use crate::*;
/// The standalone arranger consists of transport, clip grid, and sequencer.
impl Content for Arranger<Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        Layers::new(move|add|{
            add(&Stack::down(move|add|{
                add(&self.transport)?;
                let arrangement = &self.arrangement as &dyn Widget<Engine = Tui>;
                if let Some(direction) = self.show_sequencer {
                    let editor  = &self.editor as &dyn Widget<Engine = Tui>;
                    add(&arrangement.split(direction, 20, self.phrases.clone()
                        .split(direction.ccw(), 20, editor)
                        .min_y(20)).fill_y())
                } else {
                    add(&self.arrangement)
                }
            }))?;
            //if let Some(ref modal) = self.modal {
                //add(&Background(COLOR_BG1))?;
                //add(&Foreground(COLOR_BG2))?;
                ////add(modal as &dyn Widget<Engine = Tui>)?;
            //}
            Ok(())
        })
    }
}
/// Handle top-level events in standalone arranger.
impl Handle<Tui> for Arranger<Tui> {
    fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
        if !match self.focused() {
            ArrangerFocus::Transport    => self.transport.handle(from)?,
            ArrangerFocus::PhrasePool   => self.phrases.handle(from)?,
            ArrangerFocus::PhraseEditor => self.editor.handle(from)?,
            ArrangerFocus::Arrangement  => {
                let mut handle_phrase = ||{
                    let result = self.phrases.handle(from);
                    self.arrangement.phrase_put();
                    result
                };
                match from.event() {
                    key!(KeyCode::Char('a')) => handle_phrase()?,
                    key!(KeyCode::Char('c')) => handle_phrase()?,
                    key!(KeyCode::Char('i')) => handle_phrase()?,
                    key!(KeyCode::Char('d')) => handle_phrase()?,
                    _ => self.arrangement.handle(from)?
                }
            },
        }.unwrap_or(false) {
            match from.event() {
                // Tab navigation
                key!(KeyCode::Tab)           => { self.focus_next();  },
                key!(Shift-KeyCode::Tab)     => { self.focus_prev();  },
                key!(KeyCode::BackTab)       => { self.focus_prev();  },
                key!(Shift-KeyCode::BackTab) => { self.focus_prev();  },
                // Directional navigation
                key!(KeyCode::Up)            => { self.focus_up();    },
                key!(KeyCode::Down)          => { self.focus_down();  },
                key!(KeyCode::Left)          => { self.focus_left();  },
                key!(KeyCode::Right)         => { self.focus_right(); },
                // Put selected phrase at position
                key!(KeyCode::Char('s'))     => { self.arrangement.phrase_put(); },
                // Global play/pause binding
                key!(KeyCode::Char(' ')) => match self.transport {
                    Some(ref mut transport) => { transport.write().unwrap().toggle_play()?; },
                    None => { return Ok(None) }
                },
                _ => {}
            }
        };
        Ok(Some(true))
    }
}
impl Arranger<Tui> {
    pub fn rename_selected (&mut self) {
        let Arrangement { selected, ref name, ref tracks, ref scenes, .. } = self.arrangement;
        //self.modal = match selected {
            //ArrangementFocus::Mix => {
                //Some(Box::new(ArrangerRenameModal::new(selected, &*name.read().unwrap())))
            //},
            //ArrangementFocus::Track(t) => {
                //Some(Box::new(ArrangerRenameModal::new(selected, &*tracks[t].name.read().unwrap())))
            //},
            //ArrangementFocus::Scene(s) => {
                //Some(Box::new(ArrangerRenameModal::new(selected, &*scenes[s].name.read().unwrap())))
            //},
            //ArrangementFocus::Clip(t, s) => if let Some(ref clip) = scenes[s].clips[t] {
                //Some(Box::new(ArrangerRenameModal::new(selected, &clip.read().unwrap().name)))
            //} else {
                //None
            //}
        //};
    }
}
impl Handle<Tui> for Arrangement<Tui> {
    fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Char('`'))      => { self.mode.to_next();         },
            key!(KeyCode::Delete)         => { self.delete();               },
            key!(KeyCode::Char('.'))      => { self.increment();            },
            key!(KeyCode::Char(','))      => { self.decrement();            },
            // TODO: next/prev scene
            key!(KeyCode::Enter)          => { self.activate();             },
            key!(Ctrl-KeyCode::Char('a')) => { self.scene_add(None, None)?; },
            key!(Ctrl-KeyCode::Char('t')) => { self.track_add(None, None)?; },
            key!(KeyCode::Char('n'))      => { todo!("rename selected");    },
            key!(KeyCode::Char('l'))      => if let Some(phrase) = self.phrase() {
                phrase.write().unwrap().toggle_loop()
            },
            key!(KeyCode::Up) => {
                match self.mode {
                    ArrangementViewMode::Horizontal => self.track_prev(),
                    _ => self.scene_prev(),
                };
                self.show_phrase();
            },
            key!(KeyCode::Down) => {
                match self.mode {
                    ArrangementViewMode::Horizontal => self.track_next(),
                    _ => self.scene_next(),
                };
                self.show_phrase();
            },
            key!(KeyCode::Left) => {
                match self.mode {
                    ArrangementViewMode::Horizontal => self.scene_prev(),
                    _ => self.track_prev(),
                };
                self.show_phrase();
            },
            key!(KeyCode::Right) => {
                match self.mode {
                    ArrangementViewMode::Horizontal => self.scene_next(),
                    _ => self.track_next(),
                };
                self.show_phrase();
            },
            _ => return Ok(None)
        }
        Ok(Some(true))
    }
}
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))
            }?;
            add(&Align::SE(self.selected.description(
                &self.tracks,
                &self.scenes,
            ).as_str()))
        })
    }
}
impl<'a> Content for VerticalArranger<'a, Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        let Self(state, factor) = self;
        let (cols, rows) = if *factor == 0 {(
            state.track_widths(),
            Scene::ppqs(state.tracks.as_slice(), state.scenes.as_slice()),
        )} else {(
            state.track_widths(),
            (0..=state.scenes.len()).map(|i|(factor*PPQ, factor*PPQ*i)).collect::<Vec<_>>(),
        )};
        //let height = rows.last().map(|(w,y)|(y+w)/PPQ).unwrap_or(16);
        let tracks: &[ArrangementTrack<Tui>] = state.tracks.as_ref();
        let scenes: &[Scene] = state.scenes.as_ref();
        let offset = 3 + Scene::longest_name(scenes) as u16;
        let content = Layers::new(move |add|{
            let rows: &[(usize, usize)] = rows.as_ref();
            let cols: &[(usize, usize)] = cols.as_ref();

