#! /usr/bin/env python

import requests
import time
import hashlib
import bencode

class TorrentTracker:
    torrent = None
    session = None
    peer_id = ""
    port = 0
    user_agent = ""
    interval = 300
    uploaded = 0
    downloaded = 0
    left = 0

    def __init__(self, torrent, port=6882, user_agent="rtorrent/0.8.42/0.12.42"):
        self.torrent = torrent
        self.session = requests.session()
        self.peer_id = hashlib.sha1(str(time.time())).digest()
        self.port = port
        self.user_agent = user_agent

    def getInterval(self):
        return self.interval

    def request(self, event=""):
        params = {"info_hash": self.torrent.getHash().digest(),
                "peer_id": self.peer_id,
                "port": self.port,
                "uploaded": self.uploaded,
                "downloaded": self.downloaded,
                "left": self.left,
                "event": event}
        headers = {"User-Agent": self.user_agent}
        r = self.session.get(self.torrent.getAnnounce(), headers=headers, params=params)
        data = bencode.bdecode(r.content)
        if 'interval' in data:
            self.interval = int(data['interval'])
        return data;

    def start(self, left = 0):
        self.uploaded = 0
        self.downloaded = 0
        self.left = left
        return self.request("started")

    def stop(self):
        return self.request("stopped")

    def complete(self):
        self.left = 0
        return self.request("completed")

    def update(self, uploaded, downloaded = 0, left = 0):
        self.uploaded += uploaded
        self.downloaded += downloaded
        self.left -= left
        return self.request()


    def getUploaded(self):
        return self.uploaded