use crate::*;

/// The sampler plugin plays sounds.
#[derive(Debug)]
pub struct Sampler {
    pub jack:        Arc<RwLock<JackClient>>,
    pub name:        String,
    pub mapped:      BTreeMap<u7, Arc<RwLock<Sample>>>,
    pub unmapped:    Vec<Arc<RwLock<Sample>>>,
    pub voices:      Arc<RwLock<Vec<Voice>>>,
    pub midi_in:     Port<MidiIn>,
    pub audio_outs:  Vec<Port<AudioOut>>,
    pub buffer:      Vec<Vec<f32>>,
    pub output_gain: f32
}

impl Sampler {
    pub fn from_edn <'e> (jack: &Arc<RwLock<JackClient>>, args: &[Edn<'e>]) -> Usually<Self> {
        let mut name = String::new();
        let mut dir  = String::new();
        let mut samples = BTreeMap::new();
        edn!(edn in args {
            Edn::Map(map) => {
                if let Some(Edn::Str(n)) = map.get(&Edn::Key(":name")) {
                    name = String::from(*n);
                }
                if let Some(Edn::Str(n)) = map.get(&Edn::Key(":dir")) {
                    dir = String::from(*n);
                }
            },
            Edn::List(args) => match args.get(0) {
                Some(Edn::Symbol("sample")) => {
                    let (midi, sample) = Sample::from_edn(jack, &dir, &args[1..])?;
                    if let Some(midi) = midi {
                        samples.insert(midi, sample);
                    } else {
                        panic!("sample without midi binding: {}", sample.read().unwrap().name);
                    }
                },
                _ => panic!("unexpected in sampler {name}: {args:?}")
            },
            _ => panic!("unexpected in sampler {name}: {edn:?}")
        });
        Ok(Sampler {
            jack:        jack.clone(),
            name:        name.into(),
            mapped:      samples,
            unmapped:    Default::default(),
            voices:      Default::default(),
            buffer:      Default::default(),
            midi_in:     jack.read().unwrap().register_port("in", MidiIn::default())?,
            audio_outs:  vec![],
            output_gain: 0.
        })
    }
}