import gevent.monkey
gevent.monkey.patch_all()

import bunch
import gevent
import gevent.pool
import realistic
import time
import traceback
import sys

import common
from common import context, config
from common.greenlets import ReaderGreenlet, WriterGreenlet
from common.results import ResultsLogger

# Set up the common context to use our information. Wee.
context.update(bunch.Bunch(
    # Set to False when it's time to exit main loop.
    running = True,

    # The pools our tasks run in.
    greenlet_pools = bunch.Bunch(
        writer=None,
        reader=None,
        ),

    # The greenlet that keeps logs going.
    results_logger = None,
))


def setup():
    config_rt = config.roundtrip

    context.bucket = common.get_new_bucket()
    print "Using bucket: {name}".format(name=context.bucket.name)

    context.greenlet_pools.reader = gevent.pool.Pool(config_rt.pool_sizes.reader, ReaderGreenlet)
    context.greenlet_pools.writer = gevent.pool.Pool(config_rt.pool_sizes.writer, WriterGreenlet)

    context.files_iter = realistic.files_varied(config_rt.create_objects)


def _main():
    def _stop_running():
        """ Since we can't do assignment in a lambda, we have this little stub """
        context.running = False

    grace_period = config.roundtrip.grace_wait

    print "Launching/Scheduling essential services..."
    gevent.spawn_later(config.roundtrip.duration + grace_period, _stop_running)
    context.results_logger = ResultsLogger.spawn()

    print "Launching the pool of writers, and giving them {grace} seconds to get ahead of us!".format(grace=grace_period)
    writers_start_time = time.time()
    while time.time() - writers_start_time < grace_period:
        common.fill_pools(context.greenlet_pools.writer)
        time.sleep(0.1)

    # Main work loop.
    print "Starting main work loop..."
    while context.running:
        common.fill_pools(*context.greenlet_pools.values())
        time.sleep(0.1)

    print "We've hit duration. Time to stop!"
    print "Waiting {grace} seconds for jobs to finish normally.".format(grace=grace_period)
    time.sleep(grace_period)

    print "Killing off any remaining jobs."
    context.greenlet_pools.reader.kill()
    context.greenlet_pools.writer.kill()

    print "Waiting 10 seconds for them to finish dying off and collections to complete!"
    time.sleep(10)

    print "Killing essential services..."
    context.results_logger.kill()

    print "Done!"


def main():
    sys.stdout = sys.stderr # Original steam already saved by common
    common.setup()
    setup()

    # Normal
    try:
        _main()
    except:
        traceback.print_exc()
    common.teardown()