use bevy::prelude::*;
use bevy_inspector_egui::WorldInspectorPlugin;
use cyber_rider::flycam::{MovementSettings, PlayerPlugin};

// stolen with neither shame nor pity from
// git@github.com:sburris0/bevy_flycam.git, b90f6fc, which is copyright 2020
// Spencer Burris

fn main() {
    App::build()
        .insert_resource(Msaa { samples: 4 })
        .add_plugins(DefaultPlugins)
        .add_plugin(PlayerPlugin)
        .add_plugin(WorldInspectorPlugin::new())
        .insert_resource(MovementSettings {
            sensitivity: 0.00015, // default: 0.00012
            speed: 12.0,          // default: 12.0
        })
        .add_startup_system(setup.system())
        .add_system(animate_lights.system())
        .run();
}

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let red_light = Light {
        intensity: 50_000.0,
        range: 1800.0,
        color: Color::RED,
        ..Default::default()
    };

    let blue_light = Light {
        intensity: 50_000.0,
        range: 1800.0,
        color: Color::BLUE,
        ..Default::default()
    };

    let purple_light = Light {
        intensity: 50_000.0,
        range: 1800.0,
        color: Color::PURPLE,
        ..Default::default()
    };

    // world
    commands.spawn_bundle(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Icosphere {
            radius: 300.0,
            subdivisions: 5,
        })),
        material: materials.add(StandardMaterial {
            base_color: Color::GRAY,
            metallic: 0.7,
            roughness: 0.2,
            ..Default::default()
        }),

        ..Default::default()
    });
    // east light
    commands.spawn_bundle(LightBundle {
        transform: Transform::from_xyz(750.0, 0.0, 0.0),
        light: purple_light.clone(),
        ..Default::default()
    });
    // west light
    commands.spawn_bundle(LightBundle {
        transform: Transform::from_xyz(-750.0, 0.0, 0.0),
        light: purple_light.clone(),
        ..Default::default()
    });
    // north light
    commands.spawn_bundle(LightBundle {
        transform: Transform::from_xyz(0.0, 0.0, 750.0),
        light: purple_light.clone(),
        ..Default::default()
    });
    // south light
    commands.spawn_bundle(LightBundle {
        transform: Transform::from_xyz(0.0, 0.0, -750.0),
        light: purple_light,
        ..Default::default()
    });
    // up light
    commands.spawn_bundle(LightBundle {
        transform: Transform::from_xyz(0.0, 750.0, 0.0),
        light: red_light,
        ..Default::default()
    });
    // down light
    commands.spawn_bundle(LightBundle {
        transform: Transform::from_xyz(0.0, 750.0, 0.0),
        light: blue_light,
        ..Default::default()
    });
}

fn animate_lights(mut query: Query<&mut Transform, With<Light>>) {
    for mut transform in query.iter_mut() {
        let translation = &transform.translation;
        let x = translation.x;
        let y = if translation.y.abs() < 0.1 {
            translation.y + 0.15
        } else {
            translation.y
        };

        let theta = y.atan2(x) + 0.174533; // 10 degrees == 0.174533 radians
        let x_new = 750.0 * theta.cos();
        let y_new = 750.0 * theta.sin();

        *transform = Transform::from_xyz(x_new, y_new, 0.0);
    }
}