use crate::*;

impl TryFrom<&Arc<RwLock<JackClient>>> for ArrangerApp<Tui> {
    type Error = Box<dyn std::error::Error>;
    fn try_from (jack: &Arc<RwLock<JackClient>>) -> Usually<Self> {
        Ok(Self::new(ArrangerView {
            name:      Arc::new(RwLock::new(String::new())),
            phrases:   vec![],
            phrase:    0,
            scenes:    vec![],
            tracks:    vec![],
            metronome: false,
            playing:   None.into(),
            started:   None.into(),
            transport: jack.read().unwrap().transport(),
            current:   Instant::default(),
            jack:      jack.clone(),
            selected:  ArrangerSelection::Clip(0, 0),
            mode:      ArrangerMode::Vertical(2),
            color:     Color::Rgb(28, 35, 25).into(),
            size:      Measure::new(),
            entered:   false,
            quant:     Default::default(),
            sync:      Default::default(),
            splits:    [20, 20],
            note_buf:  vec![],
            midi_buf:  vec![],
        }.into(), None, None))
    }
}

pub type ArrangerApp<E: Engine> = AppView<
    E,
    ArrangerView<E>,
    ArrangerAppCommand,
    ArrangerStatusBar
>;

/// Root view for standalone `tek_arranger`
pub struct ArrangerView<E: Engine> {
    pub(crate) jack:      Arc<RwLock<JackClient>>,
    pub(crate) playing:   RwLock<Option<TransportState>>,
    pub(crate) started:   RwLock<Option<(usize, usize)>>,
    pub(crate) current:   Instant,
    pub(crate) quant:     Quantize,
    pub(crate) sync:      LaunchSync,
    pub(crate) transport: jack::Transport,
    pub(crate) metronome: bool,
    pub(crate) phrases:   Vec<Arc<RwLock<Phrase>>>,
    pub(crate) phrase:    usize,
    pub(crate) tracks:    Vec<ArrangerTrack>,
    pub(crate) scenes:    Vec<ArrangerScene>,
    pub(crate) name:      Arc<RwLock<String>>,
    pub(crate) splits:    [u16;2],
    pub(crate) selected:  ArrangerSelection,
    pub(crate) mode:      ArrangerMode,
    pub(crate) color:     ItemColor,
    pub(crate) entered:   bool,
    pub(crate) size:      Measure<E>,
    pub(crate) note_buf:  Vec<u8>,
    pub(crate) midi_buf:  Vec<Vec<Vec<u8>>>,
}

impl HasJack for ArrangerView<Tui> {
    fn jack (&self) -> &Arc<RwLock<JackClient>> {
        &self.transport.jack()
    }
}

impl Audio for ArrangerApp<Tui> {
    fn process (&mut self, client: &Client, scope: &ProcessScope) -> Control {
        TracksAudio(
            &mut self.app.tracks,
            &mut self.app.note_buf,
            &mut self.app.midi_buf,
            Default::default(),
        ).process(client, scope)
    }
}

impl ClockApi for ArrangerView<Tui> {
    fn timebase (&self) -> &Arc<Timebase> {
        &self.current.timebase
    }
    fn quant (&self) -> &Quantize {
        &self.quant
    }
    fn sync (&self) -> &LaunchSync {
        &self.sync
    }
}

impl PlayheadApi for ArrangerView<Tui> {
    fn current (&self) -> &Instant {
        &self.current
    }
    fn transport (&self) -> &jack::Transport {
        &self.transport
    }
    fn playing (&self) -> &RwLock<Option<TransportState>> {
        &self.playing
    }
    fn started (&self) -> &RwLock<Option<(usize, usize)>> {
        &self.started
    }
}

impl HasPhrases for ArrangerView<Tui> {
    fn phrases (&self) -> &Vec<Arc<RwLock<Phrase>>> {
        &self.phrases
    }
    fn phrases_mut (&mut self) -> &mut Vec<Arc<RwLock<Phrase>>> {
        &mut self.phrases
    }
}

