# This file is part of Buildbot.  Buildbot is free software: you can
# redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, version 2.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright Buildbot Team Members

from __future__ import absolute_import
from __future__ import print_function

import os
import sys

import mock

from twisted.python import log
from twisted.python import usage
from twisted.trial import unittest

from buildbot_worker.scripts import runner
from buildbot_worker.test.util import misc


class OptionsMixin(object):

    def assertOptions(self, opts, exp):
        got = {k: opts[k] for k in exp}
        if got != exp:
            msg = []
            for k in exp:
                if opts[k] != exp[k]:
                    msg.append(" {0}: expected {1!r}, got {2!r}".format(
                               k, exp[k], opts[k]))
            self.fail("did not get expected options\n" + ("\n".join(msg)))


class BaseDirTestsMixin(object):

    """
    Common tests for Options classes with 'basedir' parameter
    """

    GETCWD_PATH = "test-dir"
    ABSPATH_PREFIX = "test-prefix-"
    MY_BASEDIR = "my-basedir"

    # the options class to instantiate for test cases
    options_class = None

    def setUp(self):
        self.patch(os, "getcwd", lambda: self.GETCWD_PATH)
        self.patch(os.path, "abspath", lambda path: self.ABSPATH_PREFIX + path)

    def parse(self, *args):
        assert self.options_class is not None

        opts = self.options_class()
        opts.parseOptions(args)
        return opts

    def test_defaults(self):
        opts = self.parse()
        self.assertEqual(opts["basedir"],
                         self.ABSPATH_PREFIX + self.GETCWD_PATH,
                         "unexpected basedir path")

    def test_basedir_arg(self):
        opts = self.parse(self.MY_BASEDIR)
        self.assertEqual(opts["basedir"],
                         self.ABSPATH_PREFIX + self.MY_BASEDIR,
                         "unexpected basedir path")

    def test_too_many_args(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "I wasn't expecting so many arguments"):
            self.parse("arg1", "arg2")


class TestMakerBase(BaseDirTestsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.MakerBase class.
    """
    options_class = runner.MakerBase


class TestStopOptions(BaseDirTestsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.StopOptions class.
    """
    options_class = runner.StopOptions

    def test_synopsis(self):
        opts = runner.StopOptions()
        self.assertIn('buildbot-worker stop', opts.getSynopsis())


class TestStartOptions(OptionsMixin, BaseDirTestsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.StartOptions class.
    """
    options_class = runner.StartOptions

    def test_synopsis(self):
        opts = runner.StartOptions()
        self.assertIn('buildbot-worker start', opts.getSynopsis())

    def test_all_args(self):
        opts = self.parse("--quiet", "--nodaemon", self.MY_BASEDIR)
        self.assertOptions(opts,
                           dict(quiet=True, nodaemon=True,
                                basedir=self.ABSPATH_PREFIX + self.MY_BASEDIR))


class TestRestartOptions(OptionsMixin, BaseDirTestsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.RestartOptions class.
    """
    options_class = runner.RestartOptions

    def test_synopsis(self):
        opts = runner.RestartOptions()
        self.assertIn('buildbot-worker restart', opts.getSynopsis())

    def test_all_args(self):
        opts = self.parse("--quiet", "--nodaemon", self.MY_BASEDIR)
        self.assertOptions(opts,
                           dict(quiet=True, nodaemon=True,
                                basedir=self.ABSPATH_PREFIX + self.MY_BASEDIR))


class TestCreateWorkerOptions(OptionsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.CreateWorkerOptions class.
    """

    req_args = ["bdir", "mstr:5678", "name", "pswd"]

    def parse(self, *args):
        opts = runner.CreateWorkerOptions()
        opts.parseOptions(args)
        return opts

    def test_defaults(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "incorrect number of arguments"):
            self.parse()

    def test_synopsis(self):
        opts = runner.CreateWorkerOptions()
        self.assertIn('buildbot-worker create-worker', opts.getSynopsis())

    def test_min_args(self):

