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# Patchwork - automated patch tracking system
# Copyright (C) 2008 Jeremy Kerr <jk@ozlabs.org>
#
# This file is part of the Patchwork package.
#
# Patchwork is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Patchwork is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Patchwork; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


import itertools
import datetime
from django.shortcuts import get_object_or_404
from django.template.loader import render_to_string
from django.contrib.sites.models import Site
from django.conf import settings
from django.core.mail import EmailMessage
from django.db.models import Max
from patchwork.forms import MultiplePatchForm
from patchwork.models import Bundle, Project, BundlePatch, UserProfile, \
        PatchChangeNotification, EmailOptout

def get_patch_ids(d, prefix = 'patch_id'):
    ids = []

    for (k, v) in d.items():
        a = k.split(':')
        if len(a) != 2:
            continue
        if a[0] != prefix:
            continue
        if not v:
            continue
        ids.append(a[1])

    return ids

class Order(object):
    order_map = {
        'date':         'date',
        'name':         'name',
        'state':        'state__ordering',
        'submitter':    'submitter__name',
        'delegate':     'delegate__username',
    }
    default_order = ('date', True)

    def __init__(self, str = None, editable = False):
        self.reversed = False
        self.editable = editable

        if self.editable:
            return

        if str is None or str == '':
            (self.order, self.reversed) = self.default_order
            return

        reversed = False
        if str[0] == '-':
            str = str[1:]
            reversed = True

        if str not in self.order_map.keys():
            (self.order, self.reversed) = self.default_order
            return

        self.order = str
        self.reversed = reversed

    def __str__(self):
        str = self.order
        if self.reversed:
            str = '-' + str
        return str

    def name(self):
        return self.order

    def reversed_name(self):
        if self.reversed:
            return self.order
        else:
            return '-' + self.order

    def query(self):
        q = self.order_map[self.order]
        if self.reversed:
            q = '-' + q
        return q

bundle_actions = ['create', 'add', 'remove']
def set_bundle(user, project, action, data, patches, context):
    # set up the bundle
    bundle = None
    if action == 'create':
        bundle_name = data['bundle_name'].strip()
        if not bundle_name:
            return ['No bundle name was specified']

        bundle = Bundle(owner = user, project = project,
                name = bundle_name)
        bundle.save()
        context.add_message("Bundle %s created" % bundle.name)

    elif action =='add':
        bundle = get_object_or_404(Bundle, id = data['bundle_id'])

    elif action =='remove':
        bundle = get_object_or_404(Bundle, id = data['removed_bundle_id'])

    if not bundle:
        return ['no such bundle']

    for patch in patches:
        if action == 'create' or action == 'add':
            bundlepatch_count = BundlePatch.objects.filter(bundle = bundle,
                        patch = patch).count()
            if bundlepatch_count == 0:
                bundle.append_patch(patch)
                context.add_message("Patch '%s' added to bundle %s" % \
                        (patch.name, bundle.name))
            else:
                context.add_message("Patch '%s' already in bundle %s" % \
                        (patch.name, bundle.name))

        elif action == 'remove':
            try:
                bp = BundlePatch.objects.get(bundle = bundle, patch = patch)
                bp.delete()
                context.add_message("Patch '%s' removed from bundle %s\n" % \
                        (patch.name, bundle.name))
            except Exception:
                pass

    bundle.save()

    return []

def send_notifications():
    date_limit = datetime.datetime.now() - \
                     datetime.timedelta(minutes =
                                settings.NOTIFICATION_DELAY_MINUTES)

    # This gets funky: we want to filter out any notifications that should
    # be grouped with other notifications that aren't ready to go out yet. To
    # do that, we join back onto PatchChangeNotification (PCN -> Patch ->
    # Person -> Patch -> max(PCN.last_modified)), filtering out any maxima
    # that are with the date_limit.
    qs = PatchChangeNotification.objects \
            .annotate(m = Max('patch__submitter__patch__patchchangenotification'
                        '__last_modified')) \
                .filter(m__lt = date_limit)

    groups = itertools.groupby(qs.order_by('patch__submitter'),
                               lambda n: n.patch.submitter)

    errors = []

    for (recipient, notifications) in groups:
        notifications = list(notifications)

        def delete_notifications():
            PatchChangeNotification.objects.filter(
                                pk__in = notifications).delete()

        if EmailOptout.is_optout(recipient.email):
            delete_notifications()
            continue

        context = {
            'site': Site.objects.get_current(),
            'person': recipient,
            'notifications': notifications,
        }
        subject = render_to_string(
                        'patchwork/patch-change-notification-subject.text',
                        context).strip()
        content = render_to_string('patchwork/patch-change-notification.mail',
                                context)

        message = EmailMessage(subject = subject, body = content,
                               from_email = settings.NOTIFICATION_FROM_EMAIL,
                               to = [recipient.email],
                               headers = {'Precedence': 'bulk'})

        try:
            message.send()
        except ex:
            errors.append((recipient, ex))
            continue

        delete_notifications()

    return errors