"""
stats.py: Simple statistics for PyLink IRC Services.
"""
import time
import datetime

from pylinkirc import utils, world, conf
from pylinkirc.log import log
from pylinkirc.coremods import permissions

def timediff(before, now):
    """
    Returns the time difference between "before" and "now" as a formatted string.
    """
    td = datetime.timedelta(seconds=now-before)
    days = td.days

    hours, leftover = divmod(td.seconds, 3600)
    minutes, seconds = divmod(leftover, 60)

    # XXX: I would make this more configurable but it's a lot of work for little gain,
    # since there's no strftime for time differences.
    return '%d day%s, %02d:%02d:%02d' % (td.days, 's' if td.days != 1 else '',
                                         hours, minutes, seconds)

# From RFC 2822: https://tools.ietf.org/html/rfc2822.html#section-3.3
DEFAULT_TIME_FORMAT = "%a, %d %b %Y %H:%M:%S +0000"

@utils.add_cmd
def uptime(irc, source, args):
    """[<network>]

    Returns the uptime for PyLink and the given network's connection (or the current network if not specified)."""
    permissions.checkPermissions(irc, source, ['stats.uptime'])

    try:
        network = args[0]
    except IndexError:
        network = irc.name

    try:
        ircobj = world.networkobjects[network]
    except KeyError:
        irc.error("No such network %r." % network)
        return

    current_time = int(time.time())

    time_format = conf.conf.get('stats', {}).get('time_format', DEFAULT_TIME_FORMAT)

    irc.reply("PyLink uptime: \x02%s\x02 (started on %s)" %
              (timediff(world.start_ts, current_time),
               time.strftime(time_format, time.gmtime(world.start_ts))
              )
             )
    irc.reply("Connected to %s: \x02%s\x02 (connected on %s)" %
              (network,
               timediff(irc.start_ts, current_time),
               time.strftime(time_format, time.gmtime(irc.start_ts))
              )
             )