//
// Created by rick on 19-09-21.
//

#ifndef NEW_KERNEL_VFS_H
#define NEW_KERNEL_VFS_H

#include <stdbool.h>
#include <sys/stat.h>

#define VFS_MOUNT_OK    0
#define VFS_MOUNT_ERROR 1

#define VFS_OPEN_ERROR 1
#define VFS_OPEN_OK 0

#define VFS_CLOSE_OK 1

#define VFS_READ_ERROR (-1)

#define VFS_DGETENTS_ERR 1

struct vfs_mount;

typedef struct vfs_mount {
    struct {
    } flags;
    const char *prefix;
    const char *device;
    void *driver; // vfs_mount_driver_t
    void *global_driver_data;
    struct vfs_mount *next;
} vfs_mount_t;

typedef struct vfs_fd {
    struct {
    } flags;
    vfs_mount_t *mount;
    void *driver_data;
} vfs_fd_t;

#define VFS_DIRENT_BASE_SIZE (4 + 4 + 2 + 1)
#define VFS_DIRENT_SIZE(name_length) ((VFS_DIRENT_BASE_SIZE + (name_length) + 1 + 15) & (~0xF))
#define VFS_DIRENT_MAX_SIZE (VFS_DIRENT_BASE_SIZE + 256 + 1)

typedef struct vfs_dirent {
    uint32_t inode;
    uint32_t offset_next;
    uint16_t reclen;
    uint8_t type;
    char name[];
} vfs_dirent_t;

int vfs_mount(const char *path, const char *device, const char *driver);

// https://man7.org/linux/man-pages/man2/open.2.html
vfs_fd_t *vfs_open(const char *path, int flags, int mode);

void vfs_close(vfs_fd_t *fd);

// https://man7.org/linux/man-pages/man2/stat.2.html
int vfs_fstat(vfs_fd_t *fd, stat_t *target, int flags);

// https://man7.org/linux/man-pages/man2/read.2.html
int vfs_read(vfs_fd_t *fd, void *target, size_t size);

// inspiration https://man7.org/linux/man-pages/man2/getdents.2.html
int vfs_getdents(vfs_fd_t *fd, void *target, int count);

#endif //NEW_KERNEL_VFS_H