"""
Test Swift API
"""
from io import BytesIO
from configobj import ConfigObj
import base64
import contextlib
import logging
import os

from distutils.version import LooseVersion
from teuthology import misc as teuthology
from teuthology import contextutil
from teuthology.config import config as teuth_config
from teuthology.orchestra import run

log = logging.getLogger(__name__)


@contextlib.contextmanager
def download(ctx, config):
    """
    Download the Swift API.
    """
    testdir = teuthology.get_testdir(ctx)
    assert isinstance(config, dict)
    log.info('Downloading swift...')
    for (client, cconf) in config.items():
        ctx.cluster.only(client).run(
            args=[
                'git', 'clone',
                '-b', cconf.get('force-branch', 'ceph-nautilus'),
                teuth_config.ceph_git_base_url + 'swift.git',
                '{tdir}/swift'.format(tdir=testdir),
                ],
            )
    try:
        yield
    finally:
        log.info('Removing swift...')
        testdir = teuthology.get_testdir(ctx)
        for (client, _) in config.items():
            ctx.cluster.only(client).run(
                args=[
                    'rm',
                    '-rf',
                    '{tdir}/swift'.format(tdir=testdir),
                    ],
                )

def _config_user(testswift_conf, account, user, suffix):
    """
    Configure a swift user

    :param account: Swift account
    :param user: User name
    :param suffix: user name and email suffixes.
    """
    testswift_conf['func_test'].setdefault('account{s}'.format(s=suffix), account)
    testswift_conf['func_test'].setdefault('username{s}'.format(s=suffix), user)
    testswift_conf['func_test'].setdefault('email{s}'.format(s=suffix), '{account}+test@test.test'.format(account=account))
    testswift_conf['func_test'].setdefault('display_name{s}'.format(s=suffix), 'Mr. {account} {user}'.format(account=account, user=user))
    testswift_conf['func_test'].setdefault('password{s}'.format(s=suffix), base64.b64encode(os.urandom(40)).decode('ascii'))

@contextlib.contextmanager
def create_users(ctx, config):
    """
    Create rgw users to interact with the swift interface.
    """
    assert isinstance(config, dict)
    log.info('Creating rgw users...')
    testdir = teuthology.get_testdir(ctx)
    users = {'': 'foo', '2': 'bar'}
    for client, testswift_conf in config.items():
        cluster_name, daemon_type, client_id = teuthology.split_role(client)
        for suffix, user in users.items():
            _config_user(testswift_conf, '{user}.{client}'.format(user=user, client=client), user, suffix)
            ctx.cluster.only(client).run(
                args=[
                    'adjust-ulimits',
                    'ceph-coverage',
                    '{tdir}/archive/coverage'.format(tdir=testdir),
                    'radosgw-admin',
                    '-n', client,
                    '--cluster', cluster_name,
                    'user', 'create',
                    '--subuser', '{account}:{user}'.format(account=testswift_conf['func_test']['account{s}'.format(s=suffix)],user=user),
                    '--display-name', testswift_conf['func_test']['display_name{s}'.format(s=suffix)],
                    '--secret', testswift_conf['func_test']['password{s}'.format(s=suffix)],
                    '--email', testswift_conf['func_test']['email{s}'.format(s=suffix)],
                    '--key-type', 'swift',
                    '--access', 'full',
                ],
            )
    try:
        yield
    finally:
        for client in config.keys():
            for user in users.values():
                uid = '{user}.{client}'.format(user=user, client=client)
                cluster_name, daemon_type, client_id = teuthology.split_role(client)
                ctx.cluster.only(client).run(
                    args=[
                        'adjust-ulimits',
                        'ceph-coverage',
                        '{tdir}/archive/coverage'.format(tdir=testdir),
                        'radosgw-admin',
                        '-n', client,
                        '--cluster', cluster_name,
                        'user', 'rm',
                        '--uid', uid,
                        '--purge-data',
                        ],
                    )

