from copy import copy
import json
import os
import shutil
import six
import tempfile

try:
    from unittest import mock
except ImportError:
    import mock
try:
    from contextlib import ExitStack
except ImportError:
    from contextlib2 import ExitStack

from cloudinit import helpers
from cloudinit import settings
from cloudinit.sources import DataSourceConfigDrive as ds
from cloudinit.sources.helpers import openstack
from cloudinit import util

from ..helpers import TestCase


PUBKEY = u'ssh-rsa AAAAB3NzaC1....sIkJhq8wdX+4I3A4cYbYP ubuntu@server-460\n'
EC2_META = {
    'ami-id': 'ami-00000001',
    'ami-launch-index': 0,
    'ami-manifest-path': 'FIXME',
    'block-device-mapping': {
        'ami': 'sda1',
        'ephemeral0': 'sda2',
        'root': '/dev/sda1',
        'swap': 'sda3'},
    'hostname': 'sm-foo-test.novalocal',
    'instance-action': 'none',
    'instance-id': 'i-00000001',
    'instance-type': 'm1.tiny',
    'local-hostname': 'sm-foo-test.novalocal',
    'local-ipv4': None,
    'placement': {'availability-zone': 'nova'},
    'public-hostname': 'sm-foo-test.novalocal',
    'public-ipv4': '',
    'public-keys': {'0': {'openssh-key': PUBKEY}},
    'reservation-id': 'r-iru5qm4m',
    'security-groups': ['default']
}
USER_DATA = b'#!/bin/sh\necho This is user data\n'
OSTACK_META = {
    'availability_zone': 'nova',
    'files': [{'content_path': '/content/0000', 'path': '/etc/foo.cfg'},
              {'content_path': '/content/0001', 'path': '/etc/bar/bar.cfg'}],
    'hostname': 'sm-foo-test.novalocal',
    'meta': {'dsmode': 'local', 'my-meta': 'my-value'},
    'name': 'sm-foo-test',
    'public_keys': {'mykey': PUBKEY},
    'uuid': 'b0fa911b-69d4-4476-bbe2-1c92bff6535c'}

CONTENT_0 = b'This is contents of /etc/foo.cfg\n'
CONTENT_1 = b'# this is /etc/bar/bar.cfg\n'
NETWORK_DATA = {
    'services': [
        {'type': 'dns', 'address': '199.204.44.24'},
        {'type': 'dns', 'address': '199.204.47.54'}
    ],
    'links': [
        {'vif_id': '2ecc7709-b3f7-4448-9580-e1ec32d75bbd',
         'ethernet_mac_address': 'fa:16:3e:69:b0:58',
         'type': 'ovs', 'mtu': None, 'id': 'tap2ecc7709-b3'},
        {'vif_id': '2f88d109-5b57-40e6-af32-2472df09dc33',
         'ethernet_mac_address': 'fa:16:3e:d4:57:ad',
         'type': 'ovs', 'mtu': None, 'id': 'tap2f88d109-5b'},
        {'vif_id': '1a5382f8-04c5-4d75-ab98-d666c1ef52cc',
         'ethernet_mac_address': 'fa:16:3e:05:30:fe',
         'type': 'ovs', 'mtu': None, 'id': 'tap1a5382f8-04'}
    ],
    'networks': [
        {'link': 'tap2ecc7709-b3', 'type': 'ipv4_dhcp',
         'network_id': '6d6357ac-0f70-4afa-8bd7-c274cc4ea235',
         'id': 'network0'},
        {'link': 'tap2f88d109-5b', 'type': 'ipv4_dhcp',
         'network_id': 'd227a9b3-6960-4d94-8976-ee5788b44f54',
         'id': 'network1'},
        {'link': 'tap1a5382f8-04', 'type': 'ipv4_dhcp',
         'network_id': 'dab2ba57-cae2-4311-a5ed-010b263891f5',
         'id': 'network2'}
    ]
}

