/*
 *  Copyright © 2006 Alon Zakai ('Kripken') <kripkensteiner@gmail.com>
 *
 *  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 2, 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  Thank You: Some code portions were derived from BSD-licensed work by
 *             Arvid Norberg, and GPL-licensed work by Christophe Dumez
 */


//------------------
// TODO:
//
// The DHT capability requires UDP. We need to check that this port is in fact
// open, just like the normal TCP port for bittorrent.
//
// Wait for answers about what to do with the router.*torrent.com's...
//
//------------------


//-----------------
// INCLUDES
//-----------------

#include <Python.h>

#include <boost/filesystem/exception.hpp>
#include <boost/filesystem/operations.hpp>

#include "libtorrent/entry.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/identify_client.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/storage.hpp"
#include "libtorrent/hasher.hpp"
#include "libtorrent/ip_filter.hpp"

using namespace libtorrent;


//-----------------
// CONSTANTS
//-----------------

#ifdef AMD64
#define python_long int
#else
#define python_long long
#endif

#define EVENT_NULL            				0
#define EVENT_FINISHED        				1
#define EVENT_PEER_ERROR      				2
#define EVENT_INVALID_REQUEST 				3
#define EVENT_FILE_ERROR						4
#define EVENT_HASH_FAILED_ERROR				5
#define EVENT_PEER_BAN_ERROR					6
#define EVENT_FASTRESUME_REJECTED_ERROR	8
#define EVENT_TRACKER							9
#define EVENT_OTHER				           	10

#define STATE_QUEUED           0
#define STATE_CHECKING         1
#define STATE_CONNECTING       2
#define STATE_DOWNLOADING_META 3
#define STATE_DOWNLOADING      4
#define STATE_FINISHED         5
#define STATE_SEEDING          6
#define STATE_ALLOCATING       7

#define DHT_ROUTER_PORT 6881


//-----------------
// TYPES
//-----------------

typedef long				  unique_ID_t;
typedef std::vector<bool> filter_out_t;
typedef std::string		  torrent_name_t;

struct torrent_t {
	torrent_handle handle;
	unique_ID_t    unique_ID;
};

typedef std::vector<torrent_t> torrents_t;
typedef torrents_t::iterator   torrents_t_iterator;


//---------------------------
// MODULE-GLOBAL VARIABLES
//---------------------------

long				   M_unique_counter	= 0;
session_settings *M_settings 		   = NULL;
session          *M_ses 				= NULL;
PyObject         *M_constants		   = NULL;
ip_filter		  *M_the_filter		= NULL;
torrents_t       *M_torrents        = NULL;


//------------------------
// Exception types & macro
//------------------------

static PyObject *PyTorrentCoreError;

static PyObject *InvalidEncodingError;
static PyObject *FilesystemError;
static PyObject *DuplicateTorrentError;
static PyObject *InvalidTorrentError;

#define PYTORRENTCORE_RAISE_PTR(e,s) { printf("Raising error: %s\r\n", s); PyErr_SetString(e, s); return NULL; }
#define PYTORRENTCORE_RAISE_INT(e,s) { printf("Raising error: %s\r\n", s); PyErr_SetString(e, s); return -1; }


//---------------------
// Internal functions
//---------------------

bool empty_name_check(const std::string & name)
{
	return 1;
}

long handle_exists(torrent_handle &handle)
{
	for (unsigned long i = 0; i < M_torrents->size(); i++)
		if ((*M_torrents)[i].handle == handle)
			return 1;

	return 0;
}

long get_torrent_index(torrent_handle &handle)
{
	for (unsigned long i = 0; i < M_torrents->size(); i++)
		if ((*M_torrents)[i].handle == handle)
		{
//			printf("Found: %li\r\n", i);
			return i;
		}

	PYTORRENTCORE_RAISE_INT(PyTorrentCoreError, "Handle not found.");
}

long get_index_from_unique_ID(long unique_ID)
{
	assert(M_handles->size() == M_unique_IDs->size());

	for (unsigned long i = 0; i < M_torrents->size(); i++)
		if ((*M_torrents)[i].unique_ID == unique_ID)
			return i;

	PYTORRENTCORE_RAISE_INT(PyTorrentCoreError, "No such unique_ID.");
}

long internal_add_torrent(std::string const&             torrent_name,
								  float                          preferred_ratio,
								  bool                           compact_mode,
								  boost::filesystem::path const& save_path)
{
	std::ifstream in(torrent_name.c_str(), std::ios_base::binary);
	in.unsetf(std::ios_base::skipws);
	entry e;
	e = bdecode(std::istream_iterator<char>(in), std::istream_iterator<char>());

	torrent_info t(e);

	entry resume_data;
	try
	{
		std::stringstream s;
		s << torrent_name << ".fastresume";
		boost::filesystem::ifstream resumeFile(s.str(), std::ios_base::binary);
		resumeFile.unsetf(std::ios_base::skipws);
		resume_data = bdecode(std::istream_iterator<char>(resumeFile),
									 std::istream_iterator<char>());
	} catch (invalid_encoding&) {}
	  catch (boost::filesystem::filesystem_error&) {}

