use crate::*;
/// Layout for standalone arranger app.
impl Content for Arranger<Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        Split::down(
            1,
            widget(&self.transport),
            Split::up(
                1,
                widget(&self.status),
                Split::down(
                    self.arrangement_split,
                    widget(&self.arrangement),
                    Split::right(
                        self.phrases_split,
                        self.phrases.clone(),
                        widget(&self.editor),
                    )
                )
            )
        )
    }
}
impl Content for ArrangerStatusBar {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        let label = match self {
            Self::Transport        => "TRANSPORT",
            Self::ArrangementMix   => "PROJECT",
            Self::ArrangementTrack => "TRACK",
            Self::ArrangementScene => "SCENE",
            Self::ArrangementClip  => "CLIP",
            Self::PhrasePool       => "SEQ LIST",
            Self::PhraseView       => "VIEW SEQ",
            Self::PhraseEdit       => "EDIT SEQ",
        };
        let mode = TuiStyle::bg(format!(" {label} "), Color::Rgb(150, 160, 90))
            .fg(Color::Rgb(0, 0, 0))
            .bold(true);
        let commands = match self {
            Self::ArrangementMix => command(&[
                ["", "c",     "olor"],
                ["", "<>",    "resize"],
                ["", "+-",    "zoom"],
                ["", "n",     "ame/number"],
                ["", "Enter", " stop all"],
            ]),
            Self::ArrangementClip => command(&[
                ["",   "g",    "et"],
                ["",   "s",    "et"],
                ["",   "a",    "dd"],
                ["",   "i",    "ns"],
                ["",   "d",    "up"],
                ["",   "e",    "dit"],
                ["",   "c",    "olor"],
                ["re", "n",    "ame"],
                ["",   ",.",   "select"],
                ["", "Enter",  " launch"],
            ]),
            Self::ArrangementTrack => command(&[
                ["re", "n",     "ame"],
                ["",   ",.",    "resize"],
                ["",   "<>",    "move"],
                ["",   "i",     "nput"],
                ["",   "o",     "utput"],
                ["",   "m",     "ute"],
                ["",   "s",     "olo"],
                ["",   "Del",   "ete"],
                ["",   "Enter", " stop"],
            ]),
            Self::ArrangementScene => command(&[
                ["re", "n",     "ame"],
                ["",   "Del",   "ete"],
                ["",   "Enter", " launch"],
            ]),
            Self::PhrasePool => command(&[
                ["",     "a",   "ppend"],
                ["",     "i",   "nsert"],
                ["",     "d",   "uplicate"],
                ["",     "Del", "ete"],
                ["",     "c",   "olor"],
                ["re",   "n",   "ame"],
                ["leng", "t",   "h"],
                ["",     ",.",  "move"],
                ["",     "+-",  "resize view"],
            ]),
            Self::PhraseView => command(&[
                ["", "enter",            " edit"],
                ["", "arrows/pgup/pgdn", " scroll"],
                ["", "+=",               "zoom"],
            ]),
            Self::PhraseEdit => command(&[
                ["", "esc", " exit"],
                ["", "a",   "ppend"],
                ["", "s",   "et"],
                ["", "][",  "length"],
                ["", "+-",  "zoom"],
            ]),
            _ => command(&[])
        };
        //let commands = commands.iter().reduce(String::new(), |s, (a, b, c)| format!("{s} {a}{b}{c}"));
        row!(mode, commands)
    }
}
fn command (commands: &[[impl Widget<Engine = Tui>;3]]) -> impl Widget<Engine = Tui> + '_ {
    Stack::right(|add|{
        Ok(for [a, b, c] in commands.iter() {
            add(&row!(" ", widget(a), widget(b).bold(true).fg(Color::Rgb(255,255,0)), widget(c)))?;
        })
    })
}
impl Content for Arrangement<Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        Layers::new(move |add|{
            match self.mode {
                ArrangementViewMode::Horizontal       => add(&HorizontalArranger(&self)),
                ArrangementViewMode::Vertical(factor) => add(&VerticalArranger(&self, factor)),
            }?;
            let color = if self.focused{Color::Rgb(150, 160, 90)}else{Color::Rgb(120, 130, 100)};
            add(&TuiStyle::fg("Session", color).push_x(2))?;
            add(&self.size)
        })
    }
}
impl<'a> Content for VerticalArranger<'a, Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        let Self(state, factor) = self;
