import ctypes
import platform
from pathlib import Path

import pytest

from app.native.wndb.model import status


def test_epanet2_preserves_valve_setting_without_emitting_active(monkeypatch):
    monkeypatch.setattr(status, "read_all", lambda *_: [
        {"link": "V1", "status": "ACTIVE", "setting": None},
        {"link": "V2", "status": "ACTIVE", "setting": 2.5},
        {"link": "V3", "status": "CLOSED", "setting": None},
        {"link": "P1", "status": "OPEN", "setting": 0},
    ])
    assert status.inp_out_status("model") == ["V2 2.5", "V3 CLOSED", "P1 OPEN", "P1 0"]


def test_epanet3_retains_explicit_active_status(monkeypatch):
    monkeypatch.setattr(status, "read_all", lambda *_: [
        {"link": "V1", "status": "ACTIVE", "setting": 100},
    ])
    assert status.inp_out_status("model", version="3") == ["V1 ACTIVE", "V1 100"]


@pytest.mark.parametrize("version", ["2", "3"])
def test_file_and_text_exporters_forward_the_selected_format(monkeypatch, tmp_path, version):
    from app.native.wndb.inp import exporter

    monkeypatch.setattr(exporter, "have_project", lambda _: True)
    monkeypatch.setattr(exporter, "section_name", [exporter.STATUS])
    monkeypatch.setattr(exporter, "section_names_for_epanetv2", [exporter.STATUS])
    monkeypatch.setattr(status, "read_all", lambda *_: [
        {"link": "V1", "status": "ACTIVE", "setting": 100},
    ])
    path = tmp_path / "model.inp"
    exporter.dump_inp("model", str(path), version)
    text = exporter.export_inp("model", version).operations[0]["inp"]
    assert "V1 100" in path.read_text() and "V1 100" in text
    assert ("V1 ACTIVE" in path.read_text()) == (version == "3")
    assert ("V1 ACTIVE" in text) == (version == "3")


def test_exported_active_valve_passes_bundled_epanet2_input_validation(monkeypatch, tmp_path):
    library = Path(__file__).resolve().parents[2] / "app/infra/epanet/linux/libepanet2.so"
    if platform.system() != "Linux" or not library.exists():
        pytest.skip("Bundled Linux EPANET library is unavailable")
    monkeypatch.setattr(status, "read_all", lambda *_: [
        {"link": "551711", "status": "ACTIVE", "setting": None},
    ])
    inp = tmp_path / "valve.inp"
    inp.write_text(
        "[JUNCTIONS]\nJ1 0 1\nJ2 0 1\n[RESERVOIRS]\nR1 100\n"
        "[PIPES]\nP1 R1 J1 100 300 100 0 OPEN\n"
        "[VALVES]\n551711 J1 J2 600 TCV 100 0\n[STATUS]\n"
        + "\n".join(status.inp_out_status("model"))
        + "\n[OPTIONS]\nUNITS LPS\n[END]\n"
    )
    lib = ctypes.CDLL(str(library))
    lib.EN_createproject.argtypes = [ctypes.POINTER(ctypes.c_void_p)]
    lib.EN_open.argtypes = [ctypes.c_void_p, ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p]
    lib.EN_deleteproject.argtypes = [ctypes.c_void_p]
    handle = ctypes.c_void_p()
    assert lib.EN_createproject(ctypes.byref(handle)) == 0
    try:
        code = lib.EN_open(handle, str(inp).encode(), str(tmp_path / "valve.rpt").encode(), b"")
        assert code == 0
    finally:
        lib.EN_deleteproject(handle)