# (C) Copyright 2004-2021 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!

""" Tests for TabularModel (an implementation of QAbstractTableModel)
"""

import unittest

from traits.api import HasTraits, List, Str
from traitsui.api import Item, TabularEditor, View
from traitsui.tabular_adapter import TabularAdapter

from traitsui.tests._tools import (
    BaseTestMixin,
    create_ui,
    is_qt,
    requires_toolkit,
    reraise_exceptions,
    ToolkitName,
)
try:
    from pyface.qt import QtCore
except ImportError:
    # The entire test case should be skipped if the current backend is not Qt
    # But if it is Qt, then re-raise
    if is_qt():
        raise


class DummyHasTraits(HasTraits):
    names = List(Str)


def get_view(adapter):
    return View(
        Item(
            "names",
            editor=TabularEditor(
                adapter=adapter,
            ),
        )
    )


@requires_toolkit([ToolkitName.qt])
class TestTabularModel(BaseTestMixin, unittest.TestCase):

    def setUp(self):
        BaseTestMixin.setUp(self)

    def tearDown(self):
        BaseTestMixin.tearDown(self)

    def test_drop_mime_data_below_list(self):
        # Test dragging an item in the list and drop it below the last item
        obj = DummyHasTraits(names=["A", "B", "C", "D"])
        view = get_view(TabularAdapter(columns=["Name"]))
        with reraise_exceptions(), \
                create_ui(obj, dict(view=view)) as ui:
            editor, = ui.get_editors("names")

            model = editor.model
            # sanity check
            self.assertEqual(model.rowCount(None), 4)

            # drag and drop row=1 from within the table.
            # drag creates a PyMimeData object for dropMimeData to consume.
            index = model.createIndex(1, 0)
            mime_data = model.mimeData([index])

            # when
            # dropped below the list, the "parent" is invalid.
            parent = QtCore.QModelIndex()   # invalid index object
            model.dropMimeData(mime_data, QtCore.Qt.MoveAction, -1, -1, parent)

            # then
            mime_data = model.mimeData(
                [model.createIndex(i, 0) for i in range(model.rowCount(None),)]
            )
            content = mime_data.instance()
            self.assertEqual(content, ["A", "C", "D", "B"])
            self.assertEqual(obj.names, content)

    def test_drop_mime_data_within_list(self):
        # Test dragging an item in the list and drop it somewhere within the
        # list
        obj = DummyHasTraits(names=["A", "B", "C", "D"])
        view = get_view(TabularAdapter(columns=["Name"]))

        with reraise_exceptions(), \
                create_ui(obj, dict(view=view)) as ui:
            editor, = ui.get_editors("names")

            model = editor.model
            # sanity check
            self.assertEqual(model.rowCount(None), 4)

            # drag and drop from within the table.
            # drag row index 0
            index = model.createIndex(0, 0)
            mime_data = model.mimeData([index])

            # when
            # drop it to row index 2
            parent = model.createIndex(2, 0)
            model.dropMimeData(mime_data, QtCore.Qt.MoveAction, -1, -1, parent)

            # then
            mime_data = model.mimeData(
                [model.createIndex(i, 0) for i in range(model.rowCount(None),)]
            )
            content = mime_data.instance()
            self.assertEqual(content, ["B", "C", "A", "D"])
            self.assertEqual(obj.names, content)

    def test_copy_item(self):
        # Test copy 'A' to the row after 'C'
        obj = DummyHasTraits(names=["A", "B", "C"])
        view = get_view(TabularAdapter(columns=["Name"], can_drop=True))

        with reraise_exceptions(), \
                create_ui(obj, dict(view=view)) as ui:
            editor, = ui.get_editors("names")

            model = editor.model
            # sanity check
            self.assertEqual(model.rowCount(None), 3)

            # drag and drop from within the table for copy action.
            # drag index 0
            index = model.createIndex(0, 0)
            mime_data = model.mimeData([index])

            # when
            # drop to index 2
            parent = model.createIndex(2, 0)
            model.dropMimeData(mime_data, QtCore.Qt.CopyAction, -1, -1, parent)

            # then
            self.assertEqual(model.rowCount(None), 4)
            mime_data = model.mimeData(
                [model.createIndex(i, 0) for i in range(model.rowCount(None),)]
            )
            content = mime_data.instance()
            self.assertEqual(content, ["A", "B", "C", "A"])
            self.assertEqual(obj.names, content)

    def test_move_rows_invalid_index(self):
        # Test the last resort to prevent segfault

        obj = DummyHasTraits(names=["A", "B", "C"])
        view = get_view(TabularAdapter(columns=["Name"]))

        with reraise_exceptions(), \
                create_ui(obj, dict(view=view)) as ui:
            editor, = ui.get_editors("names")

            model = editor.model
            # sanity check
            self.assertEqual(model.rowCount(None), 3)

            # when
            # -1 is an invalid row. This should not cause segfault.
            model.moveRows([1], -1)

            # then
            mime_data = model.mimeData(
                [model.createIndex(i, 0) for i in range(model.rowCount(None),)]
            )
            content = mime_data.instance()
            self.assertEqual(content, ["A", "C", "B"])
            self.assertEqual(obj.names, content)