//////////////////////////////////////////////////////
// MicroSplat
// Copyright (c) Jason Booth
//////////////////////////////////////////////////////

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using JBooth.MicroSplat;

[ExecuteInEditMode]
[DisallowMultipleComponent]
public class MicroSplatPolarisMesh : MicroSplatObject
{
   public delegate void MaterialSyncAll ();
   public delegate void MaterialSync (Material m);

   public static event MaterialSyncAll OnMaterialSyncAll;
   public event MaterialSync OnMaterialSync;

   static List<MicroSplatPolarisMesh> sInstances = new List<MicroSplatPolarisMesh> ();

   public MeshRenderer [] polarisMeshes;

   public Texture2D [] controlTextures;
   [HideInInspector]
   public Material meshBlendMat;

   [HideInInspector]
   public Material meshBlendMatInstance;

   void Awake ()
   {
#if UNITY_EDITOR
      Sync ();
#endif
   }

   void OnEnable ()
   {
      sInstances.Add (this);
#if UNITY_EDITOR
      Sync ();
#endif
   }

#if !UNITY_EDITOR
   void Start()
   {
      Sync();
   }
#endif

   void OnDisable ()
   {
      sInstances.Remove (this);
      Cleanup ();
   }



   void Cleanup ()
   {
      if (matInstance != null && matInstance != templateMaterial)
      {
         DestroyImmediate (matInstance);
      }
   }



   void SyncMeshBlendMat ()
   {
      if (meshBlendMatInstance != null && matInstance != null)
      {
         meshBlendMatInstance.CopyPropertiesFromMaterial (matInstance);
      }
   }

   Material GetMeshBlendMatInstance ()
   {
      if (meshBlendMat != null)
      {
         if (meshBlendMatInstance == null)
         {
            meshBlendMatInstance = new Material (meshBlendMat);
            SyncMeshBlendMat ();
         }
         if (meshBlendMatInstance.shader != meshBlendMat.shader)
         {
            meshBlendMatInstance.shader = meshBlendMat.shader;
            SyncMeshBlendMat ();
         }
      }
      return meshBlendMatInstance;
   }

   void ApplyMeshBlendMap ()
   {
      if (meshBlendMat != null)
      {
         if (meshBlendMatInstance == null)
         {
            meshBlendMatInstance = new Material (meshBlendMat);
         }

         SyncMeshBlendMat ();
      }
   }

   public void Sync ()
   {
      if (templateMaterial == null)
         return;

      if (keywordSO == null)
      {
         RevisionFromMat ();
      }
      if (keywordSO == null)
         return;

      if (polarisMeshes == null || polarisMeshes.Length == 0)
         return;

      ApplySharedData (templateMaterial);
      if (matInstance == null)
      {
         matInstance = new Material (templateMaterial);
      }
      matInstance.CopyPropertiesFromMaterial (templateMaterial);
      matInstance.hideFlags = HideFlags.HideAndDontSave;
      ApplyMaps (matInstance);
      if (controlTextures != null && controlTextures.Length > 0)
      {
         ApplyControlTextures (controlTextures, matInstance);
      }


      for (int i = 0; i < polarisMeshes.Length; ++i)
      {
         var rend = polarisMeshes [i];
         if (rend == null)
            continue;
         rend.sharedMaterial = matInstance;
      }

      if (OnMaterialSync != null)
      {
         OnMaterialSync (matInstance);
      }

      ApplyBlendMap ();
      ApplyMeshBlendMap ();

   }

   public override Bounds GetBounds ()
   {
      Bounds b = new Bounds ();
      bool s = false;
      for (int i = 0; i < polarisMeshes.Length; ++i)
      {
         var rend = polarisMeshes [i];
         if (rend == null)
            continue;
         if (!s)
         {
            b = rend.bounds;
            s = true;
         }
         else
         {
            b.Encapsulate (rend.bounds);
         }
      }
      return b;
   }

   public static new void SyncAll ()
   {
      for (int i = 0; i < sInstances.Count; ++i)
      {
         sInstances [i].Sync ();
      }
      if (OnMaterialSyncAll != null)
      {
         OnMaterialSyncAll ();
      }
   }


}