"""End-to-end behavioural tests for the dashboard auth gate.

Uses ``StubAuthProvider`` so the OAuth round trip can complete in-process
without any external IDP.  Exercises:

  * `/api/status` flips from public (loopback) to gated (auth_required)
  * `/` redirects to /login when no cookie present
  * `/api/auth/providers` is the public bootstrap endpoint
  * `/login` renders HTML listing all providers
  * /assets/* still passes through unauthenticated
  * Full /auth/login → /auth/callback → / round trip with the stub
  * Invalid / missing cookies return 401 (api) or 302 (html)
  * Zero-providers + gate-on fails closed
"""
from __future__ import annotations

import pytest

# Phase 5 / Phase 6: these tests mutate ``web_server.app.state.auth_required``
# at module level. Run them in the same xdist worker so they don't race
# against each other (and against any other file that also touches
# ``app.state``) — the marker name is shared across all dashboard-auth test
# files that gate the app.
pytestmark = pytest.mark.xdist_group("dashboard_auth_app_state")
from fastapi.testclient import TestClient

from hermes_cli import web_server
from hermes_cli.dashboard_auth import clear_providers, register_provider
from hermes_cli.dashboard_auth.cookies import SESSION_AT_COOKIE
from tests.hermes_cli.conftest_dashboard_auth import StubAuthProvider


@pytest.fixture
def gated_app():
    """Configure web_server.app for gated mode + register the stub provider."""
    clear_providers()
    register_provider(StubAuthProvider())
    prev_host = getattr(web_server.app.state, "bound_host", None)
    prev_port = getattr(web_server.app.state, "bound_port", None)
    prev_required = getattr(web_server.app.state, "auth_required", None)
    web_server.app.state.bound_host = "fly-app.fly.dev"
    web_server.app.state.bound_port = 443
    web_server.app.state.auth_required = True
    # Use https base_url so cookies pick up Secure flag and host_header
    # matches the bound interface.
    client = TestClient(web_server.app, base_url="https://fly-app.fly.dev")
    yield client
    clear_providers()
    web_server.app.state.bound_host = prev_host
    web_server.app.state.bound_port = prev_port
    web_server.app.state.auth_required = prev_required


# ---------------------------------------------------------------------------
# Allowlist (public) routes
# ---------------------------------------------------------------------------


def test_gated_status_is_public(gated_app):
    """``/api/status`` MUST be public under the OAuth gate.

    Regression guard for the wildcard-subdomain rollout: NAS
    (``fly-provider.ts`` ``getInstanceRuntimeStatus``) hits
    ``/api/status`` without a cookie as its sole liveness probe. A 401
    here surfaces every healthy agent as STARTING/down in the portal
    UI. The endpoint returns only version + gateway/auth-gate metadata
    (no user data, no session content), so it stays in the shared
    ``PUBLIC_API_PATHS`` allowlist under both the legacy ``_SESSION_TOKEN``
    gate and the OAuth gate.

    The body also reports the gate's shape (``auth_required``,
    ``auth_providers``) so the SPA's StatusPage and external monitors
    can distinguish loopback / gated / no-providers without a separate
    round trip.
    """
    r = gated_app.get("/api/status")
    assert r.status_code == 200, (
        f"Expected 200, got {r.status_code}: {r.text}"
    )
    body = r.json()
    assert body["auth_required"] is True
    assert "version" in body
    assert "gateway_state" in body


@pytest.mark.parametrize("path", [
    "/api/config/defaults",
    "/api/config/schema",
    "/api/model/info",
    "/api/dashboard/themes",
    "/api/dashboard/plugins",
])
def test_other_public_api_paths_are_public_under_gate(gated_app, path):
    """The remaining ``PUBLIC_API_PATHS`` entries must also bypass the
    gate. They're documented as non-sensitive read-only endpoints that
    the SPA pre-loads before login (themes, config schema, model
    metadata). A 401 / 302-to-login here would block the dashboard
    shell from rendering pre-auth.

