#ifndef GRAPH_EDIT_H
#define GRAPH_EDIT_H

/*************************************************************************/
/*  graph_edit.h                                                         */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 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:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "scene/main/control.h"

class GraphEdit;
class GraphEditMinimap;
class GraphNode;
class Label;
class ToolButton;
class SpinBox;
class Button;
class HScrollBar;
class VScrollBar;
class HBoxContainer;

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

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

public:
	GraphEditFilter(GraphEdit *p_edit);
};

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

	friend class GraphEdit;
	friend class GraphEditFilter;
	GraphEdit *ge;

protected:
	static void _bind_methods();

public:
	GraphEditMinimap(GraphEdit *p_edit);

	void update_minimap();
	Rect2 get_camera_rect();

private:
	Vector2 minimap_padding;
	Vector2 minimap_offset;
	Vector2 graph_proportions;
	Vector2 graph_padding;
	Vector2 camera_position;
	Vector2 camera_size;

	bool is_pressing;
	bool is_resizing;

	Vector2 _get_render_size();
	Vector2 _get_graph_offset();
	Vector2 _get_graph_size();

	Vector2 _convert_from_graph_position(const Vector2 &p_position);
	Vector2 _convert_to_graph_position(const Vector2 &p_position);

	void _gui_input(const Ref<InputEvent> &p_ev);

	void _adjust_graph_scroll(const Vector2 &p_offset);
};

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

public:
	struct Connection {
		StringName from;
		StringName to;
		int from_port;
		int to_port;
		float activity;
	};

private:
	Label *zoom_label;
	ToolButton *zoom_minus;
	ToolButton *zoom_reset;
	ToolButton *zoom_plus;

	ToolButton *snap_button;
	SpinBox *snap_amount;

	Button *minimap_button;

	HScrollBar *h_scroll;
	VScrollBar *v_scroll;

	float port_grab_distance_horizontal;
	float port_grab_distance_vertical;

	bool connecting = false;
	String connecting_from;
	bool connecting_out = false;
	int connecting_index;
	int connecting_type;
	Color connecting_color;
	bool connecting_target = false;
	Vector2 connecting_to;
	String connecting_target_to;
	int connecting_target_index;
	bool just_disconnected = false;
	bool connecting_valid = false;
	Vector2 click_pos;

	bool dragging = false;
	bool just_selected = false;
	bool moving_selection = false;
	Vector2 drag_accum;

	float zoom = 1.0f;
	float zoom_step = 1.2;
	float zoom_min;
	float zoom_max;

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

	bool box_selecting = false;
	bool box_selection_mode_additive = false;
	Point2 box_selecting_from;
	Point2 box_selecting_to;
	Rect2 box_selecting_rect;
	List<GraphNode *> previous_selected;

	bool setting_scroll_ofs = false;
	bool right_disconnects = false;
	bool updating = false;
	bool awaiting_scroll_offset_update = false;
	List<Connection> connections;

	void _bake_segment2d(Vector<Vector2> &points, Vector<Color> &colors, float p_begin, float p_end, const Vector2 &p_a, const Vector2 &p_out, const Vector2 &p_b, const Vector2 &p_in, int p_depth, int p_min_depth, int p_max_depth, float p_tol, const Color &p_color, const Color &p_to_color, int &lines) const;

	void _draw_cos_line(CanvasItem *p_where, const Vector2 &p_from, const Vector2 &p_to, const Color &p_color, const Color &p_to_color, float p_width = 2.0, float p_bezier_ratio = 1.0);

	void _graph_node_selected(Node *p_gn);
	void _graph_node_unselected(Node *p_gn);
	void _graph_node_raised(Node *p_gn);
	void _graph_node_moved(Node *p_gn);
	void _graph_node_slot_updated(int p_index, Node *p_gn);

	void _update_scroll();
	void _scroll_moved(double);
	void _gui_input(const Ref<InputEvent> &p_ev);

	Control *connections_layer;
	GraphEditFilter *top_layer;
	GraphEditMinimap *minimap;
	void _top_layer_input(const Ref<InputEvent> &p_ev);

	bool is_in_hot_zone(const Vector2 &pos, const Vector2 &p_mouse_pos, const Vector2i &p_port_size, bool p_left);

	void _top_layer_draw();
	void _connections_layer_draw();
	void _minimap_draw();
	void _update_scroll_offset();

	Array _get_connection_list() const;

	bool lines_on_bg;

	struct ConnType {
		union {
			struct {
				uint32_t type_a;
				uint32_t type_b;
			};
			uint64_t key;
		};

		bool operator<(const ConnType &p_type) const {
			return key < p_type.key;
		}

		ConnType(uint32_t a = 0, uint32_t b = 0) {
			type_a = a;
			type_b = b;
		}
	};

	RBSet<ConnType> valid_connection_types;
	RBSet<int> valid_left_disconnect_types;
	RBSet<int> valid_right_disconnect_types;

	HBoxContainer *zoom_hb;

	friend class GraphEditFilter;
	bool _filter_input(const Point2 &p_point);
	void _snap_toggled();
	void _snap_value_changed(double);

	friend class GraphEditMinimap;
	void _minimap_toggled();

	bool _check_clickable_control(Control *p_control, const Vector2 &pos);

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_connection_activity(const StringName &p_from, int p_from_port, const StringName &p_to, int p_to_port, float p_activity);

	void add_valid_connection_type(int p_type, int p_with_type);
	void remove_valid_connection_type(int p_type, int p_with_type);
	bool is_valid_connection_type(int p_type, int p_with_type) const;

	void set_zoom(float p_zoom);
	void set_zoom_custom(float p_zoom, const Vector2 &p_center);
	float get_zoom() const;

	void set_zoom_min(float p_zoom_min);
	float get_zoom_min() const;

	void set_zoom_max(float p_zoom_max);
	float get_zoom_max() const;

	void set_zoom_step(float p_zoom_step);
	float get_zoom_step() const;

	void set_show_zoom_label(bool p_enable);
	bool is_showing_zoom_label() const;

	void set_minimap_size(Vector2 p_size);
	Vector2 get_minimap_size() const;
	void set_minimap_opacity(float p_opacity);
	float get_minimap_opacity() const;

	void set_minimap_enabled(bool p_enable);
	bool is_minimap_enabled() const;

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

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

	void add_valid_right_disconnect_type(int p_type);
	void remove_valid_right_disconnect_type(int p_type);

	void add_valid_left_disconnect_type(int p_type);
	void remove_valid_left_disconnect_type(int p_type);

	void set_scroll_ofs(const Vector2 &p_ofs);
	Vector2 get_scroll_ofs() const;

	void set_selected(Node *p_child);

	void set_use_snap(bool p_enable);
	bool is_using_snap() const;

	int get_snap() const;
	void set_snap(int p_snap);

	HBoxContainer *get_zoom_hbox();

	GraphEdit();
};

#endif // GRAPHEdit_H