/* Calcite, src/kernel/fs.h
 * Copyright 2025 Benji Dial
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <https://www.gnu.org/licenses/>.
 */

#pragma once

#include "drives.h"

#include <kernel-public/files.h>
#include <stdint.h>

struct fs_stat {
  uint64_t bytes;
};

struct fs_info {

  const struct drive_info *drive;
  const void *driver_info;

  enum fs_access_result (*free_node)(
    const struct fs_info *info, void *node);

  enum fs_access_result (*look_up_file)(
    const struct fs_info *info, void **node_out, const char *path);

  enum fs_access_result (*stat_file)(
    const struct fs_info *info, void *node, struct fs_stat *stat_out);

  //start is in bytes. bounds-checking is caller responsibility.
  enum fs_access_result (*read_file)(
    const struct fs_info *info, void *node,
    void *buffer, uint64_t start, uint64_t bytes);

};

enum fs_access_result create_fs_info(
  const struct drive_info *drive, struct fs_info *fs_out, const char *fs_type);

void set_fs(const char *name, const struct fs_info *fs);

//returns 0 if no fs is set with that name.
const struct fs_info *get_fs(const char *name);

enum fs_access_result look_up_file(const char *uri, const struct fs_info **fs_out, void **node_out);