    Accept any non-auth-failure status: 200 when the route succeeds,
    or any route-specific error (e.g. 400 / 404 / 500 from a missing
    dependency) — but NEVER 401, and NEVER a 302 to ``/login``.
    """
    r = gated_app.get(path, follow_redirects=False)
    assert r.status_code != 401, (
        f"{path} returned 401 under the OAuth gate — should be public"
    )
    if r.status_code == 302:
        location = r.headers.get("location", "")
        assert "/login" not in location, (
            f"{path} redirected to {location} — should be public, "
            "not bounced to /login"
        )


def test_gated_html_redirects_to_login(gated_app):
    r = gated_app.get("/", follow_redirects=False)
    assert r.status_code == 302
    # Phase 6: gate carries a ``next=`` so post-login bounces back to /.
    assert r.headers["location"] in ("/login", "/login?next=%2F")


def test_gated_auth_providers_is_public(gated_app):
    r = gated_app.get("/api/auth/providers")
    assert r.status_code == 200
    body = r.json()
    assert any(p["name"] == "stub" for p in body["providers"])
    assert body["providers"][0]["display_name"] == "Stub IdP (test only)"


def test_gated_login_html_is_public_and_lists_providers(gated_app):
    r = gated_app.get("/login")
    assert r.status_code == 200
    assert r.headers["content-type"].startswith("text/html")
    assert "Stub IdP" in r.text
    assert 'href="/auth/login?provider=stub"' in r.text


def test_gated_static_asset_path_is_public(gated_app):
    """``/assets/*`` is allowlisted so the SPA's CSS/JS loads pre-login."""
    r = gated_app.get("/assets/_nonexistent.css")
    # 404 not 401 — proves middleware let the request through to the
    # static-files mount, which then 404'd because the file isn't there.
    assert r.status_code == 404


# ---------------------------------------------------------------------------
# OAuth round trip
# ---------------------------------------------------------------------------


def test_full_login_round_trip_unlocks_gated_api(gated_app):
    # 1) Click "Sign in with Stub IdP" — /auth/login redirects to the stub
    #    with a PKCE cookie on the response.
    r1 = gated_app.get("/auth/login?provider=stub", follow_redirects=False)
    assert r1.status_code == 302
    pkce = next(
        (c for c in r1.headers.get_list("set-cookie")
         if "hermes_session_pkce" in c),
        None,
    )
    assert pkce and "HttpOnly" in pkce

    redirect = r1.headers["location"]
    # Stub bounces back to {redirect_uri}?code=stub_code&state=<s>
    assert "code=stub_code" in redirect
    assert "state=" in redirect
    state = redirect.split("state=")[1]

    # 2) The browser would now follow the redirect to /auth/callback.
    #    TestClient automatically carries the PKCE cookie forward.
    r2 = gated_app.get(
        f"/auth/callback?code=stub_code&state={state}",
        follow_redirects=False,
    )
    assert r2.status_code == 302
    assert r2.headers["location"] == "/"
    set_cookies = r2.headers.get_list("set-cookie")
    assert any("hermes_session_at" in c for c in set_cookies)
    assert any("hermes_session_rt" in c for c in set_cookies)

    # 3) A gated API route (``/api/sessions``) now succeeds because we
    #    have a valid session cookie. (We deliberately don't probe
    #    ``/api/status`` here — it's in the shared PUBLIC_API_PATHS
    #    allowlist and would 200 even without a login, so it can't
    #    distinguish "logged in" from "gate accidentally disabled".)
    r3 = gated_app.get("/api/sessions")
    assert r3.status_code == 200, (
        f"Expected 200 for /api/sessions post-login, got {r3.status_code}: "
        f"{r3.text}"
    )


def test_login_unknown_provider_returns_404(gated_app):
    r = gated_app.get("/auth/login?provider=nonexistent", follow_redirects=False)
    assert r.status_code == 404


def test_callback_without_pkce_cookie_returns_400(gated_app):
    # No prior /auth/login → no PKCE cookie.
    r = gated_app.get(
        "/auth/callback?code=stub_code&state=anything",
        follow_redirects=False,
    )
    assert r.status_code == 400


def test_callback_state_mismatch_returns_400(gated_app):
    # Walk through /auth/login first to plant the PKCE cookie.
    r1 = gated_app.get("/auth/login?provider=stub", follow_redirects=False)
    # ...then pretend the IDP returned a different state.
    r2 = gated_app.get(
        "/auth/callback?code=stub_code&state=WRONG",
        follow_redirects=False,
    )
    assert r2.status_code == 400


def test_callback_invalid_code_returns_400(gated_app):
    r1 = gated_app.get("/auth/login?provider=stub", follow_redirects=False)
    state = r1.headers["location"].split("state=")[1]
    r2 = gated_app.get(
        f"/auth/callback?code=BAD_CODE&state={state}",
        follow_redirects=False,
    )
    assert r2.status_code == 400


