# Copyright 2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
#     http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
from awscli.testutils import mock, unittest

from awscli.clidriver import CLIDriver
from awscli.customizations.commands import BasicHelp, BasicCommand
from awscli.customizations.commands import BasicDocHandler
from botocore.hooks import HierarchicalEmitter
from tests.unit.test_clidriver import FakeSession, FakeCommand


class MockCustomCommand(BasicCommand):
    NAME = 'mock'

    SUBCOMMANDS = [{'name': 'basic', 'command_class': BasicCommand}]


class TestCommandLoader(unittest.TestCase):

    def test_basic_help_with_contents(self):
        cmd_object = mock.Mock()
        mock_module = mock.Mock()
        mock_module.__file__ = '/some/root'
        cmd_object.DESCRIPTION = BasicCommand.FROM_FILE(
            'foo', 'bar', 'baz.txt', root_module=mock_module)
        help_command = BasicHelp(mock.Mock(), cmd_object, {}, {})
        with mock.patch('awscli.customizations.commands._open') as mock_open:
            mock_open.return_value.__enter__.return_value.read.return_value = \
                'fake description'
            self.assertEqual(help_command.description, 'fake description')


class TestBasicCommand(unittest.TestCase):

    def setUp(self):
        self.session = mock.Mock()
        self.command = BasicCommand(self.session)

    def test_load_arg_table_property(self):
        # Ensure ``_build_arg_table()`` is called if it has not been
        # built via the ``arg_table`` property.  It should be an empty
        # dictionary.
        orig_arg_table = self.command.arg_table
        self.assertEqual(orig_arg_table, {})
        # Ensure the ``arg_table`` is not built again if
        # ``arg_table`` property is called again.
        self.assertIs(orig_arg_table, self.command.arg_table)

    def test_load_subcommand_table_property(self):
        # Ensure ``_build_subcommand_table()`` is called if it has not
        # been built via the ``subcommand_table`` property. It should be
        # an empty dictionary.
        orig_subcommand_table = self.command.subcommand_table
        self.assertEqual(orig_subcommand_table, {})
        # Ensure the ``subcommand_table`` is not built again if
        # ``subcommand_table`` property is called again.
        self.assertIs(orig_subcommand_table, self.command.subcommand_table)

    def test_load_lineage(self):
        self.assertEqual(self.command.lineage, [self.command])
        self.assertEqual(self.command.lineage_names, [self.command.name])

    def test_pass_lineage_to_child_command(self):
        self.command = MockCustomCommand(self.session)
        subcommand = self.command.subcommand_table['basic']
        lineage = subcommand.lineage
        self.assertEqual(len(lineage), 2)
        self.assertEqual(lineage[0], self.command)
        self.assertIsInstance(lineage[1], BasicCommand)
        self.assertEqual(
            subcommand.lineage_names,
            [self.command.name, subcommand.name]
        )

    def test_event_class(self):
        self.command = MockCustomCommand(self.session)
        help_command = self.command.create_help_command()
        self.assertEqual(help_command.event_class, 'mock')
        subcommand = self.command.subcommand_table['basic']
        sub_help_command = subcommand.create_help_command()
        # Note that the name of this Subcommand was never changed even
        # though it was put into the table as ``basic``. If no name
        # is overridden it uses the name ``commandname``.
        self.assertEqual(sub_help_command.event_class, 'mock.commandname')


class TestBasicCommandHooks(unittest.TestCase):
    # These tests verify the proper hooks are emitted from BasicCommand.

    def setUp(self):
        self.session = FakeSession()
        self.emitter = mock.Mock(wraps=HierarchicalEmitter())
        self.session.emitter = self.emitter

    def assert_events_fired_in_order(self, events):
        args = self.emitter.emit.call_args_list
        actual_events = [arg[0][0] for arg in args]
        self.assertEqual(actual_events, events)

    def inject_command(self, command_table, **kwargs):
        command = FakeCommand(self.session)
        command.NAME = 'foo'
        command_table['foo'] = command

    def test_expected_events_are_emitted_in_order(self):
        driver = CLIDriver(session=self.session)
        self.emitter.register(
            'building-command-table.s3', self.inject_command)

        driver.main('s3 foo'.split())

        self.assert_events_fired_in_order([
            'building-command-table.main',
            'building-top-level-params',
            'top-level-args-parsed',
            'session-initialized',
            'building-command-table.s3',
            'building-command-table.foo',
            'building-arg-table.foo',
            'before-building-argument-table-parser.s3.foo'
        ])


class TestBasicDocHandler(unittest.TestCase):
    def setUp(self):
        self.session = mock.Mock()
        self.obj = MockCustomCommand(self.session)
        self.command_table = {}
        self.arg_table = {}

    def create_help_command(self):
        return BasicHelp(
            self.session, self.obj, self.command_table, self.arg_table
        )

    def create_arg_table(self):
        return CLIDriver().create_help_command().arg_table

    def generate_global_option_docs(self, help_command):
        operation_handler = BasicDocHandler(help_command)
        operation_handler.doc_global_option(help_command=help_command)
        return help_command.doc.getvalue().decode('utf-8')

    def generate_global_synopsis_docs(self, help_command):
        operation_handler = BasicDocHandler(help_command)
        operation_handler.doc_synopsis_end(help_command=help_command)
        return help_command.doc.getvalue().decode('utf-8')

    def assert_global_args_documented(self, arg_table, content):
        for arg in arg_table:
            self.assertIn(arg_table.get(arg).cli_name, content)

    def assert_global_args_not_documented(self, arg_table, content):
        for arg in arg_table:
            self.assertNotIn(arg_table.get(arg).cli_name, content)

    def test_includes_global_options_when_command_table_empty(self):
        help_command = self.create_help_command()
        arg_table = self.create_arg_table()
        help_command.arg_table = arg_table
        rendered = self.generate_global_option_docs(help_command)
        self.assert_global_args_documented(arg_table, rendered)

    def test_excludes_global_options_when_command_table_not_empty(self):
        help_command = self.create_help_command()
        arg_table = self.create_arg_table()
        help_command.arg_table = arg_table
        fake_command = FakeCommand(FakeSession())
        fake_command.NAME = 'command'
        help_command.command_table = {'command': fake_command}
        rendered = self.generate_global_option_docs(help_command)
        self.assert_global_args_not_documented(arg_table, rendered)

    def test_includes_global_synopsis_when_command_table_empty(self):
        help_command = self.create_help_command()
        arg_table = self.create_arg_table()
        help_command.arg_table = arg_table
        rendered = self.generate_global_synopsis_docs(help_command)
        self.assert_global_args_documented(arg_table, rendered)

    def test_excludes_global_synopsis_when_command_table_not_empty(self):
        help_command = self.create_help_command()
        arg_table = self.create_arg_table()
        help_command.arg_table = arg_table
        fake_command = FakeCommand(FakeSession())
        fake_command.NAME = 'command'
        help_command.command_table = {'command': fake_command}
        rendered = self.generate_global_synopsis_docs(help_command)
        self.assert_global_args_not_documented(arg_table, rendered)
