from cStringIO import StringIO
import base64
import contextlib
import logging
import os
import random
import string
import yaml

from teuthology import misc as teuthology
from teuthology import contextutil
from ..orchestra import run
from ..orchestra.connection import split_user

log = logging.getLogger(__name__)


@contextlib.contextmanager
def download(ctx, config):
    assert isinstance(config, dict)
    log.info('Downloading s3-tests...')
    testdir = teuthology.get_testdir(ctx)
    for (client, cconf) in config.items():
        branch = cconf.get('force-branch', None)
        if not branch:
            branch = cconf.get('branch', 'master')
        sha1 = cconf.get('sha1')
        ctx.cluster.only(client).run(
            args=[
                'git', 'clone',
                '-b', branch,
                config.ceph_git_base_url + 's3-tests.git',
                '{tdir}/s3-tests'.format(tdir=testdir),
                ],
            )
        if sha1 is not None:
            ctx.cluster.only(client).run(
                args=[
                    'cd', '{tdir}/s3-tests'.format(tdir=testdir),
                    run.Raw('&&'),
                    'git', 'reset', '--hard', sha1,
                    ],
                )
    try:
        yield
    finally:
        log.info('Removing s3-tests...')
        testdir = teuthology.get_testdir(ctx)
        for client in config:
            ctx.cluster.only(client).run(
                args=[
                    'rm',
                    '-rf',
                    '{tdir}/s3-tests'.format(tdir=testdir),
                    ],
                )


def _config_user(s3tests_conf, section, user):
    s3tests_conf[section].setdefault('user_id', user)
    s3tests_conf[section].setdefault('email', '{user}+test@test.test'.format(user=user))
    s3tests_conf[section].setdefault('display_name', 'Mr. {user}'.format(user=user))
    s3tests_conf[section].setdefault('access_key', ''.join(random.choice(string.uppercase) for i in xrange(20)))
    s3tests_conf[section].setdefault('secret_key', base64.b64encode(os.urandom(40)))

@contextlib.contextmanager
def create_users(ctx, config):
    assert isinstance(config, dict)
    log.info('Creating rgw users...')
    testdir = teuthology.get_testdir(ctx)
    users = {'s3': 'foo'}
    cached_client_user_names = dict()
    for client in config['clients']:
        cached_client_user_names[client] = dict()
        s3tests_conf = config['s3tests_conf'][client]
        s3tests_conf.setdefault('readwrite', {})
        s3tests_conf['readwrite'].setdefault('bucket', 'rwtest-' + client + '-{random}-')
        s3tests_conf['readwrite'].setdefault('readers', 10)
        s3tests_conf['readwrite'].setdefault('writers', 3)
        s3tests_conf['readwrite'].setdefault('duration', 300)
        s3tests_conf['readwrite'].setdefault('files', {})
        rwconf = s3tests_conf['readwrite']
        rwconf['files'].setdefault('num', 10)
        rwconf['files'].setdefault('size', 2000)
        rwconf['files'].setdefault('stddev', 500)
        for section, user in users.iteritems():
            _config_user(s3tests_conf, section, '{user}.{client}'.format(user=user, client=client))
            log.debug('creating user {user} on {client}'.format(user=s3tests_conf[section]['user_id'],
                                                                client=client))

            # stash the 'delete_user' flag along with user name for easier cleanup
            delete_this_user = True
            if 'delete_user' in s3tests_conf['s3']:
                delete_this_user = s3tests_conf['s3']['delete_user']
                log.debug('delete_user set to {flag} for {client}'.format(flag=delete_this_user,client=client))
            cached_client_user_names[client][section+user] = (s3tests_conf[section]['user_id'], delete_this_user)

            # skip actual user creation if the create_user flag is set to false for this client
            if 'create_user' in s3tests_conf['s3'] and s3tests_conf['s3']['create_user'] == False:
                log.debug('create_user set to False, skipping user creation for {client}'.format(client=client))
                continue
            else:
                ctx.cluster.only(client).run(
                    args=[
                        'adjust-ulimits',
                        'ceph-coverage',
                        '{tdir}/archive/coverage'.format(tdir=testdir),
                        'radosgw-admin',
                        '-n', client,
                        'user', 'create',
                        '--uid', s3tests_conf[section]['user_id'],
                        '--display-name', s3tests_conf[section]['display_name'],
                        '--access-key', s3tests_conf[section]['access_key'],
                        '--secret', s3tests_conf[section]['secret_key'],
                        '--email', s3tests_conf[section]['email'],
                    ],
                )
    try:
        yield
    finally:
        for client in config['clients']:
            for section, user in users.iteritems():
                #uid = '{user}.{client}'.format(user=user, client=client)
                real_uid, delete_this_user  = cached_client_user_names[client][section+user]
                if delete_this_user:
                    ctx.cluster.only(client).run(
                        args=[
                            'adjust-ulimits',
                            'ceph-coverage',
                            '{tdir}/archive/coverage'.format(tdir=testdir),
                            'radosgw-admin',
                            '-n', client,
                            'user', 'rm',
                            '--uid', real_uid,
                            '--purge-data',
                            ],
                        )
                else:
                    log.debug('skipping delete for user {uid} on {client}'.format(uid=real_uid,client=client))

