/*************************************************************************/
/*  editor_data.h                                                        */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#ifndef EDITOR_DATA_H
#define EDITOR_DATA_H

#include "core/object/undo_redo.h"
#include "core/templates/list.h"
#include "scene/resources/texture.h"

class ConfigFile;
class EditorPlugin;

/**
 * Stores the history of objects which have been selected for editing in the Editor & the Inspector.
 *
 * Used in the editor to set & access the currently edited object, as well as the history of objects which have been edited.
 */
class EditorSelectionHistory {
	// Stores the object & property (if relevant).
	struct _Object {
		Ref<RefCounted> ref;
		ObjectID object;
		String property;
		bool inspector_only = false;
	};

	// Represents the selection of an object for editing.
	struct HistoryElement {
		// The sub-resources of the parent object (first in the path) that have been edited.
		// For example, Node2D -> nested resource -> nested resource, if edited each individually in their own inspector.
		Vector<_Object> path;
		// The current point in the path. This is always equal to the last item in the path - it is never decremented.
		int level = 0;
	};
	friend class EditorData;

	Vector<HistoryElement> history;
	int current_elem_idx; // The current history element being edited.

public:
	void cleanup_history();

	bool is_at_beginning() const;
	bool is_at_end() const;

	// Adds an object to the selection history. A property name can be passed if the target is a subresource of the given object.
	// If the object should not change the main screen plugin, it can be set as inspector only.
	void add_object(ObjectID p_object, const String &p_property = String(), bool p_inspector_only = false);

	int get_history_len();
	int get_history_pos();

	// Gets an object from the history. The most recent object would be the object with p_obj = get_history_len() - 1.
	ObjectID get_history_obj(int p_obj) const;
	bool is_history_obj_inspector_only(int p_obj) const;

	bool next();
	bool previous();
	ObjectID get_current();
	bool is_current_inspector_only() const;

	// Gets the size of the path of the current history item.
	int get_path_size() const;
	// Gets the object of the current history item, if valid.
	ObjectID get_path_object(int p_index) const;
	// Gets the property of the current history item.
	String get_path_property(int p_index) const;

	void clear();

	EditorSelectionHistory();
};

class EditorSelection;

class EditorData {
public:
	struct CustomType {
		String name;
		Ref<Script> script;
		Ref<Texture2D> icon;
	};

	struct EditedScene {
		Node *root = nullptr;
		String path;
		uint64_t file_modified_time = 0;
		Dictionary editor_states;
		List<Node *> selection;
		Vector<EditorSelectionHistory::HistoryElement> history_stored;
		int history_current = 0;
		Dictionary custom_state;
		uint64_t version = 0;
		NodePath live_edit_root;
	};

private:
	Vector<EditorPlugin *> editor_plugins;

	struct PropertyData {
		String name;
		Variant value;
	};
	HashMap<String, Vector<CustomType>> custom_types;

	List<PropertyData> clipboard;
	UndoRedo undo_redo;
	Vector<Callable> undo_redo_callbacks;
	HashMap<StringName, Callable> move_element_functions;

	Vector<EditedScene> edited_scene;
	int current_edited_scene;

	bool _find_updated_instances(Node *p_root, Node *p_node, HashSet<String> &checked_paths);

	HashMap<StringName, String> _script_class_icon_paths;
	HashMap<String, StringName> _script_class_file_to_path;

public:
	EditorPlugin *get_editor(Object *p_object);
	Vector<EditorPlugin *> get_subeditors(Object *p_object);
	EditorPlugin *get_editor(String p_name);

	void copy_object_params(Object *p_object);
	void paste_object_params(Object *p_object);

	Dictionary get_editor_states() const;
	Dictionary get_scene_editor_states(int p_idx) const;
	void set_editor_states(const Dictionary &p_states);
	void get_editor_breakpoints(List<String> *p_breakpoints);
	void clear_editor_states();
	void save_editor_external_data();
	void apply_changes_in_editors();

	void add_editor_plugin(EditorPlugin *p_plugin);
	void remove_editor_plugin(EditorPlugin *p_plugin);

	int get_editor_plugin_count() const;
	EditorPlugin *get_editor_plugin(int p_idx);

