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//! Give an object a margin

use sdl2::pixels::Color;
use sdl2::rect::{Point, Rect};
use sdl2::render::Canvas;
use sdl2::video::Window;

use drawable::{DrawSettings, Drawable, KnownSize, Position, State};

/// A wrapper around a Drawable with KnownSize, giving it a margin on all sides
pub struct Margin<T: Drawable + KnownSize> {
    /// The margin: (top, right, bottom, left)
    pub margin: (u32, u32, u32, u32),
    /// The thing to be marginalized
    pub inner: T,
}

impl<T: Drawable + KnownSize> Margin<T> {
    /// Create a new Margin
    pub fn new(margin: (u32, u32, u32, u32), inner: T) -> Margin<T> {
        Margin { margin, inner }
    }

    /// Create a new Margin with the same top and bottom, as well as the same left and
    /// right
    pub fn new_vert_hor(vertical: u32, horizontal: u32, inner: T) -> Margin<T> {
        Margin {
            margin: (vertical, horizontal, vertical, horizontal),
            inner,
        }
    }
}

impl<T: Drawable + KnownSize> Drawable for Margin<T> {
    fn content(&self) -> Vec<&dyn Drawable> {
        vec![&self.inner]
    }

    fn content_mut(&mut self) -> Vec<&mut dyn Drawable> {
        vec![&mut self.inner]
    }

    fn load(&mut self) {
        self.inner.load();
    }

    fn update(&mut self, dt: f64) {
        self.inner.update(dt);
    }

    fn step(&mut self) {
        self.inner.step()
    }

    fn state(&self) -> State {
        self.inner.state()
    }

    fn draw(&self, canvas: &mut Canvas<Window>, pos: &Position, settings: DrawSettings) {
        match pos {
            Position::Rect(r) => {
                let r2 = Rect::new(
                    r.x() + self.margin.1 as i32,
                    r.y() + self.margin.0 as i32,
                    r.width() - self.margin.1 - self.margin.3,
                    r.height() - self.margin.0 - self.margin.2,
                );

                if settings.notes_view {
                    // TODO: Fewer expects
                    canvas.set_draw_color(Color::RGB(0, 255, 0));
                    canvas.draw_rect(*r).expect("Can't draw");
                    canvas.set_draw_color(Color::RGB(255, 0, 0));
                    canvas.draw_rect(r2).expect("Can't draw");

                    canvas.set_draw_color(Color::RGB(0, 0, 255));

                    let functions: [&dyn for<'r> Fn(&'r Rect) -> Point; 4] = [
                        &Rect::top_left,
                        &Rect::top_right,
                        &Rect::bottom_left,
                        &Rect::bottom_right,
                    ];

                    for f in &functions {
                        let p1 = f(r);
                        let p2 = f(&r2);
                        canvas.draw_line(p2, p1).expect("Can't draw");
                        canvas
                            .draw_line(p2, Point::new((p2.x() + p1.x()) / 2, p2.y()))
                            .expect("Can't draw");
                        canvas
                            .draw_line(p2, Point::new(p2.x(), (p2.y() + p1.y()) / 2))
                            .expect("Can't draw");
                    }
                }

                self.inner.draw(canvas, &Position::Rect(r2), settings);
            }
            _ => {
                self.inner.draw(canvas, pos, settings);
            }
        }
    }
}

impl<T: Drawable + KnownSize> KnownSize for Margin<T> {
    fn width(&self) -> usize {
        self.inner.width() + (self.margin.1 + self.margin.3) as usize
    }

    fn height(&self) -> usize {
        self.inner.height() + (self.margin.0 + self.margin.2) as usize
    }
}