use std::f32;

use bevy::{asset::LoadedFolder, prelude::*};
use bevy_synthizer::*;

#[derive(Component, Deref, DerefMut)]
struct RotationTimer(Timer);

impl Default for RotationTimer {
    fn default() -> Self {
        Self(Timer::from_seconds(30., TimerMode::Repeating))
    }
}

#[derive(Resource, Default, Deref, DerefMut)]
struct AssetHandles(Handle<LoadedFolder>);

fn setup(asset_server: Res<AssetServer>, mut handles: ResMut<AssetHandles>) {
    **handles = asset_server.load_folder(".");
}

fn load_and_create(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    handles: Res<AssetHandles>,
    listeners: Query<&Listener>,
) {
    if !asset_server.is_loaded_with_dependencies(&**handles) {
        return;
    }
    if !listeners.is_empty() {
        return;
    }
    commands.spawn((
        TransformBundle::default(),
        Listener,
        RotationTimer::default(),
    ));
    let handle = asset_server.load("footstep.wav");
    commands.spawn((
        TransformBundle::from(Transform::from_translation(Vec3::new(10., 0., 0.))),
        Source::default(),
        Sound {
            audio: handle.into(),
            looping: true,
            ..default()
        },
    ));
}

fn rotate_listener(time: Res<Time>, mut query: Query<(&mut RotationTimer, &mut Transform)>) {
    for (mut timer, mut transform) in query.iter_mut() {
        timer.tick(time.delta());
        let angle = f32::consts::PI * 2. * timer.fraction();
        transform.rotation = Quat::from_rotation_z(angle);
    }
}

fn main() {
    App::new()
        .add_plugins((
            DefaultPlugins,
            SynthizerPlugin {
                default_panner_strategy: Some(bevy_synthizer::syz::PannerStrategy::Hrtf),
                default_distance_model: Some(bevy_synthizer::syz::DistanceModel::Inverse),
                ..default()
            },
        ))
        .init_resource::<AssetHandles>()
        .add_systems(Startup, setup)
        .add_systems(Update, (load_and_create, rotate_listener))
        .run();
}