"""Tests for src/pygui/backend/visualization/wafer_map_item.py."""
from unittest.mock import MagicMock

import pytest

# Use the session-scoped qapp fixture from conftest.py so Qt Property/Signal
# descriptors work properly.
pytestmark = pytest.mark.usefixtures("qapp")


def test_export_image_empty_path():
    """export_image returns False for empty/None path."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    assert item.export_image("") is False
    assert item.export_image(None) is False


def test_export_image_zero_size_item_fails():
    """export_image returns False when the item has no geometry to render."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    assert item.export_image("/tmp/test_wafer.png") is False


def test_export_image_unwritable_path_fails(tmp_path):
    """export_image returns False when the target directory doesn't exist."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    item.setWidth(100)
    item.setHeight(100)
    item.values = [10.0, 20.0, 30.0]
    assert item.export_image(str(tmp_path / "no_such_dir" / "wafer.png")) is False


def test_thickness_properties():
    """Thickness data properties exist with correct defaults."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()

    assert item._thickness_data == []
    assert item._show_thickness is False


def test_thickness_setter_updates_data():
    """Setting thicknessData updates _thickness_data."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    item._rebuild_thickness = MagicMock()

    item.thicknessData = [1.0, 2.0, 3.0]

    assert item._thickness_data == [1.0, 2.0, 3.0]
    assert item._rebuild_thickness.called


def test_show_thickness_setter():
    """Setting showThickness updates _show_thickness."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    assert item._show_thickness is False

    item.showThickness = True
    assert item._show_thickness is True


def test_export_image_writes_real_png_headless(tmp_path):
    """export_image must produce an actual decodable image file without a
    QQuickWindow — the button was silently failing because grabToImage()
    resolves asynchronously and never completes headless/immediately."""
    from PySide6.QtGui import QImage

    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    item.setWidth(200)
    item.setHeight(200)
    item.values = [10.0, 20.0, 30.0]
    out = tmp_path / "wafer.png"

    assert item.export_image(str(out)) is True
    assert out.exists()
    loaded = QImage(str(out))
    assert not loaded.isNull()
    assert loaded.width() == 200


def test_export_image_includes_metrics_footer(tmp_path):
    """With sensor values loaded, the export gains a footer strip below the
    map carrying the metric readouts (sensors / min / max / avg)."""
    from PySide6.QtGui import QImage

    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    item.setWidth(200)
    item.setHeight(200)
    item.values = [10.0, 20.0, 30.0]
    out = tmp_path / "wafer.png"

    assert item.export_image(str(out)) is True
    loaded = QImage(str(out))
    assert loaded.height() > 200  # footer strip appended
    # footer is painted opaque (dark bg), not transparent
    assert loaded.pixelColor(5, loaded.height() - 5).alpha() == 255


def test_export_image_no_data_fails(tmp_path):
    """No file loaded / no stream played -> nothing meaningful to export."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    item.setWidth(200)
    item.setHeight(200)
    out = tmp_path / "wafer.png"

    assert item.export_image(str(out)) is False
    assert not out.exists()