'''
Selection tests
===============

'''

import unittest

from kivy.uix.widget import Widget
from kivy.uix.listview import ListView, ListItemButton
from kivy.properties import NumericProperty, StringProperty
from kivy.adapters.listadapter import ListAdapter
from kivy.adapters.dictadapter import DictAdapter
from kivy.adapters.models import SelectableDataItem

# The following integers_dict and fruit categories / fruit data dictionaries
# are from kivy/examples/widgets/lists/fixtures.py, and the classes are from
# examples there.

# ----------------------------------------------------------------------------
# A dictionary of dicts, with only the minimum required is_selected attribute,
# for use with examples using a simple list of integers in a list view.
integers_dict = \
        {str(i): {'text': str(i), 'is_selected': False} for i in range(100)}


# ----------------------------------------------------------------------------
# A dataset of fruit category and fruit data for use in examples.
#
# Data from http://www.fda.gov/Food/LabelingNutrition/\
#                FoodLabelingGuidanceRegulatoryInformation/\
#                InformationforRestaurantsRetailEstablishments/\
#                ucm063482.htm
#
fruit_categories = \
        {'Melons': {'name': 'Melons',
                    'fruits': ['Cantaloupe', 'Honeydew', 'Watermelon'],
                    'is_selected': False},
         'Tree Fruits': {'name': 'Tree Fruits',
                         'fruits': ['Apple', 'Avocado', 'Banana', 'Nectarine',
                                    'Peach', 'Pear', 'Pineapple', 'Plum',
                                    'Cherry'],
                         'is_selected': False},
         'Citrus Fruits': {'name': 'Citrus Fruits',
                           'fruits': ['Grapefruit', 'Lemon', 'Lime', 'Orange',
                                      'Tangerine'],
                           'is_selected': False},
         'Other Fruits': {'name': 'Other Fruits',
                          'fruits': ['Grape', 'Kiwifruit',
                                     'Strawberry'],
                          'is_selected': False}}

fruit_data_list_of_dicts = \
    [{'name':'Apple',
      'Serving Size': '1 large (242 g/8 oz)',
      'data': [130, 0, 0, 0, 0, 0, 260, 7, 34, 11, 5, 20, 25, 1, 2, 8, 2, 2],
      'is_selected': False},
     {'name':'Avocado',
      'Serving Size': '1/5 medium (30 g/1.1 oz)',
      'data': [50, 35, 4.5, 7, 0, 0, 140, 4, 3, 1, 1, 4, 0, 1, 0, 4, 0, 2],
      'is_selected': False},
     {'name':'Banana',
      'Serving Size': '1 medium (126 g/4.5 oz)',
      'data': [110, 0, 0, 0, 0, 0, 450, 13, 30, 10, 3, 12, 19, 1, 2, 15, 0, 2],
      'is_selected': False},
     {'name':'Cantaloupe',
      'Serving Size': '1/4 medium (134 g/4.8 oz)',
      'data': [50, 0, 0, 0, 20, 1, 240, 7, 12, 4, 1, 4, 11, 1, 120, 80, 2, 2],
      'is_selected': False},
     {'name':'Grapefruit',
      'Serving Size': '1/2 medium (154 g/5.5 oz)',
      'data': [60, 0, 0, 0, 0, 0, 160, 5, 15, 5, 2, 8, 11, 1, 35, 100, 4, 0],
      'is_selected': False},
     {'name':'Grape',
      'Serving Size': '3/4 cup (126 g/4.5 oz)',
      'data': [90, 0, 0, 0, 15, 1, 240, 7, 23, 8, 1, 4, 20, 0, 0, 2, 2, 0],
      'is_selected': False},
     {'name':'Honeydew',
      'Serving Size': '1/10 medium melon (134 g/4.8 oz)',
      'data': [50, 0, 0, 0, 30, 1, 210, 6, 12, 4, 1, 4, 11, 1, 2, 45, 2, 2],
      'is_selected': False},
     {'name':'Kiwifruit',
      'Serving Size': '2 medium (148 g/5.3 oz)',
      'data': [90, 10, 1, 2, 0, 0, 450, 13, 20, 7, 4, 16, 13, 1, 2, 240, 4, 2],
      'is_selected': False},
     {'name':'Lemon',
      'Serving Size': '1 medium (58 g/2.1 oz)',
      'data': [15, 0, 0, 0, 0, 0, 75, 2, 5, 2, 2, 8, 2, 0, 0, 40, 2, 0],
      'is_selected': False},
     {'name':'Lime',
      'Serving Size': '1 medium (67 g/2.4 oz)',
      'data': [20, 0, 0, 0, 0, 0, 75, 2, 7, 2, 2, 8, 0, 0, 0, 35, 0, 0],
      'is_selected': False},
     {'name':'Nectarine',
      'Serving Size': '1 medium (140 g/5.0 oz)',
      'data': [60, 5, 0.5, 1, 0, 0, 250, 7, 15, 5, 2, 8, 11, 1, 8, 15, 0, 2],
      'is_selected': False},
     {'name':'Orange',
      'Serving Size': '1 medium (154 g/5.5 oz)',
      'data': [80, 0, 0, 0, 0, 0, 250, 7, 19, 6, 3, 12, 14, 1, 2, 130, 6, 0],
      'is_selected': False},
     {'name':'Peach',
      'Serving Size': '1 medium (147 g/5.3 oz)',
      'data': [60, 0, 0.5, 1, 0, 0, 230, 7, 15, 5, 2, 8, 13, 1, 6, 15, 0, 2],
      'is_selected': False},
     {'name':'Pear',
      'Serving Size': '1 medium (166 g/5.9 oz)',
      'data': [100, 0, 0, 0, 0, 0, 190, 5, 26, 9, 6, 24, 16, 1, 0, 10, 2, 0],
      'is_selected': False},
     {'name':'Pineapple',
      'Serving Size': '2 slices, 3" diameter, 3/4" thick (112 g/4 oz)',
      'data': [50, 0, 0, 0, 10, 0, 120, 3, 13, 4, 1, 4, 10, 1, 2, 50, 2, 2],
      'is_selected': False},
     {'name':'Plum',
      'Serving Size': '2 medium (151 g/5.4 oz)',
      'data': [70, 0, 0, 0, 0, 0, 230, 7, 19, 6, 2, 8, 16, 1, 8, 10, 0, 2],
      'is_selected': False},
     {'name':'Strawberry',
      'Serving Size': '8 medium (147 g/5.3 oz)',
      'data': [50, 0, 0, 0, 0, 0, 170, 5, 11, 4, 2, 8, 8, 1, 0, 160, 2, 2],
      'is_selected': False},
     {'name':'Cherry',
      'Serving Size': '21 cherries; 1 cup (140 g/5.0 oz)',
      'data': [100, 0, 0, 0, 0, 0, 350, 10, 26, 9, 1, 4, 16, 1, 2, 15, 2, 2],
      'is_selected': False},
     {'name':'Tangerine',
      'Serving Size': '1 medium (109 g/3.9 oz)',
      'data': [50, 0, 0, 0, 0, 0, 160, 5, 13, 4, 2, 8, 9, 1, 6, 45, 4, 0],
      'is_selected': False},
     {'name':'Watermelon',
      'Serving Size': '1/18 medium melon; 2 cups diced pieces (280 g/10.0 oz)',
      'data': [80, 0, 0, 0, 0, 0, 270, 8, 21, 7, 1, 4, 20, 1, 30, 25, 2, 4],
      'is_selected': False}]

