#include <boost/bind.hpp>
#include "Log.h"
#include "RouterContext.h"
#include "I2NPProtocol.h"
#include "NetDb.h"
#include "Transports.h"

using namespace i2p::data;

namespace i2p
{
	Transports transports;	
	
	Transports::Transports (): 
		m_Thread (0), m_Work (m_Service),m_NTCPAcceptor (0)
	{		
	}
		
	Transports::~Transports () 
	{ 
		Stop ();
	}	

	void Transports::Start ()
	{
		m_Thread = new std::thread (std::bind (&Transports::Run, this));
		// create acceptors
		auto addresses = context.GetRouterInfo ().GetAddresses ();
		for (auto& address : addresses)
		{
			if (address.transportStyle == RouterInfo::eTransportNTCP)
			{	
				m_NTCPAcceptor = new boost::asio::ip::tcp::acceptor (m_Service,
					boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), address.port));

				LogPrint ("Start listening port ", address.port);	
				auto conn = new i2p::ntcp::NTCPServerConnection (m_Service);
				m_NTCPAcceptor->async_accept(conn->GetSocket (), boost::bind (&Transports::HandleAccept, this, 
					conn, boost::asio::placeholders::error));
			}	
		}	
	}
		
	void Transports::Stop ()
	{	
		for (auto session: m_NTCPSessions)
			delete session.second;
		m_NTCPSessions.clear ();
		delete m_NTCPAcceptor;

		m_Service.stop ();
		if (m_Thread)
		{	
			m_Thread->join (); 
			delete m_Thread;
			m_Thread = 0;
		}	
	}	

	void Transports::AddNTCPSession (i2p::ntcp::NTCPSession * session)
	{
		if (session)
			m_NTCPSessions[std::string ((const char *)session->GetRemoteRouterInfo ().GetIdentHash (), 32)] = session;
	}	

	void Transports::RemoveNTCPSession (i2p::ntcp::NTCPSession * session)
	{
		if (session)
			m_NTCPSessions.erase (std::string ((const char *)session->GetRemoteRouterInfo ().GetIdentHash (), 32));
	}	
		
	void Transports::HandleAccept (i2p::ntcp::NTCPServerConnection * conn, const boost::system::error_code& error)
	{		
		if (!error)
		{
			LogPrint ("Connected from ", conn->GetSocket ().remote_endpoint().address ().to_string ());
			conn->ServerLogin ();
		}
		else
		{
			delete conn;
		}

    	conn = new i2p::ntcp::NTCPServerConnection (m_Service);
		m_NTCPAcceptor->async_accept(conn->GetSocket (), boost::bind (&Transports::HandleAccept, this, 
			conn, boost::asio::placeholders::error));
	}

	i2p::ntcp::NTCPSession * Transports::GetNextNTCPSession ()
	{
		for (auto session: m_NTCPSessions)
			if (session.second->IsEstablished ())
				return session.second;
		return 0;
	}	

	i2p::ntcp::NTCPSession * Transports::FindNTCPSession (const uint8_t * ident)
	{
		auto it = m_NTCPSessions.find (std::string ((const char *)ident,32));
		if (it != m_NTCPSessions.end ())
			return it->second;
		return 0;
	}	

	void Transports::SendMessage (const uint8_t * ident, i2p::I2NPMessage * msg)
	{
		if (!memcmp (ident, i2p::context.GetRouterInfo ().GetIdentHash (), 32))
			// we send it to ourself
			i2p::HandleI2NPMessage (msg);
		else
		{	
			auto session = FindNTCPSession (ident);
			if (!session)
			{
				RouterInfo * r = netdb.FindRouter (ident);
				if (r)
				{	
					auto address = r->GetNTCPAddress ();
					if (address)
						session = new i2p::ntcp::NTCPClient (m_Service, address->host.c_str (), address->port, *r);
				}
			}	
			if (session)
				session->SendI2NPMessage (msg);
			else
				LogPrint ("Session not found"); 
		}	
	}	
}