# This file is part of cloud-init. See LICENSE file for license information.

from collections import namedtuple
import copy
import os
from io import StringIO
from unittest import mock

import pytest

from cloudinit.cmd import main
from cloudinit import safeyaml
from cloudinit.util import (
    ensure_dir, load_file, write_file)
from cloudinit.tests.helpers import (
    FilesystemMockingTestCase, wrap_and_call)

mypaths = namedtuple('MyPaths', 'run_dir')
myargs = namedtuple('MyArgs', 'debug files force local reporter subcommand')


class TestMain(FilesystemMockingTestCase):
    with_logs = True
    allowed_subp = False

    def setUp(self):
        super(TestMain, self).setUp()
        self.new_root = self.tmp_dir()
        self.cloud_dir = self.tmp_path('var/lib/cloud/', dir=self.new_root)
        os.makedirs(self.cloud_dir)
        self.replicateTestRoot('simple_ubuntu', self.new_root)
        self.cfg = {
            'datasource_list': ['None'],
            'runcmd': ['ls /etc'],  # test ALL_DISTROS
            'system_info': {'paths': {'cloud_dir': self.cloud_dir,
                                      'run_dir': self.new_root}},
            'write_files': [
                {
                    'path': '/etc/blah.ini',
                    'content': 'blah',
                    'permissions': 0o755,
                },
            ],
            'cloud_init_modules': ['write-files', 'runcmd'],
        }
        cloud_cfg = safeyaml.dumps(self.cfg)
        ensure_dir(os.path.join(self.new_root, 'etc', 'cloud'))
        self.cloud_cfg_file = os.path.join(
            self.new_root, 'etc', 'cloud', 'cloud.cfg')
        write_file(self.cloud_cfg_file, cloud_cfg)
        self.patchOS(self.new_root)
        self.patchUtils(self.new_root)
        self.stderr = StringIO()
        self.patchStdoutAndStderr(stderr=self.stderr)

    def test_main_init_run_net_stops_on_file_no_net(self):
        """When no-net file is present, main_init does not process modules."""
        stop_file = os.path.join(self.cloud_dir, 'data', 'no-net')  # stop file
        write_file(stop_file, '')
        cmdargs = myargs(
            debug=False, files=None, force=False, local=False, reporter=None,
            subcommand='init')
        (_item1, item2) = wrap_and_call(
            'cloudinit.cmd.main',
            {'util.close_stdin': True,
             'netinfo.debug_info': 'my net debug info',
             'util.fixup_output': ('outfmt', 'errfmt')},
            main.main_init, 'init', cmdargs)
        # We should not run write_files module
        self.assertFalse(
            os.path.exists(os.path.join(self.new_root, 'etc/blah.ini')),
            'Unexpected run of write_files module produced blah.ini')
        self.assertEqual([], item2)
        # Instancify is called
        instance_id_path = 'var/lib/cloud/data/instance-id'
        self.assertFalse(
            os.path.exists(os.path.join(self.new_root, instance_id_path)),
            'Unexpected call to datasource.instancify produced instance-id')
        expected_logs = [
            "Exiting. stop file ['{stop_file}'] existed\n".format(
                stop_file=stop_file),
            'my net debug info'  # netinfo.debug_info
        ]
        for log in expected_logs:
            self.assertIn(log, self.stderr.getvalue())

    def test_main_init_run_net_runs_modules(self):
        """Modules like write_files are run in 'net' mode."""
        cmdargs = myargs(
            debug=False, files=None, force=False, local=False, reporter=None,
            subcommand='init')
        (_item1, item2) = wrap_and_call(
            'cloudinit.cmd.main',
            {'util.close_stdin': True,
             'netinfo.debug_info': 'my net debug info',
             'util.fixup_output': ('outfmt', 'errfmt')},
            main.main_init, 'init', cmdargs)
        self.assertEqual([], item2)
        # Instancify is called
        instance_id_path = 'var/lib/cloud/data/instance-id'
        self.assertEqual(
            'iid-datasource-none\n',
            os.path.join(load_file(
                os.path.join(self.new_root, instance_id_path))))
        # modules are run (including write_files)
        self.assertEqual(
            'blah', load_file(os.path.join(self.new_root, 'etc/blah.ini')))
        expected_logs = [
            'network config is disabled by fallback',  # apply_network_config
            'my net debug info',  # netinfo.debug_info
            'no previous run detected'
        ]
        for log in expected_logs:
            self.assertIn(log, self.stderr.getvalue())

    def test_main_init_run_net_calls_set_hostname_when_metadata_present(self):
        """When local-hostname metadata is present, call cc_set_hostname."""
        self.cfg['datasource'] = {
            'None': {'metadata': {'local-hostname': 'md-hostname'}}}
        cloud_cfg = safeyaml.dumps(self.cfg)
        write_file(self.cloud_cfg_file, cloud_cfg)
        cmdargs = myargs(
            debug=False, files=None, force=False, local=False, reporter=None,
            subcommand='init')

        def set_hostname(name, cfg, cloud, log, args):
            self.assertEqual('set-hostname', name)
            updated_cfg = copy.deepcopy(self.cfg)
            updated_cfg.update(
                {'def_log_file': '/var/log/cloud-init.log',
                 'log_cfgs': [],
                 'syslog_fix_perms': [
                     'syslog:adm', 'root:adm', 'root:wheel', 'root:root'
                 ],
                 'vendor_data': {'enabled': True, 'prefix': []},
                 'vendor_data2': {'enabled': True, 'prefix': []}})
            updated_cfg.pop('system_info')

            self.assertEqual(updated_cfg, cfg)
            self.assertEqual(main.LOG, log)
            self.assertIsNone(args)

        (_item1, item2) = wrap_and_call(
            'cloudinit.cmd.main',
            {'util.close_stdin': True,
             'netinfo.debug_info': 'my net debug info',
             'cc_set_hostname.handle': {'side_effect': set_hostname},
             'util.fixup_output': ('outfmt', 'errfmt')},
            main.main_init, 'init', cmdargs)
        self.assertEqual([], item2)
        # Instancify is called
        instance_id_path = 'var/lib/cloud/data/instance-id'
        self.assertEqual(
            'iid-datasource-none\n',
            os.path.join(load_file(
                os.path.join(self.new_root, instance_id_path))))
        # modules are run (including write_files)
        self.assertEqual(
            'blah', load_file(os.path.join(self.new_root, 'etc/blah.ini')))
        expected_logs = [
            'network config is disabled by fallback',  # apply_network_config
            'my net debug info',  # netinfo.debug_info
            'no previous run detected'
        ]
        for log in expected_logs:
            self.assertIn(log, self.stderr.getvalue())


class TestShouldBringUpInterfaces:
    @pytest.mark.parametrize('cfg_disable,args_local,expected', [
        (True, True, False),
        (True, False, False),
        (False, True, False),
        (False, False, True),
    ])
    def test_should_bring_up_interfaces(
        self, cfg_disable, args_local, expected
    ):
        init = mock.Mock()
        init.cfg = {'disable_network_activation': cfg_disable}

        args = mock.Mock()
        args.local = args_local

        result = main._should_bring_up_interfaces(init, args)
        assert result == expected

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