"""Tests for the multi-realm machinery: registry resolution, config
validation, ASGI dispatch, realm binding of auth codes, legacy database
conversion, log censoring and bootstrap caveats.
"""

from __future__ import annotations

import asyncio
import os
from datetime import UTC, datetime
from uuid import UUID

import httpx
import pytest
from kanta import Kanta

from paskia import authcode, realms
from paskia.bootstrap import check_admin_credentials
from paskia.db import create_credential
from paskia.db.legacy import (
    LegacyConfig,
    LegacyCredential,
    LegacyDB,
    LegacySession,
    convert_legacy_database,
)
from paskia.db.lifecycle import format_log_uuid
from paskia.db.operations import DB
from paskia.db.structs import Client, Config, Credential, RealmConfig
from paskia.fastapi.dispatch import DispatchMiddleware
from paskia.sansio import Passkey

# -------------------------------------------------------------------------
# Registry construction helpers
# -------------------------------------------------------------------------


def build_registry(*realm_configs: RealmConfig) -> realms.RealmRegistry:
    """Build and install a registry from realm configs (listen unset)."""
    realms.configure(listen=None)
    return realms.init_registry(Config(realms=list(realm_configs)))


ROR_CONFIG = Config(
    realms=[
        RealmConfig(
            rp_id="company.com",
            auth_host="https://auth.company.com",
            origins=["https://auth.company.com"],
            related_origins=["https://app.com"],
        ),
        RealmConfig(rp_id="pro.com"),
    ]
)


class StubApp:
    """ASGI app recording the scope it was called with."""

    def __init__(self):
        self.scope = None

    async def __call__(self, scope, receive, send):
        self.scope = scope


async def drive_ws(middleware: DispatchMiddleware, headers: list[tuple[bytes, bytes]]):
    """Run a websocket scope through the middleware, capturing sent messages."""

    async def receive():
        return {"type": "websocket.connect"}

    sent = []

    async def send(message):
        sent.append(message)

    stub = middleware.app
    await middleware(
        {"type": "websocket", "headers": headers, "path": "/"}, receive, send
    )
    return stub, sent


async def drive_http(
    middleware: DispatchMiddleware, headers: list[tuple[bytes, bytes]]
):
    """Run an http scope through the middleware, capturing sent messages."""

    async def receive():
        return {"type": "http.request", "body": b""}

    sent = []

    async def send(message):
        sent.append(message)

    stub = middleware.app
    await middleware(
        {
            "type": "http",
            "headers": headers,
            "method": "GET",
            "path": "/",
            "query_string": b"",
        },
        receive,
        send,
    )
    return stub, sent


# -------------------------------------------------------------------------
# Host resolution
# -------------------------------------------------------------------------


class TestResolve:
    def test_exact_rp_id(self):
        reg = build_registry(*ROR_CONFIG.realms)
        assert reg.resolve("pro.com").rp_id == "pro.com"
        assert reg.resolve("company.com").rp_id == "company.com"

    def test_auth_host_and_related_origin(self):
        reg = build_registry(*ROR_CONFIG.realms)
        assert reg.resolve("auth.company.com").rp_id == "company.com"
        assert reg.resolve("app.com").rp_id == "company.com"

    def test_subdomain_suffix_longest_match(self):
        reg = build_registry(
            RealmConfig(rp_id="example.com"), RealmConfig(rp_id="sub.example.com")
        )
        assert reg.resolve("www.example.com").rp_id == "example.com"
        assert reg.resolve("api.sub.example.com").rp_id == "sub.example.com"

    def test_port_and_trailing_dot_normalized(self):
        reg = build_registry(*ROR_CONFIG.realms)
        assert reg.resolve("pro.com:8443").rp_id == "pro.com"
        assert reg.resolve("app.com.").rp_id == "company.com"

    def test_unknown_host(self):
        reg = build_registry(*ROR_CONFIG.realms)
        assert reg.resolve("evil.com") is None
        assert reg.resolve("") is None
        assert reg.resolve(None) is None

    def test_effective_auth_host_fallback(self):
        reg = build_registry(*ROR_CONFIG.realms)
        company = reg.get("company.com")
        pro = reg.get("pro.com")
        assert reg.effective_auth_host(company) == "auth.company.com"
        # pro.com has no own auth host: falls back to the first configured one
        assert reg.effective_auth_host(pro) == "auth.company.com"
        # No auth hosts at all: None
        reg2 = build_registry(RealmConfig(rp_id="a.com"), RealmConfig(rp_id="b.com"))
        assert reg2.effective_auth_host(reg2.get("a.com")) is None


