/*************************************************************************/
/*  graph_edit.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* 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    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/
#ifndef GRAPH_EDIT_H
#define GRAPH_EDIT_H

#include "scene/gui/graph_node.h"
#include "scene/gui/scroll_bar.h"
#include "scene/gui/slider.h"
#include "scene/gui/tool_button.h"
#include "texture_frame.h"

class GraphEdit;

class GraphEditFilter : public Control {

	OBJ_TYPE(GraphEditFilter,Control);

	friend class GraphEdit;
	GraphEdit *ge;
	virtual bool has_point(const Point2& p_point) const;

public:


	GraphEditFilter(GraphEdit *p_edit);
};

class GraphEdit : public Control {

	OBJ_TYPE(GraphEdit,Control);
public:

	struct Connection {
		StringName from;
		StringName to;
		int from_port;
		int to_port;

	};
private:


	ToolButton *zoom_minus;
	ToolButton *zoom_reset;
	ToolButton *zoom_plus;

	void _zoom_minus();
	void _zoom_reset();
	void _zoom_plus();

	HScrollBar* h_scroll;
	VScrollBar* v_scroll;


	bool connecting;
	String connecting_from;
	bool connecting_out;
	int connecting_index;
	int connecting_type;
	Color connecting_color;
	bool connecting_target;
	Vector2 connecting_to;
	String connecting_target_to;
	int connecting_target_index;

	bool dragging;
	bool just_selected;
	Vector2 drag_accum;
	Point2 drag_origin; // Workaround for GH-5907

	float zoom;

	bool box_selecting;
	bool box_selection_mode_aditive;
	Point2 box_selecting_from;
	Point2 box_selecting_to;
	Rect2 box_selecting_rect;
	List<GraphNode*> previus_selected;

	bool right_disconnects;
	bool updating;
	List<Connection> connections;

	void _draw_cos_line(const Vector2& p_from, const Vector2& p_to,const Color& p_color);

	void _graph_node_raised(Node* p_gn);
	void _graph_node_moved(Node *p_gn);

	void _update_scroll();
	void _scroll_moved(double);
	void _input_event(const InputEvent& p_ev);

	GraphEditFilter *top_layer;
	void _top_layer_input(const InputEvent& p_ev);
	void _top_layer_draw();
	void _update_scroll_offset();

	Array _get_connection_list() const;

	friend class GraphEditFilter;
	bool _filter_input(const Point2& p_point);
protected:

	static void _bind_methods();
	virtual void add_child_notify(Node *p_child);
	virtual void remove_child_notify(Node *p_child);
	void _notification(int p_what);
	virtual bool clips_input() const;
public:

	Error connect_node(const StringName& p_from, int p_from_port,const StringName& p_to,int p_to_port);
	bool is_node_connected(const StringName& p_from, int p_from_port,const StringName& p_to,int p_to_port);
	void disconnect_node(const StringName& p_from, int p_from_port,const StringName& p_to,int p_to_port);
	void clear_connections();

	void set_zoom(float p_zoom);
	float get_zoom() const;

	GraphEditFilter *get_top_layer() const { return top_layer; }
	void get_connection_list(List<Connection> *r_connections) const;

	void set_right_disconnects(bool p_enable);
	bool is_right_disconnects_enabled() const;

	Vector2 get_scroll_ofs() const;


	GraphEdit();
};

#endif // GRAPHEdit_H