"""Tests for reporting failed model downloads instead of swallowing them."""

import importlib
import sys
from unittest.mock import MagicMock, Mock, patch

import pytest


def _load_settings_dialog():
    """Import settings_dialog with real base classes for its GTK subclasses.

    conftest swaps gi for a MagicMock, which leaves every ``class X(Gtk.Y)`` in
    the module as a mock and makes its methods unreachable. Handing the three
    bases the module subclasses a real class keeps the classes intact, while
    the rest of GTK stays mocked.

    Restore both sys.modules and the vocalinux.ui.settings_dialog attribute so
    3.9/3.10 mock and later imports see the same module object.
    """
    import vocalinux.ui as ui_pkg

    repository = sys.modules["gi.repository"]
    bases = {name: type(name, (), {}) for name in ("Box", "ListBoxRow", "Dialog")}
    saved = sys.modules.pop("vocalinux.ui.settings_dialog", None)
    try:
        with patch.object(repository, "Gtk", MagicMock(**bases)):
            module = importlib.import_module("vocalinux.ui.settings_dialog")
    finally:
        sys.modules.pop("vocalinux.ui.settings_dialog", None)
        if saved is not None:
            sys.modules["vocalinux.ui.settings_dialog"] = saved
            ui_pkg.settings_dialog = saved
        else:
            ui_pkg.__dict__.pop("settings_dialog", None)
    return module


settings_dialog = _load_settings_dialog()
SettingsDialog = settings_dialog.SettingsDialog


def _dialog_stub():
    dialog = Mock()
    dialog.speech_engine.state = "idle"
    return dialog


def test_download_threads_get_the_failure():
    """With raise_errors the caller's handler sees the exception.

    The download threads rely on this: their except blocks turn the failure
    into set_complete(False, reason) on the progress dialog. Without it they
    reported "Complete!" for downloads that were cancelled or never finished.
    """
    dialog = _dialog_stub()
    dialog.speech_engine.reconfigure.side_effect = RuntimeError("Download cancelled")

    with pytest.raises(RuntimeError, match="Download cancelled"):
        SettingsDialog._apply_settings_internal(dialog, {"engine": "vosk"}, raise_errors=True)


def test_no_gtk_dialog_is_built_when_errors_are_raised():
    """The failing thread path must not touch Gtk — that is the caller's job.

    Building and running a Gtk.MessageDialog off the main loop is what the
    swallowed-error path used to do from the download thread.
    """
    dialog = _dialog_stub()
    dialog.speech_engine.reconfigure.side_effect = RuntimeError("boom")

    with patch.object(settings_dialog, "Gtk") as gtk:
        with pytest.raises(RuntimeError):
            SettingsDialog._apply_settings_internal(dialog, {"engine": "vosk"}, raise_errors=True)

    gtk.MessageDialog.assert_not_called()


def test_main_loop_callers_keep_the_dialog_and_the_false_return():
    """Without the flag the old contract stays: swallow, show, return False."""
    dialog = _dialog_stub()
    dialog.speech_engine.reconfigure.side_effect = RuntimeError("boom")

    with patch.object(settings_dialog, "Gtk") as gtk:
        result = SettingsDialog._apply_settings_internal(dialog, {"engine": "vosk"})

    assert result is False
    gtk.MessageDialog.assert_called_once()


def test_success_still_returns_true():
    dialog = _dialog_stub()

    assert SettingsDialog._apply_settings_internal(dialog, {"engine": "vosk"}) is True
    assert (
        SettingsDialog._apply_settings_internal(dialog, {"engine": "vosk"}, raise_errors=True)
        is True
    )


def test_both_download_threads_ask_for_the_failure() -> None:
    """Source guard: every _apply_settings_internal call made off the main loop
    passes raise_errors=True, so a regression cannot silently reintroduce the
    swallowed-error path on a worker thread. The two download workers must
    also force the engine re-init — their apply exists because a model is
    missing, and a no-op reconfigure would report the green "Model ready to
    use" for a download that never ran. Each call site is checked on its own
    worker: a bare count would still pass if the flag moved between call
    sites, and the already-downloaded worker must never force it."""
    import ast
    import inspect

    def worker_kwargs(worker: ast.FunctionDef) -> dict:
        calls = [
            node
            for node in ast.walk(worker)
            if isinstance(node, ast.Call)
            and isinstance(node.func, ast.Attribute)
            and node.func.attr == "_apply_settings_internal"
        ]
        assert len(calls) == 1, "each worker applies settings exactly once"
        return {
            kw.arg: kw.value.value if isinstance(kw.value, ast.Constant) else None
            for kw in calls[0].keywords
            if kw.arg is not None
        }

    tree = ast.parse(inspect.getsource(settings_dialog))
    functions = [node for node in ast.walk(tree) if isinstance(node, ast.FunctionDef)]

    download_workers = [node for node in functions if node.name == "download_and_apply"]
    assert len(download_workers) == 2
    for worker in download_workers:
        kwargs = worker_kwargs(worker)
        assert kwargs.get("raise_errors") is True
        assert kwargs.get("force_reinit") is True

    already_downloaded = [node for node in functions if node.name == "apply_already_downloaded"]
    assert len(already_downloaded) == 1
    kwargs = worker_kwargs(already_downloaded[0])
    assert kwargs.get("raise_errors") is True
    assert "force_reinit" not in kwargs


def test_force_reinit_reaches_reconfigure() -> None:
    """The flag exists so a needed download cannot no-op its way to green."""
    dialog = _dialog_stub()

    assert (
        SettingsDialog._apply_settings_internal(dialog, {"engine": "vosk"}, force_reinit=True)
        is True
    )
    dialog.speech_engine.reconfigure.assert_called_once_with(force_reinit=True, engine="vosk")