        let cols          = state.track_widths();
        let rows          = Scene::ppqs(state.scenes.as_slice(), *factor);
        let tracks        = state.tracks.as_ref() as &[ArrangementTrack];
        let scenes        = state.scenes.as_ref();
        let bg            = state.color;
        let clip_bg       = Color::Rgb(40, 50, 30);
        let border_hi     = Color::Rgb(100, 110, 40);
        let border_lo     = Color::Rgb(70, 80, 50);
        //let border_bg     = Color::Rgb(40, 50, 30);
        //let border_fg     = if self.0.focused { border_hi } else { border_lo };
        //let border        = Lozenge(Style::default().bg(border_bg).fg(border_fg));
        let track_title_h = 2u16;
        let tracks_footer = 3u16;
        let scene_title_w = 3 + Scene::longest_name(scenes) as u16; // x of 1st track
        let clock         = &self.0.clock;
        let arrangement   = Layers::new(move |add|{
            let rows: &[(usize, usize)] = rows.as_ref();
            let cols: &[(usize, usize)] = cols.as_ref();
            let any_size = |_|Ok(Some([0,0]));
            // column separators
            add(&CustomWidget::new(any_size, move|to: &mut TuiOutput|{
                let style = Some(Style::default().fg(COLOR_SEPARATOR));
                Ok(for x in cols.iter().map(|col|col.1) {
                    let x = scene_title_w + to.area().x() + x as u16;
                    for y in to.area().y()..to.area().y2() { to.blit(&"▎", x, y, style); }
                })
            }))?;
            // row separators
            add(&CustomWidget::new(any_size, move|to: &mut TuiOutput|{
                Ok(for y in rows.iter().map(|row|row.1) {
                    let y = to.area().y() + (y / PPQ) as u16 + 1;
                    if y >= to.buffer.area.height { break }
                    for x in to.area().x()..to.area().x2().saturating_sub(2) {
                        if x < to.buffer.area.x && y < to.buffer.area.y {
                            let cell = to.buffer.get_mut(x, y);
                            cell.modifier = Modifier::UNDERLINED;
                            cell.underline_color = COLOR_SEPARATOR;
                        }
                    }
                })
            }))?;
            // track titles
            let header = row!((track, w) in tracks.iter().zip(cols.iter().map(|col|col.0))=>{
                // name and width of track
                let name  = track.name.read().unwrap();
                let max_w = w.saturating_sub(1).min(name.len()).max(2);
                let name  = format!("▎{}", &name[0..max_w]);
                let name  = TuiStyle::bold(name, true);
                // name of active MIDI input
                let input = format!("▎>{}", track.player.midi_inputs.get(0)
                    .map(|port|port.short_name())
                    .transpose()?
                    .unwrap_or("(none)".into()));
                col!(name, input)
                    .min_xy(w as u16, track_title_h)
                    .bg(track.color.rgb)
                    .push_x(scene_title_w)
            });
            // track controls
            let footer = row!((track, w) in tracks.iter().zip(cols.iter().map(|col|col.0))=>{
                let player = &track.player;
                // beats elapsed
                let elapsed = if let Some((_, Some(phrase))) = player.phrase.as_ref() {
                    let length  = phrase.read().unwrap().length;
                    let elapsed = player.pulses_since_start().unwrap();
                    let elapsed = clock.timebase().format_beats_1_short(
                        (elapsed as usize % length) as f64
                    );
                    format!("▎+{elapsed:>}")
                } else {
                    String::from("▎")
                };
                // beats until switchover
                let until_next = player.next_phrase.as_ref()
                    .map(|(t, _)|{
                        let target  = t.pulse.get();
                        let current = clock.current.pulse.get();
                        if target > current {
                            let remaining = target - current;
                            format!("▎-{:>}", clock.timebase().format_beats_0_short(remaining))
                        } else {
                            String::new()
                        }
                    })
                    .unwrap_or(String::from("▎"));
                // name of active MIDI output
                let output = format!("▎<{}", track.player.midi_outputs.get(0)
                    .map(|port|port.short_name())
                    .transpose()?