/// General methods for arranger
impl ArrangerView<Tui> {
    pub fn selected_scene (&self) -> Option<&ArrangerScene> {
        self.selected.scene().map(|s|self.scenes().get(s)).flatten()
    }
    pub fn selected_scene_mut (&mut self) -> Option<&mut ArrangerScene> {
        self.selected.scene().map(|s|self.scenes_mut().get_mut(s)).flatten()
    }
    pub fn selected_phrase (&self) -> Option<Arc<RwLock<Phrase>>> {
        self.selected_scene()?.clips.get(self.selected.track()?)?.clone()
    }

    /// Focus the editor with the current phrase
    pub fn show_phrase (&mut self) {
        self.editor.show(self.selected_phrase().as_ref());
    }

    pub fn activate (&mut self) {
        let scenes = self.scenes();
        let tracks = self.tracks_mut();
        match self.selected {
            ArrangerSelection::Scene(s) => {
                for (t, track) in tracks.iter_mut().enumerate() {
                    let player = &mut track.player;
                    let clip = scenes[s].clips[t].as_ref();
                    if player.phrase.is_some() || clip.is_some() {
                        player.enqueue_next(clip);
                    }
                }
                // TODO make transport available here, so that
                // activating a scene when stopped starts playback
                //if self.is_stopped() {
                    //self.transport.toggle_play()
                //}
            },
            ArrangerSelection::Clip(t, s) => {
                tracks[t].player.enqueue_next(scenes[s].clips[t]);
            },
            _ => {}
        }
    }

    pub fn is_first_row (&self) -> bool {
        let selected = self.selected;
        selected.is_mix() || selected.is_track()
    }

    pub fn is_last_row (&self) -> bool {
        let selected = self.selected;
        (self.scenes().len() == 0 && (selected.is_mix() || selected.is_track())) || match selected {
            ArrangerSelection::Scene(s)   => s == self.scenes().len() - 1,
            ArrangerSelection::Clip(_, s) => s == self.scenes().len() - 1,
            _ => false
        }
    }

    pub fn toggle_loop (&mut self) {
        if let Some(phrase) = self.selected_phrase() {
            phrase.write().unwrap().toggle_loop()
        }
    }

    pub fn randomize_color (&mut self) {
        match self.selected {
            ArrangerSelection::Mix        => {
                self.color = ItemColor::random_dark()
            },
            ArrangerSelection::Track(t)   => {
                self.tracks_mut()[t].color = ItemColor::random()
            },
            ArrangerSelection::Scene(s)   => {
                self.scenes_mut()[s].color = ItemColor::random()
            },
            ArrangerSelection::Clip(t, s) => {
                if let Some(phrase) = &self.scenes_mut()[s].clips[t] {
                    phrase.write().unwrap().color = ItemColorTriplet::random();
                }
            }
        }
    }
}

