"""
Run an autotest test on the ceph cluster.
"""
import json
import logging
import os

import six

from teuthology import misc as teuthology
from teuthology.parallel import parallel
from teuthology.orchestra import run

log = logging.getLogger(__name__)

def task(ctx, config):
    """
    Run an autotest test on the ceph cluster.

    Only autotest client tests are supported.

    The config is a mapping from role name to list of tests to run on
    that client.

    For example::

        tasks:
        - ceph:
        - ceph-fuse: [client.0, client.1]
        - autotest:
            client.0: [dbench]
            client.1: [bonnie]

    You can also specify a list of tests to run on all clients::

        tasks:
        - ceph:
        - ceph-fuse:
        - autotest:
            all: [dbench]
    """
    assert isinstance(config, dict)
    config = teuthology.replace_all_with_clients(ctx.cluster, config)
    log.info('Setting up autotest...')
    testdir = teuthology.get_testdir(ctx)
    with parallel() as p:
        for role in config.keys():
            (remote,) = ctx.cluster.only(role).remotes.keys()
            p.spawn(_download, testdir, remote)

    log.info('Making a separate scratch dir for every client...')
    for role in config.keys():
        assert isinstance(role, six.string_types)
        PREFIX = 'client.'
        assert role.startswith(PREFIX)
        id_ = role[len(PREFIX):]
        (remote,) = ctx.cluster.only(role).remotes.keys()
        mnt = os.path.join(testdir, 'mnt.{id}'.format(id=id_))
        scratch = os.path.join(mnt, 'client.{id}'.format(id=id_))
        remote.run(
            args=[
                'sudo',
                'install',
                '-d',
                '-m', '0755',
                '--owner={user}'.format(user='ubuntu'), #TODO
                '--',
                scratch,
                ],
            )

    with parallel() as p:
        for role, tests in config.items():
            (remote,) = ctx.cluster.only(role).remotes.keys()
            p.spawn(_run_tests, testdir, remote, role, tests)

def _download(testdir, remote):
    """
    Download.  Does not explicitly support muliple tasks in a single run.
    """
    remote.run(
        args=[
            # explicitly does not support multiple autotest tasks
            # in a single run; the result archival would conflict
            'mkdir', '{tdir}/archive/autotest'.format(tdir=testdir),
            run.Raw('&&'),
            'mkdir', '{tdir}/autotest'.format(tdir=testdir),
            run.Raw('&&'),
            'wget',
            '-nv',
            '--no-check-certificate',
            'https://github.com/ceph/autotest/tarball/ceph',
            '-O-',
            run.Raw('|'),
            'tar',
            '-C', '{tdir}/autotest'.format(tdir=testdir),
            '-x',
            '-z',
            '-f-',
            '--strip-components=1',
            ],
        )

def _run_tests(testdir, remote, role, tests):
    """
    Spawned to run test on remote site
    """
    assert isinstance(role, six.string_types)
    PREFIX = 'client.'
    assert role.startswith(PREFIX)
    id_ = role[len(PREFIX):]
    mnt = os.path.join(testdir, 'mnt.{id}'.format(id=id_))
    scratch = os.path.join(mnt, 'client.{id}'.format(id=id_))

    assert isinstance(tests, list)
    for idx, testname in enumerate(tests):
        log.info('Running autotest client test #%d: %s...', idx, testname)

        tag = 'client.{id}.num{idx}.{testname}'.format(
            idx=idx,
            testname=testname,
            id=id_,
            )
        control = '{tdir}/control.{tag}'.format(tdir=testdir, tag=tag)
        teuthology.write_file(
            remote=remote,
            path=control,
            data='import json; data=json.loads({data!r}); job.run_test(**data)'.format(
                data=json.dumps(dict(
                        url=testname,
                        dir=scratch,
                        # TODO perhaps tag
                        # results will be in {testdir}/autotest/client/results/dbench
                        # or {testdir}/autotest/client/results/dbench.{tag}
                        )),
                ),
            )
        remote.run(
            args=[
                '{tdir}/autotest/client/bin/autotest'.format(tdir=testdir),
                '--verbose',
                '--harness=simple',
                '--tag={tag}'.format(tag=tag),
                control,
                run.Raw('3>&1'),
                ],
            )

        remote.run(
            args=[
                'rm', '-rf', '--', control,
                ],
            )

        remote.run(
            args=[
                'mv',
                '--',
                '{tdir}/autotest/client/results/{tag}'.format(tdir=testdir, tag=tag),
                '{tdir}/archive/autotest/{tag}'.format(tdir=testdir, tag=tag),
                ],
            )

    remote.run(
        args=[
            'rm', '-rf', '--', '{tdir}/autotest'.format(tdir=testdir),
            ],
        )