	// Create new torrent object

	torrent_t new_torrent;

	torrent_handle h = M_ses->add_torrent(t, save_path, resume_data, compact_mode, 16 * 1024);

//	h.set_max_connections(60); // at some point we should use this
	h.set_max_uploads(-1);
	h.set_ratio(preferred_ratio);
	new_torrent.handle = h;

	new_torrent.unique_ID = M_unique_counter;
	M_unique_counter++;

	M_torrents->push_back(new_torrent);

	return (new_torrent.unique_ID);
}

void internal_remove_torrent(long index)
{
	assert(index < M_torrents->size());

	torrent_handle& h = M_torrents->at(index).handle;

	M_ses->remove_torrent(h);

	torrents_t_iterator it = M_torrents->begin() + index;
	M_torrents->erase(it);
}

long get_peer_index(tcp::endpoint addr, std::vector<peer_info> const& peers)
{
	long index = -1;

	for (unsigned long i = 0; i < peers.size(); i++)
		if (peers[i].ip == addr)
			index = i;

	return index;
}

// The following function contains code by Christophe Dumez and Arvid Norberg
void internal_add_files(torrent_info&                  t,
								boost::filesystem::path const& p,
								boost::filesystem::path const& l)
{
	boost::filesystem::path f(p / l); // change default checker, perhaps?
	if (is_directory(f))
	{
		for (boost::filesystem::directory_iterator i(f), end; i != end; ++i)
			internal_add_files(t, p, l / i->leaf());
	} else
		t.add_file(l, file_size(f));
}

long count_DHT_peers(entry &state)
{
	long num_peers = 0;
	entry *nodes = state.find_key("nodes");
	if (nodes)
	{
		entry::list_type &peers = nodes->list();
		entry::list_type::const_iterator i;
		i = peers.begin();

		while (i != peers.end())
		{
			num_peers++;
			i++;
		}
	}

	return num_peers;
}


//=====================
// External functions
//=====================

static PyObject *torrent_init(PyObject *self, PyObject *args)
{
	printf("pytorrent_core, using libtorrent %s. Compiled with NDEBUG value: %d\r\n",
			 LIBTORRENT_VERSION,
			 NDEBUG);

	// Tell Boost that we are on *NIX, so bloody '.'s are ok inside a directory name!
	boost::filesystem::path::default_name_check(empty_name_check);

	char *client_ID, *user_agent;
	python_long v1,v2,v3,v4;

	if (!PyArg_ParseTuple(args, "siiiis", &client_ID, &v1, &v2, &v3, &v4, &user_agent))
		return NULL;

	M_settings  = new session_settings;
	M_ses       = new session(fingerprint(client_ID, v1, v2, v3, v4));

	M_torrents	= new torrents_t;
	M_torrents->reserve(10); // pretty cheap, just 10

	// Init values

	M_settings->user_agent = std::string(user_agent);

	M_ses->set_max_half_open_connections(-1);
	M_ses->set_download_rate_limit(-1);
	M_ses->set_upload_rate_limit(-1);

	M_ses->set_settings(*M_settings);
	M_ses->set_severity_level(alert::debug);

	M_constants = Py_BuildValue("{s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i}",
								"EVENT_NULL",								EVENT_NULL,
								"EVENT_FINISHED",							EVENT_FINISHED,
								"EVENT_PEER_ERROR",						EVENT_PEER_ERROR,
								"EVENT_INVALID_REQUEST",				EVENT_INVALID_REQUEST,
								"EVENT_FILE_ERROR",						EVENT_FILE_ERROR,
								"EVENT_HASH_FAILED_ERROR",				EVENT_HASH_FAILED_ERROR,
								"EVENT_PEER_BAN_ERROR",					EVENT_PEER_BAN_ERROR,
								"EVENT_FASTRESUME_REJECTED_ERROR", 	EVENT_FASTRESUME_REJECTED_ERROR,
								"EVENT_TRACKER",							EVENT_TRACKER,
								"EVENT_OTHER",								EVENT_OTHER,
								"STATE_QUEUED",							STATE_QUEUED,
								"STATE_CHECKING",							STATE_CHECKING,
								"STATE_CONNECTING",						STATE_CONNECTING,
								"STATE_DOWNLOADING_META",				STATE_DOWNLOADING_META,
								"STATE_DOWNLOADING",						STATE_DOWNLOADING,
								"STATE_FINISHED",							STATE_FINISHED,
								"STATE_SEEDING",							STATE_SEEDING,
								"STATE_ALLOCATING",						STATE_ALLOCATING);

