from agent.db import connect, ensure_database, run_migrations

EXPECTED_TABLES = {"schema_migrations", "sync_runs", "documents", "bills", "approvals"}


def test_ensure_database_creates_and_is_idempotent(cfg):
    ensure_database(cfg)
    ensure_database(cfg)  # second call must not raise
    with connect(cfg) as conn:
        assert conn.execute("SELECT 1").fetchone()[0] == 1


def test_run_migrations_applies_each_migration_exactly_once(cfg):
    ensure_database(cfg)

    first = run_migrations(cfg)
    assert first == ["0001_initial.sql"]

    second = run_migrations(cfg)
    assert second == []

    with connect(cfg) as conn:
        rows = conn.execute(
            "SELECT tablename FROM pg_tables WHERE schemaname = 'public'"
        ).fetchall()
    assert EXPECTED_TABLES <= {r[0] for r in rows}


def test_sync_runs_rejects_bad_status(cfg):
    import psycopg
    import pytest

    ensure_database(cfg)
    run_migrations(cfg)
    with connect(cfg) as conn, pytest.raises(psycopg.errors.CheckViolation):
        conn.execute(
            "INSERT INTO sync_runs (connector, started_at, status)"
            " VALUES ('x', now(), 'bogus')"
        )