# Copyright 2009-2013 Eucalyptus Systems, Inc.
#
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from euca2ools.commands.ec2 import EC2Request
from requestbuilder import Arg, Filter, GenericTagFilter
from requestbuilder.exceptions import ArgumentError


class DescribeSnapshots(EC2Request):
    DESCRIPTION = ('Show information about snapshots\n\nBy default, only '
                   'snapshots your account owns and snapshots for which your '
                   'account has explicit restore permissions are shown.')
    ARGS = [Arg('SnapshotId', nargs='*', metavar='SNAPSHOT',
                help='limit results to specific snapshots'),
            Arg('-a', '--all', action='store_true', route_to=None,
                help='describe all snapshots'),
            Arg('-o', '--owner', dest='Owner', metavar='ACCOUNT',
                action='append', default=[],
                help='limit results to snapshots owned by specific accounts'),
            Arg('-r', '--restorable-by', dest='RestorableBy', action='append',
                metavar='ACCOUNT', default=[], help='''limit results to
                snapahots restorable by specific accounts''')]
    FILTERS = [Filter('description', help='snapshot description'),
               Filter('owner-alias', help="snapshot owner's account alias"),
               Filter('owner-id', help="snapshot owner's account ID"),
               Filter('progress', help='snapshot progress, in percentage'),
               Filter('snapshot-id'),
               Filter('start-time', help='snapshot initiation time'),
               Filter('status'),
               Filter('tag-key', help='key of a tag assigned to the snapshot'),
               Filter('tag-value',
                      help='value of a tag assigned to the snapshot'),
               GenericTagFilter('tag:KEY',
                                help='specific tag key/value combination'),
               Filter('volume-id', help='source volume ID'),
               Filter('volume-size', type=int)]
    LIST_TAGS = ['snapshotSet', 'tagSet']

    # noinspection PyExceptionInherit
    def configure(self):
        EC2Request.configure(self)
        if self.args.get('all'):
            if self.args.get('Owner'):
                raise ArgumentError('argument -a/--all: not allowed with '
                                    'argument -o/--owner')
            if self.args.get('RestorableBy'):
                raise ArgumentError('argument -a/--all: not allowed with '
                                    'argument -r/--restorable-by')

    def main(self):
        if not any(self.args.get(item) for item in ('all', 'Owner',
                                                    'RestorableBy')):
            # Default to owned snapshots and those with explicit restore perms
            self.params['Owner'] = ['self']
            owned = self.send()
            del self.params['Owner']
            self.params['RestorableBy'] = ['self']
            restorable = self.send()
            del self.params['RestorableBy']
            owned['snapshotSet'] = (owned.get('snapshotSet', []) +
                                    restorable.get('snapshotSet', []))
            return owned
        else:
            return self.send()

    def print_result(self, result):
        for snapshot in result.get('snapshotSet', []):
            self.print_snapshot(snapshot)
