#! /usr/bin/env python

import os
import copy
import time
import random
import torrenttracker

class TorrentManager:
    torrents = []
    next_torrents = []
    last_time = 0
    max_ratio = 0
    max_rate = 0
    def __init__(self, max_ratio, max_rate):
        self.max_ratio = max_ratio
        self.max_rate = max_rate * 1024

    def appendTorrent(self, torrent):
        self.torrents.append(torrent)

    def removeTorrent(self, torrent):
        self.torrents.remove(torrent)

    def getTorrents(self):
        return self.torrents

    def resetNextTorrents(self):
        self.last_time = int(time.time())
        self.next_torrents = copy.copy(self.torrents)

    def getNextTorrent(self):
        if not any(self.next_torrents):
            self.resetNextTorrents()
        minTorrent = self.next_torrents[0]
        for torrent in self.next_torrents:
            if (torrent.getTracker().getInterval()
                    < minTorrent.getTracker().getInterval()):
                minTorrent = torrent
        return minTorrent

    def getNextTime(self):
        torrent = self.getNextTorrent()
        t = max(torrent.getTracker().getInterval() - (int(time.time()) - self.last_time), 0)
        return {'time': t, 'torrent': torrent}

    def updateTorrent(self):
        torrent = self.getNextTorrent()
        uploaded = int(self.max_rate / len(self.torrents)) * torrent.getTracker().getInterval()
        uploaded += random.randint(-uploaded / 10, uploaded / 10)
        self.next_torrents.remove(torrent)
        if torrent.getSize() * self.max_ratio <= torrent.getTracker().getUploaded():
            self.torrents.remove(torrent)
            try:
                os.remove(torrent.getFilepath())
            except:
                print("WARNING: failed to remove torrent", torrent.getFilepath())
        torrent.getTracker().update(uploaded)