/*************************************************************************/
/*  node.h                                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
/*                                                                       */
/* 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.*/
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/*************************************************************************/
#ifndef NODE_H
#define NODE_H

#include "map.h"
#include "object.h"
#include "object_type_db.h"
#include "path_db.h"
#include "scene/main/scene_main_loop.h"
#include "script_language.h"

class Viewport;
class SceneState;
class Node : public Object {

	OBJ_TYPE(Node, Object);
	OBJ_CATEGORY("Nodes");

public:
	enum PauseMode {

		PAUSE_MODE_INHERIT,
		PAUSE_MODE_STOP,
		PAUSE_MODE_PROCESS
	};

	enum DuplicateFlags {

		DUPLICATE_SIGNALS = 1,
		DUPLICATE_GROUPS = 2,
		DUPLICATE_SCRIPTS = 4
	};

	struct Comparator {

		bool operator()(const Node *p_a, const Node *p_b) const { return p_b->is_greater_than(p_a); }
	};

private:
	struct GroupData {

		bool persistent;
		SceneTree::Group *group;
		GroupData() { persistent = false; }
	};

	struct Data {

		String filename;
		Ref<SceneState> instance_state;
		Ref<SceneState> inherited_state;

		HashMap<NodePath, int> editable_instances;

		Node *parent;
		Node *owner;
		Vector<Node *> children; // list of children
		int pos;
		int depth;
		int blocked; // safeguard that throws an error when attempting to modify the tree in a harmful way while being traversed.
		StringName name;
		SceneTree *tree;
		bool inside_tree;
		bool ready_notified;
#ifdef TOOLS_ENABLED
		NodePath import_path; //path used when imported, used by scene editors to keep tracking
#endif

		Viewport *viewport;

		Map<StringName, GroupData> grouped;
		List<Node *>::Element *OW; // owned element
		List<Node *> owned;

		PauseMode pause_mode;
		Node *pause_owner;
		// variables used to properly sort the node when processing, ignored otherwise
		//should move all the stuff below to bits
		bool fixed_process;
		bool idle_process;

		bool input;
		bool unhandled_input;
		bool unhandled_key_input;

		bool parent_owned;
		bool in_constructor;
		bool use_placeholder;

		bool display_folded;

	} data;

	void _print_tree(const Node *p_node);

	virtual bool _use_builtin_script() const { return true; }
	Node *_get_node(const NodePath &p_path) const;
	Node *_get_child_by_name(const StringName &p_name) const;

	void _replace_connections_target(Node *p_new_target);

	void _validate_child_name(Node *p_name, bool p_force_human_readable = false);

	void _propagate_reverse_notification(int p_notification);
	void _propagate_deferred_notification(int p_notification, bool p_reverse);
	void _propagate_enter_tree();
	void _propagate_ready();
	void _propagate_exit_tree();
	void _propagate_validate_owner();
	void _print_stray_nodes();
	void _propagate_pause_owner(Node *p_owner);
	Array _get_node_and_resource(const NodePath &p_path);

	void _duplicate_signals(const Node *p_original, Node *p_copy) const;
	void _duplicate_and_reown(Node *p_new_parent, const Map<Node *, Node *> &p_reown_map) const;
	Node *_duplicate(bool p_use_instancing, int p_flags) const;

	Array _get_children() const;
	Array _get_groups() const;

	friend class SceneTree;

	void _set_tree(SceneTree *p_tree);

protected:
	void _block() { data.blocked++; }
	void _unblock() { data.blocked--; }

	void _notification(int p_notification);

	virtual void add_child_notify(Node *p_child);
	virtual void remove_child_notify(Node *p_child);
	virtual void move_child_notify(Node *p_child);
	//void remove_and_delete_child(Node *p_child);

	void _propagate_replace_owner(Node *p_owner, Node *p_by_owner);

	static void _bind_methods();

	friend class SceneState;

	void _add_child_nocheck(Node *p_child, const StringName &p_name);
	void _set_owner_nocheck(Node *p_owner);
	void _set_name_nocheck(const StringName &p_name);

public:
	enum {
		// you can make your own, but don't use the same numbers as other notifications in other nodes
		NOTIFICATION_ENTER_TREE = 10,
		NOTIFICATION_EXIT_TREE = 11,
		NOTIFICATION_MOVED_IN_PARENT = 12,
		NOTIFICATION_READY = 13,
		//NOTIFICATION_PARENT_DECONFIGURED =15, - it's confusing, it's going away
		NOTIFICATION_PAUSED = 14,
		NOTIFICATION_UNPAUSED = 15,
		NOTIFICATION_FIXED_PROCESS = 16,
		NOTIFICATION_PROCESS = 17,
		NOTIFICATION_PARENTED = 18,
		NOTIFICATION_UNPARENTED = 19,
		NOTIFICATION_INSTANCED = 20,
		NOTIFICATION_DRAG_BEGIN = 21,
		NOTIFICATION_DRAG_END = 22,
	};

