import unittest
from unittest.mock import patch

from sn_basis.functions.qgiscore_wrapper import (
    MAP_GRID_ANNOTATION_DISPLAY_HIDE_ALL,
    MAP_GRID_ANNOTATION_DISPLAY_SHOW_X,
    MAP_GRID_ANNOTATION_DISPLAY_SHOW_Y,
    MAP_GRID_BORDER_BOTTOM,
    MAP_GRID_BORDER_LEFT,
    MAP_GRID_BORDER_RIGHT,
    MAP_GRID_BORDER_TOP,
    MAP_GRID_FRAME_STYLE_INTERIOR_TICKS,
    MAP_GRID_STYLE_FRAME_ANNOTATIONS,
    TEXT_BACKGROUND_SHAPE_RECTANGLE,
    TEXT_BACKGROUND_SIZE_BUFFER,
    TEXT_RENDER_UNIT_MILLIMETERS,
    TEXT_RENDER_UNIT_POINTS,
    QgsLayoutItemLegend,
    QgsLayoutItemMap,
    QgsPrintLayout,
    QgsProject,
)
from sn_basis.modules.print_layout import PrintLayout


class _FakeExtent:
    def isNull(self) -> bool:
        return False


class _FakeLegendForResize:
    def __init__(self) -> None:
        self.last_resize = None

    def setLocked(self, _enabled: bool) -> None:
        pass

    def setColumnCount(self, _count: int) -> None:
        pass

    def setEqualColumnWidth(self, _enabled: bool) -> None:
        pass

    def refresh(self) -> None:
        pass

    def adjustBoxSize(self) -> None:
        pass

    def attemptResize(self, size) -> None:
        self.last_resize = size


class TestPrintLayout(unittest.TestCase):

    def test_create_legend_item_links_map_and_enables_map_filtering(self):
        project = QgsProject.instance()
        print_layout = PrintLayout(project=project)
        layout = QgsPrintLayout(project)
        linked_map = QgsLayoutItemMap(layout)

        legend = print_layout._create_legend_item(
            layout,
            "legende",
            linked_map,
            10.0,
            20.0,
            width_mm=50.0,
            height_mm=30.0,
        )

        self.assertIs(legend.linked_map, linked_map)
        self.assertTrue(legend.auto_update_model)
        self.assertTrue(legend.legend_filter_by_map_enabled)

    def test_create_legend_item_does_not_copy_project_layers_into_legend_model(self):
        project = QgsProject.instance()
        print_layout = PrintLayout(project=project)
        layout = QgsPrintLayout(project)
        linked_map = QgsLayoutItemMap(layout)

        legend = print_layout._create_legend_item(
            layout,
            "legende",
            linked_map,
            10.0,
            20.0,
        )

        root_group = legend.model().rootGroup()
        self.assertEqual(root_group.layers, [])

    def test_configure_legend_size_uses_content_adaptive_size(self):
        project = QgsProject.instance()
        print_layout = PrintLayout(project=project)
        legend = _FakeLegendForResize()

        with patch.object(print_layout, "_get_item_size_mm", return_value=(95.0, 33.0)):
            height = print_layout._configure_legend_size(
                legend,
                width_limit_mm=180.0,
                column_count=2,
                equal_column_width=True,
            )

        self.assertIsNone(legend.last_resize)
        self.assertEqual(height, 33.0)

    def test_configure_hauptkarte_grids_uses_wrapper_constants(self):
        project = QgsProject.instance()
        print_layout = PrintLayout(project=project)
        layout = QgsPrintLayout(project)
        hauptkarte = QgsLayoutItemMap(layout)

        print_layout._configure_hauptkarte_grids(hauptkarte)

        grid_stack = hauptkarte.grids()
        grids = grid_stack.asList()
        self.assertEqual(len(grids), 1)

        frame_grid = grids[0]

        self.assertEqual(frame_grid.style, MAP_GRID_STYLE_FRAME_ANNOTATIONS)
        self.assertEqual(frame_grid.frame_style, MAP_GRID_FRAME_STYLE_INTERIOR_TICKS)
        self.assertTrue(frame_grid.annotation_enabled)
        self.assertEqual(frame_grid.annotation_display[MAP_GRID_BORDER_LEFT], MAP_GRID_ANNOTATION_DISPLAY_HIDE_ALL)
        self.assertEqual(frame_grid.annotation_display[MAP_GRID_BORDER_TOP], MAP_GRID_ANNOTATION_DISPLAY_HIDE_ALL)
        self.assertEqual(frame_grid.annotation_display[MAP_GRID_BORDER_RIGHT], MAP_GRID_ANNOTATION_DISPLAY_SHOW_Y)
        self.assertEqual(frame_grid.annotation_display[MAP_GRID_BORDER_BOTTOM], MAP_GRID_ANNOTATION_DISPLAY_SHOW_X)

        text_format = frame_grid.annotation_text_format
        self.assertIsNotNone(text_format)
        self.assertEqual(getattr(text_format, "size", None), 10)
        self.assertEqual(getattr(text_format, "size_unit", None), TEXT_RENDER_UNIT_POINTS)

        background = getattr(text_format, "background", None)
        self.assertIsNotNone(background)
        self.assertTrue(getattr(background, "enabled", False))
        self.assertEqual(getattr(background, "shape_type", None), TEXT_BACKGROUND_SHAPE_RECTANGLE)
        self.assertEqual(getattr(background, "size_type", None), TEXT_BACKGROUND_SIZE_BUFFER)
        self.assertEqual(getattr(background, "size_unit", None), TEXT_RENDER_UNIT_MILLIMETERS)
        self.assertEqual(getattr(background, "offset_unit", None), TEXT_RENDER_UNIT_MILLIMETERS)
        offset = getattr(background, "offset", None)
        self.assertIsNotNone(offset)
        if isinstance(offset, tuple):
            self.assertEqual(offset[1], -1.0)
        else:
            y_value = getattr(offset, "y", None)
            if callable(y_value):
                self.assertEqual(y_value(), -1.0)
            else:
                self.assertEqual(getattr(offset, "y", None), -1.0)

    @patch("sn_basis.modules.print_layout.open_layout_designer")
    def test_create_single_page_layout_keeps_legend_linked_to_hauptkarte_and_theme(self, _mock_open_designer):
        project = QgsProject.instance()
        print_layout = PrintLayout(project=project)

        layout = print_layout.create_single_page_layout(
            name="Testlayout",
            page_width_mm=420.0,
            page_height_mm=297.0,
            map_width_mm=200.0,
            map_height_mm=150.0,
            extent=_FakeExtent(),
            plotmassstab=5000.0,
            thema="Thema A",
        )

        hauptkarte = next(item for item in layout.items if isinstance(item, QgsLayoutItemMap))
        legende = next(item for item in layout.items if isinstance(item, QgsLayoutItemLegend))

        self.assertTrue(hauptkarte.follow_visibility_preset)
        self.assertEqual(hauptkarte.follow_visibility_preset_name, "Thema A")
        self.assertTrue(hauptkarte.keep_layer_set)
        self.assertIs(legende.linked_map, hauptkarte)
        self.assertTrue(legende.auto_update_model)
        self.assertTrue(legende.legend_filter_by_map_enabled)


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