	Py_INCREF(Py_None); return Py_None;
};

static PyObject *torrent_quit(PyObject *self, PyObject *args)
{
	delete M_ses; // SLOWPOKE because of waiting for the trackers before shutting down
	delete M_settings;
	delete M_torrents;

	Py_DECREF(M_constants);

	Py_INCREF(Py_None); return Py_None;
};

static PyObject *torrent_save_fastresume(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	const char *torrent_name;
	if (!PyArg_ParseTuple(args, "is", &unique_ID, &torrent_name))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	torrent_handle& h = M_torrents->at(index).handle;
	// For valid torrents, save fastresume data
	if (h.is_valid() && h.has_metadata())
	{
		h.pause();

		entry data = h.write_resume_data();

		std::stringstream s;
		s << torrent_name << ".fastresume";

		boost::filesystem::ofstream out(s.str(), std::ios_base::binary);

		out.unsetf(std::ios_base::skipws);

		bencode(std::ostream_iterator<char>(out), data);

		h.resume();

		Py_INCREF(Py_None); return Py_None;
	} else
		PYTORRENTCORE_RAISE_PTR(PyTorrentCoreError, "Invalid handle or no metadata for fastresume.");
}

static PyObject *torrent_set_max_half_open(PyObject *self, PyObject *args)
{
	python_long arg;
	if (!PyArg_ParseTuple(args, "i", &arg))
		return NULL;

	M_ses->set_max_half_open_connections(arg);

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_set_download_rate_limit(PyObject *self, PyObject *args)
{
	python_long arg;
	if (!PyArg_ParseTuple(args, "i", &arg))
		return NULL;

//	printf("Capping download to %d bytes per second\r\n", (int)arg);
	M_ses->set_download_rate_limit(arg);

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_set_upload_rate_limit(PyObject *self, PyObject *args)
{
	python_long arg;
	if (!PyArg_ParseTuple(args, "i", &arg))
		return NULL;

//	printf("Capping upload to %d bytes per second\r\n", (int)arg);
	M_ses->set_upload_rate_limit(arg);

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_set_listen_on(PyObject *self, PyObject *args)
{
	python_long port_start, port_end;
	if (!PyArg_ParseTuple(args, "ii", &port_start, &port_end))
		return NULL;

	M_ses->listen_on(std::make_pair(port_start, port_end), "");

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_is_listening(PyObject *self, PyObject *args)
{
	long ret = (M_ses->is_listening() != 0);

	return Py_BuildValue("i", ret);
}

static PyObject *torrent_listening_port(PyObject *self, PyObject *args)
{
	return Py_BuildValue("i", (python_long)M_ses->listen_port());
}

static PyObject *torrent_set_max_uploads(PyObject *self, PyObject *args)
{
	python_long max_up;
	if (!PyArg_ParseTuple(args, "i", &max_up))
		return NULL;

	M_ses->set_max_uploads(max_up);

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_set_max_connections(PyObject *self, PyObject *args)
{
	python_long max_conn;
	if (!PyArg_ParseTuple(args, "i", &max_conn))
		return NULL;

//	printf("Setting max connections: %d\r\n", max_conn);
	M_ses->set_max_connections(max_conn);

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_add_torrent(PyObject *self, PyObject *args)
{
	const char *name, *save_dir;
	python_long compact;
	if (!PyArg_ParseTuple(args, "ssi", &name, &save_dir, &compact))
		return NULL;

	boost::filesystem::path save_dir_2	(save_dir, empty_name_check);

	try
	{
		long ret = internal_add_torrent(name, 0, compact, save_dir_2);
		if (PyErr_Occurred())
			return NULL;
		else
			return Py_BuildValue("i", ret);
	}
	catch (invalid_encoding&)
	{	PYTORRENTCORE_RAISE_PTR(InvalidEncodingError, ""); }
	catch (invalid_torrent_file&)
	{	PYTORRENTCORE_RAISE_PTR(InvalidTorrentError, ""); }
	catch (boost::filesystem::filesystem_error&)
	{	PYTORRENTCORE_RAISE_PTR(FilesystemError, ""); }
	catch (duplicate_torrent&)
	{	PYTORRENTCORE_RAISE_PTR(DuplicateTorrentError, ""); }
}

static PyObject *torrent_remove_torrent(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	internal_remove_torrent(index);

