import pytest

# Redirect QSettings to a throwaway dir BEFORE any MainWindow is constructed, so
# these GUI tests can never read or clobber the user's real ~/.config/8cut.conf
# (constructing MainWindow loads — and on window close re-saves — the playlist
# tabs; a test mutating tab state would otherwise persist into the real session).
import tempfile as _tempfile
from PyQt6.QtCore import QSettings as _QSettings
_QS_DIR = _tempfile.mkdtemp(prefix="8cut-test-qs-")
_QSettings.setPath(_QSettings.Format.NativeFormat, _QSettings.Scope.UserScope, _QS_DIR)
_QSettings.setPath(_QSettings.Format.IniFormat, _QSettings.Scope.UserScope, _QS_DIR)

# A real platform is needed because MpvWidget creates a GL context.
# If construction fails for any environment reason, skip — this test is a
# best-effort structural net, not a gate on core/ tests.
pytestmark = pytest.mark.gui


@pytest.fixture(scope="module")
def app():
    from PyQt6.QtWidgets import QApplication
    inst = QApplication.instance() or QApplication([])
    yield inst


@pytest.fixture
def win(app):
    try:
        from main import MainWindow
        w = MainWindow()
    except Exception as e:  # GL/mpv/display unavailable, etc.
        pytest.skip(f"MainWindow could not be constructed here: {e}")
    # Deterministic deck state regardless of any persisted side-by-side layout
    # (construction restores deck_pinned from QSettings).
    for _p in w._deck_panels:
        _p._pinned = False
    w._refresh_deck_layout()
    yield w
    w.close()
    w.deleteLater()


def test_window_constructs(win):
    assert win.windowTitle().startswith("8-cut")


def test_status_bar_exists(win):
    assert win.statusBar() is not None


def test_workers_spinbox_in_export_tab(win):
    from PyQt6.QtWidgets import QSpinBox
    assert win._spn_workers in win._tab_export.findChildren(QSpinBox)


def test_scan_button_in_scan_tab(win):
    from PyQt6.QtWidgets import QPushButton
    assert win._btn_scan in win._tab_scan.findChildren(QPushButton)


def test_portrait_combo_in_crop_tab(win):
    from PyQt6.QtWidgets import QComboBox
    assert win._cmb_portrait in win._tab_crop.findChildren(QComboBox)


def test_menu_only_buttons_not_in_deck(win):
    from PyQt6.QtWidgets import QPushButton
    deck_btns = win._control_deck.findChildren(QPushButton)
    assert win._btn_train not in deck_btns
    assert win._btn_scan_all not in deck_btns
    assert win._btn_hide_subcats not in deck_btns


def test_deck_stack_exists(win):
    # The deck is wrapped in a stack so it can swap tabbed <-> side-by-side.
    # Default (nothing pinned) shows the tabbed control deck.
    assert win._deck_stack is not None
    assert win._deck_stack.currentWidget() is win._control_deck


def _split_columns(win):
    """Widgets of the splitter actually mounted in the layout (not findChild,
    which can return a stale deleteLater'd splitter)."""
    from PyQt6.QtWidgets import QSplitter
    item = win._deck_split_layout.itemAt(0)
    spl = item.widget() if item else None
    assert isinstance(spl, QSplitter)
    return [spl.widget(i) for i in range(spl.count())]


def test_pinning_two_panels_shows_exactly_two_columns(win):
    # Pin two panels directly (avoid the toggle handler so no QSettings write
    # leaks into other test windows) and refresh.
    from PyQt6.QtWidgets import QTabWidget
    win._tab_export._pinned = True
    win._tab_crop._pinned = True
    win._refresh_deck_layout()
    assert win._deck_stack.currentWidget() is win._deck_split_container
    cols = _split_columns(win)
    assert len(cols) == 2                                    # only the pinned ones
    assert not any(isinstance(c, QTabWidget) for c in cols)  # no leftover tab-column


def test_side_by_side_menu_pins_third_panel(win):
    # In split mode the View ▸ Side-by-side menu is the way to pin a 3rd panel
    # (there's no tab bar to right-click). Suppress the QSettings save via the
    # _deck_loading guard so this doesn't leak into other windows.
    win._tab_export._pinned = True
    win._tab_scan._pinned = True
    win._refresh_deck_layout()
    assert len(_split_columns(win)) == 2
    act = next(a for a, p in win._deck_pin_actions if p is win._tab_crop)
    win._deck_loading = True            # suppress _save_deck_layout
    try:
        act.trigger()                   # simulate clicking the menu item
    finally:
        win._deck_loading = False
    assert win._tab_crop._pinned is True
    assert len(_split_columns(win)) == 3


def test_duplicate_tab(win):
    # Right-click → Duplicate tab: clones files into a new tab with an adapted
    # name + adapted own folder, no file moves. Suppress QSettings writes via
    # _loading_tabs so the test can't touch the real session.
    win._loading_tabs = True
    try:
        src = win._pws[0]
        src._label = "AlexisCrystal"
        src._dest_folder = "/data/alexis"
        n_before = len(win._pws)
        win._on_duplicate_tab(win._playlist_tabs.indexOf(src))
    finally:
        win._loading_tabs = False
    assert len(win._pws) == n_before + 1
    dup = win._pws[-1]
    assert dup._label == "AlexisCrystal copy"
    assert dup._dest_folder == "/data/alexis_copy"