using System.Collections;
using UnityEngine;
using Unity.VisualScripting;

[UnitCategory("Custom")]
public class TransparencyNodeURP : Unit
{
    [DoNotSerialize]
    public ControlInput enter { get; private set; }
    
    [DoNotSerialize]
    [PortLabel("TargetTransparency")]
    public ValueInput targetTransparency { get; private set; }
    
    [DoNotSerialize]
    public ControlOutput exit { get; private set; }

    protected override void Definition()
    {
        enter = ControlInput("enter", (flow) =>
        {
            float targetTransparencyValue = flow.GetValue<float>(this.targetTransparency);
            GameObject go = flow.stack.gameObject;

            if (go != null)
            {
                Renderer renderer = go.GetComponent<Renderer>();

                if (renderer != null)
                {
                    CoroutineRunner.instance.StartCoroutine(ChangeTransparency(renderer, targetTransparencyValue));
                }
            }
            return exit;
        });

        exit = ControlOutput("exit");
        targetTransparency = ValueInput<float>("TargetTransparency", 0.5f);
        Succession(enter, exit);
        Requirement(targetTransparency, enter);
    }

    private IEnumerator ChangeTransparency(Renderer renderer,float targetTransparency)
    {
        float duration = 1.0f; // 透明度变化的持续时间
        float elapsedTime = 0.0f;

        Material material = renderer.material;
        Texture baseMap = material.GetTexture("_BaseMap");
        Color initialColor = material.GetColor("_BaseColor");
        Color targetColor = new Color(initialColor.r, initialColor.g, initialColor.b, targetTransparency); // 设置目标Alpha值为1

        while (elapsedTime < duration)
        {
            float t = elapsedTime / duration;
            Color newColor = Color.Lerp(initialColor, targetColor, t);
            material.SetColor("_BaseColor", newColor);

            elapsedTime += Time.deltaTime;
            yield return null; // 等待下一帧
        }

        // 设置最终颜色
        material.SetColor("_BaseColor", targetColor);
    }
}