use flecs::*;

// TODO
// - Add Generic component API to Systems

#[derive(Copy, Clone, Default, Debug, PartialEq)]
struct Position {
	x: f32,
	y: f32,
}

#[derive(Copy, Clone, Default, Debug, PartialEq)]
struct Velocity {
	x: f32,
	y: f32,
}

// Tag types
struct Eats {}
struct Apples {}

fn main() {
	println!("Hello World starting...");

	let mut world = World::new();

	// We have to manually register all components
	world.component_named::<Position>("Position");
	world.component_named::<Velocity>("Velocity");
	world.component::<Eats>();
	world.component::<Apples>();

	world.system().with_components::<(Position, Velocity)>().each::<(Position, Velocity)>(
		|e, (pos, vel)| {
			println!("  {}: {:?}, {:?}", e.name(), pos, vel);
		},
	);

	// Create an entity with name Bob, add Position and food preference
	let bob = world
		.entity()
		.named("Bob")
		.set(Position { x: 0.0, y: 0.0 })
		.set(Velocity { x: 1.0, y: 2.0 })
		.add_relation::<Eats, Apples>();

	// Show us what you got
	println!("{}'s got: [ {} ]", bob.name(), bob.type_info().to_str());

	// Run systems twice. Usually this function is called once per frame
	world.progress(0.033);
	world.progress(0.033);

	// See if Bob has moved (he has)
	let p = bob.get::<Position>();
	println!("Bob's position is {{ {}, {} }}", p.x, p.y);
}

#[cfg(test)]
mod tests {
	#[test]
	fn flecs_hello_world() {
		super::main();
	}
}