#ifndef _DUCKFS_H
#define _DUCKFS_H

#include <stdint.h>

#define DFS_MAGIC 0xDF1984CC

#define DFS_BLOCK_SIZE     512

#define DFS_VERSION_0      "DuckFS, wheresDax?"
#define DFS_VERSION_1      "DuckFS, Terminator"
#define DFS_VERSION_2      "DuckFS-Terminator2"
#define DFS_VERSION_3      "DuckFS,StarWarsEIV"
#define DFS_VERSION_4      "DuckFS QUACK,QUACK"


#define DFS_FILE_ERROR     -8
#define DFS_FILE_UNUSED    -1
#define DFS_FILE_USED      0
#define DFS_FILE_TEXT      0
#define DFS_FILE_BINARY    1
#define DFS_FILE_DIRECTORY 2

/* encryption algorithms */
#define DFS_CAESAR_5       88
#define DFS_CAESAR_8       84
#define DFS_CAESAR_2       09
#define DFS_QUACK_32       99

#define DFS_MAX_FILENAME_LEN   64
#define DFS_MAX_FILES          256


typedef struct duckfs_file_header {
  char filename[DFS_MAX_FILENAME_LEN + 1]; /* + 1 for the \0 */
  char permissions[3]; /* Same thing here */
  
  /*
  512 Bytes per sector, meaning a 2 sector file is 1024 bytes, or 1 KiB.
  Only valid if this file is not a directory.
  */
  int32_t num_sectors;
  
  int16_t type; /* Indicates the file type. -1 for null file, 0 for a text file, 1 for a binary file, and 2 for a directory. */
  
  uint16_t _reserved0; /* (align to 4) */
  
  struct duckfs_file_header* next;
  struct duckfs_file_header* prev;
  struct duckfs_file_header* contents; /* contains the directories files. only valid if this file is a directory. */
  
  uint32_t lba_start; /* only is valid if this file is not a directory. */
  uint32_t lba_end; /* only is valid if this file is not a directory. */
  
  uint8_t _reserved1[158]; /* padding to 256 bytes total */
} duckfs_file_header_t;

typedef struct duckfs_superblock {
  int32_t duckfs_magic; /* must be DFS_MAGIC. */
  char duckfs_version_string[19];
  char volume_label[19]; /* 18 characters and a null zero. */

  int16_t encryption;
  
  struct duckfs_file_header* duckfs_root;
  
  uint32_t _padding[116];
} duckfs_superblock_t;

int32_t duckfs_init(int16_t drive);
void duckfs_format(int16_t drive);

int32_t duckfs_makedir(const char* filename, const char* perms);
void duckfs_free_directory(duckfs_file_header_t* dir);

duckfs_file_header_t duckfs_create_entry(const char* name, const char* perms, const char* type);
bool duckfs_add_entry(duckfs_file_header_t* dir, duckfs_file_header_t* entry);

#endif