"""Tests for `_page_is_shared`.

This function decides whether a page is exposed over Reticulum to
subscribers. Getting it wrong means either a privacy leak or silently
hiding pages the user meant to share — both are worth a regression net.
"""
import pytest

from handlers import _page_is_shared


@pytest.mark.parametrize("mode", ["exclude_private", "require_public"])
def test_private_tag_always_excludes(mode):
    """`private` tag overrides every mode — the most important invariant."""
    assert _page_is_shared(["private"], mode) is False
    assert _page_is_shared(["public", "private"], mode) is False


def test_exclude_private_defaults_to_shared():
    assert _page_is_shared([], "exclude_private") is True
    assert _page_is_shared(["random-tag"], "exclude_private") is True


def test_require_public_needs_public_tag():
    assert _page_is_shared([], "require_public") is False
    assert _page_is_shared(["rust"], "require_public") is False
    assert _page_is_shared(["public"], "require_public") is True


def test_require_public_still_vetoes_private():
    # public AND private → private wins.
    assert _page_is_shared(["public", "private"], "require_public") is False


def test_unknown_mode_treated_as_exclude_private():
    """The default mode is 'exclude_private'; unknown modes fall through to it."""
    assert _page_is_shared([], "totally-bogus-mode") is True
    assert _page_is_shared(["private"], "totally-bogus-mode") is False