#if HAVE_NODECANVAS

using System;

using UnityEngine;

using ParadoxNotion.Design;
using NodeCanvas.Framework;

using Framework.Support;

namespace Framework.Cinematics {

  /// <summary>Changes the alpha value of a standard shader based material</summary>
  [Category("Material")]
  [Description("Change the transparency level of a standard shader based material")]
  public class SetMaterialAlphaTask : ActionTask {

    /// <summary>Game object whose materials will be faded</summary>
    [RequiredField]
    public BBParameter<GameObject> ObjectToChange;

    /// <summary>Opacity level that will be assigned to the material</summary>
    public float Opacity = 0.5f;

    /// <summary>Summary of what this action does</summary>
    protected override string info {
      get {
        return
          "Set " + this.ObjectToChange.ToString() +
          " alpha to " + this.Opacity.ToString("0.0");
      }
    }

    /// <summary>Called once when the action is executed</summary>
    protected override void OnExecute() {
      Material[] materials = MaterialHelper.GetMeshMaterials(this.ObjectToChange.value);

      int materialCount = materials.Length;
      for(int index = 0; index < materialCount; ++index) {
        Color color = materials[index].color;
        color.a = this.Opacity;
        materials[index].color = color;
      }

      EndAction();
    }

  }

} // namespace Framework.Cinematics

#endif // HAVE_NODECANVAS