use avian2d::{math::Vector, prelude::*};
use bevy::{input::common_conditions::input_pressed, prelude::*};
use bevy_rand::prelude::{EntropyPlugin, WyRand};
use clap::Parser;

mod game;
use game::{
    runtime::{move_camera, move_player, quit, zoom_camera},
    seed::Seed,
    setup::{setup_balls, setup_player, setup_pseudo_random, setup_ui, setup_walls},
};

/// The initial configuration passed to the game's setup functions.
/// Also functions as a Bevy plugin to pass the configuration into the app.
#[derive(Parser)]
#[command(version, about)]
pub struct AppSettings {
    #[arg(short, long, default_value = ":)")]
    pub seed: Seed,
}

impl Plugin for AppSettings {
    fn build(&self, app: &mut App) {
        app.insert_resource(Gravity(Vector::ZERO))
            .insert_resource(self.seed.clone())
            .add_plugins((
                DefaultPlugins.set(WindowPlugin {
                    primary_window: Window {
                        title: "Distributed physics test".into(),
                        fit_canvas_to_parent: true,
                        ..default()
                    }
                    .into(),
                    ..default()
                }),
                PhysicsPlugins::default().with_length_unit(50.0),
                EntropyPlugin::<WyRand>::with_seed(self.seed.clone().into()),
            ))
            .add_systems(
                Startup,
                (
                    setup_pseudo_random,
                    setup_ui,
                    (setup_player, setup_balls, setup_walls).after(setup_pseudo_random),
                ),
            )
            .add_systems(
                Update,
                (
                    move_player,
                    quit.run_if(input_pressed(KeyCode::KeyQ)),
                    zoom_camera,
                ),
            )
            .add_systems(PostUpdate, move_camera);
    }
}