using Godot;
using System;

public partial class Claw : CharacterBody2D
{
	[Export] public float MovingSpeed = 32f;

	public enum State
	{
		Waiting,
		Moving,
		Prepare,
		Attack
	}

	private State _state = State.Waiting;
	private float _stateTimeout = 0;
	private bool _isPlayerNearBy = false;
	private AnimatedSprite2D _sprite;
	private NavigationAgent2D _nav;

	// Called when the node enters the scene tree for the first time.
	public override void _Ready()
	{
		_sprite = (AnimatedSprite2D)FindChild("AnimatedSprite2D");
		_nav = (NavigationAgent2D)FindChild("NavigationAgent2D");
		_nav.VelocityComputed += OnNavVelocityCompute;
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
	}

	public override void _PhysicsProcess(double delta)
	{
		_stateTimeout -= (float)delta;
		switch (_state)
		{
			case State.Waiting:
				break;

			case State.Moving:
				_nav.TargetPosition = Player.Instance.Position;
				var direction = (_nav.GetNextPathPosition() - Position).Normalized();
				_sprite.FlipH = Velocity.X < 0.001f;
				_sprite.Play("default");
				_nav.Velocity = direction * MovingSpeed;
				MoveAndSlide();
				break;
			case State.Prepare:
				_sprite.Play("prepare");
				if (_stateTimeout < 0)
				{
					_state = State.Attack;
					_stateTimeout = 0.25f;
				}

				break;
			case State.Attack:
				_sprite.Play("attack");
				if (_stateTimeout < 0)
				{
					_state = State.Moving;
					if (_isPlayerNearBy)
						Player.Instance.Kill(this);
				}

				break;
		}
	}

	private void _OnEntered(Node2D body)
	{
		if (body is Player)
		{
			_state = State.Prepare;
			_isPlayerNearBy = true;
			_stateTimeout = 0.5f;
		}
	}


	private void _OnExited(Node2D body)
	{
		_isPlayerNearBy = false;
	}

	public void Enable(Node2D body)
	{
		GD.Print("Boss enabled");
		_state = State.Moving;
	}

	private void OnNavVelocityCompute(Vector2 safeVelocity)
	{
		Velocity = safeVelocity;
	}
}