cirnogodot/Scripts/Components/Actors/MovementHandler.cs

using System.Collections.Generic;
using System.Linq;
using Cirno.Scripts.Components.Actors;
using Godot;

public abstract partial class MovementHandler : Node2D 
{
    protected Actor _parent;
    
    public abstract Vector2 MovementDirection { get; set; }
    
    public abstract Vector2 FacingDirection { get; set; }

    protected readonly List<InputProvider> _inputProviders = new();
    
    public virtual void Init(Actor parent)
    {
        _parent = parent;
        
        var children = GetChildren();
        foreach (var child in children) {
            if (child is InputProvider inputProvider) 
            {
                _inputProviders.Add(inputProvider);
            }
        }
    }

    public virtual Vector2 AggregateInputProviders()
    {
        return _inputProviders.Aggregate(Vector2.Zero, (current, inputProvider) => current + inputProvider.GetMovementInput().Normalized());
    }

    public abstract void Move(double delta);

}