using Godot;
using System;

public partial class Marble : RigidBody2D
{
	// Don't forget to rebuild the project so the editor knows about the new signal.

	[Signal]
	public delegate void HitEventHandler();
	[Signal]
	public delegate void HoverEventHandler();
	[Signal]
	public delegate void HoverFalseEventHandler();
	[Signal]
	public delegate void SelectEventHandler();
	[Signal]
	public delegate void SelectFalseEventHandler();
	[Signal]
	public delegate void AimEventHandler();
	[Signal]
	public delegate void AimFalseEventHandler();
	[Signal]
	public delegate void LaunchEventHandler();
	[Signal]
	public delegate void MoveEventHandler();
	[Signal]
	public delegate void StopEventHandler();
	
	[Export]
	public int Speed { get; set; } = 400; // How fast the player will move (pixels/sec).

	public bool Hovered = false, Selected = false, Aimed = false, Launched = false, Moving = false;
	public Vector2 Force = Vector2.Zero, Velocity = Vector2.Zero;
	public Vector2 ScreenSize; // Size of the game window.
	
	public override void _Ready()
	{
		ScreenSize = GetViewportRect().Size;
		//Hide();
	}
	
	public override void _PhysicsProcess(double delta) //THIS IS LIKE THE UPDATE FUNCTION
	{
		TrySelect();
		TryAim();
		TryLaunch();
		TryMovement(delta);

	}
	
	public void ProcessOnBump(Node2D body)
	{
		GD.Print(body);
	}
	
	public void ProcessOnMovement()
	{

	}
	
	public void Start(Vector2 position)
	{
		Position = position;
		Show();
		GetNode<CollisionShape2D>("CollisionShape2D").Disabled = false;
	}
	
	public void TryAim()
	{
		if (Selected && Input.IsActionPressed("left_click") && !Hovered && !Aimed)
		{
			Aimed = true;
			EmitSignal(SignalName.Aim);
		}
		
		if (Aimed)
		{
			Vector2 mousePosition = GetGlobalMousePosition();
			Force = Position - mousePosition;
			
			if (!Input.IsActionPressed("left_click"))
			{
				if (!Hovered)
				{
					Launched = true;
					EmitSignal(SignalName.SelectFalse);
				}
				else
				{
					Aimed = false;
					EmitSignal(SignalName.AimFalse);
				}
			}
		}
	}
	
	public void TryLaunch()
	{
		if (Aimed && Input.IsActionJustReleased("left_click"))
		{
			Selected = false;
			EmitSignal(SignalName.SelectFalse);
			
			Aimed = false;
			EmitSignal(SignalName.AimFalse);
			
			Launched = true;
			EmitSignal(SignalName.Launch);
			
			ApplyCentralForce(Force * Speed);
			
			Force = Vector2.Zero;
		}
	}
	
	public void TryMovement(double delta)
	{
		if (LinearVelocity.Length() > 0 && !Sleeping)
		{
			if (!Moving)
			{
				Moving = true;
				EmitSignal(SignalName.Move);
			}
		}
		if (Moving)
		{
			ProcessOnMovement();
			
			Vector2 Scroll = -LinearVelocity / 100;
			
			Sprite2D sprite = (Sprite2D)GetNode("Sprite2D");
			ShaderMaterial material = (ShaderMaterial)sprite.Material;
			
			float CurrentScrollX = (float)material.GetShaderParameter("scroll_x");
			material.SetShaderParameter("scroll_x", (CurrentScrollX + Scroll.X * (float)delta) % 1.0f);
			
			float CurrentScrollY = (float)material.GetShaderParameter("scroll_y");
			material.SetShaderParameter("scroll_y", (CurrentScrollY + Scroll.Y * (float)delta) % 1.0f);
			
			if (Sleeping)
			{
				Moving = false;
				EmitSignal(SignalName.Stop);
			}
		}
	}
	
	public void TrySelect()
	{
		if (Hovered)
		{
			if (Input.IsActionJustPressed("left_click") && !Selected)
			{
				Selected = true;
				EmitSignal(SignalName.Select);
			}
		}
		
		if (Selected)
		{
			if (!Hovered)
			{
				if (Input.IsActionJustPressed("left_click") && Selected)
				{
					Selected = false;
					EmitSignal(SignalName.SelectFalse);
				}
			}
		}
	}
	
	private void OnMouseEntered()
	{
		Hovered = true;
		EmitSignal(SignalName.Hover);
	}
	
	private void OnMouseExited()
	{
		Hovered = false;
		EmitSignal(SignalName.HoverFalse);
	}
	
	private void OnBodyEntered(Node2D body)
	{
		if (body.GetType() == typeof(Marble))
		{
			Marble marble = (Marble)body;
			ProcessOnBump(marble);
			marble.ProcessOnBump(this);
		}
	}
}