using UnityEngine;
using System.Collections;

public class HealingLinkFxController : LinkFxController
{
    protected override bool isBillboard
    {
        get { return true; }
    }

    public float fadeDuration = 1f;
    private float _startTime;
    private const string _colorName = "_node_6990";
    
    protected override MeshRenderer RegisterMeshMaterials()
    {
        materialRecords = new LinkFxMaterialRecord[3];
        // Dummy仅仅用于测量长度，不用于其它功能
        var meshRenderer_0 = transform.Find("link_0").GetComponent<MeshRenderer>();
        materialRecords[0] = new LinkFxMaterialRecord(meshRenderer_0.material, new[] {"_dif"});
        var meshRenderer_1 = transform.Find("link_1").GetComponent<MeshRenderer>();
        materialRecords[1] = new LinkFxMaterialRecord(meshRenderer_1.material, new[] {"_dif", "_node_1489_copy", "_alpha"});
        var meshRenderer_2 = transform.Find("link_2").GetComponent<MeshRenderer>();
        materialRecords[2] = new LinkFxMaterialRecord(meshRenderer_2.material, new[] {"_dif", "_node_1489_copy", "_alpha"});
        return meshRenderer_0;
    }

    private void OnEnable()
    {
        _startTime = Time.unscaledTime;
    }

    public override bool TryUpdateLink()
    {
        var alpha = endTime - Time.time < fadeDuration ? Mathf.Clamp01((endTime - Time.time) / fadeDuration) : 1f;
        // 特效默认alpha为0.5
        alpha *= 0.5f;
        SetAlpha(materialRecords[0].material, alpha);
        SetAlpha(materialRecords[1].material, alpha);
        SetAlpha(materialRecords[2].material, alpha);
        return base.TryUpdateLink();
    }

    private static void SetAlpha(Material material, float alpha)
    {
        var color = material.GetColor(_colorName);
        color.a = alpha;
        material.SetColor(_colorName, color);
    }
}