/*************************************************************************/
/*  visual_script_editor.h                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef VISUAL_SCRIPT_EDITOR_H
#define VISUAL_SCRIPT_EDITOR_H

#include "../visual_script.h"
#include "editor/create_dialog.h"
#include "editor/plugins/script_editor_plugin.h"
#include "editor/property_editor.h"
#include "scene/gui/graph_edit.h"
#include "visual_script_property_selector.h"

class VisualScriptEditorSignalEdit;
class VisualScriptEditorVariableEdit;

#ifdef TOOLS_ENABLED

// TODO: Maybe this class should be refactored.
// See https://github.com/godotengine/godot/issues/51913
class VisualScriptEditor : public ScriptEditorBase {
	GDCLASS(VisualScriptEditor, ScriptEditorBase);

	enum {
		TYPE_SEQUENCE = 1000,
		INDEX_BASE_SEQUENCE = 1024
	};

	enum {
		EDIT_ADD_NODE,
		EDIT_SEPARATOR, // popup menu separator - ignored
		EDIT_CUT_NODES,
		EDIT_COPY_NODES,
		EDIT_PASTE_NODES,
		EDIT_DELETE_NODES,
		EDIT_DUPLICATE_NODES,
		EDIT_CLEAR_COPY_BUFFER,

		EDIT_CREATE_FUNCTION,
		EDIT_TOGGLE_BREAKPOINT,
		EDIT_FIND_NODE_TYPE,
		REFRESH_GRAPH,
	};

	enum PortAction {
		CREATE_CALL_SET_GET,
		CREATE_ACTION,
	};

	enum MemberAction {
		MEMBER_EDIT,
		MEMBER_REMOVE
	};

	enum MemberType {
		MEMBER_FUNCTION,
		MEMBER_VARIABLE,
		MEMBER_SIGNAL
	};

	VBoxContainer *members_section = nullptr;
	MenuButton *edit_menu = nullptr;

	Ref<VisualScript> script;

	Button *base_type_select = nullptr;

	LineEdit *func_name_box = nullptr;
	ScrollContainer *func_input_scroll = nullptr;
	VBoxContainer *func_input_vbox = nullptr;
	ConfirmationDialog *function_create_dialog = nullptr;

	GraphEdit *graph = nullptr;
	HBoxContainer *status_bar = nullptr;
	Button *toggle_scripts_button = nullptr;

	VisualScriptEditorSignalEdit *signal_editor = nullptr;

	AcceptDialog *edit_signal_dialog = nullptr;
	EditorInspector *edit_signal_edit = nullptr;

	VisualScriptPropertySelector *method_select = nullptr;
	VisualScriptPropertySelector *new_connect_node_select = nullptr;
	VisualScriptPropertySelector *new_virtual_method_select = nullptr;

	VisualScriptEditorVariableEdit *variable_editor = nullptr;

	AcceptDialog *edit_variable_dialog = nullptr;
	EditorInspector *edit_variable_edit = nullptr;

	CustomPropertyEditor *default_value_edit = nullptr;

	UndoRedo *undo_redo = nullptr;

	Tree *members = nullptr;
	AcceptDialog *function_name_edit = nullptr;
	LineEdit *function_name_box = nullptr;

	Label *hint_text = nullptr;
	Timer *hint_text_timer = nullptr;

	Label *select_func_text = nullptr;

	bool updating_graph = false;

	void _show_hint(const String &p_hint);
	void _hide_timer();

	CreateDialog *select_base_type = nullptr;

	struct VirtualInMenu {
		String name;
		Variant::Type ret;
		bool ret_variant;
		Vector<Pair<Variant::Type, String>> args;
	};

	HashMap<StringName, Color> node_colors;
	HashMap<StringName, Ref<StyleBox>> node_styles;
	HashMap<StringName, Variant::Type> base_type_map;

	void _update_graph_connections();
	void _update_graph(int p_only_id = -1);

	bool updating_members = false;

	void _update_members();
	String _sanitized_variant_text(const StringName &property_name);

	StringName selected;

