use bevy::{input::system::exit_on_esc_system, pbr::AmbientLight, prelude::*};

mod light_balls;
use light_balls::*;
mod player;
use player::*;
mod columns;
use columns::*;

fn main() {
    App::build()
        .insert_resource(Msaa { samples: 4 })
        .add_plugins(DefaultPlugins)
        .init_resource::<LightBallMaterials>()
        .add_startup_system(setup.system())
        .add_system(exit_on_esc_system.system())
        .add_system(light_movement.system())
        .add_system(move_player.system())
        .add_system(camera_follow_player.system())
        .add_system(light_up_ball_when_close_to_player.system())
        .run();
}

pub struct Camera;

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
    mut ambient: ResMut<AmbientLight>,
    light_ball_materials: Res<LightBallMaterials>,
) {
    // set ambient light to 0
    ambient.color = Color::rgb(0.3, 0.3, 0.3);
    ambient.brightness = 0.02;

    // floor
    let mut floor_material: StandardMaterial = Color::rgb(0.1, 0.1, 0.1).into();
    floor_material.metallic = 0.0;
    floor_material.reflectance = 0.0;
    let floor_material = materials.add(floor_material);
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Plane { size: 10000.0 })),
        material: floor_material,
        ..Default::default()
    });

    // columns
    spawn_columns(&mut commands, &mut meshes, &mut materials);

    // player
    spawn_player(&mut commands, &mut meshes, &mut materials);

    // light balls
    for i in 1..10 {
        spawn_light_ball(
            &mut commands,
            &light_ball_materials,
            Vec3::new(i as f32 * 30.0, 2.0, 6.0),
        );
        spawn_light_ball(
            &mut commands,
            &light_ball_materials,
            Vec3::new(i as f32 * 30.0, 2.0, -6.0),
        );
    }

    // camera
    commands
        .spawn_bundle(PerspectiveCameraBundle {
            transform: Transform::from_xyz(-20.0, 100.0, 50.0).looking_at(Vec3::ZERO, Vec3::Y),
            ..Default::default()
        })
        .insert(Camera);
}