"""The admin-issued set-password link.

One mechanism answering three things: SEC-15 (a no-SMTP instance auto-verifies every registration, so
a pre-empted address cannot be recovered by mail), SEC-16 (a pre-empted address stays takeable until
its owner resets, and reset needs working mail), and the everyday "no SMTP and someone forgot theirs".

The property that must not regress is the one that makes it honest: an admin-issued link proves
NOTHING about the mailbox — the admin hands it over by whatever means they like — so it must not
confirm the address the way a mailed reset does.
"""

from app.models import AuthToken


def _link(client_admin, user_id: int):
    r = client_admin.post(f"/api/admin/users/{user_id}/set-password-link")
    assert r.status_code == 200, r.text
    return r.json()["url"].split("#reset=", 1)[1]


def test_the_link_sets_a_password_without_confirming_the_address(db, as_user, make_user, client):
    """The whole point of a separate token kind. A mailed reset arrives IN the mailbox, so completing
    it proves ownership and confirms the address. An admin-issued link does not, and claiming
    otherwise would let an admin confirm an address nobody ever proved."""
    admin = make_user(role="admin")
    target = make_user(email_verified=False)
    db.commit()

    token = _link(as_user(admin), target.id)
    r = client.post(
        "/auth/password-reset/confirm", json={"token": token, "password": "a brand new passphrase"}
    )
    assert r.status_code == 200, r.text

    db.refresh(target)
    assert target.password_hash is not None
    assert target.email_verified is False  # the address is still unproven — and says so


def test_a_mailed_reset_still_confirms_the_address(db, as_user, make_user, client):
    """The mutation check for the test above: if `email_verified` were simply never set, this would
    fail — and the rescue path for "registered but never clicked the link" would be gone."""
    from datetime import timedelta

    from app.routes.auth import _issue_token

    user = make_user(email_verified=False)
    db.commit()
    token = _issue_token(db, user, "reset", timedelta(hours=1))

    r = client.post(
        "/auth/password-reset/confirm", json={"token": token, "password": "a brand new passphrase"}
    )
    assert r.status_code == 200, r.text

    db.refresh(user)
    assert user.email_verified is True


def test_using_the_link_evicts_whoever_held_the_old_password(db, as_user, make_user, client):
    """SEC-16's actual remedy: the squatter's session dies the moment the real owner sets a password.
    The epoch bump is what does it, and it is the reason this reuses the reset confirm path rather
    than writing a second one that could forget to bump."""
    target = make_user()
    db.commit()
    before = target.session_epoch

    admin = make_user(role="admin")
    db.commit()
    token = _link(as_user(admin), target.id)
    assert (
        client.post(
            "/auth/password-reset/confirm",
            json={"token": token, "password": "the owner's own choice"},
        ).status_code
        == 200
    )

    db.refresh(target)
    assert target.session_epoch != before


def test_issuing_does_not_touch_the_current_password(db, as_user, make_user):
    """An admin misclick must not lock anyone out. Issuing is an offer; only USING it changes
    anything — which is also why it is safe to offer on a perfectly healthy account."""
    target = make_user()
    db.commit()
    original = target.password_hash

    admin = make_user(role="admin")
    db.commit()
    _link(as_user(admin), target.id)

    db.refresh(target)
    assert target.password_hash == original
    assert target.password_revoked_at is None


def test_the_link_is_single_use(db, as_user, make_user, client):
    target = make_user()
    admin = make_user(role="admin")
    db.commit()

    token = _link(as_user(admin), target.id)
    first = client.post(
        "/auth/password-reset/confirm", json={"token": token, "password": "first passphrase here"}
    )
    second = client.post(
        "/auth/password-reset/confirm", json={"token": token, "password": "second passphrase here"}
    )
    assert first.status_code == 200
    assert second.status_code == 400


def test_a_new_link_burns_the_outstanding_ones(db, as_user, make_user, client):
    """Spending any password token burns the siblings of BOTH kinds. Without that, a spent reset
    would leave a live admin link behind — a second key to a door someone just changed the lock on."""
    target = make_user()
    admin = make_user(role="admin")
    db.commit()

    first = _link(as_user(admin), target.id)
    second = _link(as_user(admin), target.id)

    ok = client.post(
        "/auth/password-reset/confirm", json={"token": second, "password": "the newer passphrase"}
    )
    assert ok.status_code == 200
    stale = client.post(
        "/auth/password-reset/confirm", json={"token": first, "password": "the older passphrase"}
    )
    assert stale.status_code == 400


def test_the_probe_recognises_an_admin_link(db, as_user, make_user, client):
    """`/auth/password-reset/check` is what stops the card drawing a form for a dead link. It peeked
    only at `reset` tokens, so without teaching it the new kind every admin-issued link would open
    onto "this link is spent"."""
    target = make_user()
    admin = make_user(role="admin")
    db.commit()

