/*
 * MapView.h, part of VCMI engine
 *
 * Authors: listed in file AUTHORS in main folder
 *
 * License: GNU General Public License v2.0 or later
 * Full text of license available in license.txt file, in main folder
 *
 */
#pragma once

#include "../gui/CIntObject.h"

VCMI_LIB_NAMESPACE_BEGIN
struct ObjectPosInfo;
VCMI_LIB_NAMESPACE_END

class Canvas;
class MapViewActions;
class MapViewController;
class MapViewModel;
class MapViewCache;

/// Main class that represents visible section of adventure map
/// Contains all public interface of view and translates calls to internal model
class MapView : public CIntObject
{
	std::shared_ptr<MapViewModel> model;
	std::shared_ptr<MapViewCache> tilesCache;
	std::shared_ptr<MapViewController> controller;
	std::shared_ptr<MapViewActions> actions;

	bool isSwiping;

	std::shared_ptr<MapViewModel> createModel(const Point & dimensions) const;

	void render(Canvas & target, bool fullUpdate);

public:
	MapView(const Point & offset, const Point & dimensions);
	~MapView() override;

	/// Moves current view to another level, preserving position
	void onMapLevelSwitched();

	/// Moves current view by specified distance in pixels
	void onMapScrolled(const Point & distance);

	/// Moves current view to specified position, in pixels
	void onMapSwiped(const Point & viewPosition);

	/// Ends swiping mode and allows normal map scrolling once again
	void onMapSwipeEnded();

	/// Moves current view to specified tile
	void onCenteredTile(const int3 & tile);

	/// Centers view on object and starts "tracking" it
	/// Whenever object changes position, so will the object
	/// Tracking will be disabled on any call that moves view
	void onCenteredObject(const CGObjectInstance * target);

	/// Switches view to "View Earth" / "View Air" mode, displaying downscaled map with overlay
	void onViewSpellActivated( uint32_t tileSize, const std::vector<ObjectPosInfo>& objectPositions, bool showTerrain);

	/// Switches view to downscaled View World
	void onViewWorldActivated( uint32_t tileSize);

	/// Switches view from View World mode back to standard view
	void onViewMapActivated();

	void show(SDL_Surface * to) override;
	void showAll(SDL_Surface * to) override;
};