use io::{IoBase, Read, Write};

use crate::syscall;

#[derive(Debug)]
pub struct File {
    fd: u64,
}

impl File {
    /// # Safety
    /// The file descriptor must be valid
    pub unsafe fn from_raw_fd(fd: u64) -> Self {
        Self { fd }
    }

    pub fn as_fd(&self) -> u64 {
        self.fd
    }
}

impl IoBase for File {
    type Error = ();
}

impl Read for File {
    fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
        Ok(syscall::read(self.as_fd(), buf) as usize)
    }
}

impl Write for File {
    fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
        Ok(syscall::write(self.as_fd(), buf) as usize)
    }

    fn flush(&mut self) -> Result<(), Self::Error> {
        todo!()
    }
}