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"],
                ["", ",.", "scale rows"],
                ["", "<>", "resize view"],
            ]),
            Self::ArrangementClip => command(&[
                ["",   "g",  "et"],
                ["",   "s",  "et"],
                ["",   "a",  "dd"],
                ["",   "i",  "ns"],
                ["",   "d",  "up"],
                ["",   "e",  "dit"],
                ["",   "c",  "olor"],
                ["re", "n",  "ame"],
                ["",   ",.", "select"],
            ]),
            Self::ArrangementTrack => command(&[
                ["", ",.", "resize"],
                ["", "<>", "move"],
                ["", "i",  "nput"],
                ["", "o",  "utput"],
                ["", "m",  "ute"],
                ["", "s",  "olo"],
            ]),
            Self::PhrasePool => command(&[
                ["",     "a",  "ppend"],
                ["",     "i",  "nsert"],
                ["",     "d",  "uplicate"],
                ["",     "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|{
        for [a, b, c] in commands.iter() {
            add(&row!(" ", widget(a), widget(b).bold(true).fg(Color::Rgb(255,255,0)), widget(c)))?;
        }
        Ok(())
    })
}
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(1))
        })
    }
}
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<Tui>];
        let scenes    = state.scenes.as_ref();
        //panic!("{scenes:#?} {rows:#?}");
        let offset    = 3 + Scene::longest_name(scenes) as u16; // x of 1st track
        let bg        = state.color;
        let clip_bg   = Color::Rgb(40, 50, 30);
        let border_bg = Color::Rgb(40, 50, 30);
        let border_hi = Color::Rgb(100, 110, 40);
        let border_lo = Color::Rgb(70, 80, 50);
        let border_fg = if self.0.focused { border_hi } else { border_lo };
        let border    = Lozenge(Style::default().bg(border_bg).fg(border_fg));
        Layers::new(move |add|{
            let rows: &[(usize, usize)] = rows.as_ref();
            let cols: &[(usize, usize)] = cols.as_ref();

            // column separators
            add(&CustomWidget::new(|_|Ok(Some([0,0])), move|to: &mut TuiOutput|{
                let area  = to.area();
                let style = Some(Style::default().fg(COLOR_SEPARATOR));
                for x in cols.iter().map(|col|col.1) {
                    let x = offset + area.x() + x as u16 - 1;
                    for y in area.y()..area.y2() { to.blit(&"▎", x, y, style); }
                }
                Ok(())
            }))?;

            // row separators
            add(&CustomWidget::new(|_|Ok(Some([0,0])), move|to: &mut TuiOutput|{
                let area = to.area();
                for y in rows.iter().map(|row|row.1) {
                    let y = area.y() + (y / PPQ) as u16 + 1;
                    if y >= to.buffer.area.height { break }
                    for x in area.x()..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;
                        }
                    }
                }
                Ok(())
            }))?;

            // track titles
            let track_titles = row!((track, w) in tracks.iter().zip(cols.iter().map(|col|col.0))=>{
                let name = track.name.read().unwrap();
                let max_w = w.saturating_sub(1).min(name.len()).max(2);
                (&format!("▎{}", &name[0..max_w]).as_str())
                    .min_xy(w as u16, 2)
                    .bg(track.color)
                    .push_x(offset - 1)
            });

            // scene titles
            let scene_name = |scene, playing: bool, height|row!(
                if playing { " ▶" } else { "  " },
                (scene as &Scene).name.read().unwrap().as_str(),
            ).fixed_xy(offset.saturating_sub(1), height);

            // scene clips
            let scene_clip = |scene, track: usize, w: u16, h: u16|Layers::new(move |add|{
                let mut color = clip_bg;
                match (tracks.get(track), (scene as &Scene).clips.get(track)) {
                    (Some(_), 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));
                        add(&name.as_str()[0..max_w].push_x(1).fixed_x(w))?;
                        color = (phrase as &Arc<RwLock<Phrase>>).read().unwrap().color;
                    },
                    _ => {}
                };
                add(&Background(color))
            }).fixed_xy(w, h);

            add(&col!(track_titles, 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))?;
                        // clip per track:
                        for (track, w) in cols.iter().map(|col|col.0).enumerate() {
                            add(&scene_clip(scene, track, w as u16, height))?;
                        }
                        Ok(())
                    }).fixed_y(height)
                }
            )))?;

            // cursor
            add(&CustomWidget::new(|_|Ok(Some([0,0])), move|to: &mut TuiOutput|{
                let area     = to.area();
                let focused  = state.focused;
                let selected = state.selected;
                let get_track_area = |t: usize| [
                    offset + area.x() + cols[t].1 as u16 - 1, area.y(),
                    cols[t].0 as u16, area.h(),
                ];
                let get_scene_area = |s: usize| [
                    area.x(), 2 + area.y() + (rows[s].1 / PPQ) as u16,
                    area.w(), (rows[s].0 / PPQ) as u16
                ];
                let get_clip_area = |t: usize, s: usize| [
                    offset+area.x()+cols[t].1 as u16 - 1, 2+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 => {
                        //if focused { to.fill_bg(area, Color::Rgb(40, 50, 30)); }
                        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));
                }
                if focused {
                    if let Some(clip_area) = clip_area {
                        to.render_in(clip_area, &CORNERS)?;
                        //to.fill_bg(clip_area, Color::Rgb(40, 50, 30));
                    } else if let Some(track_area) = track_area {
                        to.render_in(track_area.clip_h(2u16), &CORNERS)?;
                        //to.fill_bg(track_area, Color::Rgb(40, 50, 30));
                    } else if let Some(scene_area) = scene_area {
                        to.render_in(scene_area.clip_w(offset-1), &CORNERS)?;
                        //to.fill_bg(scene_area, Color::Rgb(40, 50, 30));
                    } else {
                        to.render_in(area.clip_w(offset-1).clip_h(2u16), &CORNERS)?;
                    }
                }
                Ok(())
            }))?;

            Ok(())
        }).bg(bg).grow_y(1).border(border)
    }
}
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;
                    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;
                    }
                    //Ok(Some([x, y, x2, height]))
                    Ok(())
                }),
            )
        )
    }
}