using System;
using Godot;

public partial class ArrowThrower : Node2D
{
	[Export] public Node2D ArrowsNode;

	private bool isAiming = false;
	private Vector2 initialPosition;

	private PackedScene arrowRef = null;
	private RigidBody2D arrow = null;

	// Called when the node enters the scene tree for the first time.
	public override void _Ready()
	{
		arrowRef = GD.Load<PackedScene>("res://Scenes/Entities/arrow.tscn");

		MouseInput mouseInput = FindParent("Mouse Input") as MouseInput;
		mouseInput.OnMouseDown += OnMouseDown;
		mouseInput.OnMouseUp += OnMouseUp;
	}

	private void OnMouseUp()
	{
		isAiming = false;
		Vector2 direction = (initialPosition - GetGlobalMousePosition()).Normalized();
		Vector2 vector2 = GetGlobalMousePosition() - initialPosition;
		arrow.Rotation = Mathf.Atan2(-vector2.X, vector2.Y);
		arrow.LinearVelocity = direction * 500f;
	}

	private void OnMouseDown()
	{
		isAiming = true;
		initialPosition = GetGlobalMousePosition();

		arrow = arrowRef.Instantiate() as RigidBody2D;

		ArrowsNode.AddChild(arrow);
		arrow.GlobalPosition = initialPosition;
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
		if (!isAiming)
			return;

		Vector2 vector2 = GetGlobalMousePosition() - initialPosition;
		arrow.Rotation = Mathf.Atan2(-vector2.X, vector2.Y);
	}
}