"""Slave GUI chat: newest-first transcript and fullscreen chat mode (offscreen Qt)."""
from __future__ import annotations

import os
import sys
from pathlib import Path

import pytest

os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")

SLAVE_SRC = Path(__file__).resolve().parents[1] / "javis-slave" / "src"
if str(SLAVE_SRC) not in sys.path:
    sys.path.insert(0, str(SLAVE_SRC))

QtWidgets = pytest.importorskip("PySide6.QtWidgets")
QtTest = pytest.importorskip("PySide6.QtTest")

from javis_slave import main_window  # noqa: E402


@pytest.fixture(scope="module")
def qapp():
    return QtWidgets.QApplication.instance() or QtWidgets.QApplication([])


@pytest.fixture
def screen(qapp):
    scr = main_window.MainScreen()
    scr.resize(900, 700)
    scr.show()
    yield scr
    scr.close()


def _texts(scr) -> list[str]:
    """Bubble texts from the top of the transcript to the bottom."""
    layout = scr.transcript_layout
    out = []
    for i in range(layout.count()):
        row = layout.itemAt(i).widget()
        if row is not None:
            out.append(row.findChild(QtWidgets.QLabel).text())
    return out


def test_newest_message_is_on_top(screen):
    screen.set_turn("frage 1", "antwort 1")
    screen.set_turn("frage 2", "antwort 2")
    screen.show_error("kaputt")
    assert _texts(screen) == [
        "⚠ kaputt", "antwort 2", "frage 2", "antwort 1", "frage 1"]


def test_prune_drops_oldest_at_the_bottom(screen):
    for i in range(30):
        screen.set_turn(f"u{i}", f"a{i}")
    texts = _texts(screen)
    assert len(texts) == 40
    assert texts[0] == "a29"
    assert "u0" not in texts and "u29" in texts


def test_scrolls_to_top_on_new_message(screen):
    for i in range(12):
        screen.set_turn(f"u{i}", "x " * 200)
    QtTest.QTest.qWait(150)  # lets the layout settle (and the first auto-scroll fire)
    vbar = screen.transcript_scroll.verticalScrollBar()
    assert vbar.maximum() > 0
    vbar.setValue(vbar.maximum())
    screen.set_turn("neu", "neu")
    QtTest.QTest.qWait(150)  # the scroll is deferred by a 50 ms timer
    assert vbar.value() == vbar.minimum()


def test_fullscreen_button_goes_fullscreen_and_keeps_orb_and_chat_visible(qapp):
    win = main_window.SlaveWindow()
    win.show_main()
    win.show()
    scr = win.main_screen
    scr.set_turn("frage", "antwort")
    try:
        assert not win.isFullScreen()
        assert scr.expand_btn.toolTip() == "Vollbild"

        scr.expand_btn.click()
        QtTest.QTest.qWait(50)
        assert win.isFullScreen()
        assert scr.orb.isVisible() and scr.transcript_scroll.isVisible()
        assert scr.expand_btn.toolTip() == "Vollbild beenden"

        scr.expand_btn.click()
        QtTest.QTest.qWait(50)
        assert not win.isFullScreen()
        assert scr.orb.isVisible() and scr.transcript_scroll.isVisible()
        assert scr.expand_btn.toolTip() == "Vollbild"
    finally:
        win.close()


def test_esc_and_f11_keep_button_in_sync(qapp):
    win = main_window.SlaveWindow()
    win.show_main()
    win.show()
    try:
        win._toggle_fullscreen()  # F11
        QtTest.QTest.qWait(50)
        assert win.isFullScreen() and win.main_screen.expand_btn.toolTip() == "Vollbild beenden"

        win._leave_fullscreen()  # Esc
        QtTest.QTest.qWait(50)
        assert not win.isFullScreen() and win.main_screen.expand_btn.toolTip() == "Vollbild"
    finally:
        win.close()

def test_expand_icons_render(qapp):
    for kind in ("expand", "collapse"):
        img = main_window._icon(kind, "#cccccc", 26).pixmap(26, 26).toImage()
        assert any(img.pixelColor(x, y).alpha() > 0
                   for x in range(img.width()) for y in range(img.height()))