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 HoverEventHandler(bool tf = true);
	[Signal]
	public delegate void SelectEventHandler(bool tf = true);
	[Signal]
	public delegate void AimEventHandler(bool tf = true);
	[Signal]
	public delegate void LaunchEventHandler(bool tf = true);
	[Signal]
	public delegate void MoveEventHandler(bool tf = true);
	[Signal]
	public delegate void BumpMarbleEventHandler(Marble marble);
	[Signal]
	public delegate void DefenseDownEventHandler(int damage);
	
	[Export]
	public bool Holding = false, Placed = false, Hovered = false, Selected = false, Aimed = false, Launched = false, Moving = false;
	[Export]
	public int Defense = 10, Speed = 400;
	[Export]
	public Vector2 Force = Vector2.Zero, Velocity = Vector2.Zero;
	[Export]
	public Vector2 ScreenSize; // Size of the game window.
	
	public int _defenseMax;
	
	public override void _Ready()
	{
		ScreenSize = GetViewportRect().Size;
		_defenseMax = Defense;
		
		//Hide();
	}
	
	public override void _PhysicsProcess(double delta) //THIS IS LIKE THE UPDATE FUNCTION
	{
		if (Placed)
		{
			TrySelect();
			TryAim();
			TryLaunch();
			TryMovement(delta);
		}
		else if (Holding)
		{
			GetNode<CollisionShape2D>("Bounds").Disabled = true;
			Position = GetGlobalMousePosition();
			if (Input.IsActionJustReleased("left_click"))
			{
				Start(Position);
			}
		}
	}
	
	public void DefenseChange(int change)
	{
		Defense += change;
		if (Defense < 0)
		{
			EmitSignal(SignalName.DefenseDown, Defense); // transfer damage over 0 to player
			Defense = 0; // set defense back to 0
		}
	}
	
	public void Start(Vector2 position)
	{
		
		Holding = false;
		Placed = true;
		Position = position;
		Show();
		GetNode<CollisionShape2D>("Bounds").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;
			//Rotation = Force.Angle() - 180; // if i want to implement this i need to work out the shader to accept rotation
			
			if (!Input.IsActionPressed("left_click"))
			{
				if (!Hovered)
				{
					Launched = true;
					EmitSignal(SignalName.Select, false);
				}
				else
				{
					Aimed = false;
					EmitSignal(SignalName.Aim, false);
				}
			}
		}
	}
	
	public void TryLaunch()
	{
		if (Aimed && Input.IsActionJustReleased("left_click"))
		{
			Selected = false;
			EmitSignal(SignalName.Select, false);
			
			Aimed = false;
			EmitSignal(SignalName.Aim, false);
			
			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)
		{			
			Vector2 Scroll = -LinearVelocity / 100;
			
			Sprite2D sprite = (Sprite2D)GetNode("Texture");
			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)
			{
				Launched = false;
				Moving = false;
				EmitSignal(SignalName.Move, false);
			}
		}
	}
	
	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.Select, false);
				}
			}
		}
	}
	
	private void OnMouseEntered()
	{
		Hovered = true;
		EmitSignal(SignalName.Hover);
	}
	
	private void OnMouseExited()
	{
		Hovered = false;
		EmitSignal(SignalName.Hover, false);
	}
	
	private void OnBodyEntered(Node2D body)
	{
		if (body.GetType() == typeof(Marble))
		{
			EmitSignal(SignalName.BumpMarble, (Marble)body);
		}
	}
}