEVMT *p;

	if (fname[0] && fname[1] == '|') {
		for(p = FsChain; p; p = p->next) {
			if (p->prefix == fname[0])
				return p->filesize ? p->filesize(fname+2) : -1;
		}
	} else {
		long int res;

		for(p = FsChain; p; p = p->next) {
			if (p->filesize && (res = p->filesize(fname)) != -1)
				return res;
		}
	}
	return -1;
}

bool_t	gfileRename(const char *oldname, const char *newname) {
	const GFILEVMT *p;

	if ((oldname[0] && oldname[1] == '|') || (newname[0] && newname[1])) {
		char ch;

		if (oldname[0] && oldname[1] == '|') {
			ch = oldname[0];
			oldname += 2;
			if (newname[0] && newname[1] == '|') {
				if (newname[0] != ch)
					return FALSE;
				newname += 2;
			}
		} else {
			ch = newname[0];
			newname += 2;
		}
		for(p = FsChain; p; p = p->next) {
			if (p->prefix == ch)
				return p->ren && p->ren(oldname, newname);
		}
	} else {
		for(p = FsChain; p; p = p->next) {
			if (p->ren && p->ren(oldname,newname))
				return TRUE;
		}
	}
	return FALSE;
}

GFILE *gfileOpen(const char *fname, const char *mode) {

}

void gfileClose(GFILE *f) {

}

size_t	gfileRead(GFILE *f, char *buf, size_t len) {

}

size_t	gfileWrite(GFILE *f, const char *buf, size_t len) {

}

long int	gfileGetPos(GFILE *f) {

}

bool_t gfileSetPos(GFILE *f, long int pos) {

}

long int	gfileGetSize(GFILE *f) {

}

/********************************************************
 * printg routines
 ********************************************************/
#if GFILE_NEED_PRINTG
#endif

/********************************************************
 * scang routines
 ********************************************************/
#if GFILE_NEED_SCANG
#endif

/********************************************************
 * stdio emulation routines
 ********************************************************/
#ifndef GFILE_NEED_STDIO
	#define GFILE_NEED_STDIO		FALSE
#endif

#endif /* GFX_USE_GFILE */