"""Integration tests for per-user cloud credentials and cloud endpoint permissions.

Regression tests for:
- Per-user cloud token storage (when auth enabled)
- Global fallback (when auth disabled)
- Cloud endpoints use CLOUD_AUTH permission (not SETTINGS_READ)
"""

from unittest.mock import AsyncMock, patch

import pytest
from httpx import AsyncClient


class TestPerUserCloudCredentials:
    """Tests that cloud credentials are stored per-user when auth is enabled."""

    @pytest.fixture
    async def user_with_cloud_auth(self, db_session):
        """Create a user with CLOUD_AUTH permission via a group."""
        from backend.app.core.auth import get_password_hash
        from backend.app.models.group import Group
        from backend.app.models.user import User

        group = Group(
            name="CloudUsers",
            permissions=["cloud:auth", "filaments:read", "printers:read", "firmware:read"],
        )
        db_session.add(group)
        await db_session.flush()

        user = User(
            username="clouduser",
            password_hash=get_password_hash("testpass123"),
            role="user",
        )
        db_session.add(user)
        await db_session.flush()
        user.groups.append(group)
        await db_session.commit()
        await db_session.refresh(user)
        return user

    @pytest.fixture
    async def second_user_with_cloud_auth(self, db_session):
        """Create a second user with CLOUD_AUTH permission."""
        from sqlalchemy import select

        from backend.app.core.auth import get_password_hash
        from backend.app.models.group import Group
        from backend.app.models.user import User

        result = await db_session.execute(select(Group).where(Group.name == "CloudUsers"))
        group = result.scalar_one_or_none()
        if not group:
            group = Group(
                name="CloudUsers2",
                permissions=["cloud:auth", "filaments:read", "printers:read", "firmware:read"],
            )
            db_session.add(group)
            await db_session.flush()

        user = User(
            username="clouduser2",
            password_hash=get_password_hash("testpass456"),
            role="user",
        )
        db_session.add(user)
        await db_session.flush()
        user.groups.append(group)
        await db_session.commit()
        await db_session.refresh(user)
        return user

    @pytest.fixture
    async def cloud_auth_token(self, user_with_cloud_auth, async_client: AsyncClient):
        """Get auth token for user with cloud permissions."""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={"username": "clouduser", "password": "testpass123"},
        )
        if response.status_code == 200:
            return response.json().get("access_token")
        return None

    @pytest.fixture
    async def second_auth_token(self, second_user_with_cloud_auth, async_client: AsyncClient):
        """Get auth token for second user."""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={"username": "clouduser2", "password": "testpass456"},
        )
        if response.status_code == 200:
            return response.json().get("access_token")
        return None

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_status_returns_not_authenticated_by_default(self, async_client: AsyncClient):
        """Cloud status should show not authenticated when no token is stored."""
        with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
            response = await async_client.get("/api/v1/cloud/status")
            assert response.status_code == 200
            data = response.json()
            assert data["is_authenticated"] is False

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_status_accessible_when_auth_disabled(self, async_client: AsyncClient):
        """Cloud endpoints should work when auth is disabled (global fallback)."""
        with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
            response = await async_client.get("/api/v1/cloud/status")
            assert response.status_code == 200

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_status_requires_auth_when_enabled(self, async_client: AsyncClient):
        """Cloud endpoints should require auth when auth is enabled."""
        with patch("backend.app.core.auth.is_auth_enabled", return_value=True):
            response = await async_client.get("/api/v1/cloud/status")
            assert response.status_code == 401


class TestCloudEndpointPermissions:
    """Tests that cloud endpoints use CLOUD_AUTH permission, not SETTINGS_READ.

