#ifndef FILE_H_
    #define FILE_H_

    #include <dirent.h>
    #include <sys/stat.h>
    #include "fat.h"
    #include "nds.h"
    #include "../bang.h"
    #include "../types/pathbuf.h"


    // Bedrock file device.
    typedef struct {
        FILE *file;           // Opaque ID referencing current file (if any)
                              // See ANSI C89 Standard, page 126
        DIR  *dir;            // Structure referencing current directory (if any)
                              // See 'libnds/libs/libnds/include/sys/dirent.h:41'
        u32 dir_i;            // Index of next child to be read from current directory
        bool is_root;         // True if the current directory is the root directory.
        struct dirent *child; // Information about selected child (file or dir)
                              // See 'libnds/libs/libnds/include/sys/dirent.h:17'

        PathBuf open;         // Write buffer for open port
        PathBuf action;       // Write buffer for action port
        PathBuf path;         // Path of current entry
        PathBuf child_path;   // Path of selected child
        u32 address;          // Address into current entry (file or dir)
        u32 length;           // Length of current entry (file or dir)
        bool length_cached;   // True if length has been calculated.
        u32 address_write;    // Write cache for address
        u32 length_write;     // Write cache for length
        bool error;           // True if error occurred since last read
    } FileDevice;

    // Functions.
    void init_nds_filesystem();
    bool nds_filesystem_enabled();

    // Methods.
    void fs_reset(FileDevice *fs);
    void fs_calculate_length(FileDevice *fs);
    bool fs_get_open(FileDevice *fs);
    bool fs_get_error(FileDevice *fs);
    bool fs_get_type(FileDevice *fs);
    bool fs_get_child_type(FileDevice *fs);
    void fs_push_open(FileDevice *fs, u8 byte);
    void fs_push_action(FileDevice *fs, u8 byte);
    u8 fs_read_byte(FileDevice *fs);
    void fs_write_byte(FileDevice *fs, u8 byte);
    void fs_ascend(FileDevice *fs);
    void fs_descend(FileDevice *fs);
    void fs_seek(FileDevice *fs);
    void fs_resize(FileDevice *fs);
#endif