        # patch runner.MakerBase.postOptions() so that 'basedir'
        # argument will not be converted to absolute path
        self.patch(runner.MakerBase, "postOptions", mock.Mock())

        self.assertOptions(self.parse(*self.req_args),
                           dict(basedir="bdir", host="mstr", port=5678,
                                name="name", passwd="pswd"))

    def test_all_args(self):

        # patch runner.MakerBase.postOptions() so that 'basedir'
        # argument will not be converted to absolute path
        self.patch(runner.MakerBase, "postOptions", mock.Mock())

        opts = self.parse("--force", "--relocatable", "--no-logrotate",
                          "--keepalive=4", "--umask=0o22",
                          "--maxdelay=3", "--numcpus=4", "--log-size=2", "--log-count=1",
                          "--allow-shutdown=file", *self.req_args)
        self.assertOptions(opts,
                           {"force": True,
                            "relocatable": True,
                            "no-logrotate": True,
                            "umask": "0o22",
                            "maxdelay": 3,
                            "numcpus": "4",
                            "log-size": 2,
                            "log-count": "1",
                            "allow-shutdown": "file",
                            "basedir": "bdir",
                            "host": "mstr",
                            "port": 5678,
                            "name": "name",
                            "passwd": "pswd"})

    def test_master_url(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "<master> is not a URL - do not use URL"):
            self.parse("a", "http://b.c", "d", "e")

    def test_inv_keepalive(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "keepalive parameter needs to be a number"):
            self.parse("--keepalive=X", *self.req_args)

    def test_inv_maxdelay(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "maxdelay parameter needs to be a number"):
            self.parse("--maxdelay=X", *self.req_args)

    def test_inv_log_size(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "log-size parameter needs to be a number"):
            self.parse("--log-size=X", *self.req_args)

    def test_inv_log_count(self):
        with self.assertRaisesRegex(usage.UsageError,
                           "log-count parameter needs to be a number or None"):
            self.parse("--log-count=X", *self.req_args)

    def test_inv_numcpus(self):
        with self.assertRaisesRegex(usage.UsageError,
                           "numcpus parameter needs to be a number or None"):
            self.parse("--numcpus=X", *self.req_args)

    def test_inv_umask(self):
        with self.assertRaisesRegex(usage.UsageError,
                               "umask parameter needs to be a number or None"):
            self.parse("--umask=X", *self.req_args)

    def test_inv_allow_shutdown(self):
        with self.assertRaisesRegex(usage.UsageError,
                       "allow-shutdown needs to be one of 'signal' or 'file'"):
            self.parse("--allow-shutdown=X", *self.req_args)

    def test_too_few_args(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "incorrect number of arguments"):
            self.parse("arg1", "arg2")

    def test_too_many_args(self):
        with self.assertRaisesRegex(usage.UsageError,
                                    "incorrect number of arguments"):
            self.parse("extra_arg", *self.req_args)

    def test_validateMasterArgument_no_port(self):
        """
        test calling CreateWorkerOptions.validateMasterArgument()
        on <master> argument without port specified.
        """
        opts = runner.CreateWorkerOptions()
        self.assertEqual(opts.validateMasterArgument("mstrhost"),
                         ("mstrhost", 9989),
                         "incorrect master host and/or port")

    def test_validateMasterArgument_empty_master(self):
        """
        test calling CreateWorkerOptions.validateMasterArgument()
        on <master> without host part specified.
        """
        opts = runner.CreateWorkerOptions()
        with self.assertRaisesRegex(usage.UsageError,
                                    "invalid <master> argument ':1234'"):
            opts.validateMasterArgument(":1234")

    def test_validateMasterArgument_inv_port(self):
        """
        test calling CreateWorkerOptions.validateMasterArgument()
        on <master> without with unparsable port part
        """
        opts = runner.CreateWorkerOptions()
        with self.assertRaisesRegex(usage.UsageError,
                                    "invalid master port 'apple', "
                                    "needs to be a number"):
            opts.validateMasterArgument("host:apple")