    Uses JWT tokens created directly (not via login endpoint) to avoid
    test infrastructure complexity with user creation across sessions.
    """

    @pytest.fixture
    async def settings_only_setup(self, async_client: AsyncClient):
        """Create user with settings:read but NOT cloud:auth, return JWT."""
        from backend.app.core.auth import create_access_token, get_password_hash
        from backend.app.core.database import async_session
        from backend.app.models.group import Group
        from backend.app.models.user import User

        async with async_session() as db:
            group = Group(name="SettingsReaders", permissions=["settings:read"])
            db.add(group)
            user = User(
                username="settingsuser",
                password_hash=get_password_hash("testpass123"),
                role="user",
            )
            db.add(user)
            await db.commit()
            await db.refresh(group)
            await db.refresh(user)

            from sqlalchemy import text

            await db.execute(
                text("INSERT INTO user_groups (user_id, group_id) VALUES (:uid, :gid)"),
                {"uid": user.id, "gid": group.id},
            )
            await db.commit()

        return create_access_token(data={"sub": "settingsuser"})

    @pytest.fixture
    async def cloud_only_setup(self, async_client: AsyncClient):
        """Create user with cloud:auth but NOT settings:read, return JWT."""
        from backend.app.core.auth import create_access_token, get_password_hash
        from backend.app.core.database import async_session
        from backend.app.models.group import Group
        from backend.app.models.user import User

        async with async_session() as db:
            group = Group(name="CloudOnly", permissions=["cloud:auth"])
            db.add(group)
            user = User(
                username="cloudonly",
                password_hash=get_password_hash("testpass123"),
                role="user",
            )
            db.add(user)
            await db.commit()
            await db.refresh(group)
            await db.refresh(user)

            from sqlalchemy import text

            await db.execute(
                text("INSERT INTO user_groups (user_id, group_id) VALUES (:uid, :gid)"),
                {"uid": user.id, "gid": group.id},
            )
            await db.commit()

        return create_access_token(data={"sub": "cloudonly"})

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_settings_requires_cloud_auth_not_settings_read(
        self, async_client: AsyncClient, settings_only_setup, cloud_only_setup
    ):
        """GET /cloud/settings should require CLOUD_AUTH, not SETTINGS_READ.

        Regression test: previously used SETTINGS_READ which blocked users who
        had cloud:auth permission but not settings:read.
        """
        with patch("backend.app.core.auth.is_auth_enabled", return_value=True):
            # User with only settings:read should be denied
            response = await async_client.get(
                "/api/v1/cloud/settings",
                headers={"Authorization": f"Bearer {settings_only_setup}"},
            )
            assert response.status_code == 403

            # User with cloud:auth should be allowed (will get 401 since no cloud token,
            # but NOT 403 — permission check passes)
            response = await async_client.get(
                "/api/v1/cloud/settings",
                headers={"Authorization": f"Bearer {cloud_only_setup}"},
            )
            assert response.status_code == 401  # No cloud token, but permission OK

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_status_requires_cloud_auth(
        self, async_client: AsyncClient, settings_only_setup, cloud_only_setup
    ):
        """GET /cloud/status should require CLOUD_AUTH."""
        with patch("backend.app.core.auth.is_auth_enabled", return_value=True):
            # settings:read only → 403
            response = await async_client.get(
                "/api/v1/cloud/status",
                headers={"Authorization": f"Bearer {settings_only_setup}"},
            )
            assert response.status_code == 403

            # cloud:auth → 200
            response = await async_client.get(
                "/api/v1/cloud/status",
                headers={"Authorization": f"Bearer {cloud_only_setup}"},
            )
            assert response.status_code == 200

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_fields_requires_cloud_auth(
        self, async_client: AsyncClient, settings_only_setup, cloud_only_setup
    ):
        """GET /cloud/fields should require CLOUD_AUTH, not SETTINGS_READ."""
        with patch("backend.app.core.auth.is_auth_enabled", return_value=True):
            # settings:read only → 403
            response = await async_client.get(
                "/api/v1/cloud/fields",
                headers={"Authorization": f"Bearer {settings_only_setup}"},
            )
            assert response.status_code == 403

            # cloud:auth → 200
            response = await async_client.get(
                "/api/v1/cloud/fields",
                headers={"Authorization": f"Bearer {cloud_only_setup}"},
            )
            assert response.status_code == 200


class TestCloudTokenStorage:
    """Unit-level tests for the token storage functions."""