                    .unwrap_or("(none)".into()));
                col!(until_next, elapsed, output)
                    .min_xy(w as u16, tracks_footer)
                    .bg(track.color.rgb)
                    .push_x(scene_title_w)
            });
            // scene titles
            let scene_name = |scene, playing: bool, height|row!(
                if playing { "▶ " } else { "  " },
                TuiStyle::bold((scene as &Scene).name.read().unwrap().as_str(), true),
            ).fixed_xy(scene_title_w, height);
            // scene clips
            let scene_clip = |scene, track: usize, w: u16, h: u16|Layers::new(move |add|{
                let mut bg = clip_bg;
                match (tracks.get(track), (scene as &Scene).clips.get(track)) {
                    (Some(track), Some(Some(phrase))) => {
                        let name = &(phrase as &Arc<RwLock<Phrase>>).read().unwrap().name;
                        let name = format!("{}", name);
                        let max_w = name.len().min((w as usize).saturating_sub(2));
                        let color = phrase.read().unwrap().color;
                        add(&name.as_str()[0..max_w].push_x(1).fixed_x(w))?;
                        bg = if let Some((_, Some(ref playing))) = track.player.phrase {
                            if *playing.read().unwrap() == *phrase.read().unwrap() {
                                color.light.rgb
                            } else {
                                color.dark.rgb
                            }
                        } else {
                            color.dark.rgb
                        };
                    },
                    _ => {}
                };
                add(&Background(bg))
            }).fixed_xy(w, h);
            // tracks and scenes
            let content = col!(
                // scenes:
                (scene, pulses) in scenes.iter().zip(rows.iter().map(|row|row.0)) => {
                    let height = 1.max((pulses / PPQ) as u16);
                    let playing = scene.is_playing(tracks);
                    Stack::right(move |add| {
                        // scene title:
                        add(&scene_name(scene, playing, height).bg(scene.color.rgb))?;
                        // clip per track:
                        Ok(for (track, w) in cols.iter().map(|col|col.0).enumerate() {
                            add(&scene_clip(scene, track, w as u16, height))?;
                        })
                    }).fixed_y(height)
                }
            ).fixed_y((self.0.size.h() as u16).saturating_sub(track_title_h + tracks_footer));
            // full grid with header and footer
            add(&col!(header, content, footer))?;
            // cursor
            add(&CustomWidget::new(any_size, move|to: &mut TuiOutput|{
                let area     = to.area();
                let focused  = state.focused;
                let selected = state.selected;
                let get_track_area = |t: usize| [
                    scene_title_w + area.x() + cols[t].1 as u16, area.y(),
                    cols[t].0 as u16, area.h(),
                ];
                let get_scene_area = |s: usize| [
                    area.x(), track_title_h + area.y() + (rows[s].1 / PPQ) as u16,
                    area.w(), (rows[s].0 / PPQ) as u16
                ];
                let get_clip_area = |t: usize, s: usize| [
                    scene_title_w + area.x() + cols[t].1 as u16,
                    track_title_h + area.y() + (rows[s].1/PPQ) as u16,
                    cols[t].0 as u16,
                    (rows[s].0 / PPQ) as u16
                ];
                let mut track_area: Option<[u16;4]> = None;
                let mut scene_area: Option<[u16;4]> = None;
                let mut clip_area:  Option<[u16;4]> = None;
                let area = match selected {
                    ArrangementFocus::Mix => area,
                    ArrangementFocus::Track(t) => { track_area = Some(get_track_area(t)); area },
                    ArrangementFocus::Scene(s) => { scene_area = Some(get_scene_area(s)); area },
                    ArrangementFocus::Clip(t, s) => {
                        track_area = Some(get_track_area(t));
                        scene_area = Some(get_scene_area(s));
                        clip_area  = Some(get_clip_area(t, s));
                        area
                    },
                };
                if let Some([x, y, width, height]) = track_area {
                    to.fill_fg([x,         y, 1, height], Color::Rgb(70, 80, 50));
                    to.fill_fg([x + width, y, 1, height], Color::Rgb(70, 80, 50));
                }
                if let Some([_, y, _, height]) = scene_area {
                    to.fill_ul([area.x(), y - 1,          area.w(), 1], Color::Rgb(70, 80, 50));
                    to.fill_ul([area.x(), y + height - 1, area.w(), 1], Color::Rgb(70, 80, 50));
                }
                Ok(if focused {
                    to.render_in(if let Some(clip_area) = clip_area { clip_area }
                    else if let Some(track_area) = track_area { track_area.clip_h(track_title_h) }
                    else if let Some(scene_area) = scene_area { scene_area.clip_w(scene_title_w) }
                    else { area.clip_w(scene_title_w).clip_h(track_title_h) }, &CORNERS)?
