"""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_valid_path():
    """export_image saves a PNG when grabToImage succeeds."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()

    mock_image = MagicMock()
    mock_result = MagicMock()
    mock_result.image.return_value = mock_image
    item.grabToImage = MagicMock(return_value=mock_result)

    assert item.export_image("/tmp/test_wafer.png") is True


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_grab_fails():
    """export_image returns False when grabToImage raises."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    item = WaferMapItem()
    item.grabToImage = MagicMock(side_effect=RuntimeError("grab failed"))

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


def test_export_image_save_fails():
    """export_image returns False when image.save raises."""
    from pygui.backend.visualization.wafer_map_item import WaferMapItem

    mock_image = MagicMock()
    mock_image.save.side_effect = IOError("disk full")
    mock_result = MagicMock()
    mock_result.image.return_value = mock_image

    item = WaferMapItem()
    item.grabToImage = MagicMock(return_value=mock_result)

    assert item.export_image("/tmp/test_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