    @pytest.mark.asyncio
    async def test_get_stored_token_returns_none_when_no_user_no_global(self, db_session):
        """get_stored_token with user=None and no global token returns (None, None)."""
        from backend.app.api.routes.cloud import get_stored_token

        token, email, region = await get_stored_token(db_session, user=None)
        assert token is None
        assert email is None
        assert region == "global"  # default for missing rows

    @pytest.mark.asyncio
    async def test_store_and_get_global_token(self, db_session):
        """store_token with user=None stores in global Settings table."""
        from backend.app.api.routes.cloud import get_stored_token, store_token

        await store_token(db_session, "test-token-123", "test@example.com", "global", user=None)
        token, email, region = await get_stored_token(db_session, user=None)
        assert token == "test-token-123"
        assert email == "test@example.com"
        assert region == "global"

    @pytest.mark.asyncio
    async def test_store_and_get_per_user_token(self, db_session):
        """store_token with user stores on the user record."""
        from backend.app.api.routes.cloud import get_stored_token, store_token
        from backend.app.core.auth import get_password_hash
        from backend.app.models.user import User

        user = User(username="tokentest", password_hash=get_password_hash("pass"), role="user")
        db_session.add(user)
        await db_session.commit()
        await db_session.refresh(user)

        await store_token(db_session, "user-token-abc", "user@example.com", "global", user=user)

        # Re-fetch user to verify persistence
        from sqlalchemy import select

        result = await db_session.execute(select(User).where(User.id == user.id))
        refreshed = result.scalar_one()
        assert refreshed.cloud_token == "user-token-abc"
        assert refreshed.cloud_email == "user@example.com"
        assert refreshed.cloud_region == "global"

    @pytest.mark.asyncio
    async def test_per_user_token_does_not_affect_global(self, db_session):
        """Storing per-user token should not affect global Settings."""
        from backend.app.api.routes.cloud import get_stored_token, store_token
        from backend.app.core.auth import get_password_hash
        from backend.app.models.user import User

        user = User(username="isolationtest", password_hash=get_password_hash("pass"), role="user")
        db_session.add(user)
        await db_session.commit()
        await db_session.refresh(user)

        # Store per-user token
        await store_token(db_session, "per-user-token", "per-user@test.com", "global", user=user)

        # Global should still be empty
        global_token, global_email, _ = await get_stored_token(db_session, user=None)
        assert global_token is None
        assert global_email is None

    @pytest.mark.asyncio
    async def test_clear_per_user_token(self, db_session):
        """clear_token with user clears only that user's credentials."""
        from backend.app.api.routes.cloud import clear_token, store_token
        from backend.app.core.auth import get_password_hash
        from backend.app.models.user import User

        user = User(username="cleartest", password_hash=get_password_hash("pass"), role="user")
        db_session.add(user)
        await db_session.commit()
        await db_session.refresh(user)

        await store_token(db_session, "to-clear", "clear@test.com", "china", user=user)
        await clear_token(db_session, user=user)

        from sqlalchemy import select

        result = await db_session.execute(select(User).where(User.id == user.id))
        refreshed = result.scalar_one()
        assert refreshed.cloud_token is None
        assert refreshed.cloud_email is None
        assert refreshed.cloud_region is None

    @pytest.mark.asyncio
    async def test_clear_global_token(self, db_session):
        """clear_token with user=None clears from global Settings."""
        from backend.app.api.routes.cloud import clear_token, get_stored_token, store_token

        await store_token(db_session, "global-token", "global@test.com", "global", user=None)
        await clear_token(db_session, user=None)

        token, email, region = await get_stored_token(db_session, user=None)
        assert token is None
        assert email is None
        assert region == "global"  # normalised default

    @pytest.mark.asyncio
    async def test_two_users_independent_tokens(self, db_session):
        """Two users should have completely independent cloud tokens and regions."""
        from backend.app.api.routes.cloud import get_stored_token, store_token
        from backend.app.core.auth import get_password_hash
        from backend.app.models.user import User

        user_a = User(username="user_a", password_hash=get_password_hash("pass"), role="user")
        user_b = User(username="user_b", password_hash=get_password_hash("pass"), role="user")
        db_session.add_all([user_a, user_b])
        await db_session.commit()
        await db_session.refresh(user_a)
        await db_session.refresh(user_b)

        # Different regions on purpose — a China user and a Global user must not
        # bleed their region into each other's lookups.
        await store_token(db_session, "token-a", "a@test.com", "china", user=user_a)
        await store_token(db_session, "token-b", "b@test.com", "global", user=user_b)