                })
            }))
        }).bg(bg.rgb);//.grow_y(1);//.border(border);
        let color = if self.0.focused {Color::Rgb(150, 160, 90)} else {Color::Rgb(120, 130, 100)};
        let size  = format!("{}x{}", self.0.size.w(), self.0.size.h());
        let lower_right = TuiStyle::fg(size, color).pull_x(1).align_se().fill_xy();
        lay!(arrangement, lower_right)
    }
}
impl<'a> Content for HorizontalArranger<'a, Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        let Arrangement { tracks, focused, .. } = self.0;
        let _tracks = tracks.as_slice();
        lay!(
            focused.then_some(Background(Color::Rgb(40, 50, 30))),
            row!(
                // name
                CustomWidget::new(|_|{
                    todo!()
                }, |_: &mut TuiOutput|{
                    todo!()
                    //let Self(tracks, selected) = self;
                    //let yellow = Some(Style::default().yellow().bold().not_dim());
                    //let white  = Some(Style::default().white().bold().not_dim());
                    //let area = to.area();
                    //let area = [area.x(), area.y(), 3 + 5.max(track_name_max_len(tracks)) as u16, area.h()];
                    //let offset = 0; // track scroll offset
                    //for y in 0..area.h() {
                        //if y == 0 {
                            //to.blit(&"Mixer", area.x() + 1, area.y() + y, Some(DIM))?;
                        //} else if y % 2 == 0 {
                            //let index = (y as usize - 2) / 2 + offset;
                            //if let Some(track) = tracks.get(index) {
                                //let selected = selected.track() == Some(index);
                                //let style = if selected { yellow } else { white };
                                //to.blit(&format!(" {index:>02} "), area.x(), area.y() + y, style)?;
                                //to.blit(&*track.name.read().unwrap(), area.x() + 4, area.y() + y, style)?;
                            //}
                        //}
                    //}
                    //Ok(Some(area))
                }),
                // monitor
                CustomWidget::new(|_|{
                    todo!()
                }, |_: &mut TuiOutput|{
                    todo!()
                    //let Self(tracks) = self;
                    //let mut area = to.area();
                    //let on  = Some(Style::default().not_dim().green().bold());
                    //let off = Some(DIM);
                    //area.x += 1;
                    //for y in 0..area.h() {
                        //if y == 0 {
                            ////" MON ".blit(to.buffer, area.x, area.y + y, style2)?;
                        //} else if y % 2 == 0 {
                            //let index = (y as usize - 2) / 2;
                            //if let Some(track) = tracks.get(index) {
                                //let style = if track.monitoring { on } else { off };
                                //to.blit(&" MON ", area.x(), area.y() + y, style)?;
                            //} else {
                                //area.height = y;
                                //break
                            //}
                        //}
                    //}
                    //area.width = 4;
                    //Ok(Some(area))
                }),
                // record
                CustomWidget::new(|_|{
                    todo!()
                }, |_: &mut TuiOutput|{
                    todo!()
                    //let Self(tracks) = self;
                    //let mut area = to.area();
                    //let on  = Some(Style::default().not_dim().red().bold());
                    //let off = Some(Style::default().dim());
                    //area.x += 1;
                    //for y in 0..area.h() {
                        //if y == 0 {
                            ////" REC ".blit(to.buffer, area.x, area.y + y, style2)?;
                        //} else if y % 2 == 0 {
                            //let index = (y as usize - 2) / 2;
                            //if let Some(track) = tracks.get(index) {
                                //let style = if track.recording { on } else { off };
                                //to.blit(&" REC ", area.x(), area.y() + y, style)?;
                            //} else {
                                //area.height = y;
                                //break
                            //}
                        //}
                    //}
                    //area.width = 4;
                    //Ok(Some(area))
                }),
                // overdub
                CustomWidget::new(|_|{
                    todo!()
                }, |_: &mut TuiOutput|{
                    todo!()
                    //let Self(tracks) = self;
                    //let mut area = to.area();
                    //let on  = Some(Style::default().not_dim().yellow().bold());
                    //let off = Some(Style::default().dim());