CFG_DRIVE_FILES_V2 = {
    'ec2/2009-04-04/meta-data.json': json.dumps(EC2_META),
    'ec2/2009-04-04/user-data': USER_DATA,
    'ec2/latest/meta-data.json': json.dumps(EC2_META),
    'ec2/latest/user-data': USER_DATA,
    'openstack/2012-08-10/meta_data.json': json.dumps(OSTACK_META),
    'openstack/2012-08-10/user_data': USER_DATA,
    'openstack/content/0000': CONTENT_0,
    'openstack/content/0001': CONTENT_1,
    'openstack/latest/meta_data.json': json.dumps(OSTACK_META),
    'openstack/latest/user_data': USER_DATA,
    'openstack/latest/network_data.json': json.dumps(NETWORK_DATA),
    'openstack/2015-10-15/meta_data.json': json.dumps(OSTACK_META),
    'openstack/2015-10-15/user_data': USER_DATA,
    'openstack/2015-10-15/network_data.json': json.dumps(NETWORK_DATA)}


class TestConfigDriveDataSource(TestCase):

    def setUp(self):
        super(TestConfigDriveDataSource, self).setUp()
        self.tmp = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.tmp)

    def test_ec2_metadata(self):
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        found = ds.read_config_drive(self.tmp)
        self.assertTrue('ec2-metadata' in found)
        ec2_md = found['ec2-metadata']
        self.assertEqual(EC2_META, ec2_md)

    def test_dev_os_remap(self):
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        cfg_ds = ds.DataSourceConfigDrive(settings.CFG_BUILTIN,
                                          None,
                                          helpers.Paths({}))
        found = ds.read_config_drive(self.tmp)
        cfg_ds.metadata = found['metadata']
        name_tests = {
            'ami': '/dev/vda1',
            'root': '/dev/vda1',
            'ephemeral0': '/dev/vda2',
            'swap': '/dev/vda3',
        }
        for name, dev_name in name_tests.items():
            with ExitStack() as mocks:
                provided_name = dev_name[len('/dev/'):]
                provided_name = "s" + provided_name[1:]
                find_mock = mocks.enter_context(
                    mock.patch.object(util, 'find_devs_with',
                                      return_value=[provided_name]))
                # We want os.path.exists() to return False on its first call,
                # and True on its second call.  We use a handy generator as
                # the mock side effect for this.  The mocked function returns
                # what the side effect returns.

                def exists_side_effect():
                    yield False
                    yield True
                exists_mock = mocks.enter_context(
                    mock.patch.object(os.path, 'exists',
                                      side_effect=exists_side_effect()))
                device = cfg_ds.device_name_to_device(name)
                self.assertEquals(dev_name, device)

                find_mock.assert_called_once_with(mock.ANY)
                self.assertEqual(exists_mock.call_count, 2)

    def test_dev_os_map(self):
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        cfg_ds = ds.DataSourceConfigDrive(settings.CFG_BUILTIN,
                                          None,
                                          helpers.Paths({}))
        found = ds.read_config_drive(self.tmp)
        os_md = found['metadata']
        cfg_ds.metadata = os_md
        name_tests = {
            'ami': '/dev/vda1',
            'root': '/dev/vda1',
            'ephemeral0': '/dev/vda2',
            'swap': '/dev/vda3',
        }
        for name, dev_name in name_tests.items():
            with ExitStack() as mocks:
                find_mock = mocks.enter_context(
                    mock.patch.object(util, 'find_devs_with',
                                      return_value=[dev_name]))
                exists_mock = mocks.enter_context(
                    mock.patch.object(os.path, 'exists',
                                      return_value=True))
                device = cfg_ds.device_name_to_device(name)
                self.assertEquals(dev_name, device)

                find_mock.assert_called_once_with(mock.ANY)
                exists_mock.assert_called_once_with(mock.ANY)

