"""UI가 실제로 만들어지고 자막이 그려지는지 확인한다 (offscreen 렌더링)."""

from __future__ import annotations

import os

import pytest

pytest.importorskip("PySide6")
os.environ.setdefault("QT_QPA_PLATFORM", "offscreen")

from PySide6.QtGui import QImage, QPainter  # noqa: E402
from PySide6.QtWidgets import QApplication  # noqa: E402

from hearo.config import AppConfig  # noqa: E402
from hearo.core.events import EngineState, EngineStatus, TranslationLine  # noqa: E402
from hearo.ui.main_window import MainWindow  # noqa: E402
from hearo.ui.overlay import paint_subtitle  # noqa: E402


@pytest.fixture(scope="session")
def qapp():
    app = QApplication.instance() or QApplication([])
    yield app


@pytest.fixture
def window(qapp, tmp_path, monkeypatch):
    monkeypatch.setattr("hearo.constants.user_data_dir", lambda: tmp_path)
    config = AppConfig()
    config.models.preload_on_start = False
    config.glossary.path = str(tmp_path / "glossary.json")
    win = MainWindow(config)
    yield win
    win.engine.shutdown()
    win.overlay.close()
    win.close()


def test_main_window_builds_all_pages(window):
    assert window.stack.count() == 5


def test_navigation_switches_pages(window):
    for index in range(5):
        window._goto_page(index)
        assert window.stack.currentIndex() == index


def test_status_updates_toggle_button(window):
    window._on_status(EngineStatus(EngineState.RUNNING, "듣는 중"))
    assert window.home_page.toggle_button.text() == "번역 정지"
    window._on_status(EngineStatus(EngineState.IDLE, "대기 중"))
    assert window.home_page.toggle_button.text() == "번역 시작"


def test_final_line_reaches_overlay_and_log(window):
    window.config.log_transcripts = False
    window._on_line(
        TranslationLine("hello", "안녕하세요", "en", "ko", is_final=True, latency_s=1.2)
    )
    assert window.overlay._final_text == "안녕하세요"
    assert window.home_page.log_list.count() == 1


def test_partial_line_is_not_logged(window):
    window.config.log_transcripts = False
    window._on_line(TranslationLine("hel", "", "en", "ko", is_final=False))
    assert window.home_page.log_list.count() == 0


def test_tier_selection_updates_config(window):
    window.models_page._on_tier_selected(window.models_page._cards[3].tier)
    assert window.config.models.tier == "precision"


def test_subtitle_style_edit_propagates(window):
    window.subtitle_page.size_spin.setValue(60)
    assert window.config.subtitle.font_size == 60


def test_paint_subtitle_actually_draws_pixels(qapp):
    """자막 글씨가 투명 이미지 위에 실제로 그려지는지 (빈 화면이면 실패).

    배경 상자가 픽셀을 채워버리면 글씨 유무를 알 수 없으므로 배경은 끄고 잰다.
    """
    st = AppConfig().subtitle
    st.background_opacity = 0
    image = QImage(900, 200, QImage.Format.Format_ARGB32)
    image.fill(0)

    painter = QPainter(image)
    paint_subtitle(painter, image.rect(), st, "안녕하세요 반갑습니다", "Hello there")
    painter.end()

    non_transparent = sum(
        1
        for y in range(0, image.height(), 4)
        for x in range(0, image.width(), 4)
        if image.pixelColor(x, y).alpha() > 0
    )
    assert non_transparent > 100