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_get_num_torrents(PyObject *self, PyObject *args)
{
	return Py_BuildValue("i", M_torrents->size());
}

static PyObject *torrent_reannounce(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	M_torrents->at(index).handle.force_reannounce();

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_pause(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	M_torrents->at(index).handle.pause();

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_resume(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	M_torrents->at(index).handle.resume();

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_get_torrent_state(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	torrent_t				&t = M_torrents->at(index);
	torrent_status			 s = t.handle.status();
	const torrent_info	&i = t.handle.get_torrent_info();

	std::vector<peer_info> peers;
	t.handle.get_peer_info(peers);

	long total_seeds = 0;
	long total_peers = 0;

	for (unsigned long i = 0; i < peers.size(); i++)
		if (peers[i].seed)
			total_seeds++;
		else
			total_peers++;

	return Py_BuildValue("{s:s,s:l,s:l,s:l,s:l,s:f,s:f,s:d,s:f,s:l,s:l,s:s,s:s,s:f,s:d,s:l,s:l,s:l,s:d,s:l,s:l,s:l,s:l,s:l,s:l,s:d,s:d,s:l,s:l}",
					"name",					t.handle.get_torrent_info().name().c_str(),
					"num_files", 			 t.handle.get_torrent_info().num_files()
					"state",					 s.state,
					"num_peers", 			 s.num_peers,
					"num_seeds", 			 s.num_seeds,
					"distributed_copies", s.distributed_copies,
					"download_rate", 		 s.download_rate,
					"total_download", 	 double(s.total_download), // WAS: payload in the middle there
					"upload_rate", 		 s.upload_rate,
					"total_upload", 		 long(s.total_upload),     // WAS: payload
//"ratio",	float(-1),//float(s.total_payload_download)/float(s.total_payload_upload),
					"tracker_ok",			 !s.current_tracker.empty(),
					"next_announce",		 boost::posix_time::to_simple_string(s.next_announce).c_str(),
					"tracker",				 s.current_tracker.c_str(),
					"progress",				 float(s.progress),
					"total_done",			 double(s.total_done),
					"pieces",			 	 long(s.pieces),
					"pieces_done",			 long(s.num_pieces),
					"block_size",			 long(s.block_size),
					"total_size",			 double(i.total_size()),
					"piece_length",		 long(i.piece_length()),
					"num_pieces",			 long(i.num_pieces()),
					"total_seeds",			 total_seeds,
					"total_peers",			 total_peers,
					"is_paused",			 long(t.handle.is_paused()),
					"is_seed",				 long(t.handle.is_seed()),
					"total_wanted",		 double(s.total_wanted),
					"total_wanted_done",	 double(s.total_wanted_done),
					"num_complete",		 long(s.num_complete),
					"num_incomplete",		 long(s.num_incomplete));
};

static PyObject *torrent_pop_event(PyObject *self, PyObject *args)
{
	std::auto_ptr<alert> a;

	a = M_ses->pop_alert();

	alert *popped_alert = a.get();

	if (!popped_alert)
	{
		Py_INCREF(Py_None); return Py_None;
	} else if (dynamic_cast<torrent_finished_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<torrent_finished_alert*>(popped_alert))->handle;

		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i}", "event_type", EVENT_FINISHED,
										"unique_ID",
											M_torrents->at(index).unique_ID);
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<peer_error_alert*>(popped_alert))
	{
		peer_id     peer_ID = (dynamic_cast<peer_error_alert*>(popped_alert))->pid;
		std::string peer_IP =
				 (dynamic_cast<peer_error_alert*>(popped_alert))->ip.address().to_string();

		return Py_BuildValue("{s:i,s:s,s:s,s:s}",	"event_type", EVENT_PEER_ERROR,
																"client_ID",  identify_client(peer_ID).c_str(),
																"ip",			 peer_IP.c_str(),
																"message",   a->msg().c_str()                 );
	} else if (dynamic_cast<invalid_request_alert*>(popped_alert))
	{
		peer_id peer_ID = (dynamic_cast<invalid_request_alert*>(popped_alert))->pid;

		return Py_BuildValue("{s:i,s:s,s:s}",
									"event_type", EVENT_INVALID_REQUEST,
									"client_ID",  identify_client(peer_ID).c_str(),
							 		"message",   a->msg().c_str()                 );
	} else if (dynamic_cast<file_error_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<file_error_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s}",
										"event_type", EVENT_FILE_ERROR,
										"unique_ID", M_torrents->at(index).unique_ID,
										"message",   a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<hash_failed_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<hash_failed_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:i,s:s}",
										"event_type",  EVENT_HASH_FAILED_ERROR,
										"unique_ID",  M_torrents->at(index).unique_ID,
										"piece_index",
										 long((dynamic_cast<hash_failed_alert*>(popped_alert))->piece_index),
										"message",    a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<peer_ban_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<peer_ban_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;
		std::string peer_IP = (dynamic_cast<peer_ban_alert*>(popped_alert))->ip.address().to_string();

