use bevy::prelude::*;

fn main() {
    App::build().add_defaults().setup_world(setup).run();
}

fn setup(world: &mut World, resources: &mut Resources) {
    let mut mesh_storage = resources.get_mut::<AssetStorage<Mesh>>().unwrap();
    let cube_handle = mesh_storage.add(Mesh::load(MeshType::Cube));

    let mut texture_storage = resources.get_mut::<AssetStorage<Texture>>().unwrap();
    let texture = Texture::load(TextureType::Png(
        concat!(env!("CARGO_MANIFEST_DIR"), "/assets/bevy_logo_dark.png").to_string(),
    ));
    let texture_handle = texture_storage.add(texture);

    let mut material_storage = resources
        .get_mut::<AssetStorage<StandardMaterial>>()
        .unwrap();

    let cube_material_handle = material_storage.add(StandardMaterial {
        albedo_texture: Some(texture_handle),
        ..Default::default()
    });

    let modulated_cube_material_handle = material_storage.add(StandardMaterial {
        albedo: Color::rgba(1.0, 0.0, 0.0, 0.5),
        albedo_texture: Some(texture_handle),
        ..Default::default()
    });

    world
        .build()
        // cube
        .add_entity(MeshEntity {
            mesh: cube_handle,
            material: cube_material_handle,
            translation: Translation::new(1.0, 0.0, 0.0),
            ..Default::default()
        })
        // cube modulated
        .add_entity(MeshEntity {
            mesh: cube_handle,
            material: modulated_cube_material_handle,
            translation: Translation::new(-1.0, 0.0, 0.0),
            ..Default::default()
        })
        // light
        .add_entity(LightEntity {
            translation: Translation::new(4.0, 4.0, 5.0),
            ..Default::default()
        })
        // camera
        .add_entity(CameraEntity {
            local_to_world: LocalToWorld(Mat4::look_at_rh(
                Vec3::new(3.0, 8.0, 5.0),
                Vec3::new(0.0, 0.0, 0.0),
                Vec3::new(0.0, 0.0, 1.0),
            )),
            ..Default::default()
        })
        .build();
}