    def test_dev_ec2_remap(self):
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        cfg_ds = ds.DataSourceConfigDrive(settings.CFG_BUILTIN,
                                          None,
                                          helpers.Paths({}))
        found = ds.read_config_drive(self.tmp)
        ec2_md = found['ec2-metadata']
        os_md = found['metadata']
        cfg_ds.ec2_metadata = ec2_md
        cfg_ds.metadata = os_md
        name_tests = {
            'ami': '/dev/vda1',
            'root': '/dev/vda1',
            'ephemeral0': '/dev/vda2',
            'swap': '/dev/vda3',
            None: None,
            'bob': None,
            'root2k': None,
        }
        for name, dev_name in name_tests.items():
            # We want os.path.exists() to return False on its first call,
            # and True on its second call.  We use a handy generator as
            # the mock side effect for this.  The mocked function returns
            # what the side effect returns.
            def exists_side_effect():
                yield False
                yield True
            with mock.patch.object(os.path, 'exists',
                                   side_effect=exists_side_effect()):
                device = cfg_ds.device_name_to_device(name)
                self.assertEquals(dev_name, device)
                # We don't assert the call count for os.path.exists() because
                # not all of the entries in name_tests results in two calls to
                # that function.  Specifically, 'root2k' doesn't seem to call
                # it at all.

    def test_dev_ec2_map(self):
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        cfg_ds = ds.DataSourceConfigDrive(settings.CFG_BUILTIN,
                                          None,
                                          helpers.Paths({}))
        found = ds.read_config_drive(self.tmp)
        ec2_md = found['ec2-metadata']
        os_md = found['metadata']
        cfg_ds.ec2_metadata = ec2_md
        cfg_ds.metadata = os_md
        name_tests = {
            'ami': '/dev/sda1',
            'root': '/dev/sda1',
            'ephemeral0': '/dev/sda2',
            'swap': '/dev/sda3',
            None: None,
            'bob': None,
            'root2k': None,
        }
        for name, dev_name in name_tests.items():
            with mock.patch.object(os.path, 'exists', return_value=True):
                device = cfg_ds.device_name_to_device(name)
                self.assertEquals(dev_name, device)

    def test_dir_valid(self):
        """Verify a dir is read as such."""

        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)

        found = ds.read_config_drive(self.tmp)

        expected_md = copy(OSTACK_META)
        expected_md['instance-id'] = expected_md['uuid']
        expected_md['local-hostname'] = expected_md['hostname']

        self.assertEqual(USER_DATA, found['userdata'])
        self.assertEqual(expected_md, found['metadata'])
        self.assertEqual(NETWORK_DATA, found['networkdata'])
        self.assertEqual(found['files']['/etc/foo.cfg'], CONTENT_0)
        self.assertEqual(found['files']['/etc/bar/bar.cfg'], CONTENT_1)

    def test_seed_dir_valid_extra(self):
        """Verify extra files do not affect datasource validity."""

        data = copy(CFG_DRIVE_FILES_V2)
        data["myfoofile.txt"] = "myfoocontent"
        data["openstack/latest/random-file.txt"] = "random-content"

        populate_dir(self.tmp, data)

        found = ds.read_config_drive(self.tmp)

        expected_md = copy(OSTACK_META)
        expected_md['instance-id'] = expected_md['uuid']
        expected_md['local-hostname'] = expected_md['hostname']

        self.assertEqual(expected_md, found['metadata'])

    def test_seed_dir_bad_json_metadata(self):
        """Verify that bad json in metadata raises BrokenConfigDriveDir."""
        data = copy(CFG_DRIVE_FILES_V2)

        data["openstack/2012-08-10/meta_data.json"] = "non-json garbage {}"
        data["openstack/2015-10-15/meta_data.json"] = "non-json garbage {}"
        data["openstack/latest/meta_data.json"] = "non-json garbage {}"

        populate_dir(self.tmp, data)

        self.assertRaises(openstack.BrokenMetadata,
                          ds.read_config_drive, self.tmp)

    def test_seed_dir_no_configdrive(self):
        """Verify that no metadata raises NonConfigDriveDir."""