# ---------------------------------------------------------------------------
# Cookie validation
# ---------------------------------------------------------------------------


def test_invalid_cookie_returns_401_on_api(gated_app):
    gated_app.cookies.set(SESSION_AT_COOKIE, "garbage-not-a-real-token")
    r = gated_app.get("/api/sessions")
    assert r.status_code == 401


def test_invalid_cookie_redirects_on_html(gated_app):
    gated_app.cookies.set(SESSION_AT_COOKIE, "garbage")
    r = gated_app.get("/", follow_redirects=False)
    assert r.status_code == 302
    # Phase 6: gate carries a ``next=`` so post-login bounces back to /.
    assert r.headers["location"] in ("/login", "/login?next=%2F")


def test_logout_clears_cookies_and_redirects_to_login(gated_app):
    # First log in.
    r1 = gated_app.get("/auth/login?provider=stub", follow_redirects=False)
    state = r1.headers["location"].split("state=")[1]
    gated_app.get(
        f"/auth/callback?code=stub_code&state={state}",
        follow_redirects=False,
    )
    # Now log out.
    r = gated_app.post("/auth/logout", follow_redirects=False)
    assert r.status_code == 302
    assert r.headers["location"] == "/login"
    set_cookies = r.headers.get_list("set-cookie")
    assert any(
        c.startswith("hermes_session_at=") and "Max-Age=0" in c
        for c in set_cookies
    )
    assert any(
        c.startswith("hermes_session_rt=") and "Max-Age=0" in c
        for c in set_cookies
    )


# ---------------------------------------------------------------------------
# Identity probe
# ---------------------------------------------------------------------------


def test_api_auth_me_returns_session_after_login(gated_app):
    r1 = gated_app.get("/auth/login?provider=stub", follow_redirects=False)
    state = r1.headers["location"].split("state=")[1]
    gated_app.get(
        f"/auth/callback?code=stub_code&state={state}",
        follow_redirects=False,
    )
    r = gated_app.get("/api/auth/me")
    assert r.status_code == 200
    body = r.json()
    assert body["user_id"] == "stub-user-1"
    assert body["email"] == "stub@example.test"
    assert body["display_name"] == "Stub User"
    assert body["provider"] == "stub"
    assert body["org_id"] == "stub-org-1"
    assert "expires_at" in body


def test_api_auth_me_requires_auth(gated_app):
    # No cookies.
    r = gated_app.get("/api/auth/me")
    assert r.status_code == 401


# ---------------------------------------------------------------------------
# Zero-providers fail-closed
# ---------------------------------------------------------------------------


def test_gated_zero_providers_fails_closed_on_api_auth_providers():
    """If gate is on but no providers are registered, /api/auth/providers 503s."""
    clear_providers()
    prev_required = getattr(web_server.app.state, "auth_required", None)
    prev_host = getattr(web_server.app.state, "bound_host", None)
    web_server.app.state.bound_host = "fly-app.fly.dev"
    web_server.app.state.auth_required = True
    try:
        client = TestClient(web_server.app, base_url="https://fly-app.fly.dev")
        r = client.get("/api/auth/providers")
        assert r.status_code == 503
        assert "no auth providers" in r.text.lower()
    finally:
        web_server.app.state.auth_required = prev_required
        web_server.app.state.bound_host = prev_host


def test_gated_zero_providers_login_page_renders_help_text():
    clear_providers()
    prev_required = getattr(web_server.app.state, "auth_required", None)
    prev_host = getattr(web_server.app.state, "bound_host", None)
    web_server.app.state.bound_host = "fly-app.fly.dev"
    web_server.app.state.auth_required = True
    try:
        client = TestClient(web_server.app, base_url="https://fly-app.fly.dev")
        r = client.get("/login")
        assert r.status_code == 200
        # Empty-provider HTML mentions the fix-up path.  (HTML wraps text
        # so we can't grep for the exact phrase; check for the canonical
        # fragments instead.)
        text = r.text.lower()
        assert "sign-in unavailable" in text
        assert "no authentication" in text
        assert "providers are installed" in text
        assert "--insecure" in text
    finally:
        web_server.app.state.auth_required = prev_required
        web_server.app.state.bound_host = prev_host


# ---------------------------------------------------------------------------
# Multi-provider verify: a ProviderError from one provider must not abort the
# chain when another provider can verify the token.
# ---------------------------------------------------------------------------


class _UnreachableProvider(StubAuthProvider):
    """A provider whose IDP is unreachable: verify_session always raises.

