use bevy::{
    ecs::prelude::*,
    math::Vec3,
    pbr2::{PbrBundle, PointLightBundle, StandardMaterial},
    prelude::{App, Assets, Transform},
    render2::{
        camera::OrthographicCameraBundle,
        color::Color,
        mesh::{shape, Mesh},
    },
    PipelinedDefaultPlugins,
};

fn main() {
    App::new()
        .add_plugins(PipelinedDefaultPlugins)
        .add_startup_system(setup.system())
        .run();
}

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // set up the camera
    let mut camera = OrthographicCameraBundle::new_3d();
    camera.orthographic_projection.scale = 3.0;
    camera.transform = Transform::from_xyz(5.0, 5.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y);

    // camera
    commands.spawn_bundle(camera);

    // plane
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
        material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
        ..Default::default()
    });
    // cubes
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(1.5, 0.5, 1.5),
        ..Default::default()
    });
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(1.5, 0.5, -1.5),
        ..Default::default()
    });
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(-1.5, 0.5, 1.5),
        ..Default::default()
    });
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(-1.5, 0.5, -1.5),
        ..Default::default()
    });
    // light
    commands.spawn_bundle(PointLightBundle {
        transform: Transform::from_xyz(3.0, 8.0, 5.0),
        ..Default::default()
    });
}