"""
TDD scaffold for Phase 7.4: Token fingerprinting / token binding.

Covers FGP-01..FGP-04:
  - FGP-01 test_fgp_match_returns_200: token issued with matching UA/lang →
    request with same headers returns 200.
  - FGP-02 test_fgp_mismatch_returns_401: token issued for one UA, request
    arrives with different UA → 401 "Token fingerprint mismatch".
  - FGP-03 test_no_fgp_claim_allowed: token manually crafted without "fgp"
    key → 200 (graceful migration; tokens issued before Phase 7.4 keep
    working).
  - FGP-04 test_missing_headers_empty_string_binding: token issued with no
    UA/lang (defaults to ""), request sent with no User-Agent / Accept-Language
    headers → 200 (empty-string fingerprint matches).

All four tests are xfail(strict=False) until Wave 1 (Plan 07.4-02) implements
the fgp claim in services/auth.py and deps/auth.py.
"""
import uuid

import pytest
import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from fastapi import FastAPI, Depends
from sqlalchemy.ext.asyncio import AsyncSession

from tests.test_auth_api import FakeRedis


# ── Minimal test app with /test/me route ──────────────────────────────────────


def make_test_app():
    """Create a minimal FastAPI app that exercises the auth deps.

    Phase 7.4: app.state.redis is set to a FakeRedis() instance so the
    NBF check and fgp check in get_current_user can call
    request.app.state.redis without raising AttributeError.
    """
    from deps.auth import get_current_user
    from db.models import User

    test_app = FastAPI()

    @test_app.get("/test/me")
    async def get_me(current_user: User = Depends(get_current_user)):
        return {"id": str(current_user.id), "role": current_user.role}

    # Mount FakeRedis so NBF / fgp checks in get_current_user work
    test_app.state.redis = FakeRedis()

    return test_app


@pytest_asyncio.fixture
async def auth_client(db_session: AsyncSession):
    """Async HTTP test client for the auth-dep test app."""
    from deps.db import get_db

    app = make_test_app()
    app.dependency_overrides[get_db] = lambda: db_session

    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as c:
        yield c

    app.dependency_overrides.clear()


async def _create_user(db_session, role: str = "user", is_active: bool = True):
    """Helper: insert a minimal User row into the test DB."""
    from db.models import User
    from services.auth import hash_password

    user = User(
        id=uuid.uuid4(),
        handle=f"user_{uuid.uuid4().hex[:6]}",
        email=f"{uuid.uuid4().hex[:6]}@example.com",
        password_hash=hash_password("testpassword"),
        role=role,
        is_active=is_active,
    )
    db_session.add(user)
    await db_session.commit()
    return user


# ── FGP stubs (Wave 0) ────────────────────────────────────────────────────────


@pytest.mark.xfail(strict=False, reason="not implemented yet")
@pytest.mark.asyncio
async def test_fgp_match_returns_200(auth_client, db_session):
    """FGP-01: token issued with matching UA/Accept-Language → 200."""
    pytest.xfail("not implemented yet")


@pytest.mark.xfail(strict=False, reason="not implemented yet")
@pytest.mark.asyncio
async def test_fgp_mismatch_returns_401(auth_client, db_session):
    """FGP-02: token issued for one UA, request from different UA → 401."""
    pytest.xfail("not implemented yet")


@pytest.mark.xfail(strict=False, reason="not implemented yet")
@pytest.mark.asyncio
async def test_no_fgp_claim_allowed(auth_client, db_session):
    """FGP-03: token without fgp claim → 200 (migration grace period)."""
    pytest.xfail("not implemented yet")


@pytest.mark.xfail(strict=False, reason="not implemented yet")
@pytest.mark.asyncio
async def test_missing_headers_empty_string_binding(auth_client, db_session):
    """FGP-04: token issued with no headers (empty-string binding), request with no headers → 200."""
    pytest.xfail("not implemented yet")