src/database.h


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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef DATABASE_HEADER
#define DATABASE_HEADER

#include <string>
#include <vector>
#include "irr_v3d.h"
#include "irrlichttypes.h"
#include "util/basic_macros.h"

class Database
{
public:
	virtual void beginSave() = 0;
	virtual void endSave() = 0;
	virtual bool initialized() const { return true; }
};

class MapDatabase : public Database
{
public:
	virtual ~MapDatabase() {}

	virtual bool saveBlock(const v3s16 &pos, const std::string &data) = 0;
	virtual void loadBlock(const v3s16 &pos, std::string *block) = 0;
	virtual bool deleteBlock(const v3s16 &pos) = 0;

	static s64 getBlockAsInteger(const v3s16 &pos);
	static v3s16 getIntegerAsBlock(s64 i);

	virtual void listAllLoadableBlocks(std::vector<v3s16> &dst) = 0;
};

class PlayerSAO;
class RemotePlayer;

class PlayerDatabase
{
public:
	virtual ~PlayerDatabase() {}
	virtual void savePlayer(RemotePlayer *player) = 0;
	virtual bool loadPlayer(RemotePlayer *player, PlayerSAO *sao) = 0;
	virtual bool removePlayer(const std::string &name) = 0;
	virtual void listPlayers(std::vector<std::string> &res) = 0;
};

#endif
/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "subgame.h"
#include "porting.h"
#include "filesys.h"
#include "settings.h"
#include "log.h"
#include "util/strfnd.h"
#include "defaultsettings.h"  // for override_default_settings
#include "mapgen/mapgen.h"  // for MapgenParams
#include "util/string.h"

#ifndef SERVER
	#include "client/tile.h" // getImagePath
#endif

bool getGameMinetestConfig(const std::string &game_path, Settings &conf)
{
	std::string conf_path = game_path + DIR_DELIM + "minetest.conf";
	return conf.readConfigFile(conf_path.c_str());
}

bool getGameConfig(const std::string &game_path, Settings &conf)
{
	std::string conf_path = game_path + DIR_DELIM + "game.conf";
	return conf.readConfigFile(conf_path.c_str());
}

std::string getGameName(const std::string &game_path)
{
	Settings conf;
	if(!getGameConfig(game_path, conf))
		return "";
	if(!conf.exists("name"))
		return "";
	return conf.get("name");
}

struct GameFindPath
{
	std::string path;
	bool user_specific;
	GameFindPath(const std::string &path, bool user_specific):
		path(path),
		user_specific(user_specific)
	{}
};

std::string getSubgamePathEnv()
{
	char *subgame_path = getenv("MINETEST_SUBGAME_PATH");
	return subgame_path ? std::string(subgame_path) : "";
}

SubgameSpec findSubgame(const std::string &id)
{
	if (id.empty())
		return SubgameSpec();
	std::string share = porting::path_share;
	std::string user = porting::path_user;
	std::vector<GameFindPath> find_paths;

	Strfnd search_paths(getSubgamePathEnv());

	while (!search_paths.at_end()) {
		std::string path = search_paths.next(PATH_DELIM);
		find_paths.emplace_back(path + DIR_DELIM + id, false);
		find_paths.emplace_back(path + DIR_DELIM + id + "_game", false);
	}

	find_paths.emplace_back(user + DIR_DELIM + "games" + DIR_DELIM + id + "_game", true);
	find_paths.emplace_back(user + DIR_DELIM + "games" + DIR_DELIM + id, true);
	find_paths.emplace_back(share + DIR_DELIM + "games" + DIR_DELIM + id + "_game",
		false);
	find_paths.emplace_back(share + DIR_DELIM + "games" + DIR_DELIM + id, false);
	// Find game directory
	std::string game_path;
	bool user_game = true; // Game is in user's directory
	for (const GameFindPath &find_path : find_paths) {
		const std::string &try_path = find_path.path;
		if (fs::PathExists(try_path)) {
			game_path = try_path;
			user_game = find_path.user_specific;
			break;
		}
	}
	if (game_path.empty())
		return SubgameSpec();
	std::string gamemod_path = game_path + DIR_DELIM + "mods";
	// Find mod directories
	std::set<std::string> mods_paths;
	if(!user_game)
		mods_paths.insert(share + DIR_DELIM + "mods");
	if(user != share || user_game)
		mods_paths.insert(user + DIR_DELIM + "mods");
	std::string game_name = getGameName(game_path);
	if (game_name.empty())
		game_name = id;
	std::string menuicon_path;
#ifndef SERVER
	menuicon_path = getImagePath(game_path + DIR_DELIM + "menu" + DIR_DELIM + "icon.png");
#endif
	return SubgameSpec(id, game_path, gamemod_path, mods_paths, game_name,
			menuicon_path);
}

