import pytest
import importlib.util
import sys
import types
from pathlib import Path


def _load_leakage_identifier():
    algorithms_package = types.ModuleType("app.algorithms")
    algorithms_package.__path__ = []
    utils_module = types.ModuleType("app.algorithms._utils")
    utils_module._cleanup_temp_files = lambda *args, **kwargs: None
    sys.modules["app.algorithms"] = algorithms_package
    sys.modules["app.algorithms._utils"] = utils_module

    module_path = (
        Path(__file__).resolve().parents[2]
        / "app"
        / "algorithms"
        / "leakage"
        / "identifier.py"
    )
    spec = importlib.util.spec_from_file_location(
        "tests_leakage_identifier_under_test", module_path
    )
    module = importlib.util.module_from_spec(spec)
    assert spec and spec.loader
    spec.loader.exec_module(module)
    return module.LeakageIdentifier


@pytest.mark.parametrize(
    ("unit", "expected"),
    [
        ("m3/s", 1.0),
        ("m³/s", 1.0),
        ("m3/h", 3600.0),
        ("m³/h", 3600.0),
    ],
)
def test_leakage_identifier_accepts_display_flow_units(unit, expected):
    LeakageIdentifier = _load_leakage_identifier()

    assert LeakageIdentifier._flow_from_m3s(1.0, unit) == expected


def test_leakage_identifier_accepts_display_flow_units_for_input():
    LeakageIdentifier = _load_leakage_identifier()

    assert LeakageIdentifier._flow_to_m3s(3600.0, "m³/h") == 1.0