use crate::*;
use ClockCommand::{Play, Pause};
use KeyCode::{Tab, Char};
use SequencerCommand::*;
use PhraseCommand::*;
use PhrasePoolCommand::*;
/// Root view for standalone `tek_sequencer`.
pub struct SequencerTui {
    _jack: Arc<RwLock<JackConnection>>,
    pub transport: bool, 
    pub selectors: bool, 
    pub clock:     ClockModel,
    pub phrases:   PoolModel,
    pub player:    MidiPlayer,
    pub editor:    MidiEditor,
    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 = ClockModel::from(jack);
    let phrase = Arc::new(RwLock::new(MidiClip::new(
        "New", true, 4 * clock.timebase.ppq.get() as usize,
        None, Some(ItemColor::random().into())
    )));
    Self {
        _jack:     jack.clone(),
        transport: true,
        selectors: true,
        phrases:   PoolModel::from(&phrase),
        editor:    MidiEditor::from(&phrase),
        player:    MidiPlayer::from((&clock, &phrase)),
        size:      Measure::new(),
        midi_buf:  vec![vec![];65536],
        note_buf:  vec![],
        perf:      PerfModel::default(),
        status:    true,
        clock,
    }
});
render!(Tui: (self: SequencerTui) => {
    let w            = self.size.w();
    let phrase_w     = if w > 60 { 20 } else if w > 40 { 15 } else { 10 };
    let pool_w       = if self.phrases.visible { phrase_w } else { 0 };
    let pool         = Pull::y(1, Fill::y(Align::e(PoolView(&self.phrases))));
    let with_pool    = move|x|Split::w(false, pool_w, pool, x);
    let status       = SequencerStatus::from(self);
    let with_status  = |x|Split::n(false, if self.status { 2 } else { 0 }, status, x);
    let with_editbar = |x|Split::n(false, 1, MidiEditStatus(&self.editor), x);
    let with_size    = |x|lay!([self.size, x]);
    let editor       = with_editbar(with_pool(Fill::xy(&self.editor)));

    let color = self.player.play_phrase().as_ref().map(|(_,p)|
        p.as_ref().map(|p|p.read().unwrap().color)
    ).flatten().clone();

    let toolbar = Cond::when(self.transport, row!([
        PlayPause(self.clock.is_rolling()),
        TransportView::new(self, color, true),
    ]));

    let play_queue = Cond::when(self.selectors, row!([
        PhraseSelector::play_phrase(&self.player),
        PhraseSelector::next_phrase(&self.player),
    ]));

    Min::y(15, with_size(with_status(col!([
        toolbar,
        play_queue,
        editor,
    ]))))
});
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.phrases.phrases);
has_editor!(|self:SequencerTui|self.editor);
handle!(<Tui>|self:SequencerTui,input|SequencerCommand::execute_with_state(self, input));
#[derive(Clone, Debug)] pub enum SequencerCommand {
    History(isize),
    Clock(ClockCommand),
    Pool(PoolCommand),
    Editor(PhraseCommand),
    Enqueue(Option<Arc<RwLock<MidiClip>>>),
}
input_to_command!(SequencerCommand: <Tui>|state: SequencerTui, input|match input.event() {
    // TODO: k: toggle on-screen keyboard
    key_pat!(Ctrl-Char('k')) => { todo!("keyboard") },
    // Transport: Play/pause
    key_pat!(Char(' ')) => Clock(
        if state.clock().is_stopped() { Play(None) } else { Pause(None) }
    ),
    // Transport: Play from start or rewind to start
    key_pat!(Shift-Char(' ')) => Clock(
        if state.clock().is_stopped() { Play(Some(0)) } else { Pause(Some(0)) }
    ),
    // u: undo
    key_pat!(Char('u')) => History(-1),
    // Shift-U: redo
    key_pat!(Char('U')) => History( 1),
    // Tab: Toggle visibility of phrase pool column
    key_pat!(Tab) => Pool(PoolCommand::Show(!state.phrases.visible)),
    // q: Enqueue currently edited phrase
    key_pat!(Char('q')) => Enqueue(Some(state.phrases.phrase().clone())),
    // 0: Enqueue phrase 0 (stop all)
    key_pat!(Char('0')) => Enqueue(Some(state.phrases.phrases()[0].clone())),
    // e: Toggle between editing currently playing or other phrase
    key_pat!(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.phrases.phrase().clone();
        Editor(Show(Some(if Some(selected.read().unwrap().clone()) != editing {
            selected
        } else {
            playing.clone()
        })))
    } else {
        return None
    },
    // For the rest, use the default keybindings of the components.
    // The ones defined above supersede them.
    _ => if let Some(command) = PhraseCommand::input_to_command(&state.editor, input) {
        Editor(command)
    } else if let Some(command) = PoolCommand::input_to_command(&state.phrases, input) {
        Pool(command)
    } else {
        return None
    }
});
command!(|self: SequencerCommand, state: SequencerTui|match self {
    Self::Pool(cmd) => {
        let mut default = |cmd: PoolCommand|cmd
            .execute(&mut state.phrases)
            .map(|x|x.map(Pool));
        match cmd {
            // autoselect: automatically load selected phrase in editor
            PoolCommand::Select(_) => {
                let undo = default(cmd)?;
                state.editor.set_phrase(Some(state.phrases.phrase()));
                undo
            },
            // update color in all places simultaneously
            PoolCommand::Phrase(SetColor(index, _)) => {
                let undo = default(cmd)?;
                state.editor.set_phrase(Some(state.phrases.phrase()));
                undo
            },
            _ => default(cmd)?
        }
    },
    Self::Editor(cmd) => {
        let default = ||cmd.execute(&mut state.editor).map(|x|x.map(Editor));
        match cmd {
            _ => default()?
        }
    },
    Self::Clock(cmd) => cmd.execute(state)?.map(Clock),
    Self::Enqueue(phrase) => {
        state.player.enqueue_next(phrase.as_ref());
        None
    },
    Self::History(delta) => {
        todo!("undo/redo")
    },
});