import warnings

import pytest

import flask
from flask.sessions import SecureCookieSessionInterface
from flask.sessions import SessionInterface

try:
    from greenlet import greenlet
except ImportError:
    greenlet = None


def test_teardown_on_pop(app):
    buffer = []

    @app.teardown_request
    def end_of_request(exception):
        buffer.append(exception)

    ctx = app.test_request_context()
    ctx.push()
    assert buffer == []
    ctx.pop()
    assert buffer == [None]


def test_teardown_with_previous_exception(app):
    buffer = []

    @app.teardown_request
    def end_of_request(exception):
        buffer.append(exception)

    try:
        raise Exception("dummy")
    except Exception:
        pass

    with app.test_request_context():
        assert buffer == []
    assert buffer == [None]


def test_teardown_with_handled_exception(app):
    buffer = []

    @app.teardown_request
    def end_of_request(exception):
        buffer.append(exception)

    with app.test_request_context():
        assert buffer == []
        try:
            raise Exception("dummy")
        except Exception:
            pass
    assert buffer == [None]


def test_proper_test_request_context(app):
    app.config.update(SERVER_NAME="localhost.localdomain:5000")

    @app.route("/")
    def index():
        return None

    @app.route("/", subdomain="foo")
    def sub():
        return None

    with app.test_request_context("/"):
        assert (
            flask.url_for("index", _external=True)
            == "http://localhost.localdomain:5000/"
        )

    with app.test_request_context("/"):
        assert (
            flask.url_for("sub", _external=True)
            == "http://foo.localhost.localdomain:5000/"
        )

    # suppress Werkzeug 0.15 warning about name mismatch
    with warnings.catch_warnings():
        warnings.filterwarnings(
            "ignore", "Current server name", UserWarning, "flask.app"
        )
        with app.test_request_context(
            "/", environ_overrides={"HTTP_HOST": "localhost"}
        ):
            pass

    app.config.update(SERVER_NAME="localhost")
    with app.test_request_context("/", environ_overrides={"SERVER_NAME": "localhost"}):
        pass

    app.config.update(SERVER_NAME="localhost:80")
    with app.test_request_context(
        "/", environ_overrides={"SERVER_NAME": "localhost:80"}
    ):
        pass


def test_context_binding(app):
    @app.route("/")
    def index():
        return f"Hello {flask.request.args['name']}!"

    @app.route("/meh")
    def meh():
        return flask.request.url

    with app.test_request_context("/?name=World"):
        assert index() == "Hello World!"
    with app.test_request_context("/meh"):
        assert meh() == "http://localhost/meh"
    assert flask._request_ctx_stack.top is None


def test_context_test(app):
    assert not flask.request
    assert not flask.has_request_context()
    ctx = app.test_request_context()
    ctx.push()
    try:
        assert flask.request
        assert flask.has_request_context()
    finally:
        ctx.pop()


def test_manual_context_binding(app):
    @app.route("/")
    def index():
        return f"Hello {flask.request.args['name']}!"

    ctx = app.test_request_context("/?name=World")
    ctx.push()
    assert index() == "Hello World!"
    ctx.pop()
    with pytest.raises(RuntimeError):
        index()


@pytest.mark.skipif(greenlet is None, reason="greenlet not installed")
class TestGreenletContextCopying:
    def test_greenlet_context_copying(self, app, client):
        greenlets = []

        @app.route("/")
        def index():
            flask.session["fizz"] = "buzz"
            reqctx = flask._request_ctx_stack.top.copy()

            def g():
                assert not flask.request
                assert not flask.current_app
                with reqctx:
                    assert flask.request
                    assert flask.current_app == app
                    assert flask.request.path == "/"
                    assert flask.request.args["foo"] == "bar"
                    assert flask.session.get("fizz") == "buzz"
                assert not flask.request
                return 42

            greenlets.append(greenlet(g))
            return "Hello World!"