    def test_validateMasterArgument_ok(self):
        """
        test calling CreateWorkerOptions.validateMasterArgument()
        on <master> without host and port parts specified.
        """
        opts = runner.CreateWorkerOptions()
        self.assertEqual(opts.validateMasterArgument("mstrhost:4321"),
                         ("mstrhost", 4321),
                         "incorrect master host and/or port")


class TestOptions(misc.StdoutAssertionsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.Options class.
    """

    def setUp(self):
        self.setUpStdoutAssertions()

    def parse(self, *args):
        opts = runner.Options()
        opts.parseOptions(args)
        return opts

    def test_defaults(self):
        with self.assertRaisesRegex(usage.UsageError, "must specify a command"):
            self.parse()

    def test_version(self):
        exception = self.assertRaises(SystemExit, self.parse, '--version')
        self.assertEqual(exception.code, 0, "unexpected exit code")
        self.assertInStdout('worker version:')

    def test_verbose(self):
        self.patch(log, 'startLogging', mock.Mock())
        with self.assertRaises(usage.UsageError):
            self.parse("--verbose")
        log.startLogging.assert_called_once_with(sys.stderr)


# used by TestRun.test_run_good to patch in a callback
functionPlaceholder = None


class TestRun(misc.StdoutAssertionsMixin, unittest.TestCase):

    """
    Test buildbot_worker.scripts.runner.run()
    """

    def setUp(self):
        self.setUpStdoutAssertions()

    class TestSubCommand(usage.Options):
        subcommandFunction = __name__ + ".functionPlaceholder"
        optFlags = [["test-opt", None, None]]

    class TestOptions(usage.Options):

        """
        Option class that emulates usage error. The 'suboptions' flag
        enables emulation of usage error in a sub-option.
        """
        optFlags = [["suboptions", None, None]]

        def postOptions(self):
            if self["suboptions"]:
                self.subOptions = "SubOptionUsage"
            raise usage.UsageError("usage-error-message")

        def __str__(self):
            return "GeneralUsage"

    def test_run_good(self):
        """
        Test successful invocation of worker command.
        """

        self.patch(sys, "argv", ["command", 'test', '--test-opt'])

        # patch runner module to use our test subcommand class
        self.patch(runner.Options, 'subCommands',
                   [['test', None, self.TestSubCommand, None]])

        # trace calls to subcommand function
        subcommand_func = mock.Mock(return_value=42)
        self.patch(sys.modules[__name__],
                   "functionPlaceholder",
                   subcommand_func)

        # check that subcommand function called with correct arguments
        # and that it's return value is used as exit code
        exception = self.assertRaises(SystemExit, runner.run)
        subcommand_func.assert_called_once_with({'test-opt': 1})
        self.assertEqual(exception.code, 42, "unexpected exit code")

    def test_run_bad_noargs(self):
        """
        Test handling of invalid command line arguments.
        """
        self.patch(sys, "argv", ["command"])

        # patch runner module to use test Options class
        self.patch(runner, "Options", self.TestOptions)

        exception = self.assertRaises(SystemExit, runner.run)
        self.assertEqual(exception.code, 1, "unexpected exit code")
        self.assertStdoutEqual("command:  usage-error-message\n\n"
                               "GeneralUsage\n",
                               "unexpected error message on stdout")

    def test_run_bad_suboption(self):
        """
        Test handling of invalid command line arguments in a suboption.
        """

        self.patch(sys, "argv", ["command", "--suboptions"])

        # patch runner module to use test Options class
        self.patch(runner, "Options", self.TestOptions)

        exception = self.assertRaises(SystemExit, runner.run)
        self.assertEqual(exception.code, 1, "unexpected exit code")

        # check that we get error message for a sub-option
        self.assertStdoutEqual("command:  usage-error-message\n\n"
                               "SubOptionUsage\n",
                               "unexpected error message on stdout")
