"""A plugin enabled while Steward runs is loaded live; one that can't be is
recorded with its reason, so its settings page says why and offers a restart
instead of a bare "Enabled, not loaded" (#6087)."""
from __future__ import annotations

import sys
from types import SimpleNamespace

import pytest

from steward.core import plugin_manager as pm


@pytest.fixture(autouse=True)
def clean_registries(monkeypatch):
    monkeypatch.setattr(pm, "_LOADED_PLUGINS", set())
    monkeypatch.setattr(pm, "_FAILED_PLUGINS", {})
    monkeypatch.setattr(pm, "_PLUGIN_NAV", [])
    monkeypatch.setattr(pm, "_PLUGIN_MODULES", {})
    yield
    for key in [k for k in sys.modules if k.startswith("_steward_plugin_hl_")]:
        sys.modules.pop(key)


def _app(root):
    return SimpleNamespace(config={"PLUGIN_DIRS": [str(root)], "PLUGINS": {}},
                           _task_registry=[], mcp_server=None)


def _plugin(root, name, *, yaml_name=None, setup_body="pass"):
    pdir = root / name
    pdir.mkdir(parents=True)
    (pdir / "plugin.yaml").write_text(f"name: {yaml_name or name}\nversion: 1.0.0\n")
    (pdir / "__init__.py").write_text(
        f"def setup(app):\n    {setup_body}\n\n"
        "def get_scheduled_tasks():\n    return []\n")


def test_a_plugin_that_cannot_load_live_is_recorded_with_its_reason(tmp_path):
    _plugin(tmp_path, "hl_broken", setup_body="raise RuntimeError('no controller')")
    ok, message = pm.hot_reload_plugin(_app(tmp_path), "hl_broken")
    assert not ok
    assert pm.get_plugin_failures() == {"hl_broken": "setup() raised: no controller"}
    assert "hl_broken" not in pm._LOADED_PLUGINS


def test_an_early_refusal_is_recorded_too(tmp_path):
    _plugin(tmp_path, "hl_misnamed", yaml_name="other")
    ok, _ = pm.hot_reload_plugin(_app(tmp_path), "hl_misnamed")
    assert not ok and "name mismatch" in pm.get_plugin_failures()["hl_misnamed"]


def test_a_plugin_that_loads_clears_an_earlier_failure(tmp_path):
    _plugin(tmp_path, "hl_good")
    pm._FAILED_PLUGINS["hl_good"] = "setup() raised: earlier"
    ok, _ = pm.hot_reload_plugin(_app(tmp_path), "hl_good")
    assert ok
    assert "hl_good" in pm._LOADED_PLUGINS and pm.get_plugin_failures() == {}


def test_enabling_one_already_running_is_a_success_not_a_failure(tmp_path):
    pm._LOADED_PLUGINS.add("hl_running")
    ok, _ = pm.hot_reload_plugin(_app(tmp_path), "hl_running")
    assert ok and pm.get_plugin_failures() == {}