#!/usr/bin/python
# this is python2 as openstack dependencies (swiftclient, keystoneclient,
# glanceclient) are not python3.
import argparse
import os.path
import sys

from simplestreams import objectstores
from simplestreams.objectstores import swift
from simplestreams import log
from simplestreams import mirrors
from simplestreams import openstack
from simplestreams.mirrors import glance


def error(msg):
    sys.stderr.write(msg)


def main():
    parser = argparse.ArgumentParser()

    parser.add_argument('--keep', action='store_true', default=False,
                        help='keep items in target up to MAX items '
                             'even after they have fallen out of the source')
    parser.add_argument('--max', type=int, default=None,
                        help='store at most MAX items in the target')

    parser.add_argument('--region', action='append', default=None,
                        dest='regions',
                        help='operate on specified region '
                             '[useable multiple times]')

    parser.add_argument('--mirror', action='append', default=[],
                        dest="mirrors",
                        help='additional mirrors to find referenced files')
    parser.add_argument('--output-dir', metavar="DIR", default=False,
                        help='write image data to storage in dir')
    parser.add_argument('--output-swift', metavar="prefix", default=False,
                        help='write image data to swift under prefix')

    parser.add_argument('--name-prefix', metavar="prefix", default=None,
                        help='prefix for each published image name')
    parser.add_argument('--cloud-name', metavar="name", default=None,
                        required=True, help='unique name for this cloud')
    parser.add_argument('--content-id', metavar="name", default=None,
                        required=True,
                        help='content-id to use for published data.'
                             '  may contain "%%(region)s"')

    parser.add_argument('--verbose', '-v', action='count', default=0)
    parser.add_argument('--log-file', default=sys.stderr,
                        type=argparse.FileType('w'))

    parser.add_argument('source_mirror')
    parser.add_argument('path', nargs='?', default="streams/v1/index.sjson")
    args = parser.parse_args()

    mirror_config = {'max_items': args.max, 'keep_items': args.keep,
                     'cloud_name': args.cloud_name}

    smirror = mirrors.UrlMirrorReader(args.source_mirror, mirrors=args.mirrors)
    if args.output_dir and args.output_swift:
        error("--output-dir and --output-swift are mutually exclusive\n")
        sys.exit(1)

    level = (log.ERROR, log.INFO, log.DEBUG)[min(args.verbose, 2)]
    log.basicConfig(stream=args.log_file, level=level)

    regions = args.regions
    if regions is None:
        regions = openstack.get_regions(services=['image'])

    for region in regions:
        if args.output_dir:
            outd = os.path.join(args.output_dir, region)
            tstore = objectstores.FileStore(outd)
        elif args.output_swift:
            tstore = swift.SwiftObjectStore(args.output_swift, region=region)
        else:
            sys.stderr.write("not writing data anywhere\n")
            tstore = None

        mirror_config['content_id'] = args.content_id % {'region': region}

        tmirror = glance.GlanceMirror(config=mirror_config,
                                      objectstore=tstore, region=region,
                                      name_prefix=args.name_prefix)
        tmirror.sync(smirror.reader, args.path)


if __name__ == '__main__':
    main()

# vi: ts=4 expandtab syntax=python
