// Copyright (c) 2007, Rodrigo Braz Monteiro
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/// @file visual_feature->h
/// @see visual_feature->cpp
/// @ingroup visual_ts
///

#pragma once

#include "vector2d.h"

#include <boost/intrusive/list_hook.hpp>

class OpenGLWrapper;
class AssDialogue;

/// VisualDraggableFeature display types
enum DraggableFeatureType {
	DRAG_NONE,
	DRAG_BIG_SQUARE,
	DRAG_BIG_CIRCLE,
	DRAG_BIG_TRIANGLE,
	DRAG_SMALL_SQUARE,
	DRAG_SMALL_CIRCLE
};

/// @class VisualDraggableFeature
/// @brief Onscreen control used by many visual tools
///
/// By itself this class doesn't do much. It mostly just draws itself at a
/// specified position and performs hit-testing.
class VisualDraggableFeature : public boost::intrusive::make_list_base_hook<boost::intrusive::link_mode<boost::intrusive::auto_unlink>>::type {
	Vector2D start; ///< position before the last drag operation began

public:
	DraggableFeatureType type = DRAG_NONE; ///< Shape of feature
	Vector2D pos;                          ///< Position of this feature
	int layer = 0;                         ///< Layer; Higher = above
	AssDialogue* line = nullptr;           ///< The dialogue line this feature is for; may be nullptr

	/// @brief Is the given point over this feature?
	/// @param mouse_pos Position of the mouse
	bool IsMouseOver(Vector2D mouse_pos) const;

	/// @brief Draw this feature
	/// @param gl OpenGLWrapper to use
	void Draw(OpenGLWrapper const& gl) const;

	/// Start a drag
	void StartDrag();

	/// Update the position of the feature during a drag
	/// @param d New position of the feature
	/// @param single_axis Only apply the larger of the two changes to the position
	void UpdateDrag(Vector2D d, bool single_axis);

	/// Has this feature actually moved since a drag was last started?
	bool HasMoved() const;
};