#!/usr/bin/python
"""
Jutda Helpdesk - A Django powered ticket tracker for small enterprise.

(c) Copyright 2008 Jutda. All Rights Reserved. See LICENSE for details.

scripts/create_escalation_exclusion.py - Easy way to routinely add particular
                                         days to the list of days on which no
                                         escalation should take place.
"""

from datetime import datetime, timedelta, date
import getopt
from optparse import make_option
import sys

from django.core.management.base import BaseCommand, CommandError
from django.db.models import Q

from helpdesk.models import EscalationExclusion, Queue


class Command(BaseCommand):
    def __init__(self):
        BaseCommand.__init__(self)

        self.option_list += (
            make_option(
                '--days', '-d',
                help='Days of week (monday, tuesday, etc)'),
            make_option(
                '--occurrences', '-o',
                type='int',
                default=1,
                help='Occurrences: How many weeks ahead to exclude this day'),
            make_option(
                '--queues', '-q',
                help='Queues to include (default: all). Use queue slugs'),
            make_option(
                '--escalate-verbosely', '-x',
                action='store_true',
                default=False,
                help='Display a list of dates excluded'),
            )

    def handle(self, *args, **options):
        days = options['days']
        occurrences = options['occurrences']
        verbose = False
        queue_slugs = options['queues']
        queues = []

        if options['escalate-verbosely']:
            verbose = True

        # this should already be handled by optparse
        if not occurrences: occurrences = 1
        if not (days and occurrences):
            raise CommandError('One or more occurrences must be specified.')

        if queue_slugs is not None:
            queue_set = queue_slugs.split(',')
            for queue in queue_set:
                try:
                    q = Queue.objects.get(slug__exact=queue)
                except Queue.DoesNotExist:
                    raise CommandError("Queue %s does not exist." % queue)
                queues.append(q)

        create_exclusions(days=days, occurrences=occurrences, verbose=verbose, queues=queues)


day_names = {
    'monday': 0,
    'tuesday': 1,
    'wednesday': 2,
    'thursday': 3,
    'friday': 4,
    'saturday': 5,
    'sunday': 6,
}


def create_exclusions(days, occurrences, verbose, queues):
    days = days.split(',')
    for day in days:
        day_name = day
        day = day_names[day]
        workdate = date.today()
        i = 0
        while i < occurrences:
            if day == workdate.weekday():
                if EscalationExclusion.objects.filter(date=workdate).count() == 0:
                    esc = EscalationExclusion(name='Auto Exclusion for %s' % day_name, date=workdate)
                    esc.save()

                    if verbose:
                        print "Created exclusion for %s %s" % (day_name, workdate)

                    for q in queues:
                        esc.queues.add(q)
                        if verbose:
                            print "  - for queue %s" % q

                i += 1
            workdate += timedelta(days=1)


def usage():
    print "Options:"
    print " --days, -d: Days of week (monday, tuesday, etc)"
    print " --occurrences, -o: Occurrences: How many weeks ahead to exclude this day"
    print " --queues, -q: Queues to include (default: all). Use queue slugs"
    print " --verbose, -v: Display a list of dates excluded"


if __name__ == '__main__':
    # This script can be run from the command-line or via Django's manage.py.
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'd:o:q:v', ['days=', 'occurrences=', 'verbose', 'queues='])
    except getopt.GetoptError:
        usage()
        sys.exit(2)

    days = None
    occurrences = None
    verbose = False
    queue_slugs = None
    queues = []

    for o, a in opts:
        if o in ('-x', '--escalate-verbosely'):
            verbose = True
        if o in ('-d', '--days'):
            days = a
        if o in ('-q', '--queues'):
            queue_slugs = a
        if o in ('-o', '--occurrences'):
            occurrences = int(a)

    if not occurrences: occurrences = 1
    if not (days and occurrences):
        usage()
        sys.exit(2)

    if queue_slugs is not None:
        queue_set = queue_slugs.split(',')
        for queue in queue_set:
            try:
                q = Queue.objects.get(slug__exact=queue)
            except Queue.DoesNotExist:
                print "Queue %s does not exist." % queue
                sys.exit(2)
            queues.append(q)

    create_exclusions(days=days, occurrences=occurrences, verbose=verbose, queues=queues)