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

[UnitCategory("Custom")]
public class LightNode : Unit
{
    [DoNotSerialize]
    public ControlInput enter { get; private set; }

    [DoNotSerialize]
    public ControlOutput exit { get; private set; }

    [DoNotSerialize]
    [PortLabel("TargetColor")]
    public ValueInput TargetColorValueInput { get; private set; }

    protected override void Definition()
    {
        enter = ControlInput("enter", (flow) =>
        {
            Color targetColor = flow.GetValue<Color>(TargetColorValueInput);
            GameObject go = flow.stack.gameObject;
            
            if (go != null)
            {
                Renderer renderer = go.GetComponent<Renderer>();

                if (renderer != null)
                {
                    // 启动颜色渐变协程
                    CoroutineRunner.instance.StartCoroutine(ChangeEmissionColor(renderer, targetColor));
                }
            }
            // 继续执行流程
            return exit;
        });

        // 定义输入和输出端口
        exit = ControlOutput("exit");
        TargetColorValueInput = ValueInput<Color>("TargetColor", Color.yellow);

        // 连接节点
        Succession(enter, exit);
        Requirement(TargetColorValueInput, enter);
    }

    private IEnumerator ChangeEmissionColor(Renderer renderer, Color targetColor)
    {
        float duration = 1.0f; // 渐变的持续时间，你可以根据需要进行调整
        float elapsedTime = 0.0f;
        MaterialPropertyBlock mpb = new MaterialPropertyBlock();
        renderer.GetPropertyBlock(mpb);

        
        Color initialColor = mpb.GetColor("_EmissionColor");

        while (elapsedTime < duration)
        {
            float t = elapsedTime / duration;
            Color newColor = Color.Lerp(initialColor, targetColor, t);
            mpb.SetColor("_EmissionColor", newColor);
            renderer.SetPropertyBlock(mpb);
            renderer.material.EnableKeyword("_EMISSION");

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

        // 确保最终颜色与目标颜色匹配
        mpb.SetColor("_EmissionColor", targetColor);
        renderer.SetPropertyBlock(mpb);
        renderer.material.EnableKeyword("_EMISSION");
    }
}