from wsgiref.validate import validator

import pytest

from paste import options

from ..common_wsgi import call_app


@pytest.fixture
def app():
    @validator
    @options
    @validator
    def app(_, start_response):
        start_response("200 OK", [("Content-Type", "text/plain")])
        return [b"Hello, world!"]

    return app


@pytest.mark.parametrize("method", ["GET", "HEAD", "POST", "PUT", "DELETE"])
def test_non_options(app, method):
    environ = {"REQUEST_METHOD": method}
    response = call_app(app, environ)
    assert response.data == b"Hello, world!"
    assert response.status == "200 OK"
    assert ("Content-Type", "text/plain") in response.headers


def test_options(app):
    environ = {"REQUEST_METHOD": "OPTIONS"}
    response = call_app(app, environ)
    assert response.data == b""
    assert response.status == "204 No Content"
    allow = None
    for k, v in response.headers:
        if k != "Allow":
            continue
        allow = v.split(", ")
    assert allow is not None, "Must contain an Allow header"
    assert len(set(allow)) == len(allow), "Allow header must not contain duplicates"
    assert set(allow) == {"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS"}