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

"""
Test cases for L{twisted.protocols.haproxy.V1Parser}.
"""

from twisted.internet import address
from twisted.trial import unittest
from .. import _v1parser
from .._exceptions import InvalidNetworkProtocol, InvalidProxyHeader, MissingAddressData


class V1ParserTests(unittest.TestCase):
    """
    Test L{twisted.protocols.haproxy.V1Parser} behaviour.
    """

    def test_missingPROXYHeaderValue(self) -> None:
        """
        Test that an exception is raised when the PROXY header is missing.
        """
        self.assertRaises(
            InvalidProxyHeader,
            _v1parser.V1Parser.parse,
            b"NOTPROXY ",
        )

    def test_invalidNetworkProtocol(self) -> None:
        """
        Test that an exception is raised when the proto is not TCP or UNKNOWN.
        """
        self.assertRaises(
            InvalidNetworkProtocol,
            _v1parser.V1Parser.parse,
            b"PROXY WUTPROTO ",
        )

    def test_missingSourceData(self) -> None:
        """
        Test that an exception is raised when the proto has no source data.
        """
        self.assertRaises(
            MissingAddressData,
            _v1parser.V1Parser.parse,
            b"PROXY TCP4 ",
        )

    def test_missingDestData(self) -> None:
        """
        Test that an exception is raised when the proto has no destination.
        """
        self.assertRaises(
            MissingAddressData,
            _v1parser.V1Parser.parse,
            b"PROXY TCP4 127.0.0.1 8080 8888",
        )

    def test_fullParsingSuccess(self) -> None:
        """
        Test that parsing is successful for a PROXY header.
        """
        info = _v1parser.V1Parser.parse(
            b"PROXY TCP4 127.0.0.1 127.0.0.1 8080 8888",
        )
        self.assertIsInstance(info.source, address.IPv4Address)
        assert isinstance(info.source, address.IPv4Address)
        assert isinstance(info.destination, address.IPv4Address)  # type: ignore[unreachable]
        self.assertEqual(info.source.host, "127.0.0.1")
        self.assertEqual(info.source.port, 8080)
        self.assertEqual(info.destination.host, "127.0.0.1")
        self.assertEqual(info.destination.port, 8888)

    def test_fullParsingSuccess_IPv6(self) -> None:
        """
        Test that parsing is successful for an IPv6 PROXY header.
        """
        info = _v1parser.V1Parser.parse(
            b"PROXY TCP6 ::1 ::1 8080 8888",
        )
        self.assertIsInstance(info.source, address.IPv6Address)
        assert isinstance(info.source, address.IPv6Address)
        assert isinstance(info.destination, address.IPv6Address)  # type: ignore[unreachable]
        self.assertEqual(info.source.host, "::1")
        self.assertEqual(info.source.port, 8080)
        self.assertEqual(info.destination.host, "::1")
        self.assertEqual(info.destination.port, 8888)

    def test_fullParsingSuccess_UNKNOWN(self) -> None:
        """
        Test that parsing is successful for a UNKNOWN PROXY header.
        """
        info = _v1parser.V1Parser.parse(
            b"PROXY UNKNOWN anything could go here",
        )
        self.assertIsNone(info.source)
        self.assertIsNone(info.destination)

    def test_feedParsing(self) -> None:
        """
        Test that parsing happens when fed a complete line.
        """
        parser = _v1parser.V1Parser()
        info, remaining = parser.feed(b"PROXY TCP4 127.0.0.1 127.0.0.1 ")
        self.assertFalse(info)
        self.assertFalse(remaining)
        info, remaining = parser.feed(b"8080 8888")
        self.assertFalse(info)
        self.assertFalse(remaining)
        info, remaining = parser.feed(b"\r\n")
        self.assertFalse(remaining)
        assert remaining is not None
        assert info is not None
        self.assertIsInstance(info.source, address.IPv4Address)
        assert isinstance(info.source, address.IPv4Address)
        assert isinstance(info.destination, address.IPv4Address)  # type: ignore[unreachable]
        self.assertEqual(info.source.host, "127.0.0.1")
        self.assertEqual(info.source.port, 8080)
        self.assertEqual(info.destination.host, "127.0.0.1")
        self.assertEqual(info.destination.port, 8888)

    def test_feedParsingTooLong(self) -> None:
        """
        Test that parsing fails if no newline is found in 108 bytes.
        """
        parser = _v1parser.V1Parser()
        info, remaining = parser.feed(b"PROXY TCP4 127.0.0.1 127.0.0.1 ")
        self.assertFalse(info)
        self.assertFalse(remaining)
        info, remaining = parser.feed(b"8080 8888")
        self.assertFalse(info)
        self.assertFalse(remaining)
        self.assertRaises(
            InvalidProxyHeader,
            parser.feed,
            b" " * 100,
        )

    def test_feedParsingOverflow(self) -> None:
        """
        Test that parsing leaves overflow bytes in the buffer.
        """
        parser = _v1parser.V1Parser()
        info, remaining = parser.feed(
            b"PROXY TCP4 127.0.0.1 127.0.0.1 8080 8888\r\nHTTP/1.1 GET /\r\n",
        )
        self.assertTrue(info)
        self.assertEqual(remaining, b"HTTP/1.1 GET /\r\n")
        self.assertFalse(parser.buffer)