Pong/Scripts/Managers/WallCollisionManager.cs

using Pong.Scripts.Data;
using Pong.Scripts.Objects;

namespace Pong.Scripts.Managers;

public partial class WallCollisionManager : Area2D
{
	[Export] internal PlayerNumber PlayerNumber;

	private GodotObject _scoreManager;
	private StringName _score = "score"; 

	public override void _Ready()
	{
		_scoreManager = GetNode<GodotObject>("/root/Pong/Score");
	}

	/// <summary>
	/// code that runs when a ball collides the wall.
	/// </summary>
	/// <param name="body">the body of the collider.</param>
	private void OnBodyEntered(Node2D body)
	{
		if (body is not Ball ball) return;
		_scoreManager.Call(_score, (long)PlayerNumber);
		
		ResetBall(ball);
	}

	/// <summary>
	/// reset the ball to the starting position and flick it again.
	/// </summary>
	/// <param name="ball">a <see cref="Ball"/> object that you want to reset.</param>
	private async void ResetBall(Ball ball)
	{
		ball.Velocity = Vector2.Zero;
		ball.Position = Vector2.Zero;
		await ToSignal(GetTree().CreateTimer(0.25), SceneTreeTimer.SignalName.Timeout);
		ball.FlickBall();
	}
}