use bevy::{pbr::CascadeShadowConfigBuilder, prelude::*};

use crate::planet::PLANET_RADIUS;

pub const LIGHT_RANGE: f32 = 900.0;

static BLUE: Color = Color::linear_rgb(0.0, 0.0, 1.0);
static PINK: Color = Color::linear_rgb(199.0 / 255.0, 21.0 / 255.0, 113.0 / 255.0);

fn spawn_static_lights(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let pink_light = PointLight {
        intensity: 1_000_000.0,
        range: LIGHT_RANGE,
        color: PINK,
        radius: 1.0,
        shadows_enabled: true,
        ..Default::default()
    };

    let blue_light = PointLight {
        intensity: 1_000_000.0,
        range: LIGHT_RANGE,
        color: BLUE,
        radius: 1.0,
        shadows_enabled: true,
        ..Default::default()
    };

    commands.insert_resource(AmbientLight {
        color: Color::WHITE,
        brightness: 8_000.0,
    });

    let _cascade_shadow_config = CascadeShadowConfigBuilder {
        first_cascade_far_bound: 0.3,
        maximum_distance: 3.0,
        ..default()
    }
    .build();

    // up light
    commands
        .spawn((
            Transform::from_xyz(0.0, PLANET_RADIUS + 30.0, 0.0),
            pink_light,
            Visibility::Visible,
        ))
        .with_children(|builder| {
            builder.spawn((
                Mesh3d(meshes.add(Mesh::from(Sphere::new(10.0)))),
                MeshMaterial3d(materials.add(StandardMaterial {
                    base_color: BLUE,
                    emissive: PINK.into(),
                    ..Default::default()
                })),
                Transform::default(),
                Visibility::Inherited,
            ));
        });
    // down light
    commands
        .spawn((
            Transform::from_xyz(0.0, -PLANET_RADIUS - 30.0, 0.0),
            blue_light,
            Visibility::Visible,
        ))
        .with_children(|builder| {
            builder.spawn((
                Mesh3d(meshes.add(Mesh::from(Sphere::new(10.0)))),
                MeshMaterial3d(materials.add(StandardMaterial {
                    base_color: PINK,
                    emissive: BLUE.into(),
                    ..Default::default()
                })),
                Transform::default(),
                Visibility::Inherited,
            ));
        });
}

pub struct CyberSpaceLightsPlugin;
impl Plugin for CyberSpaceLightsPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(Startup, spawn_static_lights);
    }
}