/*************************************************************************/
/*  animation_blend_space_2d.h                                           */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#ifndef ANIMATION_BLEND_SPACE_2D_H
#define ANIMATION_BLEND_SPACE_2D_H

#include "scene/animation/animation_tree.h"

class AnimationNodeBlendSpace2D : public AnimationRootNode {
	GDCLASS(AnimationNodeBlendSpace2D, AnimationRootNode);

public:
	enum BlendMode {
		BLEND_MODE_INTERPOLATED,
		BLEND_MODE_DISCRETE,
		BLEND_MODE_DISCRETE_CARRY,
	};

protected:
	enum {
		MAX_BLEND_POINTS = 64
	};

	struct BlendPoint {
		StringName name;
		Ref<AnimationRootNode> node;
		Vector2 position;
	};

	BlendPoint blend_points[MAX_BLEND_POINTS];
	int blend_points_used = 0;

	struct BlendTriangle {
		int points[3] = {};
	};

	Vector<BlendTriangle> triangles;

	StringName blend_position = "blend_position";
	StringName closest = "closest";
	StringName length_internal = "length_internal";
	Vector2 max_space = Vector2(1, 1);
	Vector2 min_space = Vector2(-1, -1);
	Vector2 snap = Vector2(0.1, 0.1);
	String x_label = "x";
	String y_label = "y";
	BlendMode blend_mode = BLEND_MODE_INTERPOLATED;

	void _add_blend_point(int p_index, const Ref<AnimationRootNode> &p_node);
	void _set_triangles(const Vector<int> &p_triangles);
	Vector<int> _get_triangles() const;

	void _blend_triangle(const Vector2 &p_pos, const Vector2 *p_points, float *r_weights);

	bool auto_triangles = true;
	bool trianges_dirty = false;

	void _update_triangles();
	void _queue_auto_triangles();

	void _tree_changed();

protected:
	virtual void _validate_property(PropertyInfo &property) const override;
	static void _bind_methods();

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual void get_child_nodes(List<ChildNode> *r_child_nodes) override;

	void add_blend_point(const Ref<AnimationRootNode> &p_node, const Vector2 &p_position, int p_at_index = -1);
	void set_blend_point_position(int p_point, const Vector2 &p_position);
	void set_blend_point_node(int p_point, const Ref<AnimationRootNode> &p_node);
	Vector2 get_blend_point_position(int p_point) const;
	Ref<AnimationRootNode> get_blend_point_node(int p_point) const;
	void remove_blend_point(int p_point);
	int get_blend_point_count() const;

	bool has_triangle(int p_x, int p_y, int p_z) const;
	void add_triangle(int p_x, int p_y, int p_z, int p_at_index = -1);
	int get_triangle_point(int p_triangle, int p_point);
	void remove_triangle(int p_triangle);
	int get_triangle_count() const;

	void set_min_space(const Vector2 &p_min);
	Vector2 get_min_space() const;

	void set_max_space(const Vector2 &p_max);
	Vector2 get_max_space() const;

	void set_snap(const Vector2 &p_snap);
	Vector2 get_snap() const;

	void set_x_label(const String &p_label);
	String get_x_label() const;

	void set_y_label(const String &p_label);
	String get_y_label() const;

	virtual double process(double p_time, bool p_seek) override;
	virtual String get_caption() const override;

	Vector2 get_closest_point(const Vector2 &p_point);

	void set_auto_triangles(bool p_enable);
	bool get_auto_triangles() const;

	void set_blend_mode(BlendMode p_blend_mode);
	BlendMode get_blend_mode() const;

	virtual Ref<AnimationNode> get_child_by_name(const StringName &p_name) override;

	AnimationNodeBlendSpace2D();
	~AnimationNodeBlendSpace2D();
};

VARIANT_ENUM_CAST(AnimationNodeBlendSpace2D::BlendMode)

#endif // ANIMATION_BLEND_SPACE_2D_H