/*************************************************************************/
/*  light_2d.h                                                           */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef LIGHT_2D_H
#define LIGHT_2D_H

#include "scene/2d/node_2d.h"

class Light2D : public Node2D {
	GDCLASS(Light2D, Node2D);

public:
	enum ShadowFilter {
		SHADOW_FILTER_NONE,
		SHADOW_FILTER_PCF5,
		SHADOW_FILTER_PCF13,
		SHADOW_FILTER_MAX
	};

	enum BlendMode {
		BLEND_MODE_ADD,
		BLEND_MODE_SUB,
		BLEND_MODE_MIX,
	};

private:
	RID canvas_light;
	bool enabled = true;
	bool editor_only = false;
	bool shadow = false;
	Color color = Color(1, 1, 1);
	Color shadow_color = Color(0, 0, 0, 0);
	real_t height = 0.0;
	real_t energy = 1.0;
	int z_min = -1024;
	int z_max = 1024;
	int layer_min = 0;
	int layer_max = 0;
	int item_mask = 1;
	int item_shadow_mask = 1;
	real_t shadow_smooth = 0.0;
	Ref<Texture2D> texture;
	Vector2 texture_offset;
	ShadowFilter shadow_filter = SHADOW_FILTER_NONE;
	BlendMode blend_mode = BLEND_MODE_ADD;

	void _update_light_visibility();

protected:
	_FORCE_INLINE_ RID _get_light() const { return canvas_light; }
	void _notification(int p_what);
	static void _bind_methods();
	void _validate_property(PropertyInfo &property) const override;

public:
	void set_enabled(bool p_enabled);
	bool is_enabled() const;

	void set_editor_only(bool p_editor_only);
	bool is_editor_only() const;

	void set_color(const Color &p_color);
	Color get_color() const;

	void set_height(real_t p_height);
	real_t get_height() const;

	void set_energy(real_t p_energy);
	real_t get_energy() const;

	void set_z_range_min(int p_min_z);
	int get_z_range_min() const;

	void set_z_range_max(int p_max_z);
	int get_z_range_max() const;

	void set_layer_range_min(int p_min_layer);
	int get_layer_range_min() const;

	void set_layer_range_max(int p_max_layer);
	int get_layer_range_max() const;

	void set_item_cull_mask(int p_mask);
	int get_item_cull_mask() const;

	void set_item_shadow_cull_mask(int p_mask);
	int get_item_shadow_cull_mask() const;

	void set_shadow_enabled(bool p_enabled);
	bool is_shadow_enabled() const;

	void set_shadow_filter(ShadowFilter p_filter);
	ShadowFilter get_shadow_filter() const;

	void set_shadow_color(const Color &p_shadow_color);
	Color get_shadow_color() const;

	void set_shadow_smooth(real_t p_amount);
	real_t get_shadow_smooth() const;

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

	Light2D();
	~Light2D();
};

VARIANT_ENUM_CAST(Light2D::ShadowFilter);
VARIANT_ENUM_CAST(Light2D::BlendMode);

class PointLight2D : public Light2D {
	GDCLASS(PointLight2D, Light2D);

private:
	real_t _scale = 1.0;
	Ref<Texture2D> texture;
	Vector2 texture_offset;

protected:
	static void _bind_methods();

public:
#ifdef TOOLS_ENABLED
	virtual Dictionary _edit_get_state() const override;
	virtual void _edit_set_state(const Dictionary &p_state) override;

	virtual void _edit_set_pivot(const Point2 &p_pivot) override;
	virtual Point2 _edit_get_pivot() const override;
	virtual bool _edit_use_pivot() const override;
	virtual Rect2 _edit_get_rect() const override;
	virtual bool _edit_use_rect() const override;
#endif

	virtual Rect2 get_anchorable_rect() const override;

	void set_texture(const Ref<Texture2D> &p_texture);
	Ref<Texture2D> get_texture() const;

	void set_texture_offset(const Vector2 &p_offset);
	Vector2 get_texture_offset() const;

	void set_texture_scale(real_t p_scale);
	real_t get_texture_scale() const;

	String get_configuration_warning() const override;

	PointLight2D();
};

class DirectionalLight2D : public Light2D {
	GDCLASS(DirectionalLight2D, Light2D);

	real_t max_distance = 10000.0;

protected:
	static void _bind_methods();

public:
	void set_max_distance(real_t p_distance);
	real_t get_max_distance() const;

	DirectionalLight2D();
};

#endif // LIGHT_2D_H