#ifndef MERCURY_KERNEL_FS_TARFS_HPP
#define MERCURY_KERNEL_FS_TARFS_HPP

#include <mercury/kernel/storage.hpp>

namespace mercury::kernel::fs {

  class tarfs_instance : public storage::file_system_instance {

  private:
    storage::block_device *bd;

    storage::io_result next_node(storage::node_id_t &node);
    //name_buf must be at least 255 chars long.
    storage::io_result read_name(storage::node_id_t node, char *name_buf, unsigned &name_len_out);
    //len <= 12
    storage::io_result read_num(uint64_t offset, unsigned len, uint64_t &out);

  public:
    tarfs_instance(storage::block_device *bd);

    storage::io_result get_root_node(storage::node_id_t &out) override;
    storage::io_result get_first_child(
      storage::node_id_t node, storage::node_id_t &out, storage::directory_iter_t &iter_out) override;
    storage::io_result get_next_child(
      storage::node_id_t node, storage::node_id_t &out, storage::directory_iter_t &iter) override;
    storage::io_result get_child(
      storage::node_id_t node, storage::node_id_t &out, const char *name, unsigned name_len) override;
    storage::io_result get_name_length(storage::node_id_t node, unsigned &length_out) override;
    storage::io_result get_name(storage::node_id_t node, char *buffer, unsigned &length_out) override;
    storage::io_result get_file_length(storage::node_id_t node, uint64_t &length_out) override;
    storage::io_result get_file_type(storage::node_id_t node, storage::file_type &out) override;
    storage::io_result resize_file(storage::node_id_t node, uint64_t new_length) override;
    storage::io_result read_bytes_from_file(
      storage::node_id_t node, uint64_t start, uint64_t count, void *into) override;
    storage::io_result write_bytes_into_file(
      storage::node_id_t node, uint64_t start, uint64_t count, const void *from) override;

  };

  storage::io_result tarfs_mounter(storage::block_device *bd, storage::file_system_instance *&fs_out);

}

#endif