import os
import sys
from pathlib import Path

import pytest
from sqlalchemy import create_engine
from testcontainers.postgres import PostgresContainer

# Permetti `pytest` lanciato da qualsiasi directory di trovare il package `nsp`
# (installato in modalità editable nella venv, ma utile anche senza attivazione).
_ROOT = Path(__file__).resolve().parent.parent
if str(_ROOT) not in sys.path:
    sys.path.insert(0, str(_ROOT))

# Directory sessions/ risolta relativamente alla root harness (per i test che creano sessioni)
os.environ.setdefault("NSP_HARNESS_ROOT", str(_ROOT))


# --- L0 fixtures (testcontainers, real Postgres) --------------------------------
# Session-scoped: un solo container per tutta la run L0. Schema fixture caricato una
# volta (crea schema dw + dati + ruolo psd_ro read-only). Salta automaticamente se
# Docker non e' disponibile.

@pytest.fixture(scope="session")
def pg_container():
    with PostgresContainer("postgres:16-alpine") as pg:
        yield pg


@pytest.fixture(scope="session")
def admin_engine(pg_container):
    engine = create_engine(pg_container.get_connection_url())
    schema_sql = (Path(__file__).parent / "fixtures" / "schema.sql").read_text()
    with engine.begin() as conn:
        conn.exec_driver_sql(schema_sql)
    yield engine
    engine.dispose()


@pytest.fixture(scope="session")
def ro_url(pg_container, admin_engine) -> str:
    host = pg_container.get_container_host_ip()
    port = pg_container.get_exposed_port(5432)
    return f"postgresql+psycopg2://psd_ro:psd_ro@{host}:{port}/{pg_container.dbname}"