	String _validate_name(const String &p_name) const;

	struct Clipboard {
		HashMap<int, Ref<VisualScriptNode>> nodes;
		HashMap<int, Vector2> nodes_positions;

		RBSet<VisualScript::SequenceConnection> sequence_connections;
		RBSet<VisualScript::DataConnection> data_connections;
	};

	static Clipboard *clipboard;

	PopupMenu *popup_menu = nullptr;
	PopupMenu *member_popup = nullptr;
	MemberType member_type;
	String member_name;

	PortAction port_action;
	int port_action_node = 0;
	int port_action_output = 0;
	Vector2 port_action_pos;
	int port_action_new_node = 0;

	bool saved_pos_dirty = false;

	Vector2 mouse_up_position;

	void _port_action_menu(int p_option);

	void connect_data(Ref<VisualScriptNode> vnode_old, Ref<VisualScriptNode> vnode, int new_id);

	NodePath drop_path;
	Node *drop_node = nullptr;
	Vector2 drop_position;
	void _selected_connect_node(const String &p_text, const String &p_category, const bool p_connecting = true);
	void connect_seq(Ref<VisualScriptNode> vnode_old, Ref<VisualScriptNode> vnode_new, int new_id);

	void _cancel_connect_node();
	int _create_new_node_from_name(const String &p_text, const Vector2 &p_point);
	void _selected_new_virtual_method(const String &p_text, const String &p_category, const bool p_connecting);

	int error_line = -1;

	void _node_selected(Node *p_node);
	void _center_on_node(int p_id);

	void _node_filter_changed(const String &p_text);
	void _change_base_type_callback();
	void _change_base_type();
	void _toggle_tool_script();
	void _member_selected();
	void _member_edited();

	void _begin_node_move();
	void _end_node_move();
	void _move_node(int p_id, const Vector2 &p_to);

	void _get_ends(int p_node, const List<VisualScript::SequenceConnection> &p_seqs, const RBSet<int> &p_selected, RBSet<int> &r_end_nodes);

	void _node_moved(Vector2 p_from, Vector2 p_to, int p_id);
	void _remove_node(int p_id);
	void _graph_connected(const String &p_from, int p_from_slot, const String &p_to, int p_to_slot);
	void _graph_disconnected(const String &p_from, int p_from_slot, const String &p_to, int p_to_slot);
	void _graph_connect_to_empty(const String &p_from, int p_from_slot, const Vector2 &p_release_pos);

	void _node_ports_changed(int p_id);
	void _node_create();

	void _update_available_nodes();

	void _member_button(Object *p_item, int p_column, int p_button, MouseButton p_mouse_button);

	void _expression_text_changed(const String &p_text, int p_id);
	void _add_input_port(int p_id);
	void _add_output_port(int p_id);
	void _remove_input_port(int p_id, int p_port);
	void _remove_output_port(int p_id, int p_port);
	void _change_port_type(int p_select, int p_id, int p_port, bool is_input);
	void _update_node_size(int p_id);
	void _port_name_focus_out(const Node *p_name_box, int p_id, int p_port, bool is_input);

	Vector2 _get_pos_in_graph(Vector2 p_point) const;
	Vector2 _get_available_pos(bool p_centered = true, Vector2 p_pos = Vector2()) const;

	bool node_has_sequence_connections(int p_id);

	void _generic_search(Vector2 pos = Vector2(), bool node_centered = false);

	virtual void input(const Ref<InputEvent> &p_event) override;
	void _graph_gui_input(const Ref<InputEvent> &p_event);
	void _members_gui_input(const Ref<InputEvent> &p_event);
	void _fn_name_box_input(const Ref<InputEvent> &p_event);
	void _on_fn_name_box_confirmed();
	void _rename_function(const String &p_name, const String &p_new_name);

	void _create_function_dialog();
	void _create_function();
	void _add_func_input();
	void _remove_func_input(Node *p_node);
	void _deselect_input_names();
	void _add_node_dialog();
	void _node_item_selected();
	void _node_item_unselected();

	void _on_nodes_copy();
	void _on_nodes_paste();
	void _on_nodes_delete();
	void _on_nodes_duplicate();

