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# Copyright 2012, 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from optparse import make_option
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from django.core.management.base import CommandError
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from django.db import transaction
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from astakos.im.models import AstakosUser
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from astakos.im.quotas import (
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    qh_sync_users_diffs, list_user_quotas, add_base_quota)
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from astakos.im.functions import get_user_by_uuid
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from astakos.im.management.commands._common import is_uuid, is_email
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from snf_django.management.commands import SynnefoCommand
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from snf_django.management import utils
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from ._common import show_quotas, style_options, check_style, units
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import logging
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logger = logging.getLogger(__name__)
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class Command(SynnefoCommand):
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    help = "List and check the integrity of user quota"
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    option_list = SynnefoCommand.option_list + (
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        make_option('--list',
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                    action='store_true',
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                    dest='list',
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                    default=False,
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                    help="List all quota (default)"),
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        make_option('--unit-style',
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                    default='mb',
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                    help=("Specify display unit for resource values "
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                          "(one of %s); defaults to mb") % style_options),
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        make_option('--verify',
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                    action='store_true',
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                    dest='verify',
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                    default=False,
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                    help="Check if quotaholder is in sync with astakos"),
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        make_option('--sync',
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                    action='store_true',
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                    dest='sync',
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                    default=False,
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                    help="Sync quotaholder"),
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        make_option('--user',
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                    metavar='<uuid or email>',
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                    dest='user',
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                    help="List quota for a specified user"),
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        make_option('--import-base-quota',
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                    dest='import_base_quota',
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                    metavar='<exported-quota.txt>',
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                    help=("Import base quota from file. "
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                          "The file must contain non-empty lines, and each "
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                          "line must contain a single-space-separated list "
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                          "of values: <user> <resource name> <capacity>. "
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                          "Capacity can be followed by a unit with no "
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                          "separating space (e.g 10GB).")
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                    ),
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    )
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    @transaction.commit_on_success
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    def handle(self, *args, **options):
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        sync = options['sync']
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        verify = options['verify']
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        user_ident = options['user']
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        list_ = options['list']
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        import_base_quota = options['import_base_quota']
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        if import_base_quota:
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            if any([sync, verify, list_]):
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                m = "--from-file cannot be combined with other options."
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                raise CommandError(m)
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            self.import_from_file(import_base_quota)
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        else:
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            unit_style = options["unit_style"]
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            check_style(unit_style)
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            self.quotas(sync, verify, user_ident, options["output_format"],
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                        unit_style)
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    def quotas(self, sync, verify, user_ident, output_format, style):
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        list_only = not sync and not verify
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        if user_ident is not None:
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            users = [self.get_user(user_ident)]
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        else:
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            users = AstakosUser.objects.verified()
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        if list_only:
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            qh_quotas, astakos_i = list_user_quotas(users)
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            info = {}
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            for user in users:
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                info[user.uuid] = user.email
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            print_data, labels = show_quotas(qh_quotas, astakos_i, info,
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                                             style=style)
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            utils.pprint_table(self.stdout, print_data, labels,
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                               output_format)
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        elif verify or sync:
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            qh_limits, diff_q = qh_sync_users_diffs(users, sync=sync)
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            if verify:
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                self.print_verify(qh_limits, diff_q)
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            if sync:
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                self.print_sync(diff_q)
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    def get_user(self, user_ident):
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        if is_uuid(user_ident):
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            try:
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                user = AstakosUser.objects.get(uuid=user_ident)
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            except AstakosUser.DoesNotExist:
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                raise CommandError('There is no user with uuid: %s' %
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                                   user_ident)
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        elif is_email(user_ident):
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            try:
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                user = AstakosUser.objects.get(username=user_ident)
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            except AstakosUser.DoesNotExist:
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                raise CommandError('There is no user with email: %s' %
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                                   user_ident)
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        else:
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            raise CommandError('Please specify user by uuid or email')
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        if not user.email_verified:
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            raise CommandError('%s is not a verified user.\n' % user.uuid)
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        return user
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    def print_sync(self, diff_quotas):
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        size = len(diff_quotas)
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        if size == 0:
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            self.stdout.write("No sync needed.\n")
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        else:
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            self.stdout.write("Synced %s users:\n" % size)
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            for holder in diff_quotas.keys():
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                user = get_user_by_uuid(holder)
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                self.stdout.write("%s (%s)\n" % (holder, user.username))
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    def print_verify(self,
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                     qh_limits,
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                     diff_quotas):
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            for holder, local in diff_quotas.iteritems():
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                registered = qh_limits.pop(holder, None)
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                user = get_user_by_uuid(holder)
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                if registered is None:
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                    self.stdout.write(
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                        "No quota for %s (%s) in quotaholder.\n" %
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                        (holder, user.username))
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                else:
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                    self.stdout.write("Quota differ for %s (%s):\n" %
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                                      (holder, user.username))
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                    self.stdout.write("Quota according to quotaholder:\n")
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                    self.stdout.write("%s\n" % (registered))
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                    self.stdout.write("Quota according to astakos:\n")
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                    self.stdout.write("%s\n\n" % (local))
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            diffs = len(diff_quotas)
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            if diffs:
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                self.stdout.write("Quota differ for %d users.\n" % (diffs))
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    def import_from_file(self, location):
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        users = set()
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        with open(location) as f:
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            for line in f.readlines():
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                try:
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                    t = line.rstrip('\n').split(' ')
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                    user = t[0]
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                    resource = t[1]
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                    capacity = t[2]
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                    try:
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                        capacity = units.parse(capacity)
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                    except units.ParseError:
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                        m = ("Capacity should be an integer, optionally "
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                             "followed by a unit.")
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                        raise CommandError(m)
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                except(IndexError, TypeError):
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                    self.stdout.write('Invalid line format: %s:\n' % t)
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                    continue
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                else:
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                    try:
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                        user = self.get_user(user)
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                        users.add(user.id)
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                    except CommandError:
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                        self.stdout.write('Not found user: %s\n' % user)
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                        continue
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                    else:
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                        try:
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                            add_base_quota(user, resource, capacity)
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                        except Exception, e:
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                            self.stdout.write('Failed to add quota: %s\n' % e)
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                            continue