use crate::GameState;
use avian3d::prelude::{LinearVelocity, Position};
use bevy::{math::ops::sin, prelude::*};
use lightyear::prelude::LocalTimeline;
use serde::{Deserialize, Serialize};

#[derive(Component, Reflect, Default, Debug, Serialize, Deserialize, PartialEq)]
#[reflect(Component)]
pub struct ActivePlatform {
    pub start: Vec3,
    pub target: Vec3,
}

pub fn plugin(app: &mut App) {
    app.register_type::<ActivePlatform>();
    app.add_systems(
        FixedUpdate,
        move_active.run_if(in_state(GameState::Playing)),
    );
}

fn move_active(
    #[cfg(not(feature = "server"))] time: Single<&LocalTimeline>,
    #[cfg(feature = "server")] time: Single<&LocalTimeline, With<lightyear::prelude::Server>>,
    bevy_time: Res<Time<Fixed>>,
    mut platforms: Query<(&Position, &ActivePlatform, &mut LinearVelocity)>,
) {
    for (position, active, mut velocity) in platforms.iter_mut() {
        let now = time.now.as_duration(bevy_time.delta()).as_secs_f32();
        let t = (sin(now * 0.4) + 1.) / 2.;

        let target = active.start.lerp(active.target, t);
        let prev = position.0;

        velocity.0 = (target - prev) / bevy_time.delta_secs();
    }
}