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s,s:s}",
										"event_type",  EVENT_PEER_BAN_ERROR,
										"unique_ID",  M_torrents->at(index).unique_ID,
										"ip",			  peer_IP.c_str(),
										"message",    a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<fastresume_rejected_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<fastresume_rejected_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s}",
										"event_type",  EVENT_FASTRESUME_REJECTED_ERROR,
										"unique_ID",  M_torrents->at(index).unique_ID,
										"message",    a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<tracker_announce_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<tracker_announce_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s,s:s}",
										"event_type",  		EVENT_TRACKER,
										"unique_ID",
											M_torrents->at(index).unique_ID,
										"tracker_status",	"Announce sent",
										"message",    		a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<tracker_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<tracker_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s,s:s}",
										"event_type",  		EVENT_TRACKER,
										"unique_ID",
											M_torrents->at(index).unique_ID,
										"tracker_status",	"Bad response (status code=?)",
										"message",    		a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<tracker_reply_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<tracker_reply_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s,s:s}",
										"event_type",  		EVENT_TRACKER,
										"unique_ID",
											M_torrents->at(index).unique_ID,
										"tracker_status",	"Announce succeeded",
										"message",    		a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	} else if (dynamic_cast<tracker_warning_alert*>(popped_alert))
	{
		torrent_handle handle = (dynamic_cast<tracker_warning_alert*>(popped_alert))->handle;
		long index = get_torrent_index(handle);
		if (PyErr_Occurred())
			return NULL;

		if (handle_exists(handle))
			return Py_BuildValue("{s:i,s:i,s:s,s:s}",
										"event_type",  		EVENT_TRACKER,
										"unique_ID",
											M_torrents->at(index).unique_ID,
										"tracker_status",	"Warning in response",
										"message",    		a->msg().c_str()                 );
		else
		{ Py_INCREF(Py_None); return Py_None; }
	}

	return Py_BuildValue("{s:i,s:s}", "event_type", EVENT_OTHER,
												 "message",   a->msg().c_str()     );
}

static PyObject *torrent_get_session_info(PyObject *self, PyObject *args)
{
	session_status s = M_ses->status();

	return Py_BuildValue("{s:l,s:f,s:f,s:f,s:f,s:l}",
								"has_incoming_connections",	long(s.has_incoming_connections),
								"upload_rate",						float(s.upload_rate),
								"download_rate",					float(s.download_rate),
								"payload_upload_rate",			float(s.payload_upload_rate),
								"payload_download_rate",		float(s.payload_download_rate),
								"num_peers",						long(s.num_peers));
}

static PyObject *torrent_get_peer_info(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	std::vector<peer_info> peers;
	M_torrents->at(index).handle.get_peer_info(peers);

	PyObject *peer_info;

	PyObject *ret = PyTuple_New(peers.size());

	for (unsigned long i = 0; i < peers.size(); i++)
	{
		std::vector<bool> &pieces      = peers[i].pieces;
		unsigned long      pieces_had  = 0;

		for (unsigned long piece = 0; piece < pieces.size(); piece++)
			if (pieces[piece])
				pieces_had++;

		peer_info = Py_BuildValue(
				"{s:f,s:d,s:f,s:d,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:s,s:i,s:s,s:f}",
				"download_speed", 			float(peers[i].down_speed),
				"total_download", 			double(peers[i].total_download),
				"upload_speed", 				float(peers[i].up_speed),
				"total_upload", 				double(peers[i].total_upload),
				"download_queue_length",	long(peers[i].download_queue_length),
				"upload_queue_length", 		long(peers[i].upload_queue_length),
				"is_interesting",				long((peers[i].flags & peer_info::interesting) != 0),
				"is_choked",					long((peers[i].flags & peer_info::choked) != 0),
				"is_remote_interested",		long((peers[i].flags & peer_info::remote_interested) != 0),
				"is_remote_choked",			long((peers[i].flags & peer_info::remote_choked) != 0),
				"supports_extensions",		long((peers[i].flags & peer_info::supports_extensions)!= 0),
				"is_local_connection",		long((peers[i].flags & peer_info::local_connection) != 0),
				"is_awaiting_handshake",	long((peers[i].flags & peer_info::handshake) != 0),
				"is_connecting",				long((peers[i].flags & peer_info::connecting) != 0),
				"is_queued",					long((peers[i].flags & peer_info::queued) != 0),
				"client",						peers[i].client.c_str(),
				"is_seed",						long(peers[i].seed),
				"ip",								peers[i].ip.address().to_string().c_str(),
				"peer_has",						float(float(pieces_had)*100.0/pieces.size())
					);

