"""Round 53 — the cancel button stops flying around.

The status bar's transfer widgets are permanent widgets, so Qt lays them out
left to right but justifies the group right: whichever one is added *last*
owns the corner and never moves, and everything before it slides whenever the
group's total width changes. The label carries the song title of the moment,
so it changes width on nearly every track — which used to drag the ✕ across
the bar, since it was added first.

So the ✕ is added last. It sits in the corner; the label absorbs the movement.
Hovering it is the one thing that may still shift the row, because the button
expands to say "cancel transfer" — trav asked for that to stay.
"""
import pytest
from PyQt6.QtCore import QEvent, QPointF
from PyQt6.QtGui import QEnterEvent

from lintunes.library_manager import LibraryManager
from lintunes.models import Library, Track
from lintunes.preferences import Preferences


def _library(tmp_path):
    media = tmp_path / "media"
    library = Library(music_folder=str(media))
    path = media / "Music" / "Artist" / "Album" / "T1.mp3"
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_bytes(b"audio")
    library.tracks[1] = Track(track_id=1, name="T1", artist="Artist",
                              location=str(path))
    return library


@pytest.fixture
def window(qapp, tmp_path, monkeypatch):
    monkeypatch.setenv("XDG_CONFIG_HOME", str(tmp_path / "config"))
    from lintunes.gui.main_window import MainWindow
    manager = LibraryManager(_library(tmp_path), tmp_path / "data")
    win = MainWindow(manager, Preferences(tmp_path / "data"))
    win.resize(1280, 800)
    win.show()
    for widget in (win._sync_label, win._sync_progress, win._sync_cancel):
        widget.show()
    qapp.processEvents()
    yield win
    win.close()


def _right_edge(widget):
    return widget.x() + widget.width()


class TestCancelButtonStaysInTheCorner:

    def test_a_longer_song_title_does_not_move_the_button(self, window, qapp):
        window._sync_label.setText("Rabbit R1 · 3/40 04 Song")
        qapp.processEvents()
        before = window._sync_cancel.x()
        window._sync_label.setText(
            "Rabbit R1 · 12/40 07 A Considerably Longer Song Title Indeed")
        qapp.processEvents()
        assert window._sync_label.width() > 0
        assert window._sync_cancel.x() == before

    def test_the_button_is_the_rightmost_of_the_three(self, window, qapp):
        window._sync_label.setText("Rabbit R1 · 3/40 04 Song")
        qapp.processEvents()
        assert (_right_edge(window._sync_label)
                <= window._sync_progress.x())
        assert (_right_edge(window._sync_progress)
                <= window._sync_cancel.x())

    def test_hovering_expands_leftwards(self, window, qapp):
        window._sync_label.setText("Rabbit R1 · 3/40 04 Song")
        qapp.processEvents()
        edge = _right_edge(window._sync_cancel)
        progress_x = window._sync_progress.x()

        narrow = window._sync_cancel.width()
        here = QPointF(1, 1)
        window._sync_cancel.enterEvent(QEnterEvent(here, here, here))
        qapp.processEvents()
        assert window._sync_cancel.width() > narrow
        assert _right_edge(window._sync_cancel) == edge
        assert window._sync_progress.x() < progress_x

        window._sync_cancel.leaveEvent(QEvent(QEvent.Type.Leave))
        qapp.processEvents()
        assert _right_edge(window._sync_cancel) == edge
        assert window._sync_progress.x() == progress_x