cirnogodot/Scripts/Activables/Teleporter.cs

using System;
using System.Collections;
using System.Threading.Tasks;
using Godot;

namespace Cirno.Scripts.Activables;

public partial class Teleporter : Activable
{
    [Export]
    public bool IsEnabled { get; set; }
    
    public bool IsPrimed { get; private set; }
    
    [Export]
    public Teleporter Target { get; set; }

    [Export] public float ParticleEmitTime { get; private set; } = 2f;
    
    [Export] public float TeleportAnimationLength { get; private set; } = 0.5f; 
    
    [Export] public Vector2 TeleportOffset { get; private set; } = new Vector2(0,-4f);
    
    private double _particleTimer;
    
    private AnimatedSprite2D _animatedSprite;
    
    // [Export]
    // public GpuParticles2D Particles { get; set; }

    private GpuParticles2D _particles;
    
    public override void _Ready()
    {
        _particles = GetNode<GpuParticles2D>("./Particles");
        _animatedSprite = GetNode<AnimatedSprite2D>("AnimatedSprite2D");
        
        IsPrimed = true;
        _particles.Emitting = false;
        _particleTimer = 0;

        if (IsEnabled)
        {
            _animatedSprite.Play("Active");
        }
        else
        {
            _animatedSprite.Play("Default");
        }
    }

    public override void _Process(double delta)
    {
        if (!_particles.Emitting) return;
        
        _particleTimer += delta;

        if (_particleTimer >= ParticleEmitTime)
        {
            _particleTimer = 0;
            _particles.Emitting = false;
        }
    }
    
    public override void Activate(ActivationType activationType = ActivationType.Toggle)
    {
        switch (activationType)
        {
            case ActivationType.Toggle:
                // Enables/Disables teleporter
                break;
            case ActivationType.Enable:
                // Enables Teleporter
                IsEnabled = true;
                _animatedSprite.Play("Active");
                break;
            case ActivationType.Disable:
                IsEnabled = false;
                _animatedSprite.Play("Default");
                // Disables Teleporter
                break;
            case ActivationType.Use:
                // Teleports
                break;
            case ActivationType.Destroy:
                // Destroys
                break;
        }
    }

    public void PrepareForReceiving()
    {
        IsPrimed = false;
        _particles.Emitting = true;
    }

    public void FireParticles()
    {
        _particles.Emitting = true;
        _particleTimer = 0;
    }
    
    private void _on_body_entered(CharacterBody2D area)
    {
        if (area is not PlayerMovement player) return;

        if (!IsPrimed)
        {
            IsPrimed = true;
            //_particles.Emitting = false;
            return;
        }
        
        // Teleport player to target if active
        if (!IsEnabled) return;
        if (Target is null) return;
        
        // Call Teleport here
        _ = Teleport(player);
    }

    private async Task Teleport(PlayerMovement player)
    {
        player.RequestMovementDisable(true);

        await TweenPlayer(player);
        
        Target.PrepareForReceiving();
        _particles.Emitting = true;
        
        await Task.Delay((int)(TeleportAnimationLength * 1000));
        
        player.GlobalPosition = Target.GlobalPosition + TeleportOffset;
        
        player.RequestMovementDisable(false);
    }

    private async Task TweenPlayer(PlayerMovement player)
    {
        // Create a Tween for the teleport animation
        Tween tween = GetTree().CreateTween();
        tween.SetEase(Tween.EaseType.InOut);
        tween.SetTrans(Tween.TransitionType.Sine);
        tween.TweenProperty(player, "global_position", GlobalPosition + new Vector2(0,-4f), TeleportAnimationLength);

        // Wait for the tween to finish
        await ToSignal(tween, "finished");
    }
}