cirnogodot/Scripts/AttackPatterns/NodeMovementPattern.cs

using Cirno.Scripts.Resources;
using Godot;

namespace Cirno.Scripts.AttackPatterns;

[GlobalClass]
public partial class NodeMovementPattern : AttackPattern
{
    [Export] private Vector2 relativeTargetPosition;
    [Export] private float moveDuration = 2f;
    [Export] private Tween.TransitionType transitionType = Tween.TransitionType.Linear;
    [Export] private Tween.EaseType easeType = Tween.EaseType.InOut;

    public override IPatternMachine MakeMachine(Node2D parent)
    {
        return new NodeMovementPatternMachine(this, parent);
    }

    public class NodeMovementPatternMachine(NodeMovementPattern pattern, Node2D parent) : IPatternMachine
    {
        public Node2D Parent => parent;
        
        private Tween tween;
        private bool isComplete = false;
    
        public void Start()
        {
            if (Parent is not IScriptHost scriptHost)
            {
                GD.PrintErr("Parent was not a script host");
                isComplete = true;
                return;
            }
            
            tween = Parent.CreateTween();
            isComplete = false;

            Vector2 targetPosition = (scriptHost?.HomePosition ?? Parent.GlobalPosition) + pattern.relativeTargetPosition;
            
            tween.TweenProperty(Parent, "global_position", targetPosition, pattern.moveDuration)
                .SetTrans(pattern.transitionType)
                .SetEase(pattern.easeType)
                .Finished += () =>
            {
                isComplete = true;
            };
        }

        public void UpdatePattern(double delta) { }

        public bool IsComplete()
        {
            return isComplete;
        }
    }
}