"""Opt-in HTTP fixture: real middleware/routes, no ambient startup or database."""
from collections.abc import AsyncIterator, Iterator
from contextlib import asynccontextmanager

import pytest
from fastapi import FastAPI

from modelforge_api.db import engine as ambient_engine
from modelforge_api.main import app


@pytest.fixture
def isolated_http_contract(monkeypatch: pytest.MonkeyPatch) -> Iterator[None]:
    # These exercise the real HTTP stack with fake collectors, not application startup.
    # Do not run reconciliation, schema validation or background polling against .env.
    @asynccontextmanager
    async def contract_lifespan(_app: FastAPI) -> AsyncIterator[None]:
        yield

    ambient_connections: list[str] = []

    def reject_ambient_connection(*args: object, **kwargs: object) -> None:
        ambient_connections.append("connection attempted")
        raise AssertionError("HTTP contract tests must not use the ambient database")

    monkeypatch.setattr(ambient_engine, "connect", reject_ambient_connection)
    monkeypatch.setattr(ambient_engine, "raw_connection", reject_ambient_connection)
    monkeypatch.setattr(app.router, "lifespan_context", contract_lifespan)
    # Restore the original mapping (including other tests' overrides) on teardown.
    monkeypatch.setattr(app, "dependency_overrides", {})
    yield
    assert not ambient_connections