/*
 * CMapService.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

class CMap;
class CMapHeader;
class CInputStream;

class IMapLoader;

/**
 * The map service provides loading of VCMI/H3 map files. It can
 * be extended to save maps later as well.
 */
class DLL_LINKAGE CMapService
{
public:
	/**
	 * Loads the VCMI/H3 map file specified by the name.
	 *
	 * @param name the name of the map
	 * @return a unique ptr to the loaded map class
	 */
	static std::unique_ptr<CMap> loadMap(const std::string & name);

	/**
	 * Loads the VCMI/H3 map header specified by the name.
	 *
	 * @param name the name of the map
	 * @return a unique ptr to the loaded map header class
	 */
	static std::unique_ptr<CMapHeader> loadMapHeader(const std::string & name);

	/**
	 * Loads the VCMI/H3 map file from a buffer. This method is temporarily
	 * in use to ease the transition to use the new map service.
	 *
	 * TODO Replace method params with a CampaignMapInfo struct which contains
	 * a campaign loading object + name of map.
	 *
	 * @param buffer a pointer to a buffer containing the map data
	 * @param size the size of the buffer
	 * @return a unique ptr to the loaded map class
	 */
	static std::unique_ptr<CMap> loadMap(const ui8 * buffer, int size);

	/**
	 * Loads the VCMI/H3 map header from a buffer. This method is temporarily
	 * in use to ease the transition to use the new map service.
	 *
	 * TODO Replace method params with a CampaignMapInfo struct which contains
	 * a campaign loading object + name of map.
	 *
	 * @param buffer a pointer to a buffer containing the map header data
	 * @param size the size of the buffer
	 * @return a unique ptr to the loaded map class
	 */
	static std::unique_ptr<CMapHeader> loadMapHeader(const ui8 * buffer, int size);

private:
	/**
	 * Gets a map input stream object specified by a map name.
	 *
	 * @param name the name of the map
	 * @return a unique ptr to the input stream class
	 */
	static std::unique_ptr<CInputStream> getStreamFromFS(const std::string & name);

	/**
	 * Gets a map input stream from a buffer.
	 *
	 * @param buffer a pointer to a buffer containing the map data
	 * @param size the size of the buffer
	 * @return a unique ptr to the input stream class
	 */
	static std::unique_ptr<CInputStream> getStreamFromMem(const ui8 * buffer, int size);

	/**
	 * Gets a map loader from the given stream. It performs checks to test
	 * in which map format the map is.
	 *
	 * @param stream the input map stream
	 * @return the constructed map loader
	 */
	static std::unique_ptr<IMapLoader> getMapLoader(std::unique_ptr<CInputStream> & stream);
};

/**
 * Interface for loading a map.
 */
class DLL_LINKAGE IMapLoader
{
public:
	/**
	 * Loads the VCMI/H3 map file.
	 *
	 * @return a unique ptr of the loaded map class
	 */
	virtual std::unique_ptr<CMap> loadMap() = 0;

	/**
	 * Loads the VCMI/H3 map header.
	 *
	 * @return a unique ptr of the loaded map header class
	 */
	virtual std::unique_ptr<CMapHeader> loadMapHeader() = 0;
};