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import argparse
import contextlib
import io
import re
from collections import Counter
from unittest import TestCase

from notification_service.cli import cli_parser

# Can not be `--snake_case` or contain uppercase letter
ILLEGAL_LONG_OPTION_PATTERN = re.compile("^--[a-z]+_[a-z]+|^--.*[A-Z].*")
# Only can be `-[a-z]` or `-[A-Z]`
LEGAL_SHORT_OPTION_PATTERN = re.compile("^-[a-zA-z]$")

cli_args = {k: v for k, v in cli_parser.__dict__.items() if k.startswith("ARG_")}


class TestCli(TestCase):
    def test_arg_option_long_only(self):
        """
        Test if the name of cli.args long option valid
        """
        optional_long = [
            arg for arg in cli_args.values() if len(arg.flags) == 1 and arg.flags[0].startswith("-")
        ]
        for arg in optional_long:
            self.assertIsNone(ILLEGAL_LONG_OPTION_PATTERN.match(arg.flags[0]), f"{arg.flags[0]} is not match")

    def test_arg_option_mix_short_long(self):
        """
        Test if the name of cli.args mix option (-s, --long) valid
        """
        optional_mix = [
            arg for arg in cli_args.values() if len(arg.flags) == 2 and arg.flags[0].startswith("-")
        ]
        for arg in optional_mix:
            self.assertIsNotNone(
                LEGAL_SHORT_OPTION_PATTERN.match(arg.flags[0]), f"{arg.flags[0]} is not match"
            )
            self.assertIsNone(ILLEGAL_LONG_OPTION_PATTERN.match(arg.flags[1]), f"{arg.flags[1]} is not match")

    def test_subcommand_conflict(self):
        """
        Test if each of cli.*_COMMANDS without conflict subcommand
        """
        subcommand = {
            var: cli_parser.__dict__.get(var)
            for var in cli_parser.__dict__
            if var.isupper() and var.startswith("COMMANDS")
        }
        for group_name, sub in subcommand.items():
            name = [command.name.lower() for command in sub]
            self.assertEqual(
                len(name), len(set(name)), f"Command group {group_name} have conflict subcommand"
            )

    def test_subcommand_arg_name_conflict(self):
        """
        Test if each of cli.*_COMMANDS.arg name without conflict
        """
        subcommand = {
            var: cli_parser.__dict__.get(var)
            for var in cli_parser.__dict__
            if var.isupper() and var.startswith("COMMANDS")
        }
        for group, command in subcommand.items():
            for com in command:
                conflict_arg = [arg for arg, count in Counter(com.args).items() if count > 1]
                self.assertListEqual(
                    [],
                    conflict_arg,
                    f"Command group {group} function {com.name} have " f"conflict args name {conflict_arg}",
                )

    def test_subcommand_arg_flag_conflict(self):
        """
        Test if each of cli.*_COMMANDS.arg flags without conflict
        """
        subcommand = {
            key: val
            for key, val in cli_parser.__dict__.items()
            if key.isupper() and key.startswith("COMMANDS")
        }
        for group, command in subcommand.items():
            for com in command:
                position = [
                    a.flags[0] for a in com.args if (len(a.flags) == 1 and not a.flags[0].startswith("-"))
                ]
                conflict_position = [arg for arg, count in Counter(position).items() if count > 1]
                self.assertListEqual(
                    [],
                    conflict_position,
                    f"Command group {group} function {com.name} have conflict "
                    f"position flags {conflict_position}",
                )

                long_option = [
                    a.flags[0] for a in com.args if (len(a.flags) == 1 and a.flags[0].startswith("-"))
                ] + [a.flags[1] for a in com.args if len(a.flags) == 2]
                conflict_long_option = [arg for arg, count in Counter(long_option).items() if count > 1]
                self.assertListEqual(
                    [],
                    conflict_long_option,
                    f"Command group {group} function {com.name} have conflict "
                    f"long option flags {conflict_long_option}",
                )

                short_option = [a.flags[0] for a in com.args if len(a.flags) == 2]
                conflict_short_option = [arg for arg, count in Counter(short_option).items() if count > 1]
                self.assertEqual(
                    [],
                    conflict_short_option,
                    f"Command group {group} function {com.name} have conflict "
                    f"short option flags {conflict_short_option}",
                )

    def test_falsy_default_value(self):
        arg = cli_parser.Arg(("--test",), default=0, type=int)
        parser = argparse.ArgumentParser()
        arg.add_to_parser(parser)

        args = parser.parse_args(['--test', '10'])
        self.assertEqual(args.test, 10)

        args = parser.parse_args([])
        self.assertEqual(args.test, 0)

    def test_commands_and_command_group_sections(self):
        parser = cli_parser.get_parser()

        with contextlib.redirect_stdout(io.StringIO()) as stdout:
            with self.assertRaises(SystemExit):
                parser.parse_args(['--help'])
            stdout = stdout.getvalue()
        self.assertIn("Commands", stdout)
        self.assertIn("Groups", stdout)

    def test_should_display_help(self):
        parser = cli_parser.get_parser()

        all_command_as_args = [
            command_as_args
            for top_command in cli_parser.notification_commands
            for command_as_args in (
                [[top_command.name]]
                if isinstance(top_command, cli_parser.ActionCommand)
                else [[top_command.name, nested_command.name] for nested_command in top_command.subcommands]
            )
        ]
        for cmd_args in all_command_as_args:
            with self.assertRaises(SystemExit):
                parser.parse_args([*cmd_args, '--help'])
