from unittest.mock import MagicMock

import django
import pytest
from django.conf.urls import url
from django.core.exceptions import ImproperlyConfigured

from channels.http import AsgiHandler
from channels.routing import ChannelNameRouter, ProtocolTypeRouter, URLRouter


def test_protocol_type_router():
    """
    Tests the ProtocolTypeRouter
    """
    # Test basic operation
    router = ProtocolTypeRouter(
        {
            "websocket": MagicMock(return_value="ws"),
            "http": MagicMock(return_value="http"),
        }
    )
    assert router({"type": "websocket"}) == "ws"
    assert router({"type": "http"}) == "http"
    # Test defaulting to AsgiHandler
    router = ProtocolTypeRouter({"websocket": MagicMock(return_value="ws")})
    assert isinstance(router({"type": "http"}), AsgiHandler)
    # Test an unmatched type
    with pytest.raises(ValueError):
        router({"type": "aprs"})
    # Test a scope with no type
    with pytest.raises(KeyError):
        router({"tyyyype": "http"})


def test_channel_name_router():
    """
    Tests the ChannelNameRouter
    """
    # Test basic operation
    router = ChannelNameRouter(
        {"test": MagicMock(return_value=1), "other_test": MagicMock(return_value=2)}
    )
    assert router({"channel": "test"}) == 1
    assert router({"channel": "other_test"}) == 2
    # Test an unmatched channel
    with pytest.raises(ValueError):
        router({"channel": "chat"})
    # Test a scope with no channel
    with pytest.raises(ValueError):
        router({"type": "http"})


def test_url_router():
    """
    Tests the URLRouter
    """
    posarg_app = MagicMock(return_value=4)
    kwarg_app = MagicMock(return_value=5)
    defaultkwarg_app = MagicMock(return_value=6)
    router = URLRouter(
        [
            url(r"^$", MagicMock(return_value=1)),
            url(r"^foo/$", MagicMock(return_value=2)),
            url(r"^bar", MagicMock(return_value=3)),
            url(r"^posarg/(\d+)/$", posarg_app),
            url(r"^kwarg/(?P<name>\w+)/$", kwarg_app),
            url(r"^defaultkwargs/$", defaultkwarg_app, kwargs={"default": 42}),
        ]
    )
    # Valid basic matches
    assert router({"type": "http", "path": "/"}) == 1
    assert router({"type": "http", "path": "/foo/"}) == 2
    assert router({"type": "http", "path": "/bar/"}) == 3
    assert router({"type": "http", "path": "/bar/baz/"}) == 3
    # Valid positional matches
    assert router({"type": "http", "path": "/posarg/123/"}) == 4
    assert posarg_app.call_args[0][0]["url_route"] == {"args": ("123",), "kwargs": {}}
    assert router({"type": "http", "path": "/posarg/456/"}) == 4
    assert posarg_app.call_args[0][0]["url_route"] == {"args": ("456",), "kwargs": {}}
    # Valid keyword argument matches
    assert router({"type": "http", "path": "/kwarg/hello/"}) == 5
    assert kwarg_app.call_args[0][0]["url_route"] == {
        "args": tuple(),
        "kwargs": {"name": "hello"},
    }
    assert router({"type": "http", "path": "/kwarg/hellothere/"}) == 5
    assert kwarg_app.call_args[0][0]["url_route"] == {
        "args": tuple(),
        "kwargs": {"name": "hellothere"},
    }
    # Valid default keyword arguments
    assert router({"type": "http", "path": "/defaultkwargs/"}) == 6
    assert defaultkwarg_app.call_args[0][0]["url_route"] == {
        "args": tuple(),
        "kwargs": {"default": 42},
    }

