# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
"""The mutable box: a swap that works, and one that must not take the bot down."""

from __future__ import annotations

import json
from typing import TYPE_CHECKING

from signal_bot.pack_holder import PackHolder
from signal_bot.pack_load import load
from tests import pack_fixture

if TYPE_CHECKING:
    from pathlib import Path

    import pytest


def test_a_reload_publishes_what_is_now_on_disk(tmp_path: Path) -> None:
    root = pack_fixture.build(tmp_path / "pack")
    holder = PackHolder(load(root))
    assert holder.pack.matching(frozenset({"p3"})) == ("gamma.png",)

    (root / "media" / "extra.png").write_bytes(pack_fixture.PIXEL)
    tags = json.loads((root / "tags.json").read_text(encoding="utf-8"))
    tags["extra.png"] = ["p3"]
    (root / "tags.json").write_text(json.dumps(tags), encoding="utf-8")

    assert holder.reload() is True
    assert holder.pack.matching(frozenset({"p3"})) == ("extra.png", "gamma.png")


def test_a_pack_that_no_longer_loads_keeps_the_old_one_and_does_not_raise(
    tmp_path: Path, caplog: pytest.LogCaptureFixture
) -> None:
    """Restart=always turns a raised ConfigError into a restart loop."""
    root = pack_fixture.build(tmp_path / "pack")
    holder = PackHolder(load(root))
    before = holder.pack

    # Half a write: exactly what a page interrupted mid-save leaves behind.
    # (A tag naming a vanished file used to be the example here; since
    # 2026-09-04 that is skipped with a warning rather than refused.)
    (root / "tags.json").write_text('{"alfa.png": ["p1"', encoding="utf-8")

    assert holder.reload() is False
    assert holder.pack is before
    assert holder.pack.matching(frozenset({"p1"})) == ("alfa.png", "both.png", "clip.mp4")
    assert "no longer loads" in caplog.text


def test_the_holder_reloads_from_the_directory_it_already_has(tmp_path: Path) -> None:
    root = pack_fixture.build(tmp_path / "pack")
    holder = PackHolder(load(root))
    assert holder.reload() is True
    assert holder.pack.directory == root