import sys
import types
import unittest
from unittest.mock import patch

if "qgis" not in sys.modules:
    qgis_mod = types.ModuleType("qgis")
    qgis_utils = types.ModuleType("qgis.utils")
    qgis_utils.iface = types.SimpleNamespace()
    qgis_utils.plugins = {}
    qgis_mod.utils = qgis_utils
    sys.modules["qgis"] = qgis_mod
    sys.modules["qgis.utils"] = qgis_utils

from sn_verfahrensgebiet.ui.dockwidget import DockWidget


class _DummyTabWidget:
    def __init__(self):
        self.tabs = []

    def addTab(self, widget, title):
        self.tabs.append((widget, title))


class _TabWithServices:
    tab_title = "WithServices"

    def __init__(self, _parent):
        self.services = None

    def set_services(self, pruefmanager=None, data_grabber=None):
        self.services = (pruefmanager, data_grabber)


class _TabWithoutServices:
    tab_title = "WithoutServices"

    def __init__(self, _parent):
        pass


class _TabRaises:
    tab_title = "Broken"

    def __init__(self, _parent):
        raise RuntimeError("boom")


class TestDockWidget(unittest.TestCase):

    @patch("sn_verfahrensgebiet.ui.dockwidget.QTabWidget", _DummyTabWidget)
    def test_init_tabs_with_services_injects_available_services(self):
        obj = DockWidget.__new__(DockWidget)
        obj.tabs = [_TabWithServices, _TabWithoutServices]
        obj.pruefmanager = object()
        obj.data_grabber = object()
        obj._set_widget_calls = []
        obj.setWidget = lambda value: obj._set_widget_calls.append(value)

        DockWidget._init_tabs_with_services(obj)

        self.assertEqual(len(obj._set_widget_calls), 2)
        tab_widget = obj._set_widget_calls[-1]
        self.assertIsInstance(tab_widget, _DummyTabWidget)
        self.assertEqual(len(tab_widget.tabs), 2)

        first_tab = tab_widget.tabs[0][0]
        self.assertEqual(first_tab.services, (obj.pruefmanager, obj.data_grabber))

    @patch("sn_verfahrensgebiet.ui.dockwidget.error")
    @patch("sn_verfahrensgebiet.ui.dockwidget.QTabWidget", _DummyTabWidget)
    def test_init_tabs_with_services_reports_errors(self, mock_error):
        obj = DockWidget.__new__(DockWidget)
        obj.tabs = [_TabRaises]
        obj.pruefmanager = object()
        obj.data_grabber = object()
        obj.setWidget = lambda _value: None

        DockWidget._init_tabs_with_services(obj)

        mock_error.assert_called_once()


if __name__ == "__main__":
    unittest.main()