use log::{debug, info, warn};
use std::{
    fs::{File, OpenOptions},
    io::{Read, Write},
    str::from_utf8,
};

fn main() -> anyhow::Result<()> {
    pretty_env_logger::try_init()?;
    let mut controller_data = [0; 4];

    let mut vblank = File::open("vblank")?;
    let mut input = OpenOptions::new().write(true).open("input")?;
    let mut demofile = File::open("demo.m64")?;

    {
        let mut buf = [0; 1024];
        demofile.read(&mut buf)?;
    }

    info!("ready");

    loop {
        let mut data = [0; 3];
        debug!("waiting for vblank");
        vblank.read(&mut data)?;
        let str = from_utf8(&data)?;
        debug!("got data: {}", str);
        if str == "BYE" {
            warn!("asked to exit by the game");
            return Ok(());
        }
        demofile.read(&mut controller_data)?;
        input.write(&controller_data)?;
    }
}