SubgameSpec findWorldSubgame(const std::string &world_path)
{
	std::string world_gameid = getWorldGameId(world_path, true);
	// See if world contains an embedded game; if so, use it.
	std::string world_gamepath = world_path + DIR_DELIM + "game";
	if(fs::PathExists(world_gamepath)){
		SubgameSpec gamespec;
		gamespec.id = world_gameid;
		gamespec.path = world_gamepath;
		gamespec.gamemods_path= world_gamepath + DIR_DELIM + "mods";
		gamespec.name = getGameName(world_gamepath);
		if (gamespec.name.empty())
			gamespec.name = "unknown";
		return gamespec;
	}
	return findSubgame(world_gameid);
}

std::set<std::string> getAvailableGameIds()
{
	std::set<std::string> gameids;
	std::set<std::string> gamespaths;
	gamespaths.insert(porting::path_share + DIR_DELIM + "games");
	gamespaths.insert(porting::path_user + DIR_DELIM + "games");

	Strfnd search_paths(getSubgamePathEnv());

	while (!search_paths.at_end())
		gamespaths.insert(search_paths.next(PATH_DELIM));

	for (const std::string &gamespath : gamespaths) {
		std::vector<fs::DirListNode> dirlist = fs::GetDirListing(gamespath);
		for (const fs::DirListNode &dln : dirlist) {
			if(!dln.dir)
				continue;
			// If configuration file is not found or broken, ignore game
			Settings conf;
			if(!getGameConfig(gamespath + DIR_DELIM + dln.name, conf))
				continue;
			// Add it to result
			const char *ends[] = {"_game", NULL};
			std::string shorter = removeStringEnd(dln.name, ends);
			if (!shorter.empty())
				gameids.insert(shorter);
			else
				gameids.insert(dln.name);
		}
	}
	return gameids;
}

std::vector<SubgameSpec> getAvailableGames()
{
	std::vector<SubgameSpec> specs;
	std::set<std::string> gameids = getAvailableGameIds();
	for (const auto &gameid : gameids)
		specs.push_back(findSubgame(gameid));
	return specs;
}

#define LEGACY_GAMEID "minetest"

bool getWorldExists(const std::string &world_path)
{
	return (fs::PathExists(world_path + DIR_DELIM + "map_meta.txt") ||
			fs::PathExists(world_path + DIR_DELIM + "world.mt"));
}

std::string getWorldGameId(const std::string &world_path, bool can_be_legacy)
{
	std::string conf_path = world_path + DIR_DELIM + "world.mt";
	Settings conf;
	bool succeeded = conf.readConfigFile(conf_path.c_str());
	if(!succeeded){
		if(can_be_legacy){
			// If map_meta.txt exists, it is probably an old minetest world
			if(fs::PathExists(world_path + DIR_DELIM + "map_meta.txt"))
				return LEGACY_GAMEID;
		}
		return "";
	}
	if(!conf.exists("gameid"))
		return "";
	// The "mesetint" gameid has been discarded
	if(conf.get("gameid") == "mesetint")
		return "minetest";
	return conf.get("gameid");
}

std::string getWorldPathEnv()
{
	char *world_path = getenv("MINETEST_WORLD_PATH");
	return world_path ? std::string(world_path) : "";
}

std::vector<WorldSpec> getAvailableWorlds()
{
	std::vector<WorldSpec> worlds;
	std::set<std::string> worldspaths;

	Strfnd search_paths(getWorldPathEnv());

	while (!search_paths.at_end())
		worldspaths.insert(search_paths.next(PATH_DELIM));

	worldspaths.insert(porting::path_user + DIR_DELIM + "worlds");
	infostream << "Searching worlds..." << std::endl;