	/* NODE/TREE */

	StringName get_name() const;
	void set_name(const String &p_name);

	void add_child(Node *p_child, bool p_legible_unique_name = false);
	void add_child_below_node(Node *p_node, Node *p_child, bool p_legible_unique_name = false);
	void remove_child(Node *p_child);

	int get_child_count() const;
	Node *get_child(int p_index) const;
	bool has_node(const NodePath &p_path) const;
	Node *get_node(const NodePath &p_path) const;
	Node *find_node(const String &p_mask, bool p_recursive = true, bool p_owned = true) const;
	bool has_node_and_resource(const NodePath &p_path) const;
	Node *get_node_and_resource(const NodePath &p_path, RES &r_res) const;

	Node *get_parent() const;
	_FORCE_INLINE_ SceneTree *get_tree() const {
		ERR_FAIL_COND_V(!data.tree, NULL);
		return data.tree;
	}

	_FORCE_INLINE_ bool is_inside_tree() const { return data.inside_tree; }

	bool is_a_parent_of(const Node *p_node) const;
	bool is_greater_than(const Node *p_node) const;

	NodePath get_path() const;
	NodePath get_path_to(const Node *p_node) const;
	Node *find_common_parent_with(const Node *p_node) const;

	void add_to_group(const StringName &p_identifier, bool p_persistent = false);
	void remove_from_group(const StringName &p_identifier);
	bool is_in_group(const StringName &p_identifier) const;

	struct GroupInfo {

		StringName name;
		bool persistent;
	};

	void get_groups(List<GroupInfo> *p_groups) const;
	bool has_persistent_groups() const;

	void move_child(Node *p_child, int p_pos);
	void raise();

	void set_owner(Node *p_owner);
	Node *get_owner() const;
	void get_owned_by(Node *p_by, List<Node *> *p_owned);

	void remove_and_skip();
	int get_index() const;

	void print_tree();

	void set_filename(const String &p_filename);
	String get_filename() const;

	void set_editable_instance(Node *p_node, bool p_editable);
	bool is_editable_instance(Node *p_node) const;
	void set_editable_instances(const HashMap<NodePath, int> &p_editable_instances);
	HashMap<NodePath, int> get_editable_instances() const;

	/* NOTIFICATIONS */

	void propagate_notification(int p_notification);

	/* PROCESSING */
	void set_fixed_process(bool p_process);
	float get_fixed_process_delta_time() const;
	bool is_fixed_processing() const;

	void set_process(bool p_process);
	float get_process_delta_time() const;
	bool is_processing() const;

	void set_process_input(bool p_enable);
	bool is_processing_input() const;

	void set_process_unhandled_input(bool p_enable);
	bool is_processing_unhandled_input() const;

	void set_process_unhandled_key_input(bool p_enable);
	bool is_processing_unhandled_key_input() const;

	int get_position_in_parent() const;

	Node *duplicate(bool p_use_instancing = false, int p_flags = DUPLICATE_GROUPS | DUPLICATE_SIGNALS | DUPLICATE_SCRIPTS) const;
	Node *duplicate_and_reown(const Map<Node *, Node *> &p_reown_map) const;

	//Node *clone_tree() const;

	// used by editors, to save what has changed only
	void set_scene_instance_state(const Ref<SceneState> &p_state);
	Ref<SceneState> get_scene_instance_state() const;

	void set_scene_inherited_state(const Ref<SceneState> &p_state);
	Ref<SceneState> get_scene_inherited_state() const;

	void set_scene_instance_load_placeholder(bool p_enable);
	bool get_scene_instance_load_placeholder() const;

	static Vector<Variant> make_binds(VARIANT_ARG_LIST);

	void replace_by(Node *p_node, bool p_keep_data = false);

	void set_pause_mode(PauseMode p_mode);
	PauseMode get_pause_mode() const;
	bool can_process() const;

	static void print_stray_nodes();

	String validate_child_name(const String &p_name) const;

	void queue_delete();

	//shitty hacks for speed
	static void set_human_readable_collision_renaming(bool p_enabled);
	static void init_node_hrcr();

	void force_parent_owned() { data.parent_owned = true; } //hack to avoid duplicate nodes

#ifdef TOOLS_ENABLED
	void set_import_path(const NodePath &p_import_path); //path used when imported, used by scene editors to keep tracking
	NodePath get_import_path() const;
#endif

	bool is_owned_by_parent() const;

	void get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const;

	void clear_internal_tree_resource_paths();

	_FORCE_INLINE_ Viewport *get_viewport() const { return data.viewport; }

	virtual String get_configuration_warning() const;

	void update_configuration_warning();

	void set_display_folded(bool p_folded);
	bool is_displayed_folded() const;
	/* CANVAS */

	Node();
	~Node();
};

typedef Set<Node *, Node::Comparator> NodeSet;

#endif