use crate::*;
use ClockCommand::{Play, Pause};
use KeyCode::{Tab, Char};
use SequencerCommand as Cmd;
use MidiEditCommand::*;
use PhrasePoolCommand::*;
/// Root view for standalone `tek_sequencer`.
pub struct SequencerTui {
    _jack: Arc<RwLock<JackConnection>>,

    pub pool:   PoolModel,
    pub editor: MidiEditor,
    pub player: MidiPlayer,

    pub transport: bool, 
    pub selectors: bool, 
    pub compact:   bool,

    pub clock:     Clock,
    pub size:      Measure<Tui>,
    pub status:    bool,
    pub note_buf:  Vec<u8>,
    pub midi_buf:  Vec<Vec<Vec<u8>>>,
    pub perf:      PerfModel,
}
from_jack!(|jack|SequencerTui {
    let clock = Clock::from(jack);
    let phrase = Arc::new(RwLock::new(MidiClip::new(
        "Clip", true, 4 * clock.timebase.ppq.get() as usize,
        None, Some(ItemColor::random().into())
    )));
    Self {
        _jack: jack.clone(),

        pool:   PoolModel::from(&phrase),
        editor: MidiEditor::from(&phrase),
        player: MidiPlayer::from((&clock, &phrase)),

        compact:   true,
        transport: true,
        selectors: true,
        size:      Measure::new(),
        midi_buf:  vec![vec![];65536],
        note_buf:  vec![],
        perf:      PerfModel::default(),
        status:    true,
        clock,
    }
});
render!(Tui: (self: SequencerTui) => self.size.of(
    Bsp::s(self.toolbar_view(),
    Bsp::n(self.status_view(),
    Bsp::w(self.pool_view(), Fill::xy(&self.editor))))));
impl SequencerTui {
    fn toolbar_view (&self) -> impl Content<Tui> + use<'_> {
        self.transport.then(||TransportView::new(true, &self.clock))
    }
    fn status_view (&self) -> impl Content<Tui> + use<'_> {
        let edit_clip = MidiEditClip(&self.editor);
        let selectors = When(self.selectors, Bsp::e(ClipSelected::play_phrase(&self.player), ClipSelected::next_phrase(&self.player)));
        row!(selectors, edit_clip, MidiEditStatus(&self.editor))
    }
    fn pool_view (&self) -> impl Content<Tui> + use<'_> {
        let w = self.size.w();
        let phrase_w = if w > 60 { 20 } else if w > 40 { 15 } else { 10 };
        let pool_w = if self.pool.visible { phrase_w } else { 0 };
        let pool = Pull::y(1, Fill::y(Align::e(PoolView(self.pool.visible, &self.pool))));
        Fixed::x(pool_w, Align::e(Fill::y(PoolView(self.compact, &self.pool))))
    }
}
audio!(|self:SequencerTui, client, scope|{
    // Start profiling cycle
    let t0 = self.perf.get_t0();
    // Update transport clock
    if Control::Quit == ClockAudio(self).process(client, scope) {
        return Control::Quit
    }
    // Update MIDI sequencer
    if Control::Quit == PlayerAudio(
        &mut self.player, &mut self.note_buf, &mut self.midi_buf
    ).process(client, scope) {
        return Control::Quit
    }
    // End profiling cycle
    self.perf.update(t0, scope);
    Control::Continue
});
has_size!(<Tui>|self:SequencerTui|&self.size);
has_clock!(|self:SequencerTui|&self.clock);
has_phrases!(|self:SequencerTui|self.pool.phrases);
has_editor!(|self:SequencerTui|self.editor);
handle!(<Tui>|self:SequencerTui,input|SequencerCommand::execute_with_state(self, input.event()));
#[derive(Clone, Debug)] pub enum SequencerCommand {
    Compact(bool),
    History(isize),
    Clock(ClockCommand),
    Pool(PoolCommand),
    Editor(MidiEditCommand),
    Enqueue(Option<Arc<RwLock<MidiClip>>>),
}
keymap!(KEYS_SEQUENCER = |state: SequencerTui, input: Event| SequencerCommand {
    // TODO: k: toggle on-screen keyboard
    ctrl(key(Char('k'))) => { todo!("keyboard") },
    // Transport: Play/pause
    key(Char(' ')) => Cmd::Clock(if state.clock().is_stopped() { Play(None) } else { Pause(None) }),
    // Transport: Play from start or rewind to start
    shift(key(Char(' '))) => Cmd::Clock(if state.clock().is_stopped() { Play(Some(0)) } else { Pause(Some(0)) }),
    // u: undo
    key(Char('u')) => Cmd::History(-1),
    // Shift-U: redo
    key(Char('U')) => Cmd::History( 1),
    // Tab: Toggle compact mode
    key(Tab) => Cmd::Compact(!state.compact),
    // q: Enqueue currently edited phrase
    key(Char('q')) => Cmd::Enqueue(Some(state.pool.phrase().clone())),
    // 0: Enqueue phrase 0 (stop all)
    key(Char('0')) => Cmd::Enqueue(Some(state.phrases()[0].clone())),
    // e: Toggle between editing currently playing or other phrase
    key(Char('e'))  => if let Some((_, Some(playing))) = state.player.play_phrase() {
        let editing  = state.editor.phrase().as_ref().map(|p|p.read().unwrap().clone());
        let selected = state.pool.phrase().clone();
        Cmd::Editor(Show(Some(if Some(selected.read().unwrap().clone()) != editing {
            selected
        } else {
            playing.clone()
        })))
    } else {
        return None
    }
}, if let Some(command) = MidiEditCommand::input_to_command(&state.editor, input) {
    Cmd::Editor(command)
} else if let Some(command) = PoolCommand::input_to_command(&state.pool, input) {
    Cmd::Pool(command)
} else {
    return None
});
command!(|self: SequencerCommand, state: SequencerTui|match self {
    Self::Enqueue(phrase) => {
        state.player.enqueue_next(phrase.as_ref());
        None
    },
    Self::Pool(cmd) => match cmd {
        // autoselect: automatically load selected phrase in editor
        PoolCommand::Select(_) => {
            let undo = cmd.delegate(&mut state.pool, Self::Pool)?;
            state.editor.set_phrase(Some(state.pool.phrase()));
            undo
        },
        // update color in all places simultaneously
        PoolCommand::Phrase(SetColor(index, _)) => {
            let undo = cmd.delegate(&mut state.pool, Self::Pool)?;
            state.editor.set_phrase(Some(state.pool.phrase()));
            undo
        },
        _ => cmd.delegate(&mut state.pool, Self::Pool)?
    },
    Self::Editor(cmd) => cmd.delegate(&mut state.editor,  Self::Editor)?,
    Self::Clock(cmd)  => cmd.delegate(state, Self::Clock)?,
    Self::History(delta) => {
        todo!("undo/redo")
    },
    Self::Compact(compact) => if state.compact != compact {
        state.compact = compact;
        Some(Self::Compact(!compact))
    } else {
        None
    },
});