pub struct HikariSettings {
    /// The interval of frames between sample validation passes.
    pub direct_validate_interval: usize,
    /// The interval of frames between sample validation passes.
    pub emissive_validate_interval: usize,
    /// Temporal reservoir sample count is capped by this value.
    pub max_temporal_reuse_count: usize,
    /// Spatial reservoir sample count is capped by this value.
    pub max_spatial_reuse_count: usize,
    /// Max lifetime of a reservoir sample before being replaced with new one.
    pub max_reservoir_lifetime: f32,
    /// Half angle of the solar cone apex in radians.
    pub solar_angle: f32,
    /// Count of indirect bounces.
    pub indirect_bounces: usize,
    /// Threshold for the indirect luminance to reduce fireflies.
    pub max_indirect_luminance: f32,
    /// Clear color override.
    pub clear_color: Color,
    /// Whether to do temporal sample reuse in ReSTIR.
    pub temporal_reuse: bool,
    /// Whether to do spatial sample reuse for emissive lighting in ReSTIR.
    pub emissive_spatial_reuse: bool,
    /// Whether to do spatial sample reuse for indirect lighting in ReSTIR.
    pub indirect_spatial_reuse: bool,
    /// Whether to do noise filtering.
    pub denoise: bool,
    /// Which temporal filtering implementation to use.
    pub taa: Taa,
    /// Which upscaling implementation to use.
    pub upscale: Upscale,
}

use bevy::prelude::*;
use bevy_hikari::prelude::*;
use std::f32::consts::PI;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugin(HikariPlugin {
            remove_main_pass: true,
        })
        .add_startup_system(setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
    _asset_server: Res<AssetServer>,
) {
    // Plane
    commands.spawn(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
        material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
        ..default()
    });
    // Cube
    commands.spawn(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(0.0, 0.5, 0.0),
        ..default()
    });

    // Only directional light is supported
    commands.spawn(DirectionalLightBundle {
        directional_light: DirectionalLight {
            illuminance: 10000.0,
            ..Default::default()
        },
        transform: Transform {
            translation: Vec3::new(0.0, 5.0, 0.0),
            rotation: Quat::from_euler(EulerRot::XYZ, -PI / 4.0, PI / 4.0, 0.0),
            ..Default::default()
        },
        ..Default::default()
    });

    // Camera
    commands.spawn((
        Camera3dBundle {
            // Set `camera_render_graph`
            camera_render_graph: CameraRenderGraph::new(bevy_hikari::graph::NAME),
            transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
            ..Default::default()
        },
        // Add [`HikariSettings`] component to enable GI rendering
        HikariSettings::default(),
    ));
}