"""
Unit tests for auth classes.

Integration tests also exist in tests/client/test_auth.py
"""
from urllib.request import parse_keqv_list

import pytest

import httpx


def test_basic_auth():
    auth = httpx.BasicAuth(username="user", password="pass")
    request = httpx.Request("GET", "https://www.example.com")

    # The initial request should include a basic auth header.
    flow = auth.sync_auth_flow(request)
    request = next(flow)
    assert request.headers["Authorization"].startswith("Basic")

    # No other requests are made.
    response = httpx.Response(content=b"Hello, world!", status_code=200)
    with pytest.raises(StopIteration):
        flow.send(response)


def test_digest_auth_with_200():
    auth = httpx.DigestAuth(username="user", password="pass")
    request = httpx.Request("GET", "https://www.example.com")

    # The initial request should not include an auth header.
    flow = auth.sync_auth_flow(request)
    request = next(flow)
    assert "Authorization" not in request.headers

    # If a 200 response is returned, then no other requests are made.
    response = httpx.Response(content=b"Hello, world!", status_code=200)
    with pytest.raises(StopIteration):
        flow.send(response)


def test_digest_auth_with_401():
    auth = httpx.DigestAuth(username="user", password="pass")
    request = httpx.Request("GET", "https://www.example.com")

    # The initial request should not include an auth header.
    flow = auth.sync_auth_flow(request)
    request = next(flow)
    assert "Authorization" not in request.headers

    # If a 401 response is returned, then a digest auth request is made.
    headers = {
        "WWW-Authenticate": 'Digest realm="...", qop="auth", nonce="...", opaque="..."'
    }
    response = httpx.Response(
        content=b"Auth required", status_code=401, headers=headers, request=request
    )
    request = flow.send(response)
    assert request.headers["Authorization"].startswith("Digest")

    # No other requests are made.
    response = httpx.Response(content=b"Hello, world!", status_code=200)
    with pytest.raises(StopIteration):
        flow.send(response)


def test_digest_auth_with_401_nonce_counting():
    auth = httpx.DigestAuth(username="user", password="pass")
    request = httpx.Request("GET", "https://www.example.com")

    # The initial request should not include an auth header.
    flow = auth.sync_auth_flow(request)
    request = next(flow)
    assert "Authorization" not in request.headers

    # If a 401 response is returned, then a digest auth request is made.
    headers = {
        "WWW-Authenticate": 'Digest realm="...", qop="auth", nonce="...", opaque="..."'
    }
    response = httpx.Response(
        content=b"Auth required", status_code=401, headers=headers, request=request
    )
    first_request = flow.send(response)
    assert first_request.headers["Authorization"].startswith("Digest")

    # Each subsequent request contains the digest header by default...
    request = httpx.Request("GET", "https://www.example.com")
    flow = auth.sync_auth_flow(request)
    second_request = next(flow)
    assert second_request.headers["Authorization"].startswith("Digest")

    # ... and the client nonce count (nc) is increased
    first_nc = parse_keqv_list(first_request.headers["Authorization"].split(", "))["nc"]
    second_nc = parse_keqv_list(second_request.headers["Authorization"].split(", "))[
        "nc"
    ]
    assert int(first_nc, 16) + 1 == int(second_nc, 16)

    # No other requests are made.
    response = httpx.Response(content=b"Hello, world!", status_code=200)
    with pytest.raises(StopIteration):
        flow.send(response)


def set_cookies(request: httpx.Request) -> httpx.Response:
    headers = {
        "Set-Cookie": "session=.session_value...",
        "WWW-Authenticate": 'Digest realm="...", qop="auth", nonce="...", opaque="..."',
    }
    if request.url.path == "/auth":
        return httpx.Response(
            content=b"Auth required", status_code=401, headers=headers
        )
    else:
        raise NotImplementedError()  # pragma: no cover


def test_digest_auth_setting_cookie_in_request():
    url = "https://www.example.com/auth"
    client = httpx.Client(transport=httpx.MockTransport(set_cookies))
    request = client.build_request("GET", url)

    auth = httpx.DigestAuth(username="user", password="pass")
    flow = auth.sync_auth_flow(request)
    request = next(flow)
    assert "Authorization" not in request.headers

    response = client.get(url)
    assert len(response.cookies) > 0
    assert response.cookies["session"] == ".session_value..."

    request = flow.send(response)
    assert request.headers["Authorization"].startswith("Digest")
    assert request.headers["Cookie"] == "session=.session_value..."

    # No other requests are made.
    response = httpx.Response(
        content=b"Hello, world!", status_code=200, request=request
    )
    with pytest.raises(StopIteration):
        flow.send(response)