"""Integration-level fixtures: testcontainers Postgres + Flask app + db session.

NF-state: SQLite is reserved for pure-logic unit tests; anything touching
constraints, RBAC role grants, or audit-log SQL behavior must run on a real
Postgres via testcontainers (spec H38).
"""

from __future__ import annotations

from collections.abc import Iterator

import pytest

try:
    from testcontainers.postgres import PostgresContainer
except ImportError:  # pragma: no cover
    PostgresContainer = None  # type: ignore[assignment]


@pytest.fixture(scope="session")
def postgres_dsn() -> Iterator[str]:
    if PostgresContainer is None:
        pytest.skip("testcontainers not installed")
    with PostgresContainer("postgres:16-alpine") as pg:
        url = pg.get_connection_url().replace("postgresql+psycopg2", "postgresql+psycopg")
        yield url


@pytest.fixture
def app(postgres_dsn: str, monkeypatch: pytest.MonkeyPatch):
    monkeypatch.setenv("MIMIC_DATABASE_URL", postgres_dsn)
    monkeypatch.setenv("MIMIC_ENV", "testing")
    monkeypatch.setenv("MIMIC_SECRET_KEY", "test-not-real")

    from mimic.app import create_app  # noqa: PLC0415  (must follow env mutation)
    from mimic.extensions import db  # noqa: PLC0415

    application = create_app()
    with application.app_context():
        # TODO (N6 follow-up, sprint 1): run Alembic migrations instead of
        # db.create_all() so the integration tests exercise the real schema
        # including the audit_log role grants and the F11 seed.
        db.create_all()
        yield application
        db.session.remove()
        db.drop_all()


@pytest.fixture
def client(app):
    return app.test_client()