# -*- coding: utf-8 -*-
"""
Test connection to database.
"""

from __future__ import with_statement
from os import path, makedirs, environ
import re
import unittest
import tempfile

import pytest

from pymssql import _mssql

from .helpers import config, mssqlconn
server = config.server
username = config.user
password = config.password
database = config.database
port = config.port
ipaddress = config.ipaddress
instance = config.instance


@pytest.mark.mssql_server_required
class TestCons(unittest.TestCase):

    def connect(self, **kwargs):
        with tempfile.TemporaryDirectory() as tmpdir:
            config_dump_path = path.join(tmpdir, 'freetds-config-dump.txt')
            dump_path = path.join(tmpdir, 'freetds-dump.txt')
            environ['TDSDUMPCONFIG'] = config_dump_path
            environ['TDSDUMP'] = dump_path
            _mssql.connect(**kwargs)
            with open(config_dump_path, 'r') as fh:
                return fh.read()

    def test_connection_tds_version(self):

        for tds_version in ('4.2', '7.0', '7.1', '7.2', '7.3', '7.4'):
            with self.subTest(f"{tds_version}", tds_version=tds_version):
                cdump = self.connect(server=server, port=port,
                                    user=username, password=password,
                                    tds_version=tds_version)
                major_version = re.search('major_version = (\\S+)', cdump).groups()[0]
                minor_version = re.search('minor_version = (\\S+)', cdump).groups()[0]
                actual_version = f"{major_version}.{minor_version}"
                self.assertEqual(tds_version, actual_version)

    def test_connection_by_dns_name(self):
        cdump = self.connect(server=server, port=port, user=username, password=password)
        dump_server_name = re.search('server_name = (\\S+)', cdump).groups()[0]
        self.assertIn(server, dump_server_name)
        dump_server_host_name = re.search('server_host_name = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_server_host_name, server)
        dump_user_name = re.search('user_name = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_user_name, username)
        dump_port = re.search('port = (\\S+)', cdump).groups()[0]
        self.assertIn(port, dump_port)

    def test_connection_by_ip(self):
        cdump = self.connect(server=ipaddress, port=port, user=username, password=password)
        dump_server_name = re.search('server_name = (\\S+)', cdump).groups()[0]
        self.assertIn(ipaddress, dump_server_name)
        dump_server_host_name = re.search('server_host_name = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_server_host_name, ipaddress)

    def test_port_override_ipaddress(self):
        server_join = '%s:%s' % (ipaddress, port)
        cdump = self.connect(server=server_join, user=username, password=password)
        dump_server_name = re.search('server_name = (\\S+)', cdump).groups()[0]
        self.assertIn(ipaddress, dump_server_name)
        dump_server_host_name = re.search('server_host_name = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_server_host_name, ipaddress)
        dump_port = re.search('port = (\\S+)', cdump).groups()[0]
        self.assertIn(port, dump_port)

    def test_port_override_name(self):
        server_join = '%s:%s' % (server, port)
        cdump = self.connect(server=server_join, user=username, password=password)
        dump_server_name = re.search('server_name = (\\S+)', cdump).groups()[0]
        self.assertIn(server, dump_server_name)
        dump_server_host_name = re.search('server_host_name = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_server_host_name, server)
        dump_port = re.search('port = (\\S+)', cdump).groups()[0]
        self.assertIn(port, dump_port)

    def test_instance(self):
        if not instance:
            pytest.skip()
        server_join = r'%s\%s' % (server, instance)
        cdump = self.connect(server=server_join, user=username, password=password)
        dump_server_name = re.search('server_name = (\\S+)', cdump).groups()[0]
        self.assertIn(server, dump_server_name)
        dump_server_host_name = re.search('server_host_name = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_server_host_name, server)
        dump_port = re.search('port = (\\S+)', cdump).groups()[0]
        self.assertEqual(dump_port, 0)

    def test_valid_tds_version_property(self):
        # Issue #211 (https://github.com/pymssql/pymssql/issues/211)
        conn = mssqlconn()
        self.assertIsNotNone(conn.tds_version)
        self.assertTrue(conn.tds_version > 0)
        conn.close()

    def test_conn_props_override(self):
        conn = mssqlconn(conn_properties='SET TEXTSIZE 2147483647')
        conn.close()

        conn = mssqlconn(conn_properties='SET TEXTSIZE 2147483647;')
        conn.close()

        conn = mssqlconn(conn_properties='SET TEXTSIZE 2147483647;SET ANSI_NULLS ON;')
        conn.close()

        conn = mssqlconn(conn_properties='SET TEXTSIZE 2147483647;SET ANSI_NULLS ON')
        conn.close()

        conn = mssqlconn(conn_properties='SET TEXTSIZE 2147483647;'
                         'SET ANSI_NULLS ON;')
        conn.close()

        conn = mssqlconn(conn_properties=['SET TEXTSIZE 2147483647;', 'SET ANSI_NULLS ON'])
        conn.close()
        self.assertRaises(_mssql.MSSQLDriverException, mssqlconn, conn_properties='BOGUS SQL')

        conn = _mssql.connect(
            conn_properties='SET TEXTSIZE 2147483647',
            server=server,
            user=username,
            password=password
        )
        conn.close()


@pytest.mark.slow
class TestFailedConnection(unittest.TestCase):

    @pytest.mark.xfail(strict=False, reason="Could timeout, or fail with different error messages")
    @pytest.mark.timeout(600)
    def test_repeated_failed_connections(self):
        # This is a test for https://github.com/pymssql/pymssql/issues/145
        # (Repeated failed connections result in error string getting longer
        # and longer)

        _mssql.login_timeout = 5
        last_exc_message = None
        for i in range(5):
            try:
                _mssql.connect(
                    server='www.google.com',
                    port=81,
                    user='joe',
                    password='secret',
                    database='tempdb')
            except Exception as exc:
                exc_message = exc.args[0][1]

                if last_exc_message:
                    self.assertEqual(exc_message, last_exc_message)

                last_exc_message = exc_message