use crate::{core::*, model::*, view::*};

pub struct ChainView<'a> {
    pub track:     Option<&'a Track>,
    pub direction: Direction,
    pub focused:   bool,
    pub entered:   bool,
}

impl<'a> ChainView<'a> {
    pub fn horizontal (app: &'a App) -> Self {
        Self::new(app, Direction::Right)
    }
    pub fn vertical (app: &'a App) -> Self {
        Self::new(app, Direction::Down)
    }
    pub fn new (app: &'a App, direction: Direction) -> Self {
        Self {
            direction,
            entered:  app.entered,
            focused:  app.section == AppFocus::Chain,
            track:    match app.track_cursor {
                0 => None,
                _ => app.tracks.get(app.track_cursor - 1)
            },
        }
    }
}

impl<'a> Render for ChainView<'a> {
    fn render (&self, buf: &mut Buffer, mut area: Rect) -> Usually<Rect> {
        if let Some(track) = self.track {
            match self.direction {
                Direction::Down  => area.width = area.width.min(40),
                Direction::Right => area.width = area.width.min(10),
            }
            fill_bg(buf, area, Nord::bg_lo(self.focused, self.entered));
            let area = self.direction
                .split_focus(0, track.devices.as_slice(), if self.focused {
                    Style::default().green().dim()
                } else {
                    Style::default().dim()
                })
                .render(buf, area)?;
            if self.focused && self.entered {
                Corners(Style::default().green().not_dim()).draw(buf, area)?;
            }
            Ok(area)
        } else {
            let Rect { x, y, width, height } = area;
            let label = "No track selected";
            let x = x + (width - label.len() as u16) / 2;
            let y = y + height / 2;
            label.blit(buf, x, y, Some(Style::default().dim().bold()))?;
            Ok(area)
        }
    }
}