using System.Collections;
using System.Collections.Generic;
using Godot;
using System;
using System.Threading.Tasks;
using System.Linq;



namespace Rokojori
{
  /** <summary for="class FoliageRenderer">
      
      <title>
        A node to render foliage.
      </title>
      
      <description>
        The GrassPatch has various settings to create a different styles of grass.
        It allows to change the shapes of the blades, their number and distribution, their triangle count,
        rotation and scale, LOD levels and much more. 
        

      </description>

    </summary>  
  */

  [Tool]
  [GlobalClass, Icon("res://addons/rokojori_action_library/Icons/Scatterer.svg") ]
  public partial class FoliageRenderer:Node3D
  {
    [Export]
    public FoliageData[] foliage = [];

    List<FoliageRenderLayer> renderLayers = [];

    [Export]
    public bool processLayers = true;

    [Export]
    public bool updateLayers = true;

    [Export]
    public Camera3D camera;


    Camera3D _assignedCamera;

    [Export]
    public Texture2D noise;

    public Camera3D GetAssignedCamera()
    {
      return _assignedCamera;  
    }

    public override void _Process( double delta )
    {
      _assignedCamera = null;

      if ( ! processLayers || foliage == null || foliage.Length == 0 )
      {
        return;
      }

      

      if ( updateLayers || foliage.Length != renderLayers.Count )
      {
        updateLayers = false;
        this.DestroyChildren();
        renderLayers = foliage.Map<FoliageData,FoliageRenderLayer>( f => FoliageRenderLayer.Create( this, f ) ).ToList();
        renderLayers.ForEach( r => r.data.Initialize( r ) );
      }


      if ( Engine.IsEditorHint() )
      {
        _assignedCamera = EditorInterface.Singleton.GetEditorViewport3D().GetCamera3D();
      }
      else
      {
        _assignedCamera = camera;
      }

      if ( _assignedCamera == null )
      {
        return;
      }


      // this.LogInfo( "Processing", renderLayers.Count );

      renderLayers.ForEach( r => 
        {
          if ( r == null ) 
          { 
            return; 
          } 
          
          r.Update( delta );
        }
      );
    }

  }
}