use cpal::traits::HostTrait;
use cpal::traits::DeviceTrait;
use cpal::traits::StreamTrait;

fn main() {
    let host = cpal::default_host();
    let dev = host.default_output_device().expect("no audio device found");
    
    let cfg: cpal::StreamConfig = dev.supported_output_configs()
        .expect("couldn't find configs")
        .next()
        .expect("bogus device")
        .with_max_sample_rate().into();
    
    println!("sample rate {:?}", &cfg.sample_rate);
    
    let mut i: f32 = 0.0;
    
    let stream = dev.build_output_stream(
        &cfg,
        move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
            println!("{}", &data.len());
            for sample in data.iter_mut() {
                *sample = cpal::Sample::from(&(i/384000.0*2.0*3.141592 * 340.0).sin());
                i += 1.0;
            }
        },
        move |err| {
            println!("err: {}", err);
        }
    ).expect("could not build stream");
    
    stream.play().unwrap();

    loop {}
    println!("Hello, world!");
}