"""Instance settings (registration toggle) and changing your own password."""

from __future__ import annotations

from fastapi.testclient import TestClient
from sqlalchemy import select

from lembas.db.models import Session as SessionRow
from lembas.db.models import User
from lembas.services import settings_store


# --- Registration toggle -----------------------------------------------------
def test_registration_is_open_by_default(client: TestClient, db, registered):
    assert settings_store.signup_allowed(db) is True


def test_closing_registration_blocks_new_accounts(client: TestClient, db, registered):
    client.post("/admin/general", data={"instance_name": "LLeMbas"}, follow_redirects=False)
    assert settings_store.signup_allowed(db) is False

    response = client.post(
        "/auth/register",
        data={"name": "Uninvited", "email": "no@thanks.test", "password": "let-me-in-please"},
        follow_redirects=False,
    )
    assert response.status_code == 403
    assert "Registration is closed" in response.text
    assert db.scalar(select(User).where(User.email == "no@thanks.test")) is None


def test_closed_registration_hides_the_create_account_link(
    client: TestClient, db, registered
):
    client.post("/admin/general", data={"instance_name": "LLeMbas"}, follow_redirects=False)
    client.post("/auth/logout", follow_redirects=False)

    page = client.get("/auth/login")
    assert "/auth/register" not in page.text


def test_open_registration_shows_the_link(client: TestClient, db, registered):
    client.post(
        "/admin/general",
        data={"instance_name": "LLeMbas", "allow_signup": "true"},
        follow_redirects=False,
    )
    client.post("/auth/logout", follow_redirects=False)
    assert "/auth/register" in client.get("/auth/login").text


def test_existing_users_can_still_sign_in_when_registration_is_closed(
    client: TestClient, db, registered
):
    client.post("/admin/general", data={"instance_name": "LLeMbas"}, follow_redirects=False)
    client.post("/auth/logout", follow_redirects=False)

    response = client.post(
        "/auth/login",
        data={"email": registered["email"], "password": registered["password"]},
        follow_redirects=False,
    )
    assert response.status_code == 303


def test_stored_setting_beats_the_environment_default(client: TestClient, db, registered):
    """A toggle that silently reverted on restart would be worse than none."""
    from lembas.config import settings as env_settings

    assert env_settings.allow_signup is True
    settings_store.update(db, {"allow_signup": False})
    assert settings_store.signup_allowed(db) is False


def test_ordinary_users_cannot_change_instance_settings(client: TestClient, db, registered):
    client.post("/auth/logout", follow_redirects=False)
    client.post(
        "/auth/register",
        data={"name": "Sam", "email": "sam@shire.test", "password": "potatoes-po-ta-toes"},
        follow_redirects=False,
    )
    assert client.post("/admin/general", data={"instance_name": "Pwned"}).status_code == 403
    assert settings_store.get(db, "instance_name") == "LLeMbas"


# --- Password change ---------------------------------------------------------
def test_password_change_works(client: TestClient, db, registered):
    response = client.post(
        "/api/preferences/password",
        data={
            "current_password": registered["password"],
            "new_password": "a-much-better-password",
            "confirm_password": "a-much-better-password",
        },
        follow_redirects=False,
    )
    assert response.status_code == 303
    assert "saved=" in response.headers["location"]

    client.post("/auth/logout", follow_redirects=False)
    assert (
        client.post(
            "/auth/login",
            data={"email": registered["email"], "password": "a-much-better-password"},
            follow_redirects=False,
        ).status_code
        == 303
    )


def test_old_password_stops_working(client: TestClient, db, registered):
    client.post(
        "/api/preferences/password",
        data={
            "current_password": registered["password"],
            "new_password": "a-much-better-password",
            "confirm_password": "a-much-better-password",
        },
        follow_redirects=False,
    )
    client.post("/auth/logout", follow_redirects=False)
    assert (
        client.post(
            "/auth/login",
            data={"email": registered["email"], "password": registered["password"]},
            follow_redirects=False,
        ).status_code
        == 401
    )


def test_wrong_current_password_is_refused(client: TestClient, db, registered):
    response = client.post(
        "/api/preferences/password",
        data={
            "current_password": "not-my-password",
            "new_password": "a-much-better-password",
            "confirm_password": "a-much-better-password",
        },
        follow_redirects=False,
    )
    assert "error=" in response.headers["location"]

    user = db.scalar(select(User).where(User.email == registered["email"]))
    db.refresh(user)
    from lembas.security.passwords import verify_password

    assert verify_password(registered["password"], user.password_hash)


def test_mismatched_confirmation_is_refused(client: TestClient, db, registered):
    response = client.post(
        "/api/preferences/password",
        data={
            "current_password": registered["password"],
            "new_password": "a-much-better-password",
            "confirm_password": "a-different-password",
        },
        follow_redirects=False,
    )
    assert "do%20not%20match" in response.headers["location"]


def test_short_new_password_is_refused(client: TestClient, db, registered):
    response = client.post(
        "/api/preferences/password",
        data={
            "current_password": registered["password"],
            "new_password": "short",
            "confirm_password": "short",
        },
        follow_redirects=False,
    )
    assert "8%20characters" in response.headers["location"]


def test_other_sessions_are_revoked_but_this_one_survives(client: TestClient, db, registered):
    """If the reason for changing a password is that someone else knows it,
    leaving their session alive defeats the point."""
    other = TestClient(client.app)
    other.post(
        "/auth/login",
        data={"email": registered["email"], "password": registered["password"]},
        follow_redirects=False,
    )
    assert other.get("/chat", follow_redirects=False).status_code == 200
    assert db.scalar(select(SessionRow)) is not None

    client.post(
        "/api/preferences/password",
        data={
            "current_password": registered["password"],
            "new_password": "a-much-better-password",
            "confirm_password": "a-much-better-password",
        },
        follow_redirects=False,
    )

    # The other browser is out...
    assert other.get("/chat", follow_redirects=False).status_code == 303
    # ...and the tab that made the change is still in.
    assert client.get("/chat", follow_redirects=False).status_code == 200