#include <boost/bind.hpp>
#include <boost/bind/protect.hpp>
#include <boost/lexical_cast.hpp>
#include "base64.h"
#include "Log.h"
#include "Tunnel.h"
#include "TransitTunnel.h"
#include "Transports.h"
#include "NetDb.h"
#include "HTTPServer.h"

namespace i2p
{
namespace util
{

	const std::string HTTPConnection::itoopieImage = 
		"<img alt=\"\" src=\"data:image/png;base64,"
		"iVBORw0KGgoAAAANSUhEUgAAADYAAABECAYAAAG9qPaBAAAACXBIWXMAAA7DAAAOwwHHb6h"
		"kAAAStElEQVR4nMU7CXRUVbL1ek0nTUI6BLNAICEIhESWQAAFgsH8D4g5IwSHg6PfEQ/E0T"
		"gIBIMIGPDIyBiFgcAB/YOj8kVAZIkywyI4yBbjINFIZAeZxASykU53esv9Vbffe3R3ujuds"
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		"V1CxShgFOrGuAxuq4J/CrW53fcAOwiBWBH2ZQhCY3HLhwoWRiZMTaxQKBZiMJrh+9Pqg119"
		"/vUxJFTIyMtKKCopqP1nzScTNSzcXxcXFmdPT0+N5y2nTpikHDhzYl6MHaMVUgy0vu1Iz2n"
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		"+U0vclvzH+PAAAAAElFTkSuQmCC"
		"\" />";
	
	namespace misc_strings 
	{

		const char name_value_separator[] = { ':', ' ' };
		const char crlf[] = { '\r', '\n' };

	} // namespace misc_strings

	std::vector<boost::asio::const_buffer> HTTPConnection::reply::to_buffers(int status)
	{
		std::vector<boost::asio::const_buffer> buffers;
		if (headers.size () > 0)
		{
			switch (status)
			{
				case 105: buffers.push_back(boost::asio::buffer("HTTP/1.0 105 Name Not Resolved\r\n")); break;
				case 200: buffers.push_back(boost::asio::buffer("HTTP/1.0 200 OK\r\n")); break;
				case 400: buffers.push_back(boost::asio::buffer("HTTP/1.0 400 Bad Request\r\n")); break;
				case 404: buffers.push_back(boost::asio::buffer("HTTP/1.0 404 Not Found\r\n")); break;
				case 408: buffers.push_back(boost::asio::buffer("HTTP/1.0 408 Request Timeout\r\n")); break;
				case 500: buffers.push_back(boost::asio::buffer("HTTP/1.0 500 Internal Server Error\r\n")); break;
				case 502: buffers.push_back(boost::asio::buffer("HTTP/1.0 502 Bad Gateway\r\n")); break;
				case 503: buffers.push_back(boost::asio::buffer("HTTP/1.0 503 Not Implemented\r\n")); break;
				case 504: buffers.push_back(boost::asio::buffer("HTTP/1.0 504 Gateway Timeout\r\n")); break;
				default:
					buffers.push_back(boost::asio::buffer("HTTP/1.0 200 OK\r\n"));
			}

			for (std::size_t i = 0; i < headers.size(); ++i)
			{
				header& h = headers[i];
				buffers.push_back(boost::asio::buffer(h.name));
				buffers.push_back(boost::asio::buffer(misc_strings::name_value_separator));
				buffers.push_back(boost::asio::buffer(h.value));
				buffers.push_back(boost::asio::buffer(misc_strings::crlf));
			}
			buffers.push_back(boost::asio::buffer(misc_strings::crlf));
		}	
		buffers.push_back(boost::asio::buffer(content));
		return buffers;
	}

	void HTTPConnection::Terminate ()
	{
		if (m_Stream)
		{	
			m_Stream->Close ();
			DeleteStream (m_Stream);	
		}
		m_Socket->close ();
		delete this;
	}

	void HTTPConnection::Receive ()
	{
		m_Socket->async_read_some (boost::asio::buffer (m_Buffer, 8192),
			 boost::bind(&HTTPConnection::HandleReceive, this,
				 boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
	}

	void HTTPConnection::HandleReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
	{
		if (!ecode)
  		{
			m_Buffer[bytes_transferred] = 0;
			RunRequest();
		}
		else if (ecode != boost::asio::error::operation_aborted)
			Terminate ();
	}

	void HTTPConnection::RunRequest ()
	{
		auto address = ExtractAddress ();
		if (address.length () > 1) // not just '/'
		{
			std::string uri ("/"), b32;
			size_t pos = address.find ('/', 1);
			if (pos == std::string::npos)
				b32 = address.substr (1); // excluding leading '/' to end of line
			else
			{
				b32 = address.substr (1, pos - 1); // excluding leading '/' to next '/'
				uri = address.substr (pos); // rest of line
			}	