	UndoRedo &get_undo_redo();
	void add_undo_redo_inspector_hook_callback(Callable p_callable); // Callbacks should have this signature: void (Object* undo_redo, Object *modified_object, String property, Variant new_value)
	void remove_undo_redo_inspector_hook_callback(Callable p_callable);
	const Vector<Callable> get_undo_redo_inspector_hook_callback();

	void add_move_array_element_function(const StringName &p_class, Callable p_callable); // Function should have this signature: void (Object* undo_redo, Object *modified_object, String array_prefix, int element_index, int new_position)
	void remove_move_array_element_function(const StringName &p_class);
	Callable get_move_array_element_function(const StringName &p_class) const;

	void save_editor_global_states();
	void restore_editor_global_states();

	void add_custom_type(const String &p_type, const String &p_inherits, const Ref<Script> &p_script, const Ref<Texture2D> &p_icon);
	Variant instance_custom_type(const String &p_type, const String &p_inherits);
	void remove_custom_type(const String &p_type);
	const HashMap<String, Vector<CustomType>> &get_custom_types() const { return custom_types; }

	void instantiate_object_properties(Object *p_object);

	int add_edited_scene(int p_at_pos);
	void move_edited_scene_index(int p_idx, int p_to_idx);
	void remove_scene(int p_idx);
	void set_edited_scene(int p_idx);
	void set_edited_scene_root(Node *p_root);
	int get_edited_scene() const;
	Node *get_edited_scene_root(int p_idx = -1);
	int get_edited_scene_count() const;
	Vector<EditedScene> get_edited_scenes() const;
	String get_scene_title(int p_idx, bool p_always_strip_extension = false) const;
	String get_scene_path(int p_idx) const;
	String get_scene_type(int p_idx) const;
	void set_scene_path(int p_idx, const String &p_path);
	Ref<Script> get_scene_root_script(int p_idx) const;
	void set_edited_scene_version(uint64_t version, int p_scene_idx = -1);
	uint64_t get_scene_version(int p_idx) const;
	void set_scene_modified_time(int p_idx, uint64_t p_time);
	uint64_t get_scene_modified_time(int p_idx) const;
	void clear_edited_scenes();
	void set_edited_scene_live_edit_root(const NodePath &p_root);
	NodePath get_edited_scene_live_edit_root();
	bool check_and_update_scene(int p_idx);
	void move_edited_scene_to_index(int p_idx);
	bool call_build();

	void set_plugin_window_layout(Ref<ConfigFile> p_layout);
	void get_plugin_window_layout(Ref<ConfigFile> p_layout);

	void save_edited_scene_state(EditorSelection *p_selection, EditorSelectionHistory *p_history, const Dictionary &p_custom);
	Dictionary restore_edited_scene_state(EditorSelection *p_selection, EditorSelectionHistory *p_history);
	void notify_edited_scene_changed();
	void notify_resource_saved(const Ref<Resource> &p_resource);

	bool script_class_is_parent(const String &p_class, const String &p_inherits);
	StringName script_class_get_base(const String &p_class) const;
	Variant script_class_instance(const String &p_class);

	Ref<Script> script_class_load_script(const String &p_class) const;

	StringName script_class_get_name(const String &p_path) const;
	void script_class_set_name(const String &p_path, const StringName &p_class);

	String script_class_get_icon_path(const String &p_class) const;
	void script_class_set_icon_path(const String &p_class, const String &p_icon_path);
	void script_class_clear_icon_paths() { _script_class_icon_paths.clear(); }
	void script_class_save_icon_paths();
	void script_class_load_icon_paths();

	EditorData();
};

/**
 * Stores and provides access to the nodes currently selected in the editor.
 *
 * This provides a central location for storing "selected" nodes, as a selection can be triggered from multiple places,
 * such as the SceneTreeDock or a main screen editor plugin (e.g. CanvasItemEditor).
 */
class EditorSelection : public Object {
	GDCLASS(EditorSelection, Object);

	// Contains the selected nodes and corresponding metadata.
	// Metadata objects come from calling _get_editor_data on the editor_plugins, passing the selected node.
	HashMap<Node *, Object *> selection;

	// Tracks whether the selection change signal has been emitted.
	// Prevents multiple signals being called in one frame.
	bool emitted = false;

	bool changed = false;
	bool node_list_changed = false;

	void _node_removed(Node *p_node);

	// Editor plugins which are related to selection.
	List<Object *> editor_plugins;
	List<Node *> selected_node_list;

	void _update_node_list();
	Array _get_transformable_selected_nodes();
	void _emit_change();

protected:
	static void _bind_methods();

public:
	void add_node(Node *p_node);
	void remove_node(Node *p_node);
	bool is_selected(Node *p_node) const;

	template <class T>
	T *get_node_editor_data(Node *p_node) {
		if (!selection.has(p_node)) {
			return nullptr;
		}
		return Object::cast_to<T>(selection[p_node]);
	}

	// Adds an editor plugin which can provide metadata for selected nodes.
	void add_editor_plugin(Object *p_object);

	void update();
	void clear();

	// Returns all the selected nodes.
	TypedArray<Node> get_selected_nodes();
	// Returns only the top level selected nodes.
	// That is, if the selection includes some node and a child of that node, only the parent is returned.
	List<Node *> &get_selected_node_list();
	// Returns all the selected nodes (list version of "get_selected_nodes").
	List<Node *> get_full_selected_node_list();
	// Returns the map of selected objects and their metadata.
	HashMap<Node *, Object *> &get_selection() { return selection; }

	EditorSelection();
	~EditorSelection();
};

#endif // EDITOR_DATA_H