/*
 * ZeroTier One - Network Virtualization Everywhere
 * Copyright (C) 2011-2015  ZeroTier, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ZT_SQLITENETWORKCONTROLLER_HPP
#define ZT_SQLITENETWORKCONTROLLER_HPP

#include <stdint.h>

#include <string>
#include <map>
#include <vector>
#include <set>

#include "../node/Constants.hpp"

#include "../node/NetworkController.hpp"
#include "../node/Mutex.hpp"
#include "../node/Utils.hpp"
#include "../node/InetAddress.hpp"

#include "../osdep/OSUtils.hpp"

#include "../ext/json/json.hpp"

namespace ZeroTier {

class Node;

class SqliteNetworkController : public NetworkController
{
public:
	SqliteNetworkController(Node *node,const char *dbPath);
	virtual ~SqliteNetworkController();

	virtual NetworkController::ResultCode doNetworkConfigRequest(
		const InetAddress &fromAddr,
		const Identity &signingId,
		const Identity &identity,
		uint64_t nwid,
		const Dictionary<ZT_NETWORKCONFIG_METADATA_DICT_CAPACITY> &metaData,
		NetworkConfig &nc);

	unsigned int handleControlPlaneHttpGET(
		const std::vector<std::string> &path,
		const std::map<std::string,std::string> &urlArgs,
		const std::map<std::string,std::string> &headers,
		const std::string &body,
		std::string &responseBody,
		std::string &responseContentType);
	unsigned int handleControlPlaneHttpPOST(
		const std::vector<std::string> &path,
		const std::map<std::string,std::string> &urlArgs,
		const std::map<std::string,std::string> &headers,
		const std::string &body,
		std::string &responseBody,
		std::string &responseContentType);
	unsigned int handleControlPlaneHttpDELETE(
		const std::vector<std::string> &path,
		const std::map<std::string,std::string> &urlArgs,
		const std::map<std::string,std::string> &headers,
		const std::string &body,
		std::string &responseBody,
		std::string &responseContentType);

private:
	static void _circuitTestCallback(ZT_Node *node,ZT_CircuitTest *test,const ZT_CircuitTestReport *report);

	inline nlohmann::json _readJson(const std::string &path)
	{
		std::string buf;
		if (OSUtils::readFile(path.c_str(),buf)) {
			try {
				return nlohmann::json::parse(buf);
			} catch ( ... ) {}
		}
		return nlohmann::json::object();
	}

	inline bool _writeJson(const std::string &path,const nlohmann::json &obj)
	{
		std::string buf(obj.dump(2));
		return OSUtils::writeFile(path.c_str(),buf);
	}

	inline std::string _networkBP(const uint64_t nwid,bool create)
	{
		char tmp[64];
		Utils::snprintf(tmp,sizeof(tmp),"%.16llx",nwid);
		std::string p(_path + ZT_PATH_SEPARATOR_S + "network");
		if (create) OSUtils::mkdir(p.c_str());
		p.push_back(ZT_PATH_SEPARATOR);
		p.append(tmp);
		if (create) OSUtils::mkdir(p.c_str());
		return p;
	}
	inline std::string _networkJP(const uint64_t nwid,bool create)
	{
		return (_networkBP(nwid,create) + ZT_PATH_SEPARATOR + "config.json");
	}
	inline std::string _memberBP(const uint64_t nwid,const Address &member,bool create)
	{
		std::string p(_networkBP(nwid,create));
		p.push_back(ZT_PATH_SEPARATOR);
		p.append("member");
		if (create) OSUtils::mkdir(p.c_str());
		p.push_back(ZT_PATH_SEPARATOR);
		p.append(member.toString());
		if (create) OSUtils::mkdir(p.c_str());
		return p;
	}
	inline std::string _memberJP(const uint64_t nwid,const Address &member,bool create)
	{
		return (_memberBP(nwid,member,create) + ZT_PATH_SEPARATOR + "config.json");
	}

	inline std::set<InetAddress> _getAlreadyAllocatedIps(const uint64_t nwid)
	{
		std::set<InetAddress> ips;
		std::string bp(_networkBP(nwid,false) + ZT_PATH_SEPARATOR_S + "member");
		std::vector<std::string> members(OSUtils::listSubdirectories(bp.c_str()));
		for(std::vector<std::string>::iterator m(members.begin());m!=members.end();++m) {
			if (m->length() == ZT_ADDRESS_LENGTH_HEX) {
				nlohmann::json mj = _readJson(bp + ZT_PATH_SEPARATOR_S + *m + ZT_PATH_SEPARATOR_S + "config.json");
				auto ipAssignments = mj["ipAssignments"];
				if (ipAssignments.is_array()) {
					for(unsigned long i=0;i<ipAssignments.size();++i) {
						std::string ipstr = ipAssignments[i];
						InetAddress ip(ipstr);
						if (ip)
							ips.insert(ip);
					}
				}
			}
		}
		return ips;
	}

	// These are const after construction
	Node *const _node;
	std::string _path;

	// Circuit tests outstanding
	struct _CircuitTestEntry
	{
		ZT_CircuitTest *test;
		std::string jsonResults;
	};
	std::map< uint64_t,_CircuitTestEntry > _circuitTests;
	Mutex _circuitTests_m;

	// Last request time by address, for rate limitation
	std::map< std::pair<uint64_t,uint64_t>,uint64_t > _lastRequestTime;
	Mutex _lastRequestTime_m;
};

} // namespace ZeroTier

#endif