                    //area.x = area.x + 1;
                    //for y in 0..area.h() {
                        //if y == 0 {
                            ////" OVR ".blit(to.buffer, area.x, area.y + y, style2)?;
                        //} else if y % 2 == 0 {
                            //let index = (y as usize - 2) / 2;
                            //if let Some(track) = tracks.get(index) {
                                //to.blit(&" OVR ", area.x(), area.y() + y, if track.overdub {
                                    //on
                                //} else {
                                    //off
                                //})?;
                            //} else {
                                //area.height = y;
                                //break
                            //}
                        //}
                    //}
                    //area.width = 4;
                    //Ok(Some(area))
                }),
                // erase
                CustomWidget::new(|_|{
                    todo!()
                }, |_: &mut TuiOutput|{
                    todo!()
                    //let Self(tracks) = self;
                    //let mut area = to.area();
                    //let off = Some(Style::default().dim());
                    //area.x = area.x + 1;
                    //for y in 0..area.h() {
                        //if y == 0 {
                            ////" DEL ".blit(to.buffer, area.x, area.y + y, style2)?;
                        //} else if y % 2 == 0 {
                            //let index = (y as usize - 2) / 2;
                            //if let Some(_) = tracks.get(index) {
                                //to.blit(&" DEL ", area.x(), area.y() + y, off)?;
                            //} else {
                                //area.height = y;
                                //break
                            //}
                        //}
                    //}
                    //area.width = 4;
                    //Ok(Some(area))
                }),
                // gain
                CustomWidget::new(|_|{
                    todo!()
                }, |_: &mut TuiOutput|{
                    todo!()
                    //let Self(tracks) = self;
                    //let mut area = to.area();
                    //let off = Some(Style::default().dim());
                    //area.x = area.x() + 1;
                    //for y in 0..area.h() {
                        //if y == 0 {
                            ////" GAIN ".blit(to.buffer, area.x, area.y + y, style2)?;
                        //} else if y % 2 == 0 {
                            //let index = (y as usize - 2) / 2;
                            //if let Some(_) = tracks.get(index) {
                                //to.blit(&" +0.0 ", area.x(), area.y() + y, off)?;
                            //} else {
                                //area.height = y;
                                //break
                            //}
                        //}
                    //}
                    //area.width = 7;
                    //Ok(Some(area))
                }),
                // scenes
                CustomWidget::new(|_|{
                    todo!()
                }, |to: &mut TuiOutput|{
                    let Arrangement { scenes, selected, .. } = self.0;
                    let area = to.area();
                    let mut x2 = 0;
                    let [x, y, _, height] = area;
                    Ok(for (scene_index, scene) in scenes.iter().enumerate() {
                        let active_scene = selected.scene() == Some(scene_index);
                        let sep = Some(if active_scene {
                            Style::default().yellow().not_dim()
                        } else {
                            Style::default().dim()
                        });
                        for y in y+1..y+height {
                            to.blit(&"│", x + x2, y, sep);
                        }
                        let name = scene.name.read().unwrap();
                        let mut x3 = name.len() as u16;
                        to.blit(&*name, x + x2, y, sep);
                        for (i, clip) in scene.clips.iter().enumerate() {
                            let active_track = selected.track() == Some(i);
                            if let Some(clip) = clip {
                                let y2 = y + 2 + i as u16 * 2;
                                let label = format!("{}", clip.read().unwrap().name);
                                to.blit(&label, x + x2, y2, Some(if active_track && active_scene {
                                    Style::default().not_dim().yellow().bold()
                                } else {
                                    Style::default().not_dim()
                                }));
                                x3 = x3.max(label.len() as u16)
                            }
                        }
                        x2 = x2 + x3 + 1;
                    })
                }),
            )
        )
    }
}