/*************************************************************************/
/*  pivot_transform.h                                                    */
/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef PIVOT_TRANSFORM_H
#define PIVOT_TRANSFORM_H

#include "core/math/transform.h"
#include "core/reference.h"

#include "model_abstraction.h"

#include "fbx_parser/FBXDocument.h"
#include "tools/import_utils.h"

enum TransformationComp {
	TransformationComp_Translation,
	TransformationComp_Scaling,
	TransformationComp_Rotation,
	TransformationComp_RotationOffset,
	TransformationComp_RotationPivot,
	TransformationComp_PreRotation,
	TransformationComp_PostRotation,
	TransformationComp_ScalingOffset,
	TransformationComp_ScalingPivot,
	TransformationComp_GeometricTranslation,
	TransformationComp_GeometricRotation,
	TransformationComp_GeometricScaling,
	TransformationComp_MAXIMUM
};
// Abstract away pivot data so its simpler to handle
struct PivotTransform : Reference, ModelAbstraction {

	// at the end we want to keep geometric_ everything, post and pre rotation
	// these are used during animation data processing / keyframe ingestion the rest can be simplified down / out.
	Quat pre_rotation = Quat();
	Quat post_rotation = Quat();
	Quat rotation = Quat();
	Quat geometric_rotation = Quat();
	Vector3 rotation_pivot = Vector3();
	Vector3 rotation_offset = Vector3();
	Vector3 scaling_offset = Vector3(1.0, 1.0, 1.0);
	Vector3 scaling_pivot = Vector3(1.0, 1.0, 1.0);
	Vector3 translation = Vector3();
	Vector3 scaling = Vector3(1.0, 1.0, 1.0);
	Vector3 geometric_scaling = Vector3(1.0, 1.0, 1.0);
	Vector3 geometric_translation = Vector3();

	Vector3 raw_rotation = Vector3();
	Vector3 raw_post_rotation = Vector3();
	Vector3 raw_pre_rotation = Vector3();

	/* Read pivots from the document */
	void ReadTransformChain();

	void debug_pivot_xform(String p_name) {
		print_verbose("debugging node name: " + p_name);
		print_verbose("raw rotation: " + raw_rotation * (180 / Math_PI));
		print_verbose("raw pre_rotation " + raw_pre_rotation * (180 / Math_PI));
		print_verbose("raw post_rotation " + raw_post_rotation * (180 / Math_PI));
	}

	Transform ComputeGlobalTransform(Transform t) const;
	Transform ComputeLocalTransform(Transform t) const;
	Transform ComputeGlobalTransform(Vector3 p_translation, Quat p_rotation, Vector3 p_scaling) const;
	Transform ComputeLocalTransform(Vector3 p_translation, Quat p_rotation, Vector3 p_scaling) const;

	/* Extract into xforms and calculate once */
	void ComputePivotTransform();

	/* Execute the command for the pivot generation */
	void Execute();

	void set_parent(Ref<PivotTransform> p_parent) {
		parent_transform = p_parent;
	}

	bool computed_global_xform = false;
	Ref<PivotTransform> parent_transform = Ref<PivotTransform>();
	//Transform chain[TransformationComp_MAXIMUM];

	// cached for later use
	Transform GlobalTransform = Transform();
	Transform LocalTransform = Transform();
	Transform Local_Scaling_Matrix = Transform(); // used for inherit type.
	Transform GeometricTransform = Transform(); // 3DS max only
	FBXDocParser::TransformInheritance inherit_type = FBXDocParser::TransformInheritance_MAX; // maya fbx requires this - sorry <3
};

#endif // PIVOT_TRANSFORM_H