        # Verify each user reads their own token (re-fetch from DB)
        from sqlalchemy import select

        result_a = await db_session.execute(select(User).where(User.id == user_a.id))
        result_b = await db_session.execute(select(User).where(User.id == user_b.id))
        fresh_a = result_a.scalar_one()
        fresh_b = result_b.scalar_one()

        token_a, email_a, region_a = await get_stored_token(db_session, user=fresh_a)
        token_b, email_b, region_b = await get_stored_token(db_session, user=fresh_b)

        assert token_a == "token-a"
        assert email_a == "a@test.com"
        assert region_a == "china"
        assert token_b == "token-b"
        assert email_b == "b@test.com"
        assert region_b == "global"


class TestCloudRegionPersistence:
    """Region must survive a DB round-trip so restarts don't silently flip users to api.bambulab.com."""

    @pytest.mark.asyncio
    async def test_region_survives_roundtrip_per_user(self, db_session):
        """Stored China region is returned on subsequent get_stored_token calls."""
        from backend.app.api.routes.cloud import get_stored_token, store_token
        from backend.app.core.auth import get_password_hash
        from backend.app.models.user import User

        user = User(username="region-user", password_hash=get_password_hash("pass"), role="user")
        db_session.add(user)
        await db_session.commit()
        await db_session.refresh(user)

        await store_token(db_session, "cn-token", "token-auth", "china", user=user)

        # Simulate "next request": re-fetch the user fresh from the DB.
        from sqlalchemy import select

        result = await db_session.execute(select(User).where(User.id == user.id))
        refreshed = result.scalar_one()

        _token, _email, region = await get_stored_token(db_session, user=refreshed)
        assert region == "china"

    @pytest.mark.asyncio
    async def test_region_survives_roundtrip_global_fallback(self, db_session):
        """Stored China region in auth-disabled Settings fallback survives too."""
        from backend.app.api.routes.cloud import get_stored_token, store_token

        await store_token(db_session, "cn-token", "token-auth", "china", user=None)
        _token, _email, region = await get_stored_token(db_session, user=None)
        assert region == "china"

    @pytest.mark.asyncio
    async def test_invalid_region_is_normalised_to_global(self, db_session):
        """Unknown region values fall back to 'global' rather than mis-route."""
        from backend.app.api.routes.cloud import get_stored_token, store_token

        await store_token(db_session, "t", "x@test.com", "mars", user=None)
        _token, _email, region = await get_stored_token(db_session, user=None)
        assert region == "global"

    @pytest.mark.asyncio
    async def test_build_authenticated_cloud_uses_stored_region(self, db_session):
        """build_authenticated_cloud wires the stored region into the per-request service."""
        from backend.app.api.routes.cloud import build_authenticated_cloud, store_token
        from backend.app.core.auth import get_password_hash
        from backend.app.models.user import User

        user = User(username="cn-build", password_hash=get_password_hash("pass"), role="user")
        db_session.add(user)
        await db_session.commit()
        await db_session.refresh(user)

        await store_token(db_session, "cn-token", "token-auth", "china", user=user)

        from sqlalchemy import select

        result = await db_session.execute(select(User).where(User.id == user.id))
        refreshed = result.scalar_one()

        cloud = await build_authenticated_cloud(db_session, refreshed)
        assert cloud is not None
        try:
            assert cloud.base_url == "https://api.bambulab.cn"
            assert cloud.access_token == "cn-token"
        finally:
            await cloud.close()


class TestCloudRouteRegionPlumbing:
    """Route-level proof that region=china on the wire actually steers outbound
    HTTP calls to api.bambulab.cn / bambulab.cn. This is the core bug the PR
    fixes — unit tests prove the service does the right thing given the region,
    storage tests prove the region persists, but only these tests prove the
    route handlers plumb the region through end-to-end.

    Auth is disabled (Settings-fallback path) to keep the fixture footprint
    minimal; the region plumbing code path is identical for the per-user path.
    """

    @staticmethod
    def _capturing_client(response_json: dict, status: int = 200):
        """Build an httpx.AsyncClient backed by MockTransport that records every
        outbound request URL. Returns ``(client, captured_urls)``.

