using System;
using Godot;


using Rokojori.Extensions;
namespace Rokojori
{  
  [Tool]
  [GlobalClass, Icon("res://addons/rokojori_action_library/Icons/Tween.svg")]
  public partial class TweenFloatShaderProperty:SequenceAction, Animator
  {
    [Export]
    public Material material;

    [Export]
    public GeometryInstance3D instanceTarget;

    [Export]
    public FloatPropertyName propertyName;

    [Export]
    public float endValue;

    [Export]
    public Duration duration;

    [Export]
    public Curve curve;

    [ExportGroup( "Stop")]
    [Export]
    public bool stopAnimation = false;

    [Export]
    public bool setStopValue = false;

    [ExportGroup( "Animate")]
    [Export]
    public bool animateStartValue = false;

    [Export]
    public float animationStartValue = 0f;

    [ExportGroup( "Editor Testing")]
    [Export]
    public bool forceStartValue = false;
    
    [Export]
    public float forcedStartValue = 0f;


    public void OnAnimatorStart(){}
    public void OnAnimatorEnd(){}
    public void OnAnimatorCancel(){}

    int _actionID = -1;
    int _timeID = -1;

    [Export]
    public bool interruptCurrent = true;

    protected override void _OnTrigger()
    {
      if ( material != null && ! IsInstanceValid( material ) )
      {
        material = null;
      }

      if ( instanceTarget != null && ! IsInstanceValid( instanceTarget ) )
      {
        instanceTarget = null;
      }

      if ( propertyName == null )
      {
        return;
      }

      // this.LogInfo( "TRIGGERED" );

      if ( instanceTarget != null )
      {
        // this.LogInfo( "INSTANCE" );
        TweenInstanceUniform();
        return;
      }

      if ( material != null )
      {
        // this.LogInfo( "MATERIAL" );
        TweenMaterial();
        return;
      }

      
    }

    void TweenMaterial()
    {
      if ( ! interruptCurrent && _actionID != -1 )
      {
        return;
      }

      if ( _actionID != -1 )
      {
        CancelAction( _actionID );
      }

      if ( stopAnimation )
      {

        AnimationManager.StartAnimation( this, material, propertyName );

        if ( setStopValue )
        {
          propertyName.Set( material, endValue );
        }

        AnimationManager.EndAnimation( this, material, propertyName );


        return;
      }


      _actionID = DispatchStart();

      var startValue = propertyName.Get( material );




      if ( forceStartValue && Engine.IsEditorHint() )
      {
        startValue = forcedStartValue;
      }

      if ( animateStartValue )
      {
        startValue = animationStartValue;
      }



      AnimationManager.StartAnimation( this, material, propertyName );

      // this.LogInfo( "Get Float Tween", startValue );

      _timeID = TimelineManager.ScheduleSpanWith( duration,
        ( span, type )=>
        {

          // this.LogInfo( "Update Float Tween", startValue );
          if ( span.id != _timeID )
          {
            return;
          }

          if ( ! AnimationManager.IsAnimating( this, material, propertyName  ) )
          {
            return;
          }

          var phase = span.phase;

          if ( curve != null )
          {
            phase = curve.Sample( phase );
          }

          var value = Mathf.Lerp( startValue, endValue, phase );

          // this.LogInfo( "Updating Float Tween", "phase:", phase, "value:", value, target );

          propertyName.Set( material, value );
          // ReflectionHelper.SetValue( material, propertyName , value );

          if ( type == TimelineSpanUpdateType.End )
          {
            // this.LogInfo( "End Float Tween", endValue );

            // target._Set( targetMember, endValue );

            propertyName.Set( material, endValue );
            AnimationManager.EndAnimation( this, material, propertyName );
            DispatchEnd( _actionID );
            _actionID = -1;
            _timeID = -1;
          }
        },
        this
      ).id;
    }

    void TweenInstanceUniform()
    {
      if ( ! interruptCurrent && _actionID != -1 )
      {
        return;
      }

      if ( _actionID != -1 )
      {
        CancelAction( _actionID );
      }

      if ( stopAnimation )
      {

        AnimationManager.StartAnimation( this, instanceTarget, propertyName.propertyName );

        if ( setStopValue )
        {
          propertyName.SetInstance( instanceTarget, endValue );
        }

        AnimationManager.EndAnimation( this, instanceTarget, propertyName.propertyName );


        return;
      }


      _actionID = DispatchStart();

      var startValue = propertyName.GetInstance( instanceTarget );




      if ( forceStartValue && Engine.IsEditorHint() )
      {
        startValue = forcedStartValue;
      }

      if ( animateStartValue )
      {
        startValue = animationStartValue;
      }



      AnimationManager.StartAnimation( this, instanceTarget, propertyName.propertyName );

      // this.LogInfo( "Get Float Tween", startValue );

      _timeID = TimelineManager.ScheduleSpanWith( duration,
        ( span, type )=>
        {

          // this.LogInfo( "Update Float Tween", startValue );
          if ( span.id != _timeID )
          {
            return;
          }

          if ( ! AnimationManager.IsAnimating( this, instanceTarget, propertyName.propertyName  ) )
          {
            return;
          }

          var phase = span.phase;

          if ( curve != null )
          {
            phase = curve.Sample( phase );
          }

          var value = Mathf.Lerp( startValue, endValue, phase );



          // this.LogInfo( "Updating Float Tween", "phase:", phase, "value:", value, instanceTarget );

          propertyName.SetInstance( instanceTarget, value );
          // ReflectionHelper.SetValue( material, propertyName , value );

          if ( type == TimelineSpanUpdateType.End )
          {
            // this.LogInfo( "End Float Tween", endValue );

            // target._Set( targetMember, endValue );

            propertyName.SetInstance( instanceTarget, endValue );
            AnimationManager.EndAnimation( this, instanceTarget, propertyName.propertyName );
            DispatchEnd( _actionID );
            _actionID = -1;
            _timeID = -1;
          }
        },
        this
      ).id;
    }

  }
}