/*************************************************************************/
/*  abstract_polygon_2d_editor.h                                         */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#ifndef ABSTRACT_POLYGON_2D_EDITOR_H
#define ABSTRACT_POLYGON_2D_EDITOR_H

#include "editor/editor_plugin.h"
#include "scene/2d/polygon_2d.h"
#include "scene/gui/box_container.h"

class CanvasItemEditor;

class AbstractPolygon2DEditor : public HBoxContainer {
	GDCLASS(AbstractPolygon2DEditor, HBoxContainer);

	Button *button_create = nullptr;
	Button *button_edit = nullptr;
	Button *button_delete = nullptr;

	struct Vertex {
		Vertex() {}
		Vertex(int p_vertex) :
				vertex(p_vertex) {}
		Vertex(int p_polygon, int p_vertex) :
				polygon(p_polygon),
				vertex(p_vertex) {}

		bool operator==(const Vertex &p_vertex) const;
		bool operator!=(const Vertex &p_vertex) const;

		bool valid() const;

		int polygon = -1;
		int vertex = -1;
	};

	struct PosVertex : public Vertex {
		PosVertex() {}
		PosVertex(const Vertex &p_vertex, const Vector2 &p_pos) :
				Vertex(p_vertex.polygon, p_vertex.vertex),
				pos(p_pos) {}
		PosVertex(int p_polygon, int p_vertex, const Vector2 &p_pos) :
				Vertex(p_polygon, p_vertex),
				pos(p_pos) {}

		Vector2 pos;
	};

	PosVertex edited_point;
	Vertex hover_point; // point under mouse cursor
	Vertex selected_point; // currently selected
	PosVertex edge_point; // adding an edge point?

	Vector<Vector2> pre_move_edit;
	Vector<Vector2> wip;
	bool wip_active = false;
	bool wip_destructive = false;

	bool _polygon_editing_enabled = false;

	CanvasItemEditor *canvas_item_editor = nullptr;
	Panel *panel = nullptr;
	ConfirmationDialog *create_resource = nullptr;

protected:
	enum {
		MODE_CREATE,
		MODE_EDIT,
		MODE_DELETE,
		MODE_CONT,
	};

	int mode = MODE_EDIT;

	UndoRedo *undo_redo = nullptr;

	virtual void _menu_option(int p_option);
	void _wip_changed();
	void _wip_close();
	void _wip_cancel();

	void _notification(int p_what);
	void _node_removed(Node *p_node);
	static void _bind_methods();

	void remove_point(const Vertex &p_vertex);
	Vertex get_active_point() const;
	PosVertex closest_point(const Vector2 &p_pos) const;
	PosVertex closest_edge_point(const Vector2 &p_pos) const;

	bool _is_empty() const;

	virtual Node2D *_get_node() const = 0;
	virtual void _set_node(Node *p_polygon) = 0;

	virtual bool _is_line() const;
	virtual bool _has_uv() const;
	virtual int _get_polygon_count() const;
	virtual Vector2 _get_offset(int p_idx) const;
	virtual Variant _get_polygon(int p_idx) const;
	virtual void _set_polygon(int p_idx, const Variant &p_polygon) const;

	virtual void _action_add_polygon(const Variant &p_polygon);
	virtual void _action_remove_polygon(int p_idx);
	virtual void _action_set_polygon(int p_idx, const Variant &p_polygon);
	virtual void _action_set_polygon(int p_idx, const Variant &p_previous, const Variant &p_polygon);
	virtual void _commit_action();

	virtual bool _has_resource() const;
	virtual void _create_resource();

public:
	void disable_polygon_editing(bool p_disable, String p_reason);

	bool forward_gui_input(const Ref<InputEvent> &p_event);
	void forward_canvas_draw_over_viewport(Control *p_overlay);

	void edit(Node *p_polygon);
	AbstractPolygon2DEditor(bool p_wip_destructive = true);
};

class AbstractPolygon2DEditorPlugin : public EditorPlugin {
	GDCLASS(AbstractPolygon2DEditorPlugin, EditorPlugin);

	AbstractPolygon2DEditor *polygon_editor = nullptr;
	String klass;

public:
	virtual bool forward_canvas_gui_input(const Ref<InputEvent> &p_event) override { return polygon_editor->forward_gui_input(p_event); }
	virtual void forward_canvas_draw_over_viewport(Control *p_overlay) override { polygon_editor->forward_canvas_draw_over_viewport(p_overlay); }

	bool has_main_screen() const override { return false; }
	virtual String get_name() const override { return klass; }
	virtual void edit(Object *p_object) override;
	virtual bool handles(Object *p_object) const override;
	virtual void make_visible(bool p_visible) override;

	AbstractPolygon2DEditorPlugin(AbstractPolygon2DEditor *p_polygon_editor, String p_class);
	~AbstractPolygon2DEditorPlugin();
};

#endif // ABSTRACT_POLYGON_2D_EDITOR_H