			HandleDestinationRequest (b32, uri); 
		}	
		else	  
			HandleRequest ();
	}

	std::string HTTPConnection::ExtractAddress ()
	{
		char * get = strstr (m_Buffer, "GET");
		if (get)
		{
			char * http = strstr (get, "HTTP");
			if (http)
				return std::string (get + 4, http - get - 5);
		}	
		return "";
	}	
	
	void HTTPConnection::HandleWriteReply (const boost::system::error_code& ecode)
	{
		Terminate ();
	}

	void HTTPConnection::HandleWrite (const boost::system::error_code& ecode)
	{
		if (ecode || (m_Stream && !m_Stream->IsOpen ()))
			Terminate ();
		else // data keeps coming
			AsyncStreamReceive ();
	}

	void HTTPConnection::HandleRequest ()
	{
		std::stringstream s;
		s << "<html>";
		FillContent (s);
		s << "</html>";
		SendReply (s.str ());
	}	

	void HTTPConnection::FillContent (std::stringstream& s)
	{
		s << "Our external address:" << "<BR>" << "<BR>";
		for (auto& address : i2p::context.GetRouterInfo().GetAddresses())
		{
			switch (address.transportStyle) 
			{
				case i2p::data::RouterInfo::eTransportNTCP:
					s << "NTCP&nbsp;&nbsp;";
				break;
				case i2p::data::RouterInfo::eTransportSSU:
					s << "SSU&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
				break;
				default:
					s << "Unknown&nbsp;&nbsp;";
			}
			s << address.host.to_string() << ":" << address.port << "<BR>";
		}

		s << "<P>Tunnels</P>";
		for (auto it: i2p::tunnel::tunnels.GetOutboundTunnels ())
		{	
			it->GetTunnelConfig ()->Print (s);
			if (it->GetTunnelPool () && !it->GetTunnelPool ()->IsExploratory ())
				s << " " << "Pool";
			if (it->IsFailed ())
				s << " " << "Failed";
			s << " " << (int)it->GetNumSentBytes () << "<BR>";
		}	

		for (auto it: i2p::tunnel::tunnels.GetInboundTunnels ())
		{	
			it.second->GetTunnelConfig ()->Print (s);
			if (it.second->GetTunnelPool () && !it.second->GetTunnelPool ()->IsExploratory ())
				s << " " << "Pool";
			if (it.second->IsFailed ())
				s << " " << "Failed";
			s << " " << (int)it.second->GetNumReceivedBytes () << "<BR>";
		}	
		
		s << "<P>Transit tunnels</P>";
		for (auto it: i2p::tunnel::tunnels.GetTransitTunnels ())
		{	
			if (dynamic_cast<i2p::tunnel::TransitTunnelGateway *>(it.second))
				s << it.second->GetTunnelID () << "-->";
			else if (dynamic_cast<i2p::tunnel::TransitTunnelEndpoint *>(it.second))
				s << "-->" << it.second->GetTunnelID ();
			else
				s << "-->" << it.second->GetTunnelID () << "-->";
			s << " " << it.second->GetNumTransmittedBytes () << "<BR>";
		}	

		s << "<P>Transports</P>";
		s << "NTCP<BR>";
		for (auto it: i2p::transports.GetNTCPSessions ())
		{	
			// RouterInfo of incoming connection doesn't have address
			bool outgoing = it.second->GetRemoteRouterInfo ().GetNTCPAddress ();
			if (it.second->IsEstablished ())
			{
				if (outgoing) s << "-->";
				s << it.second->GetRemoteRouterInfo ().GetIdentHashAbbreviation () <<  ": " 
					<< it.second->GetSocket ().remote_endpoint().address ().to_string ();
				if (!outgoing) s << "-->";
				s << "<BR>";
			}	
		}	
		auto ssuServer = i2p::transports.GetSSUServer ();
		if (ssuServer)
		{
			s << "<BR>SSU<BR>";
			for (auto it: ssuServer->GetSessions ())
			{
				// incoming connections don't have remote router
				bool outgoing = it.second->GetRemoteRouter ();
				auto endpoint = it.second->GetRemoteEndpoint ();
				if (outgoing) s << "-->";
				s << endpoint.address ().to_string () << ":" << endpoint.port ();
				if (!outgoing) s << "-->";
				s << "<BR>";
			}	
		}	
		s << "<p><a href=\"zmw2cyw2vj7f6obx3msmdvdepdhnw2ctc4okza2zjxlukkdfckhq\">Flibusta</a></p>";
	}	