        rv = client.get("/?foo=bar")
        assert rv.data == b"Hello World!"

        result = greenlets[0].run()
        assert result == 42

    def test_greenlet_context_copying_api(self, app, client):
        greenlets = []

        @app.route("/")
        def index():
            flask.session["fizz"] = "buzz"

            @flask.copy_current_request_context
            def g():
                assert flask.request
                assert flask.current_app == app
                assert flask.request.path == "/"
                assert flask.request.args["foo"] == "bar"
                assert flask.session.get("fizz") == "buzz"
                return 42

            greenlets.append(greenlet(g))
            return "Hello World!"

        rv = client.get("/?foo=bar")
        assert rv.data == b"Hello World!"

        result = greenlets[0].run()
        assert result == 42


def test_session_error_pops_context():
    class SessionError(Exception):
        pass

    class FailingSessionInterface(SessionInterface):
        def open_session(self, app, request):
            raise SessionError()

    class CustomFlask(flask.Flask):
        session_interface = FailingSessionInterface()

    app = CustomFlask(__name__)

    @app.route("/")
    def index():
        # shouldn't get here
        AssertionError()

    response = app.test_client().get("/")
    assert response.status_code == 500
    assert not flask.request
    assert not flask.current_app


def test_session_dynamic_cookie_name():

    # This session interface will use a cookie with a different name if the
    # requested url ends with the string "dynamic_cookie"
    class PathAwareSessionInterface(SecureCookieSessionInterface):
        def get_cookie_name(self, app):
            if flask.request.url.endswith("dynamic_cookie"):
                return "dynamic_cookie_name"
            else:
                return super().get_cookie_name(app)

    class CustomFlask(flask.Flask):
        session_interface = PathAwareSessionInterface()

    app = CustomFlask(__name__)
    app.secret_key = "secret_key"

    @app.route("/set", methods=["POST"])
    def set():
        flask.session["value"] = flask.request.form["value"]
        return "value set"

    @app.route("/get")
    def get():
        v = flask.session.get("value", "None")
        return v

    @app.route("/set_dynamic_cookie", methods=["POST"])
    def set_dynamic_cookie():
        flask.session["value"] = flask.request.form["value"]
        return "value set"

    @app.route("/get_dynamic_cookie")
    def get_dynamic_cookie():
        v = flask.session.get("value", "None")
        return v

    test_client = app.test_client()

    # first set the cookie in both /set urls but each with a different value
    assert test_client.post("/set", data={"value": "42"}).data == b"value set"
    assert (
        test_client.post("/set_dynamic_cookie", data={"value": "616"}).data
        == b"value set"
    )

    # now check that the relevant values come back - meaning that different
    # cookies are being used for the urls that end with "dynamic cookie"
    assert test_client.get("/get").data == b"42"
    assert test_client.get("/get_dynamic_cookie").data == b"616"


def test_bad_environ_raises_bad_request():
    app = flask.Flask(__name__)

    from flask.testing import EnvironBuilder

    builder = EnvironBuilder(app)
    environ = builder.get_environ()

    # use a non-printable character in the Host - this is key to this test
    environ["HTTP_HOST"] = "\x8a"

    with app.request_context(environ):
        response = app.full_dispatch_request()
    assert response.status_code == 400


def test_environ_for_valid_idna_completes():
    app = flask.Flask(__name__)

    @app.route("/")
    def index():
        return "Hello World!"

    from flask.testing import EnvironBuilder

    builder = EnvironBuilder(app)
    environ = builder.get_environ()

    # these characters are all IDNA-compatible
    environ["HTTP_HOST"] = "ąśźäüжŠßя.com"

    with app.request_context(environ):
        response = app.full_dispatch_request()

    assert response.status_code == 200


def test_normal_environ_completes():
    app = flask.Flask(__name__)

    @app.route("/")
    def index():
        return "Hello World!"

    response = app.test_client().get("/", headers={"host": "xn--on-0ia.com"})
    assert response.status_code == 200