		PyTuple_SetItem(ret, i, peer_info);
	};

	return ret;
};

static PyObject *torrent_get_file_info(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	if (!PyArg_ParseTuple(args, "i", &unique_ID))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	std::vector<PyObject *> temp_files;

	PyObject *file_info;

	std::vector<float> progresses;

	torrent_t &t = M_torrents->at(index);
	t.handle.file_progress(progresses);

	torrent_info::file_iterator start =
		t.handle.get_torrent_info().begin_files();
	torrent_info::file_iterator end   =
		t.handle.get_torrent_info().end_files();

	long fileIndex = 0;

	for(torrent_info::file_iterator i = start; i != end; ++i)
	{
		file_entry const &currFile = (*i);

		file_info = Py_BuildValue(
								"{s:s,s:d,s:d,s:f}",
								"path",				currFile.path.string().c_str(),
								"offset", 			double(currFile.offset),
								"size", 				double(currFile.size),
								"progress",			progresses[i - start]*100.0
										);

		fileIndex++;

		temp_files.push_back(file_info);
	};

	PyObject *ret = PyTuple_New(temp_files.size());
	
	for (unsigned long i = 0; i < temp_files.size(); i++)
		PyTuple_SetItem(ret, i, temp_files[i]);

	return ret;
};

static PyObject *torrent_set_filter_out(PyObject *self, PyObject *args)
{
	python_long unique_ID;
	PyObject *filter_out_object;
	if (!PyArg_ParseTuple(args, "iO", &unique_ID, &filter_out_object))
		return NULL;

	long index = get_index_from_unique_ID(unique_ID);
	if (PyErr_Occurred())
		return NULL;

	torrent_t &t = M_torrents->at(index);
	long num_files = t.handle.get_torrent_info().num_files();
	assert(PyList_Size(filter_out_object) ==  num_files);

	filter_out_t filter_out(num_files);

	for (long i = 0; i < num_files; i++)
	{
		filter_out.at(i) =
			PyInt_AsLong(PyList_GetItem(filter_out_object, i));
	};

	t.handle.filter_files(filter_out);

	Py_INCREF(Py_None); return Py_None;
}

/*static PyObject *torrent_get_unique_IDs(PyObject *self, PyObject *args)
{
	PyObject *ret = PyTuple_New(M_torrents.size());
	PyObject *temp;

	for (unsigned long i = 0; i < M_torrents.size(); i++)
	{
		temp = Py_BuildValue("i", M_torrents->at(i).unique_ID)

		PyTuple_SetItem(ret, i, temp);
	};

	return ret;
};*/


static PyObject *torrent_constants(PyObject *self, PyObject *args)
{
	Py_INCREF(M_constants); return M_constants;
}

static PyObject *torrent_start_DHT(PyObject *self, PyObject *args)
{
	const char *DHT_path;
	if (!PyArg_ParseTuple(args, "s", &DHT_path))
		return NULL;

//	printf("Loading DHT state from %s\r\n", DHT_path);

	boost::filesystem::path tempPath(DHT_path, empty_name_check);
	boost::filesystem::ifstream DHT_state_file(tempPath, std::ios_base::binary);
	DHT_state_file.unsetf(std::ios_base::skipws);

	entry DHT_state;
	try{
		DHT_state = bdecode(std::istream_iterator<char>(DHT_state_file),
								  std::istream_iterator<char>());
		M_ses->start_dht(DHT_state);
//		printf("DHT state recovered.\r\n");

//		// Print out the state data from the FILE (not the session!)
//		printf("Number of DHT peers in recovered state: %ld\r\n", count_DHT_peers(DHT_state));

	} catch (std::exception&) {
		printf("No DHT file to resume\r\n");
		M_ses->start_dht();
	}

//	M_ses->add_dht_router(std::make_pair(std::string("router.bittorrent.com"), 
//												DHT_ROUTER_PORT));
//	M_ses->add_dht_router(std::make_pair(std::string("router.utorrent.com"), 
//												DHT_ROUTER_PORT));
////	M_ses->add_dht_router(std::make_pair(std::string("router.bitcomet.com"), 
////												DHT_ROUTER_PORT));

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_stop_DHT(PyObject *self, PyObject *args)
{
	const char *DHT_path;
	if (!PyArg_ParseTuple(args, "s", &DHT_path))
		return NULL;

//	printf("Saving DHT state to %s\r\n", DHT_path);

	boost::filesystem::path tempPath = boost::filesystem::path(DHT_path, empty_name_check);

	try {
		entry DHT_state = M_ses->dht_state();

