"""
src/network/invthread.py
========================
"""
import Queue
import random
from time import time

import addresses
import protocol
import state
from network.connectionpool import BMConnectionPool
from network.dandelion import Dandelion
from queues import invQueue
from threads import StoppableThread


def handleExpiredDandelion(expired):
    """For expired dandelion objects, mark all remotes as not having
       the object"""
    if not expired:
        return
    for i in BMConnectionPool().connections():
        if not i.fullyEstablished:
            continue
        for x in expired:
            streamNumber, hashid, _ = x
            try:
                del i.objectsNewToMe[hashid]
            except KeyError:
                if streamNumber in i.streams:
                    with i.objectsNewToThemLock:
                        i.objectsNewToThem[hashid] = time()


class InvThread(StoppableThread):
    """A thread to send inv annoucements."""

    name = "InvBroadcaster"

    @staticmethod
    def handleLocallyGenerated(stream, hashId):
        """Locally generated inventory items require special handling"""
        Dandelion().addHash(hashId, stream=stream)
        for connection in BMConnectionPool().connections():
            if state.dandelion and connection != Dandelion().objectChildStem(hashId):
                continue
            connection.objectsNewToThem[hashId] = time()

    def run(self):      # pylint: disable=too-many-branches
        while not state.shutdown:       # pylint: disable=too-many-nested-blocks
            chunk = []
            while True:
                # Dandelion fluff trigger by expiration
                handleExpiredDandelion(Dandelion().expire())
                try:
                    data = invQueue.get(False)
                    chunk.append((data[0], data[1]))
                    # locally generated
                    if len(data) == 2 or data[2] is None:
                        self.handleLocallyGenerated(data[0], data[1])
                except Queue.Empty:
                    break

            if chunk:
                for connection in BMConnectionPool().connections():
                    fluffs = []
                    stems = []
                    for inv in chunk:
                        if inv[0] not in connection.streams:
                            continue
                        try:
                            with connection.objectsNewToThemLock:
                                del connection.objectsNewToThem[inv[1]]
                        except KeyError:
                            continue
                        try:
                            if connection == Dandelion().objectChildStem(inv[1]):
                                # Fluff trigger by RNG
                                # auto-ignore if config set to 0, i.e. dandelion is off
                                if random.randint(1, 100) >= state.dandelion:
                                    fluffs.append(inv[1])
                                # send a dinv only if the stem node supports dandelion
                                elif connection.services & protocol.NODE_DANDELION > 0:
                                    stems.append(inv[1])
                                else:
                                    fluffs.append(inv[1])
                        except KeyError:
                            fluffs.append(inv[1])

                    if fluffs:
                        random.shuffle(fluffs)
                        connection.append_write_buf(protocol.CreatePacket(
                            'inv',
                            addresses.encodeVarint(len(fluffs)) + ''.join(fluffs)))
                    if stems:
                        random.shuffle(stems)
                        connection.append_write_buf(protocol.CreatePacket(
                            'dinv',
                            addresses.encodeVarint(len(stems)) + ''.join(stems)))

            invQueue.iterate()
            for i in range(len(chunk)):
                invQueue.task_done()

            if Dandelion().refresh < time():
                Dandelion().reRandomiseStems()

            self.stop.wait(1)