# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Test cases for twisted.protocols.postfix module.
"""

from typing import Dict, List, Tuple

from twisted.internet.testing import StringTransport
from twisted.protocols import postfix
from twisted.trial import unittest


class PostfixTCPMapQuoteTests(unittest.TestCase):
    data = [
        # (raw, quoted, [aliasQuotedForms]),
        (b"foo", b"foo"),
        (b"foo bar", b"foo%20bar"),
        (b"foo\tbar", b"foo%09bar"),
        (b"foo\nbar", b"foo%0Abar", b"foo%0abar"),
        (
            b"foo\r\nbar",
            b"foo%0D%0Abar",
            b"foo%0D%0abar",
            b"foo%0d%0Abar",
            b"foo%0d%0abar",
        ),
        (b"foo ", b"foo%20"),
        (b" foo", b"%20foo"),
    ]

    def testData(self):
        for entry in self.data:
            raw = entry[0]
            quoted = entry[1:]

            self.assertEqual(postfix.quote(raw), quoted[0])
            for q in quoted:
                self.assertEqual(postfix.unquote(q), raw)


class PostfixTCPMapServerTestCase:
    data: Dict[bytes, bytes] = {
        # 'key': 'value',
    }

    chat: List[Tuple[bytes, bytes]] = [
        # (input, expected_output),
    ]

    def test_chat(self):
        """
        Test that I{get} and I{put} commands are responded to correctly by
        L{postfix.PostfixTCPMapServer} when its factory is an instance of
        L{postifx.PostfixTCPMapDictServerFactory}.
        """
        factory = postfix.PostfixTCPMapDictServerFactory(self.data)
        transport = StringTransport()

        protocol = postfix.PostfixTCPMapServer()
        protocol.service = factory
        protocol.factory = factory
        protocol.makeConnection(transport)

        for input, expected_output in self.chat:
            protocol.lineReceived(input)
            self.assertEqual(
                transport.value(),
                expected_output,
                "For %r, expected %r but got %r"
                % (input, expected_output, transport.value()),
            )
            transport.clear()
        protocol.setTimeout(None)

    def test_deferredChat(self):
        """
        Test that I{get} and I{put} commands are responded to correctly by
        L{postfix.PostfixTCPMapServer} when its factory is an instance of
        L{postifx.PostfixTCPMapDeferringDictServerFactory}.
        """
        factory = postfix.PostfixTCPMapDeferringDictServerFactory(self.data)
        transport = StringTransport()

        protocol = postfix.PostfixTCPMapServer()
        protocol.service = factory
        protocol.factory = factory
        protocol.makeConnection(transport)

        for input, expected_output in self.chat:
            protocol.lineReceived(input)
            self.assertEqual(
                transport.value(),
                expected_output,
                "For {!r}, expected {!r} but got {!r}".format(
                    input, expected_output, transport.value()
                ),
            )
            transport.clear()
        protocol.setTimeout(None)

    def test_getException(self):
        """
        If the factory throws an exception,
        error code 400 must be returned.
        """

        class ErrorFactory:
            """
            Factory that raises an error on key lookup.
            """

            def get(self, key):
                raise Exception("This is a test error")

        server = postfix.PostfixTCPMapServer()
        server.factory = ErrorFactory()
        server.transport = StringTransport()
        server.lineReceived(b"get example")
        self.assertEqual(server.transport.value(), b"400 This is a test error\n")


class ValidTests(PostfixTCPMapServerTestCase, unittest.TestCase):
    data = {
        b"foo": b"ThisIs Foo",
        b"bar": b" bar really is found\r\n",
    }
    chat = [
        (b"get", b"400 Command 'get' takes 1 parameters.\n"),
        (b"get foo bar", b"500 \n"),
        (b"put", b"400 Command 'put' takes 2 parameters.\n"),
        (b"put foo", b"400 Command 'put' takes 2 parameters.\n"),
        (b"put foo bar baz", b"500 put is not implemented yet.\n"),
        (b"put foo bar", b"500 put is not implemented yet.\n"),
        (b"get foo", b"200 ThisIs%20Foo\n"),
        (b"get bar", b"200 %20bar%20really%20is%20found%0D%0A\n"),
        (b"get baz", b"500 \n"),
        (b"foo", b"400 unknown command\n"),
    ]