"""Round 69: the header row moves up into the seek row's band.

The Library button, the view's header (search box or playlist name) and the
seek row share one row under the transport boxes: the Library button as wide
as the sidebar, the header where the view starts, the seek row exactly under
the now-playing panel. The panel stops at NOW_PLAYING_MAX and the gaps between
the controls share what's left.
"""

from PyQt6.QtCore import QPoint

from lintunes.gui.fit_label import FitLabel
from lintunes.gui.main_window import MainWindow
from lintunes.gui.transport import NOW_PLAYING_MIN
from lintunes.library_manager import LibraryManager
from lintunes.models.library import Library
from lintunes.models.playlist import Playlist
from lintunes.models.track import Track
from lintunes.preferences import Preferences


def _window(qapp, tmp_path, width=1280):
    library = Library(tracks={1: Track(track_id=1, name="One")})
    library.playlists["abcd1234"] = Playlist(
        persistent_id="abcd1234", name="Road Trip", track_ids=[1])
    window = MainWindow(LibraryManager(library, tmp_path), Preferences(tmp_path))
    window.resize(width, 500)
    window.show()
    qapp.processEvents()
    return window


def _x(widget, window, x=0):
    return widget.mapTo(window, QPoint(x, 0)).x()


def _gx(widget, x=0):
    return widget.mapToGlobal(QPoint(x, 0)).x()


def test_startup_still_opens_on_the_library(qapp, tmp_path):
    # The moved Library button fell to the end of the focus chain, the tree
    # took the first focus and selected its first playlist.
    window = _window(qapp, tmp_path)
    assert window._content.currentWidget() is window._library_view
    assert window._sidebar.library_button.isChecked()


def test_library_button_spans_the_playlist_list(qapp, tmp_path):
    # Edge to edge with the list below it, scrollbar included, with bare
    # window to the left of both.
    window = _window(qapp, tmp_path)
    header = window.sidebar.header
    lists = window.sidebar.list_area
    # The frame around the playlists takes in the album art too.
    assert window.sidebar.art.parentWidget() is lists
    assert header.parentWidget() is not window.sidebar
    assert _gx(header) == _gx(lists) > _gx(window)
    assert header.width() == lists.width()
    button = window.sidebar.library_button
    assert _gx(button) == _gx(lists)
    assert _gx(button, button.width()) == _gx(lists, lists.width())


def test_header_row_items_share_one_floor(qapp, tmp_path):
    from lintunes.gui.transport import HeaderRow
    window = _window(qapp, tmp_path)
    row = window._transport._header_row
    floor = row.height() - HeaderRow.BOTTOM

    def bottom(widget):
        return widget.mapTo(row, QPoint(0, widget.height())).y()

    assert bottom(window.sidebar.library_button) == floor
    assert bottom(window._library_view._search) == floor
    # Text and the playhead sit LIFT px up, on the button's bottom line by eye.
    assert bottom(window._transport._slider) == floor - HeaderRow.LIFT
    window._show_playlist("abcd1234")
    qapp.processEvents()
    label = window._playlist_view.header
    baseline = bottom(label) - label.fontMetrics().descent()
    assert abs(baseline - (floor - HeaderRow.LIFT)) <= 1


def test_search_then_title_sit_where_the_view_starts(qapp, tmp_path):
    window = _window(qapp, tmp_path)
    search_strip = window._library_view.header
    assert search_strip.isVisible()
    assert _gx(search_strip) == _gx(window._content)

    window._show_playlist("abcd1234")
    qapp.processEvents()
    label = window._playlist_view.header
    assert label.isVisible() and label.full_text() == "Road Trip"
    assert _gx(label) == _gx(window._content)
    # The search strip went home to its view, hidden.
    assert not search_strip.isVisible()
    assert search_strip.parentWidget() is window._library_view


def test_header_row_shares_the_seek_band(qapp, tmp_path):
    window = _window(qapp, tmp_path)
    bar = window._transport
    panel = bar._now_playing
    seek = bar._slider.parentWidget()
    # Under the panel, edge to edge, and level with the Library button.
    assert _gx(seek) == _gx(panel)
    assert seek.width() == panel.width()
    library = window.sidebar.library_button
    row = bar._header_row
    assert row.geometry().top() > panel.geometry().bottom()
    assert library.mapTo(bar, QPoint()).y() >= row.geometry().top()


def test_panel_scales_with_the_window(qapp, tmp_path):
    window = _window(qapp, tmp_path, width=1920)
    bar = window._transport
    assert abs(bar._now_playing.width() - 700) <= 1
    window.resize(800, 500)
    qapp.processEvents()
    assert NOW_PLAYING_MIN <= bar._now_playing.width() < 700
    bpm = bar._bpm_button.parentWidget()
    assert bar._now_playing.geometry().right() < bpm.geometry().left()
    assert bpm.geometry().right() < bar.width()


def test_views_seek_row_never_overlaps_the_header(qapp, tmp_path):
    window = _window(qapp, tmp_path, width=800)
    strip = window._library_view.header
    seek = window._transport._slider.parentWidget()
    assert _gx(strip, strip.width()) <= _gx(seek)


def test_long_name_shrinks_then_elides(qapp):
    label = FitLabel()
    base = label.font().pointSize()
    label.resize(120, 30)
    label.setText("A short one")
    assert label.text() == "A short one"
    label.setText("An Extraordinarily Long Playlist Name That Goes On Forever")
    assert label.font().pointSize() >= base - 2
    assert label.text().endswith("…")
    assert label.toolTip() == label.full_text()


def test_row_is_knolled_with_equal_gaps_and_ends(qapp, tmp_path):
    from lintunes.gui.transport import MIN_GAP
    window = _window(qapp, tmp_path)
    bar = window._transport
    for width in (900, 1280, 1920):
        window.resize(width, 500)
        qapp.processEvents()
        row = [bar._prev_btn.parentWidget(), bar._shuffle_btn.parentWidget(),
               bar._visualizer, bar._volume_slider, bar._now_playing,
               bar._bpm_button.parentWidget()]
        edges = [(w.geometry().left(), w.geometry().right()) for w in row]
        gaps = [b[0] - a[1] - 1 for a, b in zip(edges, edges[1:])]
        assert max(gaps) - min(gaps) <= 1
        assert gaps[0] >= MIN_GAP
        # The ends get the same space as the gaps: the row floats.
        left_end, right_end = edges[0][0], bar.width() - 1 - edges[-1][1]
        for end in (left_end, right_end):
            assert abs(end - gaps[0]) <= 7