# -------------------------------------------------------------------------
# Cross-realm configuration validation
# -------------------------------------------------------------------------


class TestValidateConfig:
    def test_valid(self):
        realms.validate_config(ROR_CONFIG)

    def test_related_origin_cap(self):
        realms.validate_config(
            Config(
                realms=[
                    RealmConfig(
                        rp_id="company.com",
                        related_origins=[f"https://app{i}.com" for i in range(5)],
                    )
                ]
            )
        )
        with pytest.raises(ValueError, match="related origins"):
            realms.validate_config(
                Config(
                    realms=[
                        RealmConfig(
                            rp_id="company.com",
                            related_origins=[f"https://app{i}.com" for i in range(6)],
                        )
                    ]
                )
            )

    def test_origin_outside_rp_id_rejected(self):
        """In-domain origins are an allow-list; cross-domain needs related."""
        with pytest.raises(ValueError, match="outside the rp-id domain"):
            realms.validate_config(
                Config(
                    realms=[
                        RealmConfig(rp_id="a.com", origins=["https://elsewhere.com"])
                    ]
                )
            )

    def test_related_origin_inside_own_realm_rejected(self):
        """Subdomains of the rp-id are covered already; listing is an error."""
        with pytest.raises(ValueError, match="within the rp-id domain"):
            realms.validate_config(
                Config(
                    realms=[
                        RealmConfig(
                            rp_id="a.com", related_origins=["https://app.a.com"]
                        )
                    ]
                )
            )

    def test_wildcard_related_origin_rejected(self):
        """ROR entries are always individual origins; wildcards are meaningless."""
        with pytest.raises(ValueError, match="wildcard"):
            realms.validate_config(
                Config(realms=[RealmConfig(rp_id="a.com", related_origins=["*.b.com"])])
            )

    def test_wildcard_origin_in_domain_accepted(self):
        realms.validate_config(
            Config(realms=[RealmConfig(rp_id="a.com", origins=["*.a.com"])])
        )
        with pytest.raises(ValueError, match="outside the rp-id domain"):
            realms.validate_config(
                Config(realms=[RealmConfig(rp_id="a.com", origins=["*.b.com"])])
            )

    def test_auth_host_collision(self):
        with pytest.raises(ValueError, match="collides with a related origin"):
            realms.validate_config(
                Config(
                    realms=[
                        RealmConfig(rp_id="a.com", auth_host="https://auth.a.com"),
                        RealmConfig(
                            rp_id="b.com",
                            related_origins=["https://auth.a.com"],
                        ),
                    ]
                )
            )

    def test_related_origin_inside_other_realm(self):
        with pytest.raises(ValueError, match="falls inside realm"):
            realms.validate_config(
                Config(
                    realms=[
                        RealmConfig(
                            rp_id="a.com", related_origins=["https://app.b.com"]
                        ),
                        RealmConfig(rp_id="b.com"),
                    ]
                )
            )

    def test_auth_host_must_not_collide_with_rp_id(self):
        with pytest.raises(ValueError, match="collides with an rp-id"):
            realms.validate_config(
                Config(
                    realms=[
                        RealmConfig(rp_id="a.com", auth_host="https://b.a.com"),
                        RealmConfig(rp_id="b.a.com"),
                    ]
                )
            )


# -------------------------------------------------------------------------
# Best-effort serving: stored config sanitization
# -------------------------------------------------------------------------


class TestSanitizeConfig:
    """Serving never fails on stored config problems; it degrades + warns."""

