use crate::*;

pub type SequencerApp = AppContainer<
    Tui,
    SequencerModel,
    SequencerView<Tui>,
    SequencerViewCommand,
    SequencerAudio,
    SequencerStatusBar
>;

impl TryFrom<&Arc<RwLock<JackClient>>> for SequencerApp {
    type Error = Box<dyn std::error::Error>;
    fn try_from (jack: &Arc<RwLock<JackClient>>) -> Usually<Self> {
        let clock = Arc::new(Clock::from(Instant::default()));

        let transport = Arc::new(RwLock::new(tek_api::Transport {
            metronome: false,
            transport: jack.read().unwrap().transport(),
            jack:      jack.clone(),
            clock:     clock.clone()
        }));

        let phrases = Arc::new(RwLock::new(PhrasePool {
            phrases: vec![] // FIXME
        }));

        let player = Arc::new(RwLock::new(MIDIPlayer::new(jack, &clock, "preview")?));

        let model = Arc::new(RwLock::new(SequencerModel {
            transport: transport.clone(),
            phrases:   phrases.clone(),
            player:    player.clone()
        }));

        Ok(Self::new(
            &model,
            SequencerView::from(&model),
            SequencerAudio(transport.clone(), player.clone()),
            None,
            None,
        ))
    }
}

pub struct SequencerModel {
    /// State of the JACK transport.
    pub transport: Arc<RwLock<tek_api::Transport>>,
    /// State of the phrase pool.
    pub phrases:   Arc<RwLock<PhrasePool>>,
    /// State of the phrase player.
    pub player:    Arc<RwLock<MIDIPlayer>>,
}

impl<E: Engine> From<&Arc<RwLock<SequencerModel>>> for SequencerView<E> {
    fn from (model: &Arc<RwLock<SequencerModel>>) -> Self {
        Self {
            split:     20,
            transport: TransportView::from(&model.read().unwrap().transport),
            phrases:   PhrasePoolView::from(&model.read().unwrap().phrases),
            editor:    PhraseEditor::new(),
            model:     model.clone(),
        }
    }
}

/// Root level object for standalone `tek_sequencer`.
/// Also embeddable, in which case the `player` is used for preview.
pub struct SequencerView<E: Engine> {
    pub model:     Arc<RwLock<SequencerModel>>,
    /// Displays the JACK transport.
    pub transport: TransportView<E>,
    /// Displays the phrase pool
    pub phrases:   PhrasePoolView<E>,
    /// Displays the phrase editor
    pub editor:    PhraseEditor<E>,
    /// Width of phrase pool
    pub split:     u16,
}

impl Content for SequencerView<Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        col!(
            self.transport,
            Split::right(20, widget(&self.phrases), widget(&self.editor)).min_y(20)
        )
    }
}