	void HTTPConnection::HandleDestinationRequest (const std::string& address, const std::string& uri)
	{
		i2p::data::IdentHash destination;
		std::string fullAddress;
		if (address.find(".b32.i2p") != std::string::npos)
		{
			if (i2p::data::Base32ToByteStream(address.c_str(), address.length() - strlen(".b32.i2p"), (uint8_t *)destination, 32) != 32)
			{
				LogPrint ("Invalid Base32 address ", address);
				SendReply ("<html>" + itoopieImage + "<br>Invalid Base32 address", 400);
				return;
			}
			fullAddress = address;
		}
		else
		{
			if (address.find(".i2p") != std::string::npos)
			{
				auto addr = i2p::data::netdb.FindAddress(address);
				if (!addr)
				{
					LogPrint ("Unknown address ", address);
					SendReply ("<html>" + itoopieImage + "<br>Unknown address " + address + "</html>", 105);
					return;
				}
				destination = *addr;
				fullAddress = address;
			}
			else
			{
				if (i2p::data::Base32ToByteStream(address.c_str(), address.length(), (uint8_t *)destination, 32) != 32)
				{
					LogPrint("Invalid Base32 address ", address);
					SendReply("<html>" + itoopieImage + "<br>Invalid Base32 address", 400);
					return;
				}
				fullAddress = address + ".b32.i2p";
			}
		}
			
		auto leaseSet = i2p::data::netdb.FindLeaseSet (destination);
		if (!leaseSet || !leaseSet->HasNonExpiredLeases ())
		{
			i2p::data::netdb.Subscribe(destination);
			std::this_thread::sleep_for (std::chrono::seconds(10)); // wait for 10 seconds
			leaseSet = i2p::data::netdb.FindLeaseSet (destination);
			if (!leaseSet || !leaseSet->HasNonExpiredLeases ()) // still no LeaseSet
			{
				SendReply (leaseSet ? "<html>" + itoopieImage + "<br>Leases expired</html>" : "<html>" + itoopieImage + "LeaseSet not found</html>", 504);
				return;
			}	
		}
		if (!m_Stream)	
			m_Stream = i2p::stream::CreateStream (*leaseSet);
		if (m_Stream)
		{
			std::string request = "GET " + uri + " HTTP/1.1\n Host:" + fullAddress + "\n";
			m_Stream->Send ((uint8_t *)request.c_str (), request.length (), 10);			
			AsyncStreamReceive ();
		}	
	}	
	
	void HTTPConnection::AsyncStreamReceive ()
	{
		if (m_Stream)
			m_Stream->AsyncReceive (boost::asio::buffer (m_StreamBuffer, 8192),
				boost::protect (boost::bind (&HTTPConnection::HandleStreamReceive, this, 
					boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)),
				45); // 45 seconds timeout
	}

	void HTTPConnection::HandleStreamReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
	{
		if (bytes_transferred)
		{
			boost::asio::async_write (*m_Socket, boost::asio::buffer (m_StreamBuffer, bytes_transferred),
        		boost::bind (&HTTPConnection::HandleWrite, this, boost::asio::placeholders::error));
		}
		else
		{
			if (m_Stream && m_Stream->IsOpen ())
				SendReply ("<html>" + itoopieImage + "<br>Not responding</html>", 504);
			else
				Terminate ();
		}	
	}

	void HTTPConnection::SendReply (const std::string& content, int status)
	{
		m_Reply.content = content;
		m_Reply.headers.resize(2);
		m_Reply.headers[0].name = "Content-Length";
		m_Reply.headers[0].value = boost::lexical_cast<std::string>(m_Reply.content.size());
		m_Reply.headers[1].name = "Content-Type";
		m_Reply.headers[1].value = "text/html";

		boost::asio::async_write (*m_Socket, m_Reply.to_buffers(status),
        	boost::bind (&HTTPConnection::HandleWriteReply, this, 
				boost::asio::placeholders::error));
	}
	
	HTTPServer::HTTPServer (int port): 
		m_Thread (nullptr), m_Work (m_Service), 
		m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), port)),
		m_NewSocket (nullptr)
	{
		
	}

	HTTPServer::~HTTPServer ()
	{
		Stop ();
	}

	void HTTPServer::Start ()
	{
		m_Thread = new std::thread (std::bind (&HTTPServer::Run, this));
		m_Acceptor.listen ();
		Accept ();
	}

	void HTTPServer::Stop ()
	{
		m_Acceptor.close();
		m_Service.stop ();
		if (m_Thread)
        {       
            m_Thread->join (); 
            delete m_Thread;
            m_Thread = nullptr;
        }    
	}

	void HTTPServer::Run ()
	{
		m_Service.run ();
	}	

	void HTTPServer::Accept ()
	{
		m_NewSocket = new boost::asio::ip::tcp::socket (m_Service);
		m_Acceptor.async_accept (*m_NewSocket, boost::bind (&HTTPServer::HandleAccept, this,
			boost::asio::placeholders::error));
	}

	void HTTPServer::HandleAccept(const boost::system::error_code& ecode)
	{
		if (!ecode)
		{
			CreateConnection(m_NewSocket); // new HTTPConnection(m_NewSocket);
			Accept ();
		}
	}	

	void HTTPServer::CreateConnection(boost::asio::ip::tcp::socket * m_NewSocket)
	{
		new HTTPConnection (m_NewSocket);
	}

}
}