// This file is part of noxos and licensed under the MIT open source license

#ifndef NOX_FILE_DESCRIPTOR_H
#define NOX_FILE_DESCRIPTOR_H

#include "utils/stdtypes.h"
#include "utils/bitmap.h"
#include "drivers/fs/vfs.h"

#define FILE_DESCRIPTOR_ARRAY_CHUNK_SIZE 32

typedef uint32_t file_descriptor_t;

typedef enum {
    FILE_DESCRIPTOR_INVALID,
    FILE_DESCRIPTOR_STDOUT,
    FILE_DESCRIPTOR_STDIN,
    FILE_DESCRIPTOR_STDERR,

    FILE_DESCRIPTORS_ENUM_END
} std_file_descriptors_E;

typedef struct file_descriptor_array_chunk_T file_descriptor_array_chunk_T;
struct file_descriptor_array_chunk_T {
    file_descriptor_array_chunk_T*  prev;
    file_descriptor_array_chunk_T*  next;
    vfs_node_T*                     lookup  [FILE_DESCRIPTOR_ARRAY_CHUNK_SIZE];
    bitmap_T                        bitmap;
    uint32_t                        amount;
};

typedef struct {
    file_descriptor_array_chunk_T*  base_chunk;
} file_descriptor_array_T;

file_descriptor_t               file_descriptor_request                 (file_descriptor_array_T* fd_array, vfs_node_T* node);
vfs_node_T*                     file_descriptor_resolve                 (file_descriptor_array_T* fd_array, file_descriptor_t fd);
void                            file_descriptor_free                    (file_descriptor_array_T* fd_array, file_descriptor_t fd);

file_descriptor_array_T*        file_descriptor_array_alloc             ();
void                            file_descriptor_array_destruct          (file_descriptor_array_T* fd_array);

file_descriptor_array_chunk_T*  file_descriptor_array_chunk_alloc       (file_descriptor_array_chunk_T* prev);
void                            file_descriptor_array_chunk_destruct    (file_descriptor_array_chunk_T* chunk);

#endif //NOX_FILE_DESCRIPTOR_H