//		printf("Number of DHT peers in state, saving: %ld\r\n", count_DHT_peers(DHT_state));

		boost::filesystem::ofstream out(tempPath, std::ios_base::binary);
		out.unsetf(std::ios_base::skipws);
		bencode(std::ostream_iterator<char>(out), DHT_state);
	} catch (std::exception& e) {
		printf("An error occured in saving DHT\r\n");
      std::cerr << e.what() << "\n";
	}

	Py_INCREF(Py_None); return Py_None;
}

static PyObject *torrent_get_DHT_info(PyObject *self, PyObject *args)
{
	entry DHT_state = M_ses->dht_state();

	return Py_BuildValue("l", python_long(count_DHT_peers(DHT_state)));

/*
//	DHT_state.print(cout);
	entry *nodes = DHT_state.find_key("nodes");
	if (!nodes)
		return Py_BuildValue("l", -1); // No nodes - we are just starting up...

	entry::list_type &peers = nodes->list();
	entry::list_type::const_iterator i;

	python_long num_peers = 0;

	i = peers.begin();
	while (i != peers.end())
	{
		num_peers++;
		i++;
	}

	return Py_BuildValue("l", num_peers);
*/
}

// Create Torrents: call with something like:
// create_torrent("mytorrent.torrent", "directory or file to make a torrent out of",
//                "tracker1\ntracker2\ntracker3", "no comment", 256, "Deluge");
// That makes a torrent with pieces of 256K, with "Deluge" as the creator string.
//
// The following function contains code by Christophe Dumez and Arvid Norberg
static PyObject *torrent_create_torrent(PyObject *self, PyObject *args)
{
	char *destination, *comment, *creator_str, *input, *trackers;
	python_long piece_size;
	if (!PyArg_ParseTuple(args, "ssssis",
								 &destination, &input, &trackers, &comment, &piece_size, &creator_str))
		return NULL;

	piece_size = piece_size * 1024;

	try
	{
		torrent_info t;
		boost::filesystem::path full_path = complete(boost::filesystem::path(input));
		boost::filesystem::ofstream out(complete(boost::filesystem::path(destination)),
												  std::ios_base::binary);

		internal_add_files(t, full_path.branch_path(), full_path.leaf());
		t.set_piece_size(piece_size);

		storage st(t, full_path.branch_path());

		std::string stdTrackers(trackers);
		unsigned long index = 0, next = stdTrackers.find("\n");
		while (1 == 1)
		{
			t.add_tracker(stdTrackers.substr(index, next-index));
			index = next + 1;
			if (next >= stdTrackers.length())
				break;
			next = stdTrackers.find("\n", index);
			if (next == std::string::npos)
				break;
		}

		int num = t.num_pieces();
		std::vector<char> buf(piece_size);
		for (int i = 0; i < num; ++i)
		{
			st.read(&buf[0], i, 0, t.piece_size(i));
			hasher h(&buf[0], t.piece_size(i));
			t.set_hash(i, h.final());
		}

		t.set_creator(creator_str);
		t.set_comment(comment);

		entry e = t.create_torrent();
		bencode(std::ostream_iterator<char>(out), e);
		return Py_BuildValue("l", 1);
	} catch (std::exception& e)
	{
//		std::cerr << e.what() << "\n";
//		return Py_BuildValue("l", 0);
		PYTORRENTCORE_RAISE_PTR(PyTorrentCoreError, e.what());
	}
}

static PyObject *torrent_apply_IP_filter(PyObject *self, PyObject *args)
{
	PyObject *ranges;
	if (!PyArg_ParseTuple(args, "O", &ranges))
		return NULL;

	long num_ranges = PyList_Size(ranges);

//	printf("Number of ranges: %ld\r\n", num_ranges);
//	Py_INCREF(Py_None); return Py_None;

	// Remove existing filter, if there is one
	if (M_the_filter != NULL)
		delete M_the_filter;

	M_the_filter = new ip_filter();

	address_v4 from, to;
	PyObject *curr;

//	printf("Can I 10.10.10.10? %d\r\n", the_filter->access(address_v4::from_string("10.10.10.10")));

	for (long i = 0; i < num_ranges; i++)
	{
		curr = PyList_GetItem(ranges, i);
//		PyObject_Print(curr, stdout, 0);
		from = address_v4::from_string(PyString_AsString(PyList_GetItem(curr, 0)));
		to   = address_v4::from_string(PyString_AsString(PyList_GetItem(curr, 1)));
//		printf("Filtering: %s - %s\r\n", from.to_string().c_str(), to.to_string().c_str());
		M_the_filter->add_rule(from, to, ip_filter::blocked);
	};

