/*
 * Copyright (C) 2018 Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
 * Author: Ortega Froysa, Nicolás <nortega@themusicinnoise.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "neocomm/node.hpp"

#include <iostream>
#include <fstream>
#include <stdexcept>

neocomm::node::node(unsigned short port) {
#ifdef WOE32
	gnutls_global_init();
#endif
	try {
		dht_node.run(port,
				dht::crypto::generateIdentity(), true);
	}
	catch(const std::exception &e)
	{
		// rethrow exception
		throw e;
	}
}

neocomm::node::node(const std::string &node_file,
		unsigned short port) {
#ifdef WOE32
	gnutls_global_init();
#endif
	try {
		dht_node.run(port,
				dht::crypto::generateIdentity(), true);
	}
	catch(const std::exception &e)
	{
		// rethrow exception
		throw e;
	}

	import_nodes(node_file);
}

neocomm::node::~node() {
	dht_node.join();
#ifdef WOE32
	gnutls_global_deinit();
#endif
}

void neocomm::node::connect(const std::string &address,
		unsigned short port) {
	if(not dht_node.isRunning())
		throw std::runtime_error("Node is not yet running.");
	dht_node.bootstrap(address, std::to_string(port));
}

void neocomm::node::import_nodes(
		const std::string &node_file) {
	if(not dht_node.isRunning())
		throw std::runtime_error("Node is not yet running.");
	msgpack::unpacker upak;
	{
		std::ifstream import_file(node_file, std::ios::binary
				bitor std::ios::ate);
		if(not import_file.is_open())
		{
			throw std::runtime_error("Failed to open file " +
					node_file);
		}
		auto file_size = import_file.tellg();
		import_file.seekg(0, std::ios::beg);
		upak.reserve_buffer(file_size);
		import_file.read(upak.buffer(), file_size);
	}

	msgpack::object_handle obj_handler;
	while(upak.next(obj_handler))
	{
		auto imported_nodes =
			obj_handler.get().as<
			std::vector<dht::NodeExport>>();
		dht_node.bootstrap(imported_nodes);
	}
}

void neocomm::node::export_nodes(
		const std::string &node_file) {
	if(not dht_node.isRunning())
		throw std::runtime_error("Node is not yet running.");
	std::ofstream export_file(node_file, std::ios::binary);
	if(not export_file.is_open())
	{
		throw std::runtime_error("Failed to open file " +
				node_file);
	}

	msgpack::pack(export_file, dht_node.exportNodes());
}