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

namespace Pong.Scripts.Managers;

public partial class ScalingManager : Node
{
	private HFlowContainer _score;
	private BasePaddle _paddle;
	private Ball _ball;
	private Enemy _enemy;

	private Area2D _leftWall;
	private Area2D _rightWall;
	private StaticBody2D _topWall;
	private StaticBody2D _bottomWall;

	private Vector2I _gameResolution;
	internal GameArea GameArea;

	public event Action<Vector2> NewPaddlePosition;
	public event Action<Vector2> NewEnemyPosition;
	public event Action<Vector2> NewBallPosition;

	public override void _EnterTree()
	{
		GetNodes();
		GetTree().Root.SizeChanged += AdaptToGameResolution;
		AdaptToGameResolution();
	}

	public override void _ExitTree()
	{
		GetTree().Root.SizeChanged -= AdaptToGameResolution;
	}

	/// <summary>
	/// a method that gets all the nodes that the scaling manager will manage the position and scale of.
	/// </summary>
	private void GetNodes()
	{
		_score = GetNode<HFlowContainer>("../Score");
		_paddle = GetNode<BasePaddle>("../Paddle");
		_ball = GetNode<Ball>("../Ball");
		_enemy = GetNode<Enemy>("../Enemy");

		_leftWall = GetNode<Area2D>("../Walls/Left");
		_rightWall = GetNode<Area2D>("../Walls/Right");
		_topWall = GetNode<StaticBody2D>("../Walls/Top");
		_bottomWall = GetNode<StaticBody2D>("../Walls/Bottom");
		
		_paddle.ScalingManager = this;
		_enemy.ScalingManager = this;
		NewPaddlePosition += _paddle.SetNewPosition;
		NewEnemyPosition += _enemy.SetNewPosition;
	}

	/// <summary>
	/// adapt to the current resolution of the game.
	/// </summary>
	private void AdaptToGameResolution()
	{
		_paddle.Running = false;
		_enemy.Running = false;

		var normalizedPaddlePosition =
			GameArea?.NormalizePosition(_paddle.Position) ?? new Vector2(0, 0.5f);
		var normalizedEnemyPosition = GameArea?.NormalizePosition(_enemy.Position) ?? new Vector2(1, 0.5f);
		var normalizedBallPosition = GameArea?.NormalizePosition(_ball.Position) ?? new Vector2(0, 0);

		_gameResolution = DisplayServer.WindowGetSize();
		GameArea = new GameArea(_gameResolution);

		SetWallPosition();
		SetScorePosition();
		SetPaddlePosition(normalizedPaddlePosition);
		SetEnemyPosition(normalizedEnemyPosition);

		_paddle.Running = true;
		_enemy.GenerateCollisions();
		_enemy.Running = true;
		_ball.FlickBall();
	}

	/// <summary>
	/// set the position and scale of the walls according to the edge position.
	/// </summary>
	private void SetWallPosition()
	{
		var xSize = GameArea.X.ByWallSizeExtents;
		var ySize = GameArea.Y.ByWallSizeExtents;

		_leftWall.Position = new Vector2(-xSize, 0);
		_rightWall.Position = new Vector2(xSize, 0);
		_topWall.Position = new Vector2(0, -ySize);
		_bottomWall.Position = new Vector2(0, ySize);

		_leftWall.Scale = _leftWall.Scale with { Y = _gameResolution.Y };
		_rightWall.Scale = _rightWall.Scale with { Y = _gameResolution.Y };
		_topWall.Scale = _topWall.Scale with { X = _gameResolution.X - 60 };
		_bottomWall.Scale = _bottomWall.Scale with { X = _gameResolution.X - 60 };
	}

	/// <summary>
	/// set the position of the score ui. this has to be calculated with 0, 0 being the top left of the screen as
	/// the UIs point starts from there instead of the point being in the middle of the screen.
	/// </summary>
	private void SetScorePosition()
	{
		_score.Position = new Vector2(-GameArea.X.ByWallSize, -GameArea.Y.ByWallSize);
		_score.Size = new Vector2(_gameResolution.X - 60, _gameResolution.Y - 60);
	}

	/// <summary>
	/// set the paddle position to a normalized position that gets globalized. the paddle gets the new position with an event.
	/// </summary>
	private void SetPaddlePosition(Vector2 normalizedPosition)
	{
		var newPaddlePos = GameArea.GlobalizePosition(normalizedPosition with { X = 0 }) + new Vector2(48, 0);
		NewPaddlePosition?.Invoke(newPaddlePos);
	}

	private void SetEnemyPosition(Vector2 normalizedPosition)
	{
		var newEnemyPos = GameArea.GlobalizePosition(normalizedPosition with { X = 1 }) + new Vector2(-48, 0);
		NewEnemyPosition?.Invoke(newEnemyPos);
	}

	private void SetBallPosition(Vector2 normalizedPosition)
	{
		var newBallPos = GameArea.GlobalizePosition(normalizedPosition);
		NewBallPosition?.Invoke(newBallPos);
	}

	public static void SetNewPosition(ref Vector2 newPositionField)
	{
	}
}