    def test_cross_domain_origin_moved_to_related(self):
        config, warnings = realms.sanitize_config(
            Config(
                realms=[RealmConfig(rp_id="localhost", origins=["https://example.com"])]
            )
        )
        realm = config.realms[0]
        assert realm.origins is None
        assert realm.related_origins == ["https://example.com"]
        assert any("related origin" in w for w in warnings)
        realms.validate_config(config)  # sanitized config is strict-clean

    def test_malformed_origin_dropped(self):
        config, warnings = realms.sanitize_config(
            Config(realms=[RealmConfig(rp_id="a.com", origins=["not a url"])])
        )
        assert config.realms[0].origins is None
        assert warnings

    def test_invalid_rp_id_realm_dropped(self):
        config, warnings = realms.sanitize_config(
            Config(
                realms=[RealmConfig(rp_id="not a domain!"), RealmConfig(rp_id="ok.com")]
            )
        )
        assert [r.rp_id for r in config.realms] == ["ok.com"]
        assert any("dropped" in w for w in warnings)

    def test_duplicate_rp_id_first_wins(self):
        config, _warnings = realms.sanitize_config(
            Config(
                realms=[
                    RealmConfig(rp_id="a.com", rp_name="First"),
                    RealmConfig(rp_id="a.com"),
                ]
            )
        )
        assert len(config.realms) == 1
        assert config.realms[0].rp_name == "First"

    def test_related_inside_own_domain_dropped(self):
        config, _ = realms.sanitize_config(
            Config(
                realms=[
                    RealmConfig(rp_id="a.com", related_origins=["https://app.a.com"])
                ]
            )
        )
        assert config.realms[0].related_origins is None

    def test_wildcard_related_origin_dropped(self):
        config, warnings = realms.sanitize_config(
            Config(realms=[RealmConfig(rp_id="a.com", related_origins=["*.b.com"])])
        )
        assert config.realms[0].related_origins is None
        assert any("wildcard" in w for w in warnings)
        realms.validate_config(config)  # sanitized config is strict-clean

    def test_cap_exceeded_truncated(self):
        config, warnings = realms.sanitize_config(
            Config(
                realms=[
                    RealmConfig(
                        rp_id="a.com",
                        related_origins=[f"https://app{i}.com" for i in range(6)],
                    )
                ]
            )
        )
        assert len(config.realms[0].related_origins) == 5
        assert any("maximum" in w for w in warnings)

    def test_auth_host_outside_domain_ignored(self):
        config, warnings = realms.sanitize_config(
            Config(realms=[RealmConfig(rp_id="a.com", auth_host="https://auth.b.com")])
        )
        assert config.realms[0].auth_host is None
        assert any("auth host ignored" in w for w in warnings)

    def test_auth_host_colliding_with_rp_id_ignored(self):
        config, warnings = realms.sanitize_config(
            Config(
                realms=[
                    RealmConfig(rp_id="a.com", auth_host="https://auth.a.com"),
                    RealmConfig(rp_id="auth.a.com"),
                ]
            )
        )
        assert config.realms[0].auth_host is None
        assert any("collides with an rp-id" in w for w in warnings)

    def test_related_colliding_with_other_realm_dropped(self):
        config, _ = realms.sanitize_config(
            Config(
                realms=[
                    RealmConfig(rp_id="a.com", related_origins=["https://app.b.com"]),
                    RealmConfig(rp_id="b.com"),
                ]
            )
        )
        assert config.realms[0].related_origins is None

    def test_no_realms_is_fatal(self):
        with pytest.raises(ValueError, match="realm"):
            realms.sanitize_config(Config(realms=[]))
        with pytest.raises(ValueError, match="No servable realm"):
            realms.sanitize_config(Config(realms=[RealmConfig(rp_id="not a domain!")]))

    def test_build_tolerates_and_serves(self):
        # Cross-domain entry stored in origins: served as a related origin
        reg = build_registry(
            RealmConfig(rp_id="localhost", origins=["https://example.com"])
        )
        assert reg.warnings
        realm = reg.get("localhost")
        assert realm.related_origins == ["https://example.com"]
        realm.passkey.validate_origin("https://example.com")


