"""Unit-Tests portable Pfade (PLAN.md §9, §9.1)."""

from __future__ import annotations

from pathlib import Path

from hms_launcher import AppPaths


def test_paths_are_relative_to_root(tmp_path: Path) -> None:
    paths = AppPaths(root=tmp_path)
    assert paths.app == tmp_path / "app"
    assert paths.runtime == tmp_path / "runtime"
    assert paths.gstreamer_bin == tmp_path / "runtime" / "gstreamer" / "bin"
    assert paths.gstreamer_plugins == tmp_path / "runtime" / "gstreamer" / "lib" / "gstreamer-1.0"
    assert paths.database == tmp_path / "userdata" / "database"
    assert paths.cache == tmp_path / "userdata" / "cache"
    assert paths.identity == tmp_path / "userdata" / "identity" / "node_id"
    # Keine Laufwerksbuchstaben, keine absoluten Fremdpfade
    assert not str(paths.app).startswith("C:")


def test_ensure_writable(tmp_path: Path) -> None:
    assert AppPaths(root=tmp_path).ensure_writable() is True
    assert not (tmp_path / ".write_probe").exists()  # Probe wird aufgeräumt


def test_ensure_writable_false_on_write_error(tmp_path: Path, monkeypatch) -> None:
    """Schreibfehler (z. B. schreibgeschütztes Medium) → False.

    Der Fehler wird simuliert, weil root in Containern Verzeichnisrechte
    umgeht und ein chmod-Test dort falsch grün/rot wäre.
    """
    from pathlib import Path as _Path

    def _raise_write(self, *args, **kwargs):
        raise OSError("read-only file system")

    monkeypatch.setattr(_Path, "write_text", _raise_write)
    assert AppPaths(root=tmp_path).ensure_writable() is False


def test_portable_environment_sets_gstreamer_vars(tmp_path: Path) -> None:
    paths = AppPaths(root=tmp_path)
    env = paths.portable_environment()
    assert env["GST_PLUGIN_PATH_1_0"].endswith("gstreamer-1.0")
    assert env["GST_PLUGIN_SYSTEM_PATH_1_0"] == ""  # System-Plugins unterdrückt


def test_portable_environment_prepends_bundled_bin(tmp_path: Path) -> None:
    gs_bin = tmp_path / "runtime" / "gstreamer" / "bin"
    gs_bin.mkdir(parents=True)
    env = AppPaths(root=tmp_path).portable_environment()
    assert env["PATH"].startswith(str(gs_bin))