            let track_titles = row!((track, (w, _)) in tracks.iter().zip(cols) =>
                (&track.name.read().unwrap().as_str() as &dyn Widget<Engine = Tui>)
                    .min_xy(*w as u16, 2)
                    .bg(track.color)
                    .push_x(offset));

            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);

            let scene_clip = |scene, track: usize, w: u16, h: u16|Layers::new(move |add|{
                let mut color = Color::Rgb(40, 50, 30);
                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);
                        add(&name.as_str().push_x(1).fixed_x(w))?;
                        color = (phrase as &Arc<RwLock<Phrase>>).read().unwrap().color;
                        //if let Some(playing_phrase) = &track.player.phrase {
                            //if *playing_phrase.read().unwrap() == *phrase.read().unwrap() {
                                //color = COLOR_PLAYING
                            //}
                        //}
                    },
                    _ => {}
                };
                add(&Background(color))
            }).fixed_xy(w, h);

            let tracks_clips = col!((scene, (pulses, _)) in scenes.iter().zip(rows) => {
                let height = 1.max((pulses / PPQ) as u16);
                let playing = scene.is_playing(tracks);
                Stack::right(move |add| {
                    add(&scene_name(scene, playing, height).bg(scene.color))?;
                    for (track, (w, _)) in cols.iter().enumerate() {
                        add(&scene_clip(scene, track, *w as u16, height))?;
                    }
                    Ok(())
                }).fixed_y(height)
            });

            add(&VerticalArrangerGrid(offset, &rows, &cols))?;
            add(&VerticalArrangerCursor(state.focused, state.selected, offset, &cols, &rows))?;
            add(&col!(track_titles, tracks_clips))?;
            Ok(())
        })
            .bg(Color::Rgb(28, 35, 25))
            .border(Lozenge(Style::default()
                .bg(Color::Rgb(40, 50, 30))
                .fg(if self.0.focused {
                    Color::Rgb(100, 110, 40)
                } else {
                    Color::Rgb(70, 80, 50)
                })));
        lay!(content, TuiStyle::fg("Session", if self.0.focused {
            Color::Rgb(150, 160, 90)
        } else {
            Color::Rgb(120, 130, 100)
        }).push_x(1))
    }
}
impl<'a> Widget for VerticalArrangerGrid<'a> {
    type Engine = Tui;
    fn render (&self, to: &mut TuiOutput) -> Usually<()> {
        let area = to.area();
        let Self(offset, rows, cols) = self;
        let style = Some(Style::default().fg(COLOR_SEPARATOR));
        for (_, x) in cols.iter() {
            let x = offset + area.x() + *x as u16 - 1;
            for y in area.y()..area.y2() {
                to.blit(&"▎", x, y, style);
            }
        }
        for (_, y) in rows.iter() {
            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(())
    }
}
impl<'a> Widget for VerticalArrangerCursor<'a> {
    type Engine = Tui;
    fn render (&self, to: &mut TuiOutput) -> Usually<()> {
        let area = to.area();
        let Self(focused, selected, offset, cols, rows) = *self;
        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(2), &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));
            }
        }
        Ok(())
    }
}
impl<'a> Content for HorizontalArranger<'a, Tui> {
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        let Arrangement { tracks, focused, selected, scenes, .. } = 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 { tracks, 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(())
                }),
            )
        )
    }
}