using System;
using System.Collections.Generic;
using Godot;
using NodeWar.scripts;

namespace NodeWar;

public partial class Nodule : Area2D
{
	private const float GrowthFactor = 0.01f;

	[Export]
	public float Radius { get; set; } = 120;

	[Export]
	public float MaxRadius { get; set; } = 360;

	[Export]
	public CollisionShape2D Collision { get; set; }

	[Export]
	public bool BuildMode { get; set; } = false;

	[Export]
	public float Age { get; set; } = 0;

	[Export]
	public PackedScene RootScene { get; set; }

	public List<Nodule> ConnectedNodules { get; set; } = [];

	[Signal]
	public delegate void NoduleBuiltEventHandler();

	[Signal]
	public delegate void BuildingCanceledEventHandler();

	public override void _Ready()
	{
		Radius = Age * MaxRadius;

		AreaEntered += OnAreaEntered;
		AreaExited += OnAreaExited;

		QueueRedraw();
	}

	private void OnAreaEntered(Area2D area)
	{
		if (area is Nodule nodule)
		{
			if (nodule.BuildMode)
			{
				return;
			}

			ConnectedNodules.Add(nodule);
		}
	}

	private void OnAreaExited(Area2D area)
	{
		if (area is Nodule nodule)
		{
			if (nodule.BuildMode)
			{
				return;
			}

			ConnectedNodules.Remove(nodule);
		}
	}

	public override void _Process(double delta)
	{
		if (BuildMode)
		{
			GlobalPosition = GetGlobalMousePosition();

			if (Input.IsMouseButtonPressed(MouseButton.Left))
			{
				EmitSignalNoduleBuilt();
				BuildMode = false;

				MouseEntered += OnMouseEntered;
			}

			if (Input.IsMouseButtonPressed(MouseButton.Right))
			{
				EmitSignalBuildingCanceled();
				BuildMode = false;
				QueueFree();
			}
		}
		else
		{
			Age += GrowthFactor * delta.ToFloat();
			Age = MathF.Min(Age, 1);

			Radius = Age * MaxRadius;
			QueueRedraw();
		}

		// TODO: replace with line2d?
		QueueRedraw();
	}

	private void OnMouseEntered()
	{
		GD.Print("Mouse entered");
	}

	public override void _Draw()
	{
		foreach (var nodule in ConnectedNodules)
		{
			if (BuildMode)
			{
				DrawDashedLine(
					Vector2.Zero,
					nodule.GlobalPosition - GlobalPosition,
					Colors.White,
					2f,
					dash: 4f,
					antialiased: true
				);
			}
		}

		if (BuildMode)
		{
			DrawCircle(Vector2.Zero, Radius, new Color(Colors.DarkOliveGreen, 0.2f));
		}
		else
		{
			DrawCircle(Vector2.Zero, Radius, new Color(Colors.WhiteSmoke, 0.4f));
		}
	}
}