    Models the real-world bug — a self-hosted-OIDC session hits the ``nous``
    provider first, which tries to reach Nous Portal's JWKS; if that's
    unreachable ``nous`` raises ProviderError. The gate must keep trying the
    remaining providers rather than 503-ing the whole request.
    """

    name = "unreachable"
    display_name = "Unreachable IdP (test only)"

    def verify_session(self, *, access_token: str):
        from hermes_cli.dashboard_auth.base import ProviderError

        raise ProviderError("simulated: IDP/JWKS unreachable")

    def refresh_session(self, *, refresh_token: str):
        from hermes_cli.dashboard_auth.base import ProviderError

        raise ProviderError("simulated: IDP/JWKS unreachable")


def _mint_stub_at(stub: StubAuthProvider) -> str:
    """Mint a valid access-token cookie value from a StubAuthProvider via its
    own login round trip (so the HMAC signature matches what verify expects)."""
    ls = stub.start_login(redirect_uri="https://fly-app.fly.dev/auth/callback")
    state = dict(
        seg.split("=", 1)
        for seg in ls.cookie_payload["hermes_session_pkce"].split(";")
        if "=" in seg
    )["state"]
    verifier = dict(
        seg.split("=", 1)
        for seg in ls.cookie_payload["hermes_session_pkce"].split(";")
        if "=" in seg
    )["verifier"]
    session = stub.complete_login(
        code="stub_code",
        state=state,
        code_verifier=verifier,
        redirect_uri="https://fly-app.fly.dev/auth/callback",
    )
    return session.access_token


@pytest.fixture
def _gated_state():
    """Bare gated app-state setup WITHOUT registering any provider, so each
    test controls provider registration order itself. Yields a factory that
    builds the TestClient after providers are registered."""
    clear_providers()
    prev_host = getattr(web_server.app.state, "bound_host", None)
    prev_port = getattr(web_server.app.state, "bound_port", None)
    prev_required = getattr(web_server.app.state, "auth_required", None)
    web_server.app.state.bound_host = "fly-app.fly.dev"
    web_server.app.state.bound_port = 443
    web_server.app.state.auth_required = True

    def _client() -> TestClient:
        return TestClient(web_server.app, base_url="https://fly-app.fly.dev")

    yield _client
    clear_providers()
    web_server.app.state.bound_host = prev_host
    web_server.app.state.bound_port = prev_port
    web_server.app.state.auth_required = prev_required


def test_unreachable_first_provider_does_not_block_second(_gated_state):
    """An unreachable provider registered FIRST must not 503 a request whose
    token a later provider can verify.

    Regression for the stacked-provider bug: the verify loop used to return
    503 on the first provider's ProviderError, before the working provider
    ever got a turn. Now it logs, continues, and the working provider wins.
    """
    working = StubAuthProvider()
    register_provider(_UnreachableProvider())  # registered first → tried first
    register_provider(working)                  # the one that can verify

    at = _mint_stub_at(working)
    client = _gated_state()
    client.cookies.set(SESSION_AT_COOKIE, at)
    r = client.get("/api/auth/me")
    assert r.status_code == 200, (
        f"Expected the working provider to verify the session despite the "
        f"unreachable one being tried first; got {r.status_code}: {r.text}"
    )
    body = r.json()
    assert body["provider"] == "stub"
    assert body["user_id"] == "stub-user-1"


def test_all_providers_unreachable_returns_503(_gated_state):
    """If NO provider can verify the token AND at least one was unreachable,
    surface 503 (transient outage) rather than forcing a needless re-login."""
    register_provider(_UnreachableProvider())
    client = _gated_state()
    # Any non-empty cookie — the unreachable provider raises before parsing.
    client.cookies.set(SESSION_AT_COOKIE, "some-opaque-token")
    r = client.get("/api/auth/me")
    assert r.status_code == 503
    assert "unreachable" in r.text.lower()


def test_unverifiable_token_with_reachable_providers_redirects(_gated_state):
    """When every provider is REACHABLE but none recognises the token (all
    return None, none raises), the gate falls through to re-login — NOT 503."""
    register_provider(StubAuthProvider())
    client = _gated_state()
    client.cookies.set(SESSION_AT_COOKIE, "garbage-not-a-real-token")
    # API path → 401; HTML would 302. Either way, NOT 503.
    r = client.get("/api/auth/me")
    assert r.status_code == 401
    assert "unreachable" not in r.text.lower()