    # Invalid matches
    with pytest.raises(ValueError):
        router({"type": "http", "path": "/nonexistent/"})


def test_url_router_nesting():
    """
    Tests that nested URLRouters add their keyword captures together.
    """
    test_app = MagicMock(return_value=1)
    inner_router = URLRouter(
        [
            url(r"^book/(?P<book>[\w\-]+)/page/(?P<page>\d+)/$", test_app),
            url(r"^test/(\d+)/$", test_app),
        ]
    )
    outer_router = URLRouter(
        [
            url(r"^universe/(?P<universe>\d+)/author/(?P<author>\w+)/", inner_router),
            url(r"^positional/(\w+)/", inner_router),
        ]
    )
    assert (
        outer_router(
            {
                "type": "http",
                "path": "/universe/42/author/andrewgodwin/book/channels-guide/page/10/",
            }
        )
        == 1
    )
    assert test_app.call_args[0][0]["url_route"] == {
        "args": (),
        "kwargs": {
            "book": "channels-guide",
            "author": "andrewgodwin",
            "page": "10",
            "universe": "42",
        },
    }

    assert outer_router({"type": "http", "path": "/positional/foo/test/3/"}) == 1
    assert test_app.call_args[0][0]["url_route"] == {"args": ("foo", "3"), "kwargs": {}}


@pytest.mark.skipif(django.VERSION[0] < 2, reason="Needs Django 2.x")
def test_url_router_nesting_path():
    """
    Tests that nested URLRouters add their keyword captures together when used
    with path().
    """
    from django.urls import path

    test_app = MagicMock(return_value=1)
    inner_router = URLRouter([path("test/<int:page>/", test_app)])

    def asgi_middleware(inner):
        # Some middleware which hides the fact that we have an inner URLRouter
        def app(scope):
            return inner(scope)

        app._path_routing = True
        return app

    outer_router = URLRouter(
        [path("number/<int:number>/", asgi_middleware(inner_router))]
    )

    assert inner_router({"type": "http", "path": "/test/3/"}) == 1
    assert outer_router({"type": "http", "path": "/number/42/test/3/"}) == 1
    assert test_app.call_args[0][0]["url_route"] == {
        "args": (),
        "kwargs": {"number": 42, "page": 3},
    }
    with pytest.raises(ValueError):
        assert outer_router({"type": "http", "path": "/number/42/test/3/bla/"})
    with pytest.raises(ValueError):
        assert outer_router({"type": "http", "path": "/number/42/blub/"})


@pytest.mark.skipif(django.VERSION[0] < 2, reason="Needs Django 2.x")
def test_url_router_path():
    """
    Tests that URLRouter also works with path()
    """
    from django.urls import path

    kwarg_app = MagicMock(return_value=3)
    router = URLRouter(
        [
            path("", MagicMock(return_value=1)),
            path("foo/", MagicMock(return_value=2)),
            path("author/<name>/", kwarg_app),
            path("year/<int:year>/", kwarg_app),
        ]
    )
    # Valid basic matches
    assert router({"type": "http", "path": "/"}) == 1
    assert router({"type": "http", "path": "/foo/"}) == 2
    # Named without typecasting
    assert router({"type": "http", "path": "/author/andrewgodwin/"}) == 3
    assert kwarg_app.call_args[0][0]["url_route"] == {
        "args": tuple(),
        "kwargs": {"name": "andrewgodwin"},
    }
    # Named with typecasting
    assert router({"type": "http", "path": "/year/2012/"}) == 3
    assert kwarg_app.call_args[0][0]["url_route"] == {
        "args": tuple(),
        "kwargs": {"year": 2012},
    }
    # Invalid matches
    with pytest.raises(ValueError):
        router({"type": "http", "path": "/nonexistent/"})


# @pytest.mark.xfail
def test_path_remaining():
    """
    Resolving continues in outer router if an inner router has no matching
    routes
    """
    inner_router = URLRouter([url(r"^no-match/$", MagicMock(return_value=1))])
    test_app = MagicMock(return_value=2)
    outer_router = URLRouter(
        [url(r"^prefix/", inner_router), url(r"^prefix/stuff/$", test_app)]
    )
    outermost_router = URLRouter([url(r"", outer_router)])

    assert outermost_router({"type": "http", "path": "/prefix/stuff/"}) == 2


def test_invalid_routes():
    """
    Test URLRouter route validation
    """
    try:
        from django.urls import include
    except ImportError:  # Django 1.11
        from django.conf.urls import include

    with pytest.raises(ImproperlyConfigured) as exc:
        URLRouter([url(r"^$", include([]))])

    assert "include() is not supported in URLRouter." in str(exc)