use crate::{
	activities::{house, overworld, Activity},
	State
};
use comfy::EngineContext;
use std::ops::Sub;

#[repr(i32)]
pub enum ZLayer {
	MapMax = -1,
	Human = 0,
	Ghost = 1
}

impl From<ZLayer> for i32 {
	fn from(value: ZLayer) -> Self {
		// safe because #[repr(i32)]
		value as i32
	}
}

impl Sub<i32> for ZLayer {
	type Output = i32;

	fn sub(self, other: i32) -> Self::Output {
		i32::from(self) - other
	}
}

pub fn update(state: &mut State, engine: &mut EngineContext<'_>) {
	match state.activity {
		Activity::House => house::update(state, engine),
		Activity::Overworld => overworld::update(state, engine)
	}
}

pub fn draw(state: &State, engine: &EngineContext<'_>) {
	match state.activity {
		Activity::House => house::draw(state, engine),
		Activity::Overworld => overworld::draw(state, engine)
	}
}