//! Demonstrates all common configuration options,
//! and how to modify them at runtime
//!
//! Controls:
//!   Orbit: Middle click
//!   Pan: Shift + Middle click
//!   Zoom: Mousewheel

use bevy::prelude::*;
use bevy_panorbit_camera::{PanOrbitCamera, PanOrbitCameraPlugin, TouchControls};
use std::f32::consts::TAU;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugins(PanOrbitCameraPlugin)
        .add_systems(Startup, setup)
        .add_systems(Update, toggle_camera_controls_system)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // Ground
    commands.spawn(PbrBundle {
        mesh: meshes.add(Plane3d::default().mesh().size(5.0, 5.0)),
        material: materials.add(Color::srgb(0.3, 0.5, 0.3)),
        ..default()
    });
    // Cube
    commands.spawn(PbrBundle {
        mesh: meshes.add(Cuboid::new(1.0, 1.0, 1.0)),
        material: materials.add(Color::srgb(0.8, 0.7, 0.6)),
        transform: Transform::from_xyz(0.0, 0.5, 0.0),
        ..default()
    });
    // Light
    commands.spawn(PointLightBundle {
        point_light: PointLight {
            shadows_enabled: true,
            ..default()
        },
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });
    // Camera
    commands.spawn((
        // Note we're setting the initial position below with yaw, pitch, and radius, hence
        // we don't set transform on the camera.
        Camera3dBundle::default(),
        PanOrbitCamera {
            // Set focal point (what the camera should look at)
            focus: Vec3::new(0.0, 1.0, 0.0),
            // Set the starting position, relative to focus (overrides camera's transform).
            yaw: Some(TAU / 8.0),
            pitch: Some(TAU / 8.0),
            radius: Some(5.0),
            // Set limits on rotation and zoom
            yaw_upper_limit: Some(TAU / 4.0),
            yaw_lower_limit: Some(-TAU / 4.0),
            pitch_upper_limit: Some(TAU / 3.0),
            pitch_lower_limit: Some(-TAU / 3.0),
            zoom_upper_limit: Some(5.0),
            zoom_lower_limit: Some(1.0),
            // Adjust sensitivity of controls
            orbit_sensitivity: 1.5,
            pan_sensitivity: 0.5,
            zoom_sensitivity: 0.5,
            // Allow the camera to go upside down
            allow_upside_down: true,
            // Change the controls (these match Blender)
            button_orbit: MouseButton::Middle,
            button_pan: MouseButton::Middle,
            modifier_pan: Some(KeyCode::ShiftLeft),
            // Reverse the zoom direction
            reversed_zoom: true,
            // Use alternate touch controls
            touch_controls: TouchControls::TwoFingerOrbit,
            ..default()
        },
    ));
}

// This is how you can change config at runtime.
// Press 'T' to toggle the camera controls.
fn toggle_camera_controls_system(
    key_input: Res<ButtonInput<KeyCode>>,
    mut pan_orbit_query: Query<&mut PanOrbitCamera>,
) {
    if key_input.just_pressed(KeyCode::KeyT) {
        for mut pan_orbit in pan_orbit_query.iter_mut() {
            pan_orbit.enabled = !pan_orbit.enabled;
        }
    }
}