/**************************************************************************/
/*  gradient_texture_2d_editor_plugin.h                                   */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
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/**************************************************************************/

#ifndef GRADIENT_TEXTURE_2D_EDITOR_PLUGIN_H
#define GRADIENT_TEXTURE_2D_EDITOR_PLUGIN_H

#include "editor/editor_inspector.h"
#include "editor/plugins/editor_plugin.h"

class Button;
class EditorSpinSlider;
class GradientTexture2D;

class GradientTexture2DEdit : public Control {
	GDCLASS(GradientTexture2DEdit, Control);

	enum Handle {
		HANDLE_NONE,
		HANDLE_FROM,
		HANDLE_TO
	};

	Ref<GradientTexture2D> texture;
	bool snap_enabled = false;
	int snap_count = 0;

	TextureRect *checkerboard = nullptr;

	Handle hovered = HANDLE_NONE;
	Handle grabbed = HANDLE_NONE;
	Point2 initial_grab_pos;

	Size2 handle_size;
	Point2 offset;
	Size2 size;

	Point2 _get_handle_pos(const Handle p_handle);
	Handle get_handle_at(const Vector2 &p_pos);
	void set_fill_pos(const Vector2 &p_pos);

	virtual void gui_input(const Ref<InputEvent> &p_event) override;

	void _draw();

protected:
	void _notification(int p_what);

public:
	void set_texture(Ref<GradientTexture2D> &p_texture);
	void set_snap_enabled(bool p_snap_enabled);
	void set_snap_count(int p_snap_count);

	GradientTexture2DEdit();
};

class GradientTexture2DEditor : public VBoxContainer {
	GDCLASS(GradientTexture2DEditor, VBoxContainer);

	Ref<GradientTexture2D> texture;

	Button *reverse_button = nullptr;
	Button *snap_button = nullptr;
	EditorSpinSlider *snap_count_edit = nullptr;
	GradientTexture2DEdit *texture_editor_rect = nullptr;

	void _reverse_button_pressed();
	void _set_snap_enabled(bool p_enabled);
	void _set_snap_count(int p_snap_count);

protected:
	void _notification(int p_what);

public:
	static const int DEFAULT_SNAP;
	void set_texture(Ref<GradientTexture2D> &p_texture);

	GradientTexture2DEditor();
};

class EditorInspectorPluginGradientTexture2D : public EditorInspectorPlugin {
	GDCLASS(EditorInspectorPluginGradientTexture2D, EditorInspectorPlugin);

public:
	virtual bool can_handle(Object *p_object) override;
	virtual void parse_begin(Object *p_object) override;
};

class GradientTexture2DEditorPlugin : public EditorPlugin {
	GDCLASS(GradientTexture2DEditorPlugin, EditorPlugin);

public:
	GradientTexture2DEditorPlugin();
};

#endif // GRADIENT_TEXTURE_2D_EDITOR_PLUGIN_H