use crate::*;

pub enum MixerTrackCommand {}

/// A mixer track.
#[derive(Debug)]
pub struct MixerTrack {
    pub name:    String,
    /// Inputs of 1st device
    pub audio_ins: Vec<Port<AudioIn>>,
    /// Outputs of last device
    pub audio_outs: Vec<Port<AudioOut>>,
    /// Device chain
    pub devices: Vec<Box<dyn MixerTrackDevice>>,
}

//impl MixerTrackDevice for LV2Plugin {}

impl MixerTrack {
    const SYM_NAME:    &'static str = ":name";
    const SYM_GAIN:    &'static str = ":gain";
    const SYM_SAMPLER: &'static str = "sampler";
    const SYM_LV2:     &'static str = "lv2";
    pub fn from_edn <'a, 'e> (jack: &Arc<RwLock<JackClient>>, args: &[Edn<'e>]) -> Usually<Self> {
        let mut _gain = 0.0f64;
        let mut track = MixerTrack {
            name:       String::new(),
            audio_ins:  vec![],
            audio_outs: vec![],
            devices:    vec![],
        };
        edn!(edn in args {
            Edn::Map(map) => {
                if let Some(Edn::Str(n)) = map.get(&Edn::Key(Self::SYM_NAME)) {
                    track.name = n.to_string();
                }
                if let Some(Edn::Double(g)) = map.get(&Edn::Key(Self::SYM_GAIN)) {
                    _gain = f64::from(*g);
                }
            },
            Edn::List(args) => match args.get(0) {
                // Add a sampler device to the track
                Some(Edn::Symbol(Self::SYM_SAMPLER)) => {
                    track.devices.push(
                        Box::new(Sampler::from_edn(jack, &args[1..])?) as Box<dyn MixerTrackDevice>
                    );
                    panic!(
                        "unsupported in track {}: {:?}; tek_mixer not compiled with feature \"sampler\"",
                        &track.name,
                        args.get(0).unwrap()
                    )
                },
                // Add a LV2 plugin to the track.
                Some(Edn::Symbol(Self::SYM_LV2)) => {
                    track.devices.push(
                        Box::new(LV2Plugin::from_edn(jack, &args[1..])?) as Box<dyn MixerTrackDevice>
                    );
                    panic!(
                        "unsupported in track {}: {:?}; tek_mixer not compiled with feature \"plugin\"",
                        &track.name,
                        args.get(0).unwrap()
                    )
                },
                None =>
                    panic!("empty list track {}", &track.name),
                _ =>
                    panic!("unexpected in track {}: {:?}", &track.name, args.get(0).unwrap())
            },
            _ => {}
        });
        Ok(track)
    }
}

pub trait MixerTrackDevice: Debug + Send + Sync {
    fn boxed (self) -> Box<dyn MixerTrackDevice> where Self: Sized + 'static {
        Box::new(self)
    }
}

impl MixerTrackDevice for Sampler {}

impl MixerTrackDevice for Plugin {}