from __future__ import annotations

import sys
from http.cookies import SimpleCookie
from pathlib import Path

import pytest
from starlette.testclient import TestClient

ROOT_DIR = Path(__file__).resolve().parents[1]
if str(ROOT_DIR) not in sys.path:
    sys.path.insert(0, str(ROOT_DIR))

from dashboard import authentication
from dashboard.auth_server import create_auth_routes


ADMIN_ID = "admin"
ADMIN_PASSWORD = "correct horse battery staple"
SIGNING_SECRET = "s" * 64


@pytest.fixture(autouse=True)
def _configured_auth(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv(authentication.ADMIN_ID_ENV, ADMIN_ID)
    monkeypatch.setenv(authentication.ADMIN_PASSWORD_ENV, ADMIN_PASSWORD)
    monkeypatch.setenv(authentication.SIGNING_SECRET_ENV, SIGNING_SECRET)
    monkeypatch.setattr(authentication.time, "sleep", lambda _seconds: None)


@pytest.fixture
def client() -> TestClient:
    from starlette.applications import Starlette

    return TestClient(
        Starlette(routes=create_auth_routes()), base_url="https://testserver"
    )


def _cookie_from(response) -> SimpleCookie[str]:
    cookie: SimpleCookie[str] = SimpleCookie()
    cookie.load(response.headers["set-cookie"])
    return cookie


def test_successful_login_sets_hardened_24_hour_cookie(client: TestClient) -> None:
    response = client.post(
        "/api/auth/login",
        data={"admin_id": ADMIN_ID, "admin_password": ADMIN_PASSWORD},
        headers={"origin": "https://testserver"},
        follow_redirects=False,
    )

    assert response.status_code == 303
    assert response.headers["location"] == "/"
    header = response.headers["set-cookie"]
    assert f"{authentication.AUTH_COOKIE_NAME}=" in header
    assert "HttpOnly" in header
    assert "Secure" in header
    assert "SameSite=lax" in header
    assert "Path=/" in header
    assert f"Max-Age={authentication.DEFAULT_TOKEN_TTL_SECONDS}" in header
    assert ADMIN_PASSWORD not in header
    assert SIGNING_SECRET not in header


def test_remember_me_sets_30_day_cookie(client: TestClient) -> None:
    response = client.post(
        "/api/auth/login",
        data={
            "admin_id": ADMIN_ID,
            "admin_password": ADMIN_PASSWORD,
            "remember_me": "on",
        },
        headers={"origin": "https://testserver"},
        follow_redirects=False,
    )

    assert response.status_code == 303
    assert (
        f"Max-Age={authentication.REMEMBER_ME_TOKEN_TTL_SECONDS}"
        in response.headers["set-cookie"]
    )


def test_invalid_credentials_do_not_set_cookie_and_use_general_error(
    client: TestClient,
) -> None:
    response = client.post(
        "/api/auth/login",
        data={"admin_id": ADMIN_ID, "admin_password": "wrong"},
        headers={"origin": "https://testserver"},
        follow_redirects=False,
    )

    assert response.status_code == 303
    assert response.headers["location"] == "/?auth_error=invalid"
    assert "set-cookie" not in response.headers
    assert "password" not in response.headers["location"]
    assert ADMIN_ID not in response.headers["location"]


def test_missing_configuration_fails_closed(client: TestClient, monkeypatch) -> None:
    monkeypatch.delenv(authentication.SIGNING_SECRET_ENV)

    response = client.post(
        "/api/auth/login",
        data={"admin_id": ADMIN_ID, "admin_password": ADMIN_PASSWORD},
        headers={"origin": "https://testserver"},
        follow_redirects=False,
    )

    assert response.status_code == 303
    assert response.headers["location"] == "/?auth_error=unavailable"
    assert "set-cookie" not in response.headers


def test_cross_site_login_is_rejected(client: TestClient) -> None:
    response = client.post(
        "/api/auth/login",
        data={"admin_id": ADMIN_ID, "admin_password": ADMIN_PASSWORD},
        headers={"origin": "https://attacker.example"},
        follow_redirects=False,
    )

    assert response.status_code == 403
    assert "set-cookie" not in response.headers


def test_different_port_is_not_same_origin(client: TestClient) -> None:
    response = client.post(
        "/api/auth/login",
        data={"admin_id": ADMIN_ID, "admin_password": ADMIN_PASSWORD},
        headers={"origin": "https://testserver:444"},
        follow_redirects=False,
    )

    assert response.status_code == 403
    assert "set-cookie" not in response.headers


def test_plain_http_is_rejected_even_with_spoofed_https_origin() -> None:
    from starlette.applications import Starlette

    with TestClient(
        Starlette(routes=create_auth_routes()), base_url="http://testserver"
    ) as http_client:
        response = http_client.post(
            "/api/auth/login",
            data={"admin_id": ADMIN_ID, "admin_password": ADMIN_PASSWORD},
            headers={
                "origin": "https://testserver",
                "x-forwarded-proto": "https",
            },
            follow_redirects=False,
        )

    assert response.status_code == 403
    assert "set-cookie" not in response.headers


def test_logout_clears_cookie_with_matching_scope(client: TestClient) -> None:
    response = client.post(
        "/api/auth/logout",
        headers={"origin": "https://testserver"},
        follow_redirects=False,
    )

    assert response.status_code == 303
    header = response.headers["set-cookie"]
    assert f"{authentication.AUTH_COOKIE_NAME}=" in header
    assert "Max-Age=0" in header
    assert "HttpOnly" in header
    assert "Secure" in header
    assert "SameSite=lax" in header
    assert "Path=/" in header


def test_cookie_token_round_trip(client: TestClient) -> None:
    response = client.post(
        "/api/auth/login",
        data={"admin_id": ADMIN_ID, "admin_password": ADMIN_PASSWORD},
        headers={"origin": "https://testserver"},
        follow_redirects=False,
    )
    cookie = _cookie_from(response)
    token = cookie[authentication.AUTH_COOKIE_NAME].value

    assert authentication.verify_persistent_token(
        authentication.load_auth_settings(), token
    ) is not None