use bevy::diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin};
use bevy::prelude::*;
use bevy::transform::components::Transform;
use bevy_openxr::input::XrInput;
use bevy_openxr::resources::{XrFrameState, XrInstance, XrSession};
use bevy_openxr::xr_input::debug_gizmos::OpenXrDebugRenderer;
use bevy_openxr::xr_input::interactions::{
    draw_interaction_gizmos, draw_socket_gizmos, interactions, update_interactable_states,
    InteractionEvent, XRDirectInteractor, XRInteractable, XRInteractableState, XRInteractorState,
    XRRayInteractor, XRSocketInteractor, socket_interactions,
};
use bevy_openxr::xr_input::oculus_touch::OculusController;
use bevy_openxr::xr_input::prototype_locomotion::{proto_locomotion, PrototypeLocomotionConfig};
use bevy_openxr::xr_input::trackers::{
    AimPose, OpenXRController, OpenXRLeftController, OpenXRRightController, OpenXRTracker,
};
use bevy_openxr::xr_input::Hand;
use bevy_openxr::DefaultXrPlugins;

fn main() {
    color_eyre::install().unwrap();

    info!("Running `openxr-6dof` skill");
    App::new()
        .add_plugins(DefaultXrPlugins)
        .add_plugins(OpenXrDebugRenderer) //new debug renderer adds gizmos to
        .add_plugins(LogDiagnosticsPlugin::default())
        .add_plugins(FrameTimeDiagnosticsPlugin)
        .add_systems(Startup, setup)
        .add_systems(Update, proto_locomotion)
        .add_systems(Startup, spawn_controllers_example)
        .insert_resource(PrototypeLocomotionConfig::default())
        .add_systems(
            Update,
            draw_interaction_gizmos.after(update_interactable_states),
        )
        .add_systems(Update, draw_socket_gizmos.after(update_interactable_states))
        .add_systems(Update, interactions)
        .add_systems(Update, socket_interactions)
        .add_systems(Update, prototype_interaction_input)
        .add_systems(Update, update_interactable_states.after(interactions))
        .add_systems(Update, update_grabbables.after(update_interactable_states))
        .add_event::<InteractionEvent>()
        .run();
}

/// set up a simple 3D scene
fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // plane
    commands.spawn(PbrBundle {
        mesh: meshes.add(shape::Plane::from_size(5.0).into()),
        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: 0.1 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(0.0, 0.5, 0.0),
        ..default()
    });
    // socket
    commands.spawn((
        SpatialBundle {
            transform: Transform::from_xyz(0.0, 0.5, 1.0),
            ..default()
        },
        XRInteractorState::Selecting,
        XRSocketInteractor,
    ));

    // light
    commands.spawn(PointLightBundle {
        point_light: PointLight {
            intensity: 1500.0,
            shadows_enabled: true,
            ..default()
        },
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });
    // camera
    commands.spawn((Camera3dBundle {
        transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
        ..default()
    },));
    //simple interactable
    commands.spawn((
        SpatialBundle {
            transform: Transform::from_xyz(0.0, 1.0, 0.0),
            ..default()
        },
        XRInteractable,
        XRInteractableState::default(),
        Grabbable,
    ));
}

fn spawn_controllers_example(mut commands: Commands) {
    //left hand
    commands.spawn((
        OpenXRLeftController,
        OpenXRController,
        OpenXRTracker,
        SpatialBundle::default(),
        XRRayInteractor,
        AimPose(Transform::default()),
        XRInteractorState::default(),
    ));
    //right hand
    commands.spawn((
        OpenXRRightController,
        OpenXRController,
        OpenXRTracker,
        SpatialBundle::default(),
        XRDirectInteractor,
        XRInteractorState::default(),
    ));
}

fn prototype_interaction_input(
    oculus_controller: Res<OculusController>,
    frame_state: Res<XrFrameState>,
    xr_input: Res<XrInput>,
    instance: Res<XrInstance>,
    session: Res<XrSession>,
    mut right_interactor_query: Query<
        (&mut XRInteractorState),
        (
            With<XRDirectInteractor>,
            With<OpenXRRightController>,
            Without<OpenXRLeftController>,
        ),
    >,
    mut left_interactor_query: Query<
        (&mut XRInteractorState),
        (
            With<XRRayInteractor>,
            With<OpenXRLeftController>,
            Without<OpenXRRightController>,
        ),
    >,
) {
    //lock frame
    let frame_state = *frame_state.lock().unwrap();
    //get controller
    let controller = oculus_controller.get_ref(&instance, &session, &frame_state, &xr_input);
    //get controller triggers
    let left_trigger = controller.trigger(Hand::Left);
    let right_trigger = controller.trigger(Hand::Right);
    //get the interactors and do state stuff
    let mut left_state = left_interactor_query.single_mut();
    if left_trigger > 0.8 {
        *left_state = XRInteractorState::Selecting;
    } else {
        *left_state = XRInteractorState::Idle;
    }
    let mut right_state = right_interactor_query.single_mut();
    if right_trigger > 0.8 {
        *right_state = XRInteractorState::Selecting;
    } else {
        *right_state = XRInteractorState::Idle;
    }
}

#[derive(Component)]
pub struct Grabbable;

pub fn update_grabbables(
    mut events: EventReader<InteractionEvent>,
    mut grabbable_query: Query<(&mut Transform, With<Grabbable>, Without<XRDirectInteractor>)>,
    interactor_query: Query<(
        &GlobalTransform,
        With<XRInteractorState>,
        Without<Grabbable>,
    )>,
) {
    //so basically the idea is to try all the events?
    for event in events.read() {
        info!("some event");
        match grabbable_query.get_mut(event.interactable) {
            Ok(mut grabbable_transform) => {
                info!("we got a grabbable");
                //now we need the location of our interactor
                match interactor_query.get(event.interactor) {
                    Ok(interactor_transform) => {
                        info!("its a direct interactor?");
                        info!(
                            "before gT: {:?}, iT: {:?}",
                            grabbable_transform, interactor_transform
                        );
                        *grabbable_transform.0 = interactor_transform.0.compute_transform();
                        info!(
                            "after gT: {:?}, iT: {:?}",
                            grabbable_transform, interactor_transform
                        );
                    }
                    Err(_) => info!("not a direct interactor"),
                }
            }
            Err(_) => {
                info!("not a grabbable?")
            }
        }
    }
}