"""The RTC copy-write E2E may touch ONLY the disposable scratch copy; every real database path must be refused before any connection is opened."""
import importlib.util
import sys
from pathlib import Path

import pytest

ROOT = Path(__file__).resolve().parents[1]


def _load():
    sys.path.insert(0, str(ROOT / "scripts")); sys.path.insert(0, str(ROOT / "agent" / "src"))
    spec = importlib.util.spec_from_file_location("rtc_copy_write_e2e", ROOT / "scripts" / "rtc_copy_write_e2e.py")
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


def test_guard_accepts_only_the_exact_scratch_copy_and_refuses_real_databases():
    module = _load()
    module.guard(module.COPY)                                                     # the copy itself is fine
    for path in (ROOT / "TESTESOFICIAIS.FDB", ROOT / "Banco" / "CONSTRUCAO.FDB", ROOT / "Banco" / "RINCAO.FDB", ROOT / "scratch_rtc_e2e" / "OTHER.FDB", Path("D:/PROJETOS/GTISISTEMAS/Banco/GTI.FDB")):
        with pytest.raises(SystemExit):
            module.guard(str(path))
    assert "scratch_rtc_e2e" in module.COPY


def test_the_e2e_script_only_ever_connects_to_the_copy():
    text = (ROOT / "scripts" / "rtc_copy_write_e2e.py").read_text(encoding="utf-8")
    assert text.count("fdb.connect(") == 1 and "database=COPY" in text          # the single connection helper is bound to the copy path