# -------------------------------------------------------------------------
# Origin validation semantics (Passkey)
# -------------------------------------------------------------------------


class TestOriginValidation:
    """In-domain allow-list and related origins are separate concerns."""

    def test_default_allows_whole_subtree(self):
        p = Passkey(rp_id="example.com")
        assert p.validate_origin("https://example.com") == "https://example.com"
        assert p.validate_origin("https://app.example.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://other.com")

    def test_allow_list_restricts_subtree(self):
        p = Passkey(rp_id="example.com", origins=["https://app.example.com"])
        assert p.validate_origin("https://app.example.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://www.example.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://example.com")

    def test_related_origins_are_additive(self):
        p = Passkey(rp_id="example.com", related_origins=["https://app2.com"])
        assert p.validate_origin("https://app.example.com")  # subtree stays open
        assert p.validate_origin("https://app2.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://other.com")

    def test_wildcard_entry_matches_subtree(self):
        p = Passkey(rp_id="example.com", origins=["*.example.com"])
        assert p.validate_origin("https://example.com")
        assert p.validate_origin("https://app.example.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://other.com")

    def test_sub_wildcard_matches_only_its_subtree(self):
        p = Passkey(rp_id="example.com", origins=["*.app.example.com"])
        assert p.validate_origin("https://app.example.com")
        assert p.validate_origin("https://www.app.example.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://example.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://other.example.com")

    def test_wildcard_related_origin_rejected(self):
        with pytest.raises(ValueError, match="wildcard"):
            Passkey(rp_id="example.com", related_origins=["*.other.com"])

    def test_related_origins_combined_with_allow_list(self):
        p = Passkey(
            rp_id="example.com",
            origins=["https://app.example.com"],
            related_origins=["https://app2.com"],
        )
        assert p.validate_origin("https://app.example.com")
        assert p.validate_origin("https://app2.com")
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://www.example.com")

    def test_constructor_rejects_mixed_up_fields(self):
        with pytest.raises(ValueError, match="related origin"):
            Passkey(rp_id="example.com", origins=["https://app2.com"])
        with pytest.raises(ValueError, match="within the rp-id domain"):
            Passkey(rp_id="example.com", related_origins=["https://app.example.com"])

    def test_realm_wires_both_lists(self):
        reg = build_registry(*ROR_CONFIG.realms)
        p = reg.get("company.com").passkey
        assert p.validate_origin("https://app.com")  # related origin
        assert p.validate_origin("https://auth.company.com")  # allow-listed
        with pytest.raises(ValueError, match="not allowed"):
            p.validate_origin("https://www.company.com")  # not allow-listed


# -------------------------------------------------------------------------
# ASGI dispatch
# -------------------------------------------------------------------------


class TestDispatchMiddleware:
    @pytest.mark.asyncio
    async def test_http_unknown_host_421(self):
        build_registry(*ROR_CONFIG.realms)
        stub, sent = await drive_http(
            DispatchMiddleware(StubApp()), [(b"host", b"evil.com")]
        )
        assert stub.scope is None  # Inner app not called
        assert sent[0]["type"] == "http.response.start"
        assert sent[0]["status"] == 421

    @pytest.mark.asyncio
    async def test_http_dispatches_realm(self):
        build_registry(*ROR_CONFIG.realms)
        stub, _sent = await drive_http(
            DispatchMiddleware(StubApp()), [(b"host", b"app.com.")]
        )
        assert stub.scope is not None
        assert stub.scope["state"]["realm"].rp_id == "company.com"

    @pytest.mark.asyncio
    async def test_http_current_realm_set_inside_request(self):
        reg = build_registry(*ROR_CONFIG.realms)
        seen = {}

        async def app(scope, receive, send):
            seen["realm"] = realms.current_realm()

        await drive_http(DispatchMiddleware(app), [(b"host", b"pro.com")])
        assert seen["realm"].rp_id == "pro.com"
        # Contextvar is reset after the request
        assert realms.current_realm() is reg.default

