use crate::physics::Cartesian;
use crate::physics::PhysBody;
use crate::DrawContext;
use crate::Drawable;
use crate::SpriteAtlas;

pub enum ShipKind {
	Gypsum,
}

impl ShipKind {
	fn sprite(&self) -> &'static str {
		match self {
			Self::Gypsum => "gypsum.png",
		}
	}
}

pub struct Ship {
	pub body: PhysBody,
	kind: ShipKind,
}

impl Ship {
	pub fn new(kind: ShipKind, pos: Cartesian) -> Self {
		Ship {
			body: PhysBody::new(pos),
			kind,
		}
	}

	/// Get the position of this drawable on the screen
	/// (0, 0) is at top-left corner.
	///
	/// Returned position is this object's center.
	fn screen_position(&self, dc: &DrawContext) -> Cartesian {
		return ((self.body.pos - dc.camera.pos) - dc.top_left) * Cartesian::new(1.0, -1.0);
	}
}

impl Drawable for Ship {
	fn draw(&self, dc: &mut DrawContext, sa: &SpriteAtlas) -> Result<(), String> {
		let pos = self.screen_position(dc);
		let sprite = sa.get(self.kind.sprite());
		sprite.draw(dc.canvas, pos, self.body.angle.to_degrees(), 1.0)?;
		return Ok(());
	}
}