impl<E: Engine> Audio for ArrangerView<E> {
    #[inline] fn process (&mut self, client: &Client, scope: &ProcessScope) -> Control {
        if self.process(client, scope) == Control::Quit {
            return Control::Quit
        }
        // FIXME: one of these per playing track
        if let ArrangerSelection::Clip(t, s) = self.selected {
            let phrase = self.scenes().get(s).map(|scene|scene.clips.get(t));
            if let Some(Some(Some(phrase))) = phrase {
                if let Some(track) = self.tracks().get(t) {
                    if let Some((ref started_at, Some(ref playing))) = track.player.phrase {
                        let phrase = phrase.read().unwrap();
                        if *playing.read().unwrap() == *phrase {
                            let pulse = self.current().pulse.get();
                            let start = started_at.pulse.get();
                            let now   = (pulse - start) % phrase.length as f64;
                            self.editor.now.set(now);
                            return Control::Continue
                        }
                    }
                }
            }
        }
        self.editor.now.set(0.);
        return Control::Continue
    }
}
    //pub fn track_next (&mut self, last_track: usize) {
        //use ArrangerSelection::*;
        //*self = match self {
            //Mix        => Track(0),
            //Track(t)   => Track(last_track.min(*t + 1)),
            //Scene(s)   => Clip(0, *s),
            //Clip(t, s) => Clip(last_track.min(*t + 1), *s),
        //}
    //}
    //pub fn track_prev (&mut self) {
        //use ArrangerSelection::*;
        //*self = match self {
            //Mix        => Mix,
            //Scene(s)   => Scene(*s),
            //Track(t)   => if *t == 0 { Mix } else { Track(*t - 1) },
            //Clip(t, s) => if *t == 0 { Scene(*s) } else { Clip(t.saturating_sub(1), *s) }
        //}
    //}
    //pub fn scene_next (&mut self, last_scene: usize) {
        //use ArrangerSelection::*;
        //*self = match self {
            //Mix        => Scene(0),
            //Track(t)   => Clip(*t, 0),
            //Scene(s)   => Scene(last_scene.min(*s + 1)),
            //Clip(t, s) => Clip(*t, last_scene.min(*s + 1)),
        //}
    //}
    //pub fn scene_prev (&mut self) {
        //use ArrangerSelection::*;
        //*self = match self {
            //Mix        => Mix,
            //Track(t)   => Track(*t),
            //Scene(s)   => if *s == 0 { Mix } else { Scene(*s - 1) },
            //Clip(t, s) => if *s == 0 { Track(*t) } else { Clip(*t, s.saturating_sub(1)) }
        //}
    //}

//pub fn arranger_menu_bar () -> MenuBar {
    //use ArrangerCommand as Cmd;
    //use ArrangerCommand       as Edit;
    //use ArrangerSelection   as Focus;
    //use ArrangerTrackCommand  as Track;
    //use ArrangerClipCommand   as Clip;
    //use ArrangerSceneCommand  as Scene;
    //use TransportCommand         as Transport;
    //MenuBar::new()
        //.add({
            //use ArrangerCommand::*;
            //Menu::new("File")
                //.cmd("n", "New project",       ArrangerViewCommand::Arranger(New))
                //.cmd("l", "Load project",      ArrangerViewCommand::Arranger(Load))
                //.cmd("s", "Save project",      ArrangerViewCommand::Arranger(Save))
        //})
        //.add({
            //Menu::new("Transport")
                //.cmd("p", "Play",              TransportCommand::Transport(Play(None)))
                //.cmd("P", "Play from start",   TransportCommand::Transport(Play(Some(0))))
                //.cmd("s", "Pause",             TransportCommand::Transport(Stop(None)))
                //.cmd("S", "Stop and rewind",   TransportCommand::Transport(Stop(Some(0))))
        //})
        //.add({
            //use ArrangerCommand::*;
            //Menu::new("Track")
                //.cmd("a", "Append new",        ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("i", "Insert new",        ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("n", "Rename",            ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("d", "Delete",            ArrangerViewCommand::Arranger(AddTrack))
                //.cmd(">", "Move up",           ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("<", "Move down",         ArrangerViewCommand::Arranger(AddTrack))
        //})
        //.add({
            //use ArrangerCommand::*;
            //Menu::new("Scene")
                //.cmd("a", "Append new",        ArrangerViewCommand::Arranger(AddScene))
                //.cmd("i", "Insert new",        ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("n", "Rename",            ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("d", "Delete",            ArrangerViewCommand::Arranger(AddTrack))
                //.cmd(">", "Move up",           ArrangerViewCommand::Arranger(AddTrack))
                //.cmd("<", "Move down",         ArrangerViewCommand::Arranger(AddTrack))
        //})
        //.add({
            //use PhraseRenameCommand as Rename;
            //use PhraseLengthCommand as Length;
            //Menu::new("Phrase")
                //.cmd("a", "Append new",        PhrasePoolCommand::Phrases(Append))
                //.cmd("i", "Insert new",        PhrasePoolCommand::Phrases(Insert))
                //.cmd("n", "Rename",            PhrasePoolCommand::Phrases(Rename(Rename::Begin)))
                //.cmd("t", "Set length",        PhrasePoolCommand::Phrases(Length(Length::Begin)))
                //.cmd("d", "Delete",            PhrasePoolCommand::Phrases(Delete))
                //.cmd("l", "Load from MIDI...", PhrasePoolCommand::Phrases(Import))
                //.cmd("s", "Save to MIDI...",   PhrasePoolCommand::Phrases(Export))
                //.cmd(">", "Move up",           PhrasePoolCommand::Phrases(MoveUp))
                //.cmd("<", "Move down",         PhrasePoolCommand::Phrases(MoveDown))
        //})
//}

