"""
:synopsis: Parent crawler module, which supervises all crawlers.

Contains functions for initializing all subsidiary, threaded crawlers.
"""

import logging
import logging.handlers
import os
import Queue
import time
from threading import Event

from bitshift.crawler import crawler, indexer
from bitshift.parser import start_parse_servers

__all__ = ["crawl"]

def crawl():
    """
    Initialize all crawlers (and indexers).

    Start the:
    1. GitHub crawler, :class:`crawler.GitHubCrawler`.
    2. Bitbucket crawler, :class:`crawler.BitbucketCrawler`.
    3. Git indexer, :class:`bitshift.crawler.indexer.GitIndexer`.
    """

    _configure_logging()

    MAX_URL_QUEUE_SIZE = 5e3

    repo_clone_queue = Queue.Queue(maxsize=MAX_URL_QUEUE_SIZE)
    run_event = Event()
    run_event.set()
    threads = [crawler.GitHubCrawler(repo_clone_queue, run_event),
               crawler.BitbucketCrawler(repo_clone_queue, run_event),
               indexer.GitIndexer(repo_clone_queue, run_event)]

    parse_servers = start_parse_servers()
    time.sleep(5)
    for thread in threads:
        thread.start()

    try:
        while 1:
            time.sleep(0.1)
    except KeyboardInterrupt:
        run_event.clear()
        for thread in threads:
            thread.join()
        for server in parse_servers:
            server.kill()

def _configure_logging():
    # This isn't ideal, since it means the bitshift python package must be kept
    # inside the app, but it works for now:
    root = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", ".."))
    log_dir = os.path.join(root, "logs")

    if not os.path.exists(log_dir):
        os.mkdir(log_dir)

    logging.getLogger("requests").setLevel(logging.WARNING)
    logging.getLogger("urllib3").setLevel(logging.WARNING)

    formatter = logging.Formatter(
            fmt=("%(asctime)s %(levelname)s %(name)s:%(funcName)s"
            " %(message)s"), datefmt="%y-%m-%d %H:%M:%S")

    handler = logging.handlers.TimedRotatingFileHandler(
            "%s/%s" % (log_dir, "app.log"), when="H", interval=1,
            backupCount=20)
    handler.setFormatter(formatter)

    root_logger = logging.getLogger()
    root_logger.addHandler(handler)
    root_logger.setLevel(logging.NOTSET)

if __name__ == "__main__":
    crawl()
