from collections import defaultdict
import datetime
from raven import Client

client = None


def per_manager(timesheets):
    per_manager = defaultdict(list)
    # filter timesheets per manager
    for timesheet in [t for t in timesheets if not t.is_done()]:
        manager_id = timesheet.approver
        per_manager[manager_id].append(timesheet)
    return per_manager


def employees(timesheets):
    return dict([(t.employee.id, t.employee) for t in timesheets])


def previous_monday(date=None):
    today = date or datetime.date.today()
    return today + datetime.timedelta(days=-today.weekday(), weeks=-1)


def is_present(what):
    return what and what.strip()


def is_empty(what):
    return not is_present(what)


def sentry_log(msg, extra={}):
    if client:
        try:
            client.captureMessage(msg, extra=extra)
        except:
            client.captureException()


def sentry_exception():
    if client:
        client.captureException()


def sentry(config):
    if config.has_option('sentry', 'dsn'):
        try:
            dsn = config.get('sentry', 'dsn')
            global client
            client = Client(dsn)
        except Exception as e:
            print(str(e))