        my_d = os.path.join(self.tmp, "non-configdrive")
        data = copy(CFG_DRIVE_FILES_V2)
        data["myfoofile.txt"] = "myfoocontent"
        data["openstack/latest/random-file.txt"] = "random-content"
        data["content/foo"] = "foocontent"

        self.assertRaises(openstack.NonReadable,
                          ds.read_config_drive, my_d)

    def test_seed_dir_missing(self):
        """Verify that missing seed_dir raises NonConfigDriveDir."""
        my_d = os.path.join(self.tmp, "nonexistantdirectory")
        self.assertRaises(openstack.NonReadable,
                          ds.read_config_drive, my_d)

    def test_find_candidates(self):
        devs_with_answers = {}

        def my_devs_with(*args, **kwargs):
            criteria = args[0] if len(args) else kwargs.pop('criteria', None)
            return devs_with_answers.get(criteria, [])

        def my_is_partition(dev):
            return dev[-1] in "0123456789" and not dev.startswith("sr")

        try:
            orig_find_devs_with = util.find_devs_with
            util.find_devs_with = my_devs_with

            orig_is_partition = util.is_partition
            util.is_partition = my_is_partition

            devs_with_answers = {"TYPE=vfat": [],
                                 "TYPE=iso9660": ["/dev/vdb"],
                                 "LABEL=config-2": ["/dev/vdb"]}
            self.assertEqual(["/dev/vdb"], ds.find_candidate_devs())

            # add a vfat item
            # zdd reverse sorts after vdb, but config-2 label is preferred
            devs_with_answers['TYPE=vfat'] = ["/dev/zdd"]
            self.assertEqual(["/dev/vdb", "/dev/zdd"],
                             ds.find_candidate_devs())

            # verify that partitions are considered, that have correct label.
            devs_with_answers = {"TYPE=vfat": ["/dev/sda1"],
                                 "TYPE=iso9660": [],
                                 "LABEL=config-2": ["/dev/vdb3"]}
            self.assertEqual(["/dev/vdb3"],
                             ds.find_candidate_devs())

        finally:
            util.find_devs_with = orig_find_devs_with
            util.is_partition = orig_is_partition

    def test_pubkeys_v2(self):
        """Verify that public-keys work in config-drive-v2."""
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        myds = cfg_ds_from_dir(self.tmp)
        self.assertEqual(myds.get_public_ssh_keys(),
                         [OSTACK_META['public_keys']['mykey']])

    def test_network_data_is_found(self):
        """Verify that network_data is present in ds in config-drive-v2."""
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        myds = cfg_ds_from_dir(self.tmp)
        self.assertEqual(myds.network_json, NETWORK_DATA)

    def test_network_config_is_converted(self):
        """Verify that network_data is converted and present on ds object."""
        populate_dir(self.tmp, CFG_DRIVE_FILES_V2)
        myds = cfg_ds_from_dir(self.tmp)
        network_config = ds.convert_network_data(NETWORK_DATA)
        self.assertEqual(myds.network_config, network_config)


def cfg_ds_from_dir(seed_d):
    found = ds.read_config_drive(seed_d)
    cfg_ds = ds.DataSourceConfigDrive(settings.CFG_BUILTIN, None,
                                      helpers.Paths({}))
    populate_ds_from_read_config(cfg_ds, seed_d, found)
    return cfg_ds


def populate_ds_from_read_config(cfg_ds, source, results):
    """Patch the DataSourceConfigDrive from the results of
    read_config_drive_dir hopefully in line with what it would have
    if cfg_ds.get_data had been successfully called"""
    cfg_ds.source = source
    cfg_ds.metadata = results.get('metadata')
    cfg_ds.ec2_metadata = results.get('ec2-metadata')
    cfg_ds.userdata_raw = results.get('userdata')
    cfg_ds.version = results.get('version')
    cfg_ds.network_json = results.get('networkdata')
    cfg_ds._network_config = ds.convert_network_data(cfg_ds.network_json)


def populate_dir(seed_dir, files):
    for (name, content) in files.items():
        path = os.path.join(seed_dir, name)
        dirname = os.path.dirname(path)
        if not os.path.isdir(dirname):
            os.makedirs(dirname)
        if isinstance(content, six.text_type):
            mode = "w"
        else:
            mode = "wb"

        with open(path, mode) as fp:
            fp.write(content)

# vi: ts=4 expandtab