    //pub fn phrase_next (&mut self) {
        //if let ArrangerSelection::Clip(track, scene) = self.selected {
            //if let Some(ref mut phrase) = self.model.scenes[scene].clips[track] {
                //let phrases = self.model.phrases.read().unwrap();
                //let index = phrases.index_of(&*phrase.read().unwrap());
                //if let Some(index) = index {
                    //if index < phrases.len().saturating_sub(1) {
                        //*phrase = phrases[index + 1].clone();
                    //}
                //}
            //}
        //}
    //}
    //pub fn phrase_prev (&mut self) {
        //if let ArrangerSelection::Clip(track, scene) = self.selected {
            //if let Some(ref mut phrase) = self.model.scenes[scene].clips[track] {
                //let phrases = self.model.phrases.read().unwrap();
                //let index = phrases.index_of(&*phrase.read().unwrap());
                //if let Some(index) = index {
                    //if index > 0 {
                        //*phrase = phrases[index - 1].clone();
                    //}
                //}
            //}
        //}
    //}
    
    //pub fn phrase_get (&mut self) {
        //if let ArrangerSelection::Clip(track, scene) = self.selected {
            //if let Some(phrase) = &self.model.scenes[scene].clips[track] {
                //let mut phrases = self.model.phrases.write().unwrap();
                //if let Some(index) = &*phrases.index_of(&*phrase.read().unwrap()) {
                    //self.model.phrase = index;
                //}
            //}
        //}
    //}

    ///// Focus the editor with the current phrase
    //pub fn edit_phrase (&mut self) {
        //if self.arrangement.selected.is_clip() && self.arrangement.phrase().is_none() {
            //self.phrases.append_new(None, Some(self.next_color().into()));
            //self.arrangement.phrase_put();
        //}
        //self.show_phrase();
        //self.focus(ArrangerFocus::PhraseEditor);
        //self.editor.entered = true;
    //}

    //pub fn next_color (&self) -> ItemColor {
        //if let ArrangerSelection::Clip(track, scene) = self.arrangement.selected {
            //let track_color = self.arrangement.model.tracks[track].color;
            //let scene_color = self.arrangement.model.scenes[scene].color;
            //track_color.mix(scene_color, 0.5).mix(ItemColor::random(), 0.25)
        //} else {
            //panic!("could not compute next color")
        //}
    //}
    //pub fn phrase_del (&mut self) {
        //let track_index = self.selected.track();
        //let scene_index = self.selected.scene();
        //track_index
            //.and_then(|index|self.model.tracks.get_mut(index).map(|track|(index, track)))
            //.map(|(track_index, _)|scene_index
                //.and_then(|index|self.model.scenes.get_mut(index))
                //.map(|scene|scene.clips[track_index] = None));
    //}
    //pub fn phrase_put (&mut self) {
        //if let ArrangerSelection::Clip(track, scene) = self.selected {
            //self.model.scenes[scene].clips[track] = self.selected_phrase().clone();
        //}
    //}
    //pub fn selected_scene (&self) -> Option<&ArrangerScene> {
        //self.selected.scene().map(|s|self.model.scenes.get(s)).flatten()
    //}
    //pub fn selected_scene_mut (&mut self) -> Option<&mut ArrangerScene> {
        //self.selected.scene().map(|s|self.model.scenes.get_mut(s)).flatten()
    //}
    //pub fn selected_phrase (&self) -> Option<Arc<RwLock<Phrase>>> {
        //self.selected_scene()?.clips.get(self.selected.track()?)?.clone()
    //}