        Using MockTransport (rather than ``patch.object(httpx.AsyncClient, ...)``)
        is critical: class-level method patches also intercept the ASGI test
        client's own requests, so the route handler never runs and the
        assertions end up inspecting the test-client URL instead of the
        backend's outbound URL. MockTransport only affects the client we
        inject into the backend via ``set_shared_http_client``.
        """
        import httpx

        captured: list[str] = []

        def handler(request: httpx.Request) -> httpx.Response:
            captured.append(str(request.url))
            return httpx.Response(status, json=response_json)

        client = httpx.AsyncClient(transport=httpx.MockTransport(handler))
        return client, captured

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_set_token_route_with_china_region_hits_cn_endpoint(self, async_client: AsyncClient):
        """POST /cloud/token with region=china routes get_user_profile to api.bambulab.cn."""
        from backend.app.services.bambu_cloud import set_shared_http_client

        mock_client, captured_urls = self._capturing_client({"uid": "123", "email": "x"})
        set_shared_http_client(mock_client)
        try:
            with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
                response = await async_client.post(
                    "/api/v1/cloud/token",
                    json={"access_token": "cn-token", "region": "china"},
                )

                assert response.status_code == 200
                assert any("api.bambulab.cn" in url for url in captured_urls), captured_urls
                assert not any("api.bambulab.com" in url for url in captured_urls), captured_urls
        finally:
            set_shared_http_client(None)
            await mock_client.aclose()

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_login_route_with_china_region_hits_cn_endpoint(self, async_client: AsyncClient):
        """POST /cloud/login with region=china routes login_request to api.bambulab.cn."""
        from backend.app.services.bambu_cloud import set_shared_http_client

        mock_client, captured_urls = self._capturing_client({"loginType": "verifyCode"})
        set_shared_http_client(mock_client)
        try:
            with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
                response = await async_client.post(
                    "/api/v1/cloud/login",
                    json={"email": "user@example.com", "password": "x", "region": "china"},
                )

                assert response.status_code == 200
                assert any("api.bambulab.cn" in url for url in captured_urls), captured_urls
                assert not any("api.bambulab.com" in url for url in captured_urls), captured_urls
        finally:
            set_shared_http_client(None)
            await mock_client.aclose()

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_verify_route_with_china_region_hits_cn_tfa_endpoint(self, async_client: AsyncClient):
        """POST /cloud/verify with region=china + tfa_key routes TOTP to bambulab.cn."""
        from backend.app.services.bambu_cloud import set_shared_http_client

        mock_client, captured_urls = self._capturing_client({"token": "t"})
        set_shared_http_client(mock_client)
        try:
            with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
                response = await async_client.post(
                    "/api/v1/cloud/verify",
                    json={
                        "email": "user@example.com",
                        "code": "123456",
                        "tfa_key": "tfa-xyz",
                        "region": "china",
                    },
                )

                assert response.status_code == 200
                # TOTP endpoint lives on bambulab.cn (without the api. prefix),
                # NOT bambulab.com — that's exactly the bug we just fixed.
                assert any("bambulab.cn/api/sign-in/tfa" in url for url in captured_urls), captured_urls
                assert not any("bambulab.com" in url for url in captured_urls), captured_urls
        finally:
            set_shared_http_client(None)
            await mock_client.aclose()

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_status_exposes_stored_region(self, async_client: AsyncClient):
        """GET /cloud/status returns the stored region so the UI can render
        'Connected (China)' after a reload."""
        from backend.app.api.routes.cloud import store_token
        from backend.app.core.database import async_session

        with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
            async with async_session() as db:
                await store_token(db, "cn-token", "token-auth", "china", user=None)

            response = await async_client.get("/api/v1/cloud/status")
            assert response.status_code == 200
            data = response.json()
            assert data["is_authenticated"] is True
            assert data["region"] == "china"

    @pytest.mark.asyncio
    @pytest.mark.integration
    async def test_cloud_status_region_is_null_when_unauthenticated(self, async_client: AsyncClient):
        """No stored token ⇒ no region in the status payload."""
        with patch("backend.app.core.auth.is_auth_enabled", return_value=False):
            response = await async_client.get("/api/v1/cloud/status")
            assert response.status_code == 200
            data = response.json()
            assert data["is_authenticated"] is False
            assert data["region"] is None