/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

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 permitted provided that the following conditions are met:

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 form must reproduce the above copyright notice, this list of conditions, the following
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 contributors may be used to endorse or promote products derived from this software
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 $Id: ubixfs.c 79 2016-01-11 16:21:27Z reddawg $

 *****************************************************************************************/

#include <vfs/vfs.h>
#include <ubixos/sched.h>
#include <ubixos/kpanic.h>
#include <ubixos/exec.h>
#include <lib/kmalloc.h>
#include <string.h>
#include <lib/kprintf.h>
#include <assert.h>

#include "fat_filelib.h"
#include "fat_access.h"

fileDescriptor_t *_fd;
struct vfs_mountPoint *_mp;

int media_read(unsigned long sector, unsigned char *buffer, unsigned long sector_count) {
  _mp->device->devInfo->read(_mp->device->devInfo->info, buffer, sector, sector_count);

  return 1;
}

int media_write(unsigned long sector, unsigned char *buffer, unsigned long sector_count) {
  _mp->device->devInfo->write(_mp->device->devInfo->info, buffer, sector, sector_count);

  return 1;
}

int fat_initialize(struct vfs_mountPoint *mp) {
  FL_FILE *file;
  _mp = mp;

  // Attach media access functions to library
  if (fl_attach_media(media_read, media_write) != FAT_INIT_OK) {
    kprintf("ERROR: Media attach failed\n");
    return (0);
  }

  // List root directory
  //fl_listdirectory("/bin/");

  // Delete File
  //if (fl_remove("/file.bin") < 0)
  //  kprintf("ERROR: Delete file failed\n");

  // Create File
  file = fl_fopen("/file.bin", "w");
  unsigned char data[] = {
      'a',
      '\n',
      'b',
      '\n',
      'c',
      '\n' };
  if (file) {
    // Write some data
    if (fl_fwrite(data, 1, sizeof(data), file) != sizeof(data))
      kprintf("ERROR: Write file failed\n");
  }
  else
    kprintf("ERROR: Create file failed\n");

  // Close file
  fl_fclose(file);

  return (1);
}

int read_fat(fileDescriptor_t *fd, char *data, off_t offset, long size) {
  FL_FILE *_file = (FL_FILE*) fd->res;

  if (size == 0) {
    kprintf("ZERO: %s", _file->filename);

        return (0);
  }

  //kprintf("[Offset(%s): %ld:%ld]", _file->filename, offset, size);
  if (fl_fseek(_file, offset & 0xFFFFFFFF, 0) != 0)
    kprintf("SEEK FAILED!");

  size = fl_fread(data, size, 1, _file);
    if (size > 0)
        fd->offset += size;
    /*
    else
        kprintf("[%s:%i] read_fat(0) FAILED!");
     */

  /* Return */
  return (size);
}

int write_fat(fileDescriptor_t *fd, char *data, off_t offset, long size) {
  FL_FILE *_file = (FL_FILE*) fd->res;

  kprintf("Writing: %i[%i]\n", size, offset);
  // XXX this is not supposed to happen fl_fseek(_file, offset, 0);

  if (fl_fwrite(data, 1, size, _file) != size)
    kprintf("ERROR: Write file failed\n");

  kprintf("Wrote: %i\n", size);

  /* Return */
  return (size);
}

int open_fat(const char *file, fileDescriptor_t *fd) {
  FL_FILE	*_file	= 0x0;
  FL_DIR	*_dir	= 0x0;

  assert(fd);
  assert(fd->mp);
  assert(fd->mp->device);
  assert(fd->mp->device->devInfo);
  assert(fd->mp->device->devInfo->read);
  assert(file);

    //kprintf("File: %s, ", file);
  //kprintf("Mode: 0x%X\n", fd->mode);

  if ((fd->mode & 0x1) == 0x1) {
    _file = fl_fopen(file, "r");
  }
  else if ((fd->mode & 0x2) == 0x2) {
    if ((fd->mode & 0x8) == 0x8) {
      _file = fl_fopen(file, "a");
    }
    else {
      _file = fl_fopen(file, "w");
    }
  }
  else
    kprintf("Invalid Mode?");

  if (!_file) {


	  // XXX - need to handle opening folders with open to figure out why LS isn't working.
	  /*
	  kprintf( "Not a File Test if Directory?\n" );

	  _dir	= kmalloc( sizeof( FL_DIR ) );

	  fl_opendir(file, _dir);


	  fd->offset	= 0;
	  fd->res		= _dir;
	  fd->perms		= 0x1;
	  fd->size		= 0x0;
	  fd->ino		= 0x0;

	  return( 0x1 );
	  */

    return (0x0);
  }
  else {
    fd->offset = 0;
    fd->res = _file;
    fd->perms = 0x1;
    fd->size = _file->filelength;
    fd->ino = _file->startcluster;
  }

  return (0x1);
}

int unlink_fat() {
    kprintf("[%s:%i] unlink_fat");
  return (0);
}

int mkdir_fat() {
    kprintf("[%s:%i] mkdir_fat");
  return (0);
}

int fat_init() {
  // Initialise File IO Library
  fl_init();

  /* Set up our file system structure */
  struct fileSystem ubixFileSystem = {
      NULL, /* prev        */
      NULL, /* next        */
      (void*) fat_initialize, /* vfsInitFS   */
      (void*) read_fat, /* vfsRead     */
      (void*) write_fat, /* vfsWrite    */
      (void*) open_fat, /* vfsOpenFile */
      (void*) unlink_fat, /* vfsUnlink   */
      (void*) mkdir_fat, /* vfsMakeDir  */
      NULL, /* vfsRemDir   */
      NULL, /* vfsSync     */
      0xFA /* vfsType     */
  }; /* ubixFileSystem */

  /* Add UbixFS */
  if (vfsRegisterFS(ubixFileSystem) != 0x0) {
    kpanic("Unable To Enable UbixFS");
    return (0x1);
  }

  /* Return */
  return (0x0);
}