@contextlib.contextmanager
def configure(ctx, config):
    """
    Configure rgw and Swift
    """
    assert isinstance(config, dict)
    log.info('Configuring testswift...')
    testdir = teuthology.get_testdir(ctx)
    for client, testswift_conf in config.items():
        (remote,) = ctx.cluster.only(client).remotes.keys()
        remote.run(
            args=[
                'cd',
                '{tdir}/swift'.format(tdir=testdir),
                run.Raw('&&'),
                './bootstrap',
                ],
            )
        conf_fp = BytesIO()
        testswift_conf.write(conf_fp)
        teuthology.write_file(
            remote=remote,
            path='{tdir}/archive/testswift.{client}.conf'.format(tdir=testdir, client=client),
            data=conf_fp.getvalue(),
            )
    yield


@contextlib.contextmanager
def run_tests(ctx, config):
    """
    Run an individual Swift test.
    """
    assert isinstance(config, dict)
    testdir = teuthology.get_testdir(ctx)
    for client, client_config in config.items():
        args = [
                'SWIFT_TEST_CONFIG_FILE={tdir}/archive/testswift.{client}.conf'.format(tdir=testdir, client=client),
                '{tdir}/swift/virtualenv/bin/nosetests'.format(tdir=testdir),
                '-w',
                '{tdir}/swift/test/functional'.format(tdir=testdir),
                '-v',
                '-a', '!fails_on_rgw',
                ]
        if client_config is not None and 'extra_args' in client_config:
            args.extend(client_config['extra_args'])

        ctx.cluster.only(client).run(
            args=args,
            )
    yield

@contextlib.contextmanager
def task(ctx, config):
    """
    Run the testswift suite against rgw.

    To run all tests on all clients::

        tasks:
        - ceph:
        - rgw:
        - testswift:

    To restrict testing to particular clients::

        tasks:
        - ceph:
        - rgw: [client.0]
        - testswift: [client.0]

    To run against a server on client.1::

        tasks:
        - ceph:
        - rgw: [client.1]
        - testswift:
            client.0:
              rgw_server: client.1

    To pass extra arguments to nose (e.g. to run a certain test)::

        tasks:
        - ceph:
        - rgw: [client.0]
        - testswift:
            client.0:
              extra_args: ['test.functional.tests:TestFileUTF8', '-m', 'testCopy']
            client.1:
              extra_args: ['--exclude', 'TestFile']
    """
    assert hasattr(ctx, 'rgw'), 'swift must run after the rgw task'
    assert config is None or isinstance(config, list) \
        or isinstance(config, dict), \
        "task testswift only supports a list or dictionary for configuration"
    all_clients = ['client.{id}'.format(id=id_)
                   for id_ in teuthology.all_roles_of_type(ctx.cluster, 'client')]
    if config is None:
        config = all_clients
    if isinstance(config, list):
        config = dict.fromkeys(config)

    testswift_conf = {}
    clients = []
    for client, client_config in config.items():
        # http://tracker.ceph.com/issues/40304 can't bootstrap on rhel 7.6+
        (remote,) = ctx.cluster.only(client).remotes.keys()
        if remote.os.name == 'rhel' and LooseVersion(remote.os.version) >= LooseVersion('7.6'):
            log.warning('Swift tests cannot run on rhel 7.6+, skipping client {}'.format(client))
            continue

        clients.append(client)

        server = client_config.get('rgw_server', client)
        endpoint = ctx.rgw.role_endpoints.get(server)
        assert endpoint, 'swift: no rgw endpoint for {}'.format(server)

        testswift_conf[client] = ConfigObj(
                indent_type='',
                infile={
                    'func_test':
                        {
                        'auth_host' : endpoint.hostname,
                        'auth_port' : endpoint.port,
                        'auth_ssl' : 'yes' if endpoint.cert else 'no',
                        'auth_prefix' : '/auth/',
                        },
                    }
                )
    # only take config for valid clients
    config = {c: config[c] for c in clients}

    log.info('clients={c}'.format(c=config.keys()))
    with contextutil.nested(
        lambda: download(ctx=ctx, config=config),
        lambda: create_users(ctx=ctx, config=testswift_conf),
        lambda: configure(ctx=ctx, config=testswift_conf),
        lambda: run_tests(ctx=ctx, config=config),
        ):
        pass
    yield