use byte_slice_cast::AsByteSlice;
use std::{fs::File, io::Write};

use oxisynth::{MidiEvent, OxiError, SoundFont, Synth};

fn main() {
    use env_logger::Env;
    env_logger::Builder::from_env(Env::default().default_filter_or("info")).init();
    synth_sf2().unwrap();
}

fn synth_sf2() -> Result<(), OxiError> {
    let mut pcm = File::create("Out.sf2.pcm").unwrap();

    let mut synth = Synth::default();

    let mut file = File::open("./testdata/sin.sf2").unwrap();
    let font = SoundFont::load(&mut file).unwrap();
    let sin = synth.add_font(font, true);

    let mut file = File::open("./testdata/Boomwhacker.sf2").unwrap();
    let font = SoundFont::load(&mut file).unwrap();
    let boom = synth.add_font(font, true);

    synth.program_select(0, sin, 0, 0).unwrap();
    synth.program_select(1, boom, 0, 0).unwrap();

    let mut samples = [0f32; 44100 / 8];

    for _ in 0..5 {
        for n in 50..100 {
            synth.send_event(MidiEvent::NoteOn {
                channel: 0,
                key: n,
                vel: 127,
            })?;
            synth.send_event(MidiEvent::NoteOn {
                channel: 1,
                key: n,
                vel: 127,
            })?;

            synth.write(samples.as_mut());
            pcm.write_all(samples.as_byte_slice()).unwrap();

            synth.send_event(MidiEvent::NoteOff { channel: 0, key: n })?;
            synth.send_event(MidiEvent::NoteOff { channel: 1, key: n })?;
        }
        for n in 0..50 {
            synth.send_event(MidiEvent::NoteOn {
                channel: 0,
                key: 100 - n,
                vel: 127,
            })?;
            synth.send_event(MidiEvent::NoteOn {
                channel: 1,
                key: 100 - n,
                vel: 127,
            })?;

            synth.write(samples.as_mut());
            pcm.write_all(samples.as_byte_slice()).unwrap();

            synth.send_event(MidiEvent::NoteOff {
                channel: 0,
                key: 100 - n,
            })?;
            synth.send_event(MidiEvent::NoteOff {
                channel: 1,
                key: 100 - n,
            })?;
        }
    }

    Ok(())
}