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import sys

import unittest

from optparse import make_option

from webkitpy.common.system.outputcapture import OutputCapture

from webkitpy.tool.multicommandtool import MultiCommandTool, Command, TryAgain

class TrivialCommand(Command):

    name = "trivial"

    show_in_main_help = True

    def __init__(self, **kwargs):

        Command.__init__(self, "help text", **kwargs)

    def execute(self, options, args, tool):

        pass

class UncommonCommand(TrivialCommand):

    name = "uncommon"

    show_in_main_help = False

class LikesToRetry(Command):

    name = "likes-to-retry"

    show_in_main_help = True

    def __init__(self, **kwargs):

        Command.__init__(self, "help text", **kwargs)

        self.execute_count = 0

    def execute(self, options, args, tool):

        self.execute_count += 1

        if self.execute_count < 2:

            raise TryAgain()

class CommandTest(unittest.TestCase):

    def test_name_with_arguments(self):

        command_with_args = TrivialCommand(argument_names="ARG1 ARG2")

        self.assertEqual(command_with_args.name_with_arguments(), "trivial ARG1 ARG2")

        command_with_args = TrivialCommand(options=[make_option("--my_option")])

        self.assertEqual(command_with_args.name_with_arguments(), "trivial [options]")

    def test_parse_required_arguments(self):

        self.assertEqual(Command._parse_required_arguments("ARG1 ARG2"), ["ARG1", "ARG2"])

        self.assertEqual(Command._parse_required_arguments("[ARG1] [ARG2]"), [])

        self.assertEqual(Command._parse_required_arguments("[ARG1] ARG2"), ["ARG2"])

        # Note: We might make our arg parsing smarter in the future and allow this type of arguments string.

        self.assertRaises(Exception, Command._parse_required_arguments, "[ARG1 ARG2]")

    def test_required_arguments(self):

        two_required_arguments = TrivialCommand(argument_names="ARG1 ARG2 [ARG3]")

        expected_missing_args_error = "2 arguments required, 1 argument provided.  Provided: 'foo'  Required: ARG1 ARG2\nSee 'trivial-tool help trivial' for usage.\n"

        exit_code = OutputCapture().assert_outputs(self, two_required_arguments.check_arguments_and_execute, [None, ["foo"], TrivialTool()], expected_stderr=expected_missing_args_error)

        self.assertEqual(exit_code, 1)

class TrivialTool(MultiCommandTool):

    def __init__(self, commands=None):

        MultiCommandTool.__init__(self, name="trivial-tool", commands=commands)

    def path(self):

        return __file__

    def should_execute_command(self, command):

        return (True, None)

class MultiCommandToolTest(unittest.TestCase):

    def _assert_split(self, args, expected_split):

        self.assertEqual(MultiCommandTool._split_command_name_from_args(args), expected_split)

    def test_split_args(self):

        # MultiCommandToolTest._split_command_name_from_args returns: (command, args)

        full_args = ["--global-option", "command", "--option", "arg"]

        full_args_expected = ("command", ["--global-option", "--option", "arg"])

        self._assert_split(full_args, full_args_expected)

        full_args = []

        full_args_expected = (None, [])

        self._assert_split(full_args, full_args_expected)

        full_args = ["command", "arg"]

        full_args_expected = ("command", ["arg"])

        self._assert_split(full_args, full_args_expected)

    def test_command_by_name(self):

        # This also tests Command auto-discovery.

        tool = TrivialTool()

        self.assertEqual(tool.command_by_name("trivial").name, "trivial")

        self.assertEqual(tool.command_by_name("bar"), None)

    def _assert_tool_main_outputs(self, tool, main_args, expected_stdout, expected_stderr = "", expected_exit_code=0):

        exit_code = OutputCapture().assert_outputs(self, tool.main, [main_args], expected_stdout=expected_stdout, expected_stderr=expected_stderr)

        self.assertEqual(exit_code, expected_exit_code)

    def test_retry(self):

        likes_to_retry = LikesToRetry()

        tool = TrivialTool(commands=[likes_to_retry])

        tool.main(["tool", "likes-to-retry"])

        self.assertEqual(likes_to_retry.execute_count, 2)

    def test_global_help(self):

        tool = TrivialTool(commands=[TrivialCommand(), UncommonCommand()])

        expected_common_commands_help = """Usage: trivial-tool [options] COMMAND [ARGS]

Options:

  -h, --help  show this help message and exit

Common trivial-tool commands:

   trivial   help text

See 'trivial-tool help --all-commands' to list all commands.

See 'trivial-tool help COMMAND' for more information on a specific command.

"""

        self._assert_tool_main_outputs(tool, ["tool"], expected_common_commands_help)

        self._assert_tool_main_outputs(tool, ["tool", "help"], expected_common_commands_help)

        expected_all_commands_help = """Usage: trivial-tool [options] COMMAND [ARGS]

Options:

  -h, --help  show this help message and exit

All trivial-tool commands:

   help       Display information about this program or its subcommands

   trivial    help text

   uncommon   help text

See 'trivial-tool help --all-commands' to list all commands.

See 'trivial-tool help COMMAND' for more information on a specific command.

"""

        self._assert_tool_main_outputs(tool, ["tool", "help", "--all-commands"], expected_all_commands_help)

        # Test that arguments can be passed before commands as well

        self._assert_tool_main_outputs(tool, ["tool", "--all-commands", "help"], expected_all_commands_help)

    def test_command_help(self):

        command_with_options = TrivialCommand(options=[make_option("--my_option")], long_help="LONG HELP")

        tool = TrivialTool(commands=[command_with_options])

        expected_subcommand_help = "trivial [options]   help text\n\nLONG HELP\n\nOptions:\n  --my_option=MY_OPTION\n\n"

        self._assert_tool_main_outputs(tool, ["tool", "help", "trivial"], expected_subcommand_help)

if __name__ == "__main__":

    unittest.main()