@contextlib.contextmanager
def configure(ctx, config):
    assert isinstance(config, dict)
    log.info('Configuring s3-readwrite-tests...')
    for client, properties in config['clients'].iteritems():
        s3tests_conf = config['s3tests_conf'][client]
        if properties is not None and 'rgw_server' in properties:
            host = None
            for target, roles in zip(ctx.config['targets'].iterkeys(), ctx.config['roles']):
                log.info('roles: ' + str(roles))
                log.info('target: ' + str(target))
                if properties['rgw_server'] in roles:
                    _, host = split_user(target)
            assert host is not None, "Invalid client specified as the rgw_server"
            s3tests_conf['s3']['host'] = host
        else:
            s3tests_conf['s3']['host'] = 'localhost'

        def_conf = s3tests_conf['DEFAULT']
        s3tests_conf['s3'].setdefault('port', def_conf['port'])
        s3tests_conf['s3'].setdefault('is_secure', def_conf['is_secure'])

        (remote,) = ctx.cluster.only(client).remotes.keys()
        remote.run(
            args=[
                'cd',
                '{tdir}/s3-tests'.format(tdir=teuthology.get_testdir(ctx)),
                run.Raw('&&'),
                './bootstrap',
                ],
            )
        conf_fp = StringIO()
        conf = dict(
                        s3=s3tests_conf['s3'],
                        readwrite=s3tests_conf['readwrite'],
                    )
        yaml.safe_dump(conf, conf_fp, default_flow_style=False)
        teuthology.write_file(
            remote=remote,
            path='{tdir}/archive/s3readwrite.{client}.config.yaml'.format(tdir=teuthology.get_testdir(ctx), client=client),
            data=conf_fp.getvalue(),
            )
    yield


@contextlib.contextmanager
def run_tests(ctx, config):
    assert isinstance(config, dict)
    testdir = teuthology.get_testdir(ctx)
    for client, client_config in config.iteritems():
        (remote,) = ctx.cluster.only(client).remotes.keys()
        conf = teuthology.get_file(remote, '{tdir}/archive/s3readwrite.{client}.config.yaml'.format(tdir=testdir, client=client))
        args = [
                '{tdir}/s3-tests/virtualenv/bin/s3tests-test-readwrite'.format(tdir=testdir),
                ]
        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,
            stdin=conf,
            )
    yield


@contextlib.contextmanager
def task(ctx, config):
    """
    Run the s3tests-test-readwrite suite against rgw.

    To run all tests on all clients::

        tasks:
        - ceph:
        - rgw:
        - s3readwrite:

    To restrict testing to particular clients::

        tasks:
        - ceph:
        - rgw: [client.0]
        - s3readwrite: [client.0]

    To run against a server on client.1::

        tasks:
        - ceph:
        - rgw: [client.1]
        - s3readwrite:
            client.0:
              rgw_server: client.1

    To pass extra test arguments

        tasks:
        - ceph:
        - rgw: [client.0]
        - s3readwrite:
            client.0:
              readwrite:
                bucket: mybucket
                readers: 10
                writers: 3
                duration: 600
                files:
                  num: 10
                  size: 2000
                  stddev: 500
            client.1:
              ...

    To override s3 configuration

        tasks:
        - ceph:
        - rgw: [client.0]
        - s3readwrite:
            client.0:
              s3:
                user_id: myuserid
                display_name: myname
                email: my@email
                access_key: myaccesskey
                secret_key: mysecretkey

    """
    assert config is None or isinstance(config, list) \
        or isinstance(config, dict), \
        "task s3tests 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)
    clients = config.keys()

    overrides = ctx.config.get('overrides', {})
    # merge each client section, not the top level.
    for client in config.iterkeys():
        if not config[client]:
            config[client] = {}
        teuthology.deep_merge(config[client], overrides.get('s3readwrite', {}))

    log.debug('in s3readwrite, config is %s', config)

    s3tests_conf = {}
    for client in clients:
        if config[client] is None:
            config[client] = {}
        config[client].setdefault('s3', {})
        config[client].setdefault('readwrite', {})

        s3tests_conf[client] = ({
                'DEFAULT':
                    {
                    'port'      : 7280,
                    'is_secure' : False,
                    },
                'readwrite' : config[client]['readwrite'],
                's3'  : config[client]['s3'],
                })

    with contextutil.nested(
        lambda: download(ctx=ctx, config=config),
        lambda: create_users(ctx=ctx, config=dict(
                clients=clients,
                s3tests_conf=s3tests_conf,
                )),
        lambda: configure(ctx=ctx, config=dict(
                clients=config,
                s3tests_conf=s3tests_conf,
                )),
        lambda: run_tests(ctx=ctx, config=config),
        ):
        pass
    yield