    @pytest.mark.asyncio
    async def test_ws_unknown_host_closed(self):
        build_registry(*ROR_CONFIG.realms)
        stub, sent = await drive_ws(
            DispatchMiddleware(StubApp()), [(b"host", b"evil.com")]
        )
        assert stub.scope is None
        assert sent == [{"type": "websocket.close", "code": 1008}]

    @pytest.mark.asyncio
    async def test_ws_same_realm_origin(self):
        build_registry(*ROR_CONFIG.realms)
        stub, sent = await drive_ws(
            DispatchMiddleware(StubApp()),
            [(b"host", b"auth.company.com"), (b"origin", b"https://app.com")],
        )
        assert sent == []
        assert stub.scope["state"]["realm"].rp_id == "company.com"

    @pytest.mark.asyncio
    async def test_ws_cross_realm_requires_effective_auth_host(self):
        build_registry(*ROR_CONFIG.realms)
        # pro.com page connecting to the shared auth host: allowed, pro realm
        stub, sent = await drive_ws(
            DispatchMiddleware(StubApp()),
            [(b"host", b"auth.company.com"), (b"origin", b"https://pro.com")],
        )
        assert sent == []
        assert stub.scope["state"]["realm"].rp_id == "pro.com"

        # pro.com page connecting to some other host: closed pre-accept
        stub, sent = await drive_ws(
            DispatchMiddleware(StubApp()),
            [(b"host", b"company.com"), (b"origin", b"https://pro.com")],
        )
        assert stub.scope is None
        assert sent == [{"type": "websocket.close", "code": 1008}]

    @pytest.mark.asyncio
    async def test_ws_unknown_origin_uses_host_realm(self):
        build_registry(*ROR_CONFIG.realms)
        # Missing origin
        stub, _ = await drive_ws(DispatchMiddleware(StubApp()), [(b"host", b"pro.com")])
        assert stub.scope["state"]["realm"].rp_id == "pro.com"
        # Unknown origin: host realm applies (endpoint-side validation decides)
        stub, _ = await drive_ws(
            DispatchMiddleware(StubApp()),
            [(b"host", b"pro.com"), (b"origin", b"https://evil.com")],
        )
        assert stub.scope["state"]["realm"].rp_id == "pro.com"


# -------------------------------------------------------------------------
# Realm binding of auth codes
# -------------------------------------------------------------------------


class TestAuthCodeRealmBinding:
    @pytest.mark.asyncio
    async def test_cookie_code_rejected_on_other_realm(
        self, client: httpx.AsyncClient, session_token: str
    ):
        code = authcode.store_cookie(
            authcode.CookieCode(
                session_key=session_token,
                created=datetime.now(UTC),
                rp_id="other.com",
            )
        )
        response = await client.post(
            "/auth/api/set-session",
            headers={
                "Authorization": f"Bearer {code}",
                "Host": "localhost:4401",
            },
        )
        assert response.status_code == 401

    @pytest.mark.asyncio
    async def test_oidc_code_rejected_on_other_realm(
        self, client: httpx.AsyncClient, test_db: DB
    ):
        oidc_client, secret = Client.create(
            name="Test Client",
            redirect_uris=["https://client.example/callback"],
            client_secret="topsecret",
        )
        store = test_db._store
        with store.transaction("create_test_oidc_client"):
            test_db.oidc["localhost"].clients[oidc_client.uuid] = oidc_client

        code = authcode.store_oidc(
            authcode.OIDCCode(
                session_key="doesnotmatter1234",
                created=datetime.now(UTC),
                redirect_uri="https://client.example/callback",
                scope="openid",
                rp_id="other.com",
            )
        )
        response = await client.post(
            "/auth/oidc/token",
            data={
                "grant_type": "authorization_code",
                "code": code,
                "redirect_uri": "https://client.example/callback",
                "client_id": str(oidc_client.uuid),
                "client_secret": secret,
            },
            headers={"Host": "localhost:4401"},
        )
        assert response.status_code == 400
        assert response.json()["error"] == "invalid_grant"
        assert "realm" in response.json()["error_description"]


