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

#ifndef NOX_VFS_H
#define NOX_VFS_H

#include "utils/stdtypes.h"
#include "utils/string.h"
#include "boot/boot_info.h"

#define VFS_MAX_NAME_LENGTH 128

typedef struct vfs_node_T vfs_node_T;

typedef enum {
    FS_RAMFS,

    FS_ENUM_END
} fs_type_E;

typedef enum {
    VFS_NODE_DIRECTORY,
    VFS_NODE_FILE,
    VFS_NODE_MOUNT,
    VFS_NODE_BLOCK_DEVICE,

    VFS_NODE_ENUM_END
} vfs_node_type_E;

typedef struct {
    fs_type_E   type;
    vfs_node_T* root_node;
} fs_T;

typedef struct {
    void*       buffer;
    uint64_t    buffer_size;
    bool        reclaimable;
    vfs_node_T* node;
} vfs_node_cache_T;

struct vfs_node_T{
    char                name[VFS_MAX_NAME_LENGTH];
    vfs_node_type_E     type;
    vfs_node_cache_T*   cache;
    uint64_t            size;
    void*               specific;
    fs_T*               filesystem;

    vfs_node_T*         prev;
    vfs_node_T*         next;
    vfs_node_T*         parent;
    vfs_node_T*         childs;
};

extern fs_T g_root_fs;

vfs_node_cache_T*   vfs_node_cache_create       (vfs_node_T* node, uint64_t size);
void                vfs_node_cache_destruct     (vfs_node_cache_T* node_cache);

vfs_node_T*         vfs_node_create             (vfs_node_T* parent, string_t name, vfs_node_type_E type, void* specific);
void                vfs_node_destruct           (vfs_node_T* node);
void                vfs_node_delete             (vfs_node_T* node);
void                vfs_node_dump_info          (vfs_node_T* node, uint64_t indent);
vfs_node_T*         vfs_node_resolve_child      (vfs_node_T* node, string_t child_name);

vfs_node_T*         vfs_file_create             (fs_T* filesystem, string_t path);
void                vfs_file_delete             (vfs_node_T* file);
uint64_t            vfs_file_write              (vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_in);
uint64_t            vfs_file_read               (vfs_node_T* file, uint64_t position, uint64_t size, uint8_t* buffer_out);

vfs_node_T*         vfs_directory_create        (fs_T* filesystem, string_t path);
void                vfs_directory_delete        (vfs_node_T* directory);

void                vfs_init                    (boot_info_T* boot_info);
vfs_node_T*         vfs_resolve_path            (fs_T* filesystem, string_t path);
void                vfs_unpack_archive_ustar    (fs_T* filesystem, void* archive);

#endif //NOX_VFS_H