//	printf("Can I 10.10.10.10? %d\r\n", the_filter->access(address_v4::from_string("10.10.10.10")));

	M_ses->set_ip_filter(*M_the_filter);

//	printf("Can I 10.10.10.10? %d\r\n", the_filter->access(address_v4::from_string("10.10.10.10")));

	Py_INCREF(Py_None); return Py_None;
}


//====================
// Python Module data
//====================

static PyMethodDef pytorrent_core_methods[] = {
	{"init",                    torrent_init,   						 METH_VARARGS, 	 "."},
	{"quit",                    torrent_quit,   						 METH_VARARGS, 	 "."},
	{"save_fastresume",		 	 torrent_save_fastresume,			 METH_VARARGS, 	 "."},
	{"set_max_half_open",		 torrent_set_max_half_open,		 METH_VARARGS, 	 "."},
	{"set_download_rate_limit", torrent_set_download_rate_limit, METH_VARARGS,		 "."},
	{"set_upload_rate_limit",   torrent_set_upload_rate_limit,   METH_VARARGS,		 "."},
	{"set_listen_on",           torrent_set_listen_on,           METH_VARARGS,		 "."},
	{"is_listening",				 torrent_is_listening,				 METH_VARARGS,		 "."},
	{"listening_port",			 torrent_listening_port,			 METH_VARARGS,		 "."},
	{"set_max_uploads",         torrent_set_max_uploads,         METH_VARARGS,		 "."},
	{"set_max_connections",     torrent_set_max_connections,     METH_VARARGS,		 "."},
	{"add_torrent",             torrent_add_torrent,             METH_VARARGS,		 "."},
	{"remove_torrent",          torrent_remove_torrent,          METH_VARARGS,		 "."},
	{"get_num_torrents",        torrent_get_num_torrents,        METH_VARARGS,		 "."},
	{"reannounce",              torrent_reannounce,              METH_VARARGS, 	 "."},
	{"pause",                   torrent_pause,                   METH_VARARGS, 	 "."},
	{"resume",                  torrent_resume,                  METH_VARARGS,		 "."},
	{"get_torrent_state",       torrent_get_torrent_state,       METH_VARARGS, 	 "."},
	{"pop_event",               torrent_pop_event,               METH_VARARGS, 	 "."},
	{"get_session_info",  		 torrent_get_session_info, 		 METH_VARARGS,		 "."},
	{"get_peer_info",				 torrent_get_peer_info, 			 METH_VARARGS, 	 "."},
/*	{"get_unique_IDs",			 torrent_get_unique_IDs, 			 METH_VARARGS, 	 "."},*/
	{"get_file_info",				 torrent_get_file_info, 			 METH_VARARGS, 	 "."},
	{"set_filter_out",			 torrent_set_filter_out, 			 METH_VARARGS, 	 "."},
	{"constants",					 torrent_constants, 				    METH_VARARGS,		 "."},
	{"start_DHT",					 torrent_start_DHT, 				    METH_VARARGS,		 "."},
	{"stop_DHT",					 torrent_stop_DHT, 					 METH_VARARGS,		 "."},
	{"get_DHT_info",				 torrent_get_DHT_info, 				 METH_VARARGS,		 "."},
	{"create_torrent",			 torrent_create_torrent, 			 METH_VARARGS,		 "."},
	{"apply_IP_filter",			 torrent_apply_IP_filter, 			 METH_VARARGS,		 "."},
	{NULL}        /* Sentinel */
};


PyMODINIT_FUNC
initpytorrent_core(void)
{
	PyObject *m, *d;

	m = Py_InitModule("pytorrent_core", pytorrent_core_methods);

	PyTorrentCoreError = PyErr_NewException("pytorrent_core.Error", NULL, NULL);

	InvalidEncodingError  = PyErr_NewException("pytorrent_core.InvalidEncodingError",  NULL, NULL);
	FilesystemError       = PyErr_NewException("pytorrent_core.FilesystemError",       NULL, NULL);
	DuplicateTorrentError = PyErr_NewException("pytorrent_core.DuplicateTorrentError", NULL, NULL);
	InvalidTorrentError   = PyErr_NewException("pytorrent_core.InvalidTorrentError",   NULL, NULL);

	d = PyModule_GetDict(m);

	PyDict_SetItemString(d, "PyTorrentCoreError", PyTorrentCoreError);

	PyDict_SetItemString(d, "InvalidEncodingError",  InvalidEncodingError);
	PyDict_SetItemString(d, "FilesystemError",       FilesystemError);
	PyDict_SetItemString(d, "DuplicateTorrentError", DuplicateTorrentError);
	PyDict_SetItemString(d, "InvalidTorrentError",   InvalidTorrentError);
};