# -------------------------------------------------------------------------
# Legacy database conversion
# -------------------------------------------------------------------------


def _read_db(path) -> DB:
    async def _read() -> DB:
        new_db = DB()
        kanta = Kanta(str(path), new_db)
        await kanta.open(readonly=True)
        return kanta.data

    return asyncio.run(_read())


class TestLegacyConversion:
    def test_convert_stamps_realm_everywhere(self, tmp_path):
        src = tmp_path / "example.com.paskiadb"
        src.mkdir()
        src_file = src / "main.db"

        cred_uuid = UUID("019c6831-84cf-7b88-b66c-c8165890b7c5")
        user_uuid = UUID("019c6831-84cf-7b88-b66c-c8165890b7c6")

        async def _write() -> None:
            kanta = Kanta(str(src_file), LegacyDB())
            await kanta.open()
            with kanta.transaction("test:seed"):
                kanta.data.config = LegacyConfig(
                    rp_id="example.com",
                    rp_name="Example",
                    origins=["https://app.example.com"],
                )
                kanta.data.credentials[cred_uuid] = LegacyCredential(
                    credential_id=b"credential-id",
                    user_uuid=user_uuid,
                    aaguid=UUID(int=0),
                    public_key=b"public-key",
                    sign_count=3,
                    created_at=datetime.now(UTC),
                )
                kanta.data.sessions["session-key"] = LegacySession(
                    user_uuid=user_uuid,
                    credential_uuid=cred_uuid,
                    host="example.com",
                    ip="127.0.0.1",
                    user_agent="pytest",
                    validated=datetime.now(UTC),
                )
            await kanta.close()

        asyncio.run(_write())

        config = convert_legacy_database(src_file, tmp_path / "paskia.kantadb")
        assert config.default_realm.rp_id == "example.com"
        assert config.default_realm.rp_name == "Example"

        converted = _read_db(tmp_path / "paskia.kantadb")
        assert converted.credentials[cred_uuid].rp_id == "example.com"
        assert converted.sessions["session-key"].rp_id == "example.com"
        assert set(converted.oidc.keys()) == {"example.com"}


# -------------------------------------------------------------------------
# Transaction log censoring
# -------------------------------------------------------------------------


class TestLogCensoring:
    def test_oidc_key_values_hidden(self):
        assert format_log_uuid(b"raw-key-material", "oidc.localhost.key") == "<hidden>"
        assert format_log_uuid("secret", "oidc.example.com.key") == "<hidden>"

    def test_oidc_key_path_component_visible(self):
        # The path component itself must stay visible ("oidc.<rp-id>.key = <hidden>")
        assert format_log_uuid("key", "oidc.localhost.key") is None

    def test_other_paths_unaffected(self):
        assert format_log_uuid("not-a-uuid", "oidc.localhost.clients") is None
        assert format_log_uuid("not-a-uuid", "config.realms") is None


# -------------------------------------------------------------------------
# Bootstrap caveat: admin credential is checked on the default realm
# -------------------------------------------------------------------------


class TestBootstrapCaveat:
    @pytest.mark.asyncio
    async def test_admin_without_credentials_gets_link(
        self, test_db: DB, realm_registry
    ):
        assert await check_admin_credentials() is True

    @pytest.mark.asyncio
    async def test_admin_with_default_realm_credential_ok(
        self, test_db: DB, realm_registry, test_user, test_credential
    ):
        assert await check_admin_credentials() is False

    @pytest.mark.asyncio
    async def test_admin_with_only_other_realm_credential_gets_link(
        self, test_db: DB, realm_registry, test_user
    ):
        """A passkey under a non-default realm does not satisfy the check."""
        cred = Credential.create(
            credential_id=os.urandom(32),
            user=test_user.uuid,
            aaguid=UUID(int=0),
            public_key=os.urandom(64),
            sign_count=0,
            rp_id="example.com",
        )
        create_credential(cred)
        assert await check_admin_credentials() is True