import os
import subprocess
import sys
from pathlib import Path

from django.db.backends.mysql.client import DatabaseClient
from django.test import SimpleTestCase


class MySqlDbshellCommandTestCase(SimpleTestCase):
    def settings_to_cmd_args_env(self, settings_dict, parameters=None):
        if parameters is None:
            parameters = []
        return DatabaseClient.settings_to_cmd_args_env(settings_dict, parameters)

    def test_fails_with_keyerror_on_incomplete_config(self):
        with self.assertRaises(KeyError):
            self.settings_to_cmd_args_env({})

    def test_basic_params_specified_in_settings(self):
        expected_args = [
            "mysql",
            "--user=someuser",
            "--host=somehost",
            "--port=444",
            "somedbname",
        ]
        expected_env = {"MYSQL_PWD": "somepassword"}
        self.assertEqual(
            self.settings_to_cmd_args_env(
                {
                    "NAME": "somedbname",
                    "USER": "someuser",
                    "PASSWORD": "somepassword",
                    "HOST": "somehost",
                    "PORT": 444,
                    "OPTIONS": {},
                }
            ),
            (expected_args, expected_env),
        )

    def test_options_override_settings_proper_values(self):
        settings_port = 444
        options_port = 555
        self.assertNotEqual(settings_port, options_port, "test pre-req")
        expected_args = [
            "mysql",
            "--user=optionuser",
            "--host=optionhost",
            "--port=%s" % options_port,
            "optiondbname",
        ]
        expected_env = {"MYSQL_PWD": "optionpassword"}
        for keys in [("database", "password"), ("db", "passwd")]:
            with self.subTest(keys=keys):
                database, password = keys
                self.assertEqual(
                    self.settings_to_cmd_args_env(
                        {
                            "NAME": "settingdbname",
                            "USER": "settinguser",
                            "PASSWORD": "settingpassword",
                            "HOST": "settinghost",
                            "PORT": settings_port,
                            "OPTIONS": {
                                database: "optiondbname",
                                "user": "optionuser",
                                password: "optionpassword",
                                "host": "optionhost",
                                "port": options_port,
                            },
                        }
                    ),
                    (expected_args, expected_env),
                )

    def test_options_non_deprecated_keys_preferred(self):
        expected_args = [
            "mysql",
            "--user=someuser",
            "--host=somehost",
            "--port=444",
            "optiondbname",
        ]
        expected_env = {"MYSQL_PWD": "optionpassword"}
        self.assertEqual(
            self.settings_to_cmd_args_env(
                {
                    "NAME": "settingdbname",
                    "USER": "someuser",
                    "PASSWORD": "settingpassword",
                    "HOST": "somehost",
                    "PORT": 444,
                    "OPTIONS": {
                        "database": "optiondbname",
                        "db": "deprecatedoptiondbname",
                        "password": "optionpassword",
                        "passwd": "deprecatedoptionpassword",
                    },
                }
            ),
            (expected_args, expected_env),
        )

    def test_options_charset(self):
        expected_args = [
            "mysql",
            "--user=someuser",
            "--host=somehost",
            "--port=444",
            "--default-character-set=utf8",
            "somedbname",
        ]
        expected_env = {"MYSQL_PWD": "somepassword"}
        self.assertEqual(
            self.settings_to_cmd_args_env(
                {
                    "NAME": "somedbname",
                    "USER": "someuser",
                    "PASSWORD": "somepassword",
                    "HOST": "somehost",
                    "PORT": 444,
                    "OPTIONS": {"charset": "utf8"},
                }
            ),
            (expected_args, expected_env),
        )

    def test_can_connect_using_sockets(self):
        expected_args = [
            "mysql",
            "--user=someuser",
            "--socket=/path/to/mysql.socket.file",
            "somedbname",
        ]
        expected_env = {"MYSQL_PWD": "somepassword"}
        self.assertEqual(
            self.settings_to_cmd_args_env(
                {
                    "NAME": "somedbname",
                    "USER": "someuser",
                    "PASSWORD": "somepassword",
                    "HOST": "/path/to/mysql.socket.file",
                    "PORT": None,
                    "OPTIONS": {},
                }
            ),
            (expected_args, expected_env),
        )

    def test_ssl_certificate_is_added(self):
        expected_args = [
            "mysql",
            "--user=someuser",
            "--host=somehost",
            "--port=444",
            "--ssl-ca=sslca",
            "--ssl-cert=sslcert",
            "--ssl-key=sslkey",
            "somedbname",
        ]
        expected_env = {"MYSQL_PWD": "somepassword"}
        self.assertEqual(
            self.settings_to_cmd_args_env(
                {
                    "NAME": "somedbname",
                    "USER": "someuser",
                    "PASSWORD": "somepassword",
                    "HOST": "somehost",
                    "PORT": 444,
                    "OPTIONS": {
                        "ssl": {
                            "ca": "sslca",
                            "cert": "sslcert",
                            "key": "sslkey",
                        },
                    },
                }
            ),
            (expected_args, expected_env),
        )

    def test_parameters(self):
        self.assertEqual(
            self.settings_to_cmd_args_env(
                {
                    "NAME": "somedbname",
                    "USER": None,
                    "PASSWORD": None,
                    "HOST": None,
                    "PORT": None,
                    "OPTIONS": {},
                },
                ["--help"],
            ),
            (["mysql", "somedbname", "--help"], None),
        )

    def test_crash_password_does_not_leak(self):
        # The password doesn't leak in an exception that results from a client
        # crash.
        args, env = DatabaseClient.settings_to_cmd_args_env(
            {
                "NAME": "somedbname",
                "USER": "someuser",
                "PASSWORD": "somepassword",
                "HOST": "somehost",
                "PORT": 444,
                "OPTIONS": {},
            },
            [],
        )
        if env:
            env = {**os.environ, **env}
        fake_client = Path(__file__).with_name("fake_client.py")
        args[0:1] = [sys.executable, str(fake_client)]
        with self.assertRaises(subprocess.CalledProcessError) as ctx:
            subprocess.run(args, check=True, env=env)
        self.assertNotIn("somepassword", str(ctx.exception))