    token = _link(as_user(admin), target.id)
    r = client.post("/auth/password-reset/check", json={"token": token})
    assert r.json() == {"ok": True}


def test_only_an_admin_can_mint_one(db, as_user, make_user):
    plain = make_user()
    victim = make_user()
    db.commit()

    r = as_user(plain).post(f"/api/admin/users/{victim.id}/set-password-link")
    assert r.status_code in (401, 403)
    assert db.query(AuthToken).filter(AuthToken.kind == "setpw").count() == 0


def test_the_access_panel_reports_the_gates(db, as_user, make_user):
    admin = make_user(role="admin")
    target = make_user(email_verified=False, is_active=False)
    db.commit()

    body = as_user(admin).get(f"/api/admin/users/{target.id}/access").json()
    assert body["email_verified"] is False
    assert body["is_active"] is False
    assert set(body) >= {
        "is_allowed",
        "can_activate",
        "email_configured",
        "password_revoked_at",
        "google_email",
        "has_password",
        "has_google",
    }


def test_the_panel_names_a_google_address_only_when_it_differs(db, as_user, make_user):
    """ "Connected" and "connected as someone else" are different statements, and only the second one
    explains a confusing sign-in. Repeating the account's own address would be noise on every row."""
    admin = make_user(role="admin")
    same = make_user(email="same@example.com")
    same.google_email = "same@example.com"
    other = make_user(email="typed@example.com")
    other.google_email = "google-primary@example.com"
    db.commit()

    c = as_user(admin)
    assert c.get(f"/api/admin/users/{same.id}/access").json()["google_email"] is None
    assert (
        c.get(f"/api/admin/users/{other.id}/access").json()["google_email"]
        == "google-primary@example.com"
    )


def test_the_link_is_audited_without_recording_the_link(db, as_user, make_user):
    """The audit log is read by humans and kept long; a live credential-setting link is the last
    thing that belongs in it. That one was ISSUED, by whom, for whom, is the auditable fact."""
    from app.models import AuditLog

    admin = make_user(role="admin")
    target = make_user()
    db.commit()

    url = as_user(admin).post(f"/api/admin/users/{target.id}/set-password-link").json()["url"]
    secret = url.split("#reset=", 1)[1]

    rows = db.query(AuditLog).filter(AuditLog.action == "user_setpw_link").all()
    assert len(rows) == 1
    assert rows[0].summary == target.email
    assert secret not in str(rows[0].summary) + str(rows[0].before) + str(rows[0].after)


def test_a_google_only_account_can_be_given_a_password(db, as_user, make_user, client):
    """Deliberately not gated on the account's state: the admin's real case is whichever one it is,
    and narrowing this would only make it refuse exactly then."""
    admin = make_user(role="admin")
    google_only = make_user(password=None)
    db.commit()
    assert google_only.password_hash is None

    token = _link(as_user(admin), google_only.id)
    r = client.post(
        "/auth/password-reset/confirm", json={"token": token, "password": "now it has one too"}
    )
    assert r.status_code == 200
    db.refresh(google_only)
    assert google_only.password_hash is not None


def test_an_unknown_user_is_a_404(db, as_user, make_user):
    admin = make_user(role="admin")
    db.commit()
    assert as_user(admin).post("/api/admin/users/999999/set-password-link").status_code == 404
    assert as_user(admin).get("/api/admin/users/999999/access").status_code == 404


def test_the_issued_token_is_stored_hashed(db, as_user, make_user):
    """Same rule as every other token here: the DB holds a hash, so a database read cannot hand
    someone a working link."""
    admin = make_user(role="admin")
    target = make_user()
    db.commit()

    raw = _link(as_user(admin), target.id)
    rows = db.query(AuthToken).filter(AuthToken.kind == "setpw").all()
    assert len(rows) == 1
    assert rows[0].token_hash != raw
    assert raw not in rows[0].token_hash


def test_the_link_outlives_the_one_hour_reset_window(db, as_user, make_user):
    """It travels out of band — the admin has to actually reach the person — so the mailed reset's
    one hour is far too short."""
    from datetime import datetime, timedelta, timezone

    admin = make_user(role="admin")
    target = make_user()
    db.commit()

    _link(as_user(admin), target.id)
    row = db.query(AuthToken).filter(AuthToken.kind == "setpw").one()
    assert row.expires_at - datetime.now(timezone.utc) > timedelta(hours=2)


def test_users_listing_still_serializes(db, as_user, make_user):
    """The list gained two fields; this pins that it did not gain the two per-row QUERIES the panel
    endpoint exists to keep out of it."""
    admin = make_user(role="admin")
    db.commit()
    rows = as_user(admin).get("/api/admin/users").json()
    assert rows and "password_revoked_at" in rows[0] and "google_email" in rows[0]
    assert "can_activate" not in rows[0]