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#pragma once
#include "VirtualFileSystem.h"
#include "InodeMetadata.h"
#include "FIFO.h"
#include <AK/ByteBuffer.h>
#include <AK/CircularQueue.h>
#include <AK/Retainable.h>
#include <AK/Badge.h>
class TTY;
class MasterPTY;
class Process;
class FileDescriptor : public Retainable<FileDescriptor> {
public:
static RetainPtr<FileDescriptor> create(RetainPtr<Inode>&&);
static RetainPtr<FileDescriptor> create(RetainPtr<CharacterDevice>&&);
static RetainPtr<FileDescriptor> create_pipe_writer(FIFO&);
static RetainPtr<FileDescriptor> create_pipe_reader(FIFO&);
~FileDescriptor();
RetainPtr<FileDescriptor> clone();
int close();
off_t seek(off_t, int whence);
ssize_t read(Process&, byte*, size_t);
ssize_t write(Process&, const byte* data, size_t);
int fstat(stat*);
bool can_read(Process&);
bool can_write(Process&);
ssize_t get_dir_entries(byte* buffer, size_t);
ByteBuffer read_entire_file(Process&);
String absolute_path();
bool is_directory() const;
bool is_character_device() const { return m_device.ptr(); }
CharacterDevice* character_device() { return m_device.ptr(); }
const CharacterDevice* character_device() const { return m_device.ptr(); }
bool is_tty() const;
const TTY* tty() const;
TTY* tty();
bool is_master_pty() const;
const MasterPTY* master_pty() const;
MasterPTY* master_pty();
InodeMetadata metadata() const;
Inode* inode() { return m_inode.ptr(); }
const Inode* inode() const { return m_inode.ptr(); }
bool supports_mmap() const { return m_inode && !m_device; }
bool is_blocking() const { return m_is_blocking; }
void set_blocking(bool b) { m_is_blocking = b; }
dword file_flags() const { return m_file_flags; }
void set_file_flags(dword flags) { m_file_flags = flags; }
bool is_fifo() const { return m_fifo; }
FIFO::Direction fifo_direction() { return m_fifo_direction; }
ByteBuffer& generator_cache() { return m_generator_cache; }
void set_original_inode(Badge<VFS>, RetainPtr<Inode>&& inode) { m_inode = move(inode); }
private:
friend class VFS;
explicit FileDescriptor(RetainPtr<Inode>&&);
explicit FileDescriptor(RetainPtr<CharacterDevice>&&);
FileDescriptor(FIFO&, FIFO::Direction);
RetainPtr<Inode> m_inode;
RetainPtr<CharacterDevice> m_device;
off_t m_current_offset { 0 };
ByteBuffer m_generator_cache;
bool m_is_blocking { true };
dword m_file_flags { 0 };
RetainPtr<FIFO> m_fifo;
FIFO::Direction m_fifo_direction { FIFO::Neither };
bool m_closed { false };
};
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