	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
	void drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);

	int editing_id = 0;
	int editing_input = 0;

	bool can_swap = false;
	int data_disconnect_node = 0;
	int data_disconnect_port = 0;

	void _default_value_changed();
	void _default_value_edited(Node *p_button, int p_id, int p_input_port);

	void _menu_option(int p_what);

	void _graph_ofs_changed(const Vector2 &p_ofs);
	void _comment_node_resized(const Vector2 &p_new_size, int p_node);

	void _draw_color_over_button(Object *obj, Color p_color);
	void _button_resource_previewed(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, Variant p_ud);

	VisualScriptNode::TypeGuess _guess_output_type(int p_port_action_node, int p_port_action_output, RBSet<int> &p_visited_nodes);

	void _member_rmb_selected(const Vector2 &p_pos, MouseButton p_button);
	void _member_option(int p_option);

	void _toggle_scripts_pressed();

protected:
	void _notification(int p_what);
	static void _bind_methods();

public:
	virtual void add_syntax_highlighter(Ref<EditorSyntaxHighlighter> p_highlighter) override;
	virtual void set_syntax_highlighter(Ref<EditorSyntaxHighlighter> p_highlighter) override;

	virtual void apply_code() override;
	virtual Ref<Resource> get_edited_resource() const override;
	virtual void set_edited_resource(const Ref<Resource> &p_res) override;
	virtual void enable_editor() override;
	virtual Vector<String> get_functions() override;
	virtual void reload_text() override;
	virtual String get_name() override;
	virtual Ref<Texture2D> get_theme_icon() override;
	virtual bool is_unsaved() override;
	virtual Variant get_edit_state() override;
	virtual void set_edit_state(const Variant &p_state) override;
	virtual void goto_line(int p_line, bool p_with_error = false) override;
	virtual void set_executing_line(int p_line) override;
	virtual void clear_executing_line() override;
	virtual void trim_trailing_whitespace() override;
	virtual void insert_final_newline() override;
	virtual void convert_indent_to_spaces() override;
	virtual void convert_indent_to_tabs() override;
	virtual void ensure_focus() override;
	virtual void tag_saved_version() override;
	virtual void reload(bool p_soft) override;
	virtual Array get_breakpoints() override;
	virtual void set_breakpoint(int p_line, bool p_enable) override{};
	virtual void clear_breakpoints() override{};
	virtual void add_callback(const String &p_function, PackedStringArray p_args) override;
	virtual void update_settings() override;
	virtual bool show_members_overview() override;
	virtual void set_debugger_active(bool p_active) override;
	virtual void set_tooltip_request_func(const Callable &p_toolip_callback) override;
	virtual Control *get_edit_menu() override;
	virtual void clear_edit_menu() override;
	virtual void set_find_replace_bar(FindReplaceBar *p_bar) override { p_bar->hide(); }; // Not needed here.
	virtual bool can_lose_focus_on_node_selection() override { return false; }
	virtual void validate() override;

	virtual Control *get_base_editor() const override;

	static void register_editor();

	static void free_clipboard();

	void update_toggle_scripts_button() override;

	VisualScriptEditor();
	~VisualScriptEditor();
};

// Singleton
class VisualScriptCustomNodes : public Object {
	GDCLASS(VisualScriptCustomNodes, Object);

	friend class VisualScriptLanguage;

protected:
	static void _bind_methods();
	static VisualScriptCustomNodes *singleton;

	static HashMap<String, Ref<RefCounted>> custom_nodes;
	static Ref<VisualScriptNode> create_node_custom(const String &p_name);

public:
	static VisualScriptCustomNodes *get_singleton() { return singleton; }

	void add_custom_node(const String &p_name, const String &p_category, const Ref<Script> &p_script);
	void remove_custom_node(const String &p_name, const String &p_category);

	VisualScriptCustomNodes();
	~VisualScriptCustomNodes();
};

#endif

#endif // VISUAL_SCRIPT_EDITOR_H