fruit_data_attributes = ['(gram weight/ ounce weight)',
                         'Calories',
                         'Calories from Fat',
                         'Total Fat',
                         'Sodium',
                         'Potassium',
                         'Total Carbo-hydrate',
                         'Dietary Fiber',
                         'Sugars',
                         'Protein',
                         'Vitamin A',
                         'Vitamin C',
                         'Calcium',
                         'Iron']

fruit_data_attribute_units = ['(g)',
                              '(%DV)',
                              '(mg)',
                              '(%DV)',
                              '(mg)',
                              '(%DV)',
                              '(g)',
                              '(%DV)',
                              '(g)(%DV)',
                              '(g)',
                              '(g)',
                              '(%DV)',
                              '(%DV)',
                              '(%DV)',
                              '(%DV)']

attributes_and_units = \
        dict(list(zip(fruit_data_attributes, fruit_data_attribute_units)))

fruit_data = {}
for fruit_record in fruit_data_list_of_dicts:
    fruit_data[fruit_record['name']] = {}
    fruit_data[fruit_record['name']] = \
            dict({'name': fruit_record['name'],
                  'Serving Size': fruit_record['Serving Size'],
                  'is_selected': fruit_record['is_selected']},
            **dict(list(zip(list(attributes_and_units.keys()),
                            fruit_record['data']))))


class CategoryItem(SelectableDataItem):

    def __init__(self, is_selected=False, fruits=None, name='', **kwargs):
        super(CategoryItem, self).__init__(is_selected=is_selected, **kwargs)
        self.name = name
        self.fruits = fruits if fruits is not None else []
        self.is_selected = is_selected


class FruitItem(SelectableDataItem):

    def __init__(self, is_selected=False, data=None, name='', **kwargs):
        self.serving_size = kwargs.pop('Serving Size', '')
        super(FruitItem, self).__init__(is_selected=is_selected, **kwargs)
        self.name = name
        self.data = data if data is not None else data
        self.is_selected = is_selected


def reset_to_defaults(data):
    if type(data) is 'dict':
        for key in data:
            data[key]['is_selected'] = False
    elif type(data) is 'list':
        for obj in data:
            obj.is_selected = False

category_data_items = \
    [CategoryItem(**fruit_categories[c]) for c in sorted(fruit_categories)]

fruit_data_items = \
    [FruitItem(**fruit_dict) for fruit_dict in fruit_data_list_of_dicts]


class FruitSelectionObserver(Widget):
    fruit_name = StringProperty('')
    call_count = NumericProperty(0)

    def on_selection_change(self, list_adapter, *args):
        if len(list_adapter.selection) > 0:
            self.fruit_name = list_adapter.selection[0].text
        self.call_count += 1


class FruitsDictAdapter(DictAdapter):

    def fruit_category_changed(self, fruit_categories_adapter, *args):
        if len(fruit_categories_adapter.selection) == 0:
            self.data = {}
            return

        category = \
                fruit_categories[str(fruit_categories_adapter.selection[0])]
        self.sorted_keys = category['fruits']


class ListAdapterTestCase(unittest.TestCase):

    def setUp(self):
        self.args_converter = \
                lambda row_index, selectable: {'text': selectable.name,
                                               'size_hint_y': None,
                                               'height': 25}

        reset_to_defaults(category_data_items)
        reset_to_defaults(fruit_data_items)
        reset_to_defaults(fruit_categories)
        reset_to_defaults(fruit_data)

    def test_list_adapter_selection_mode_none(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='none',
                                   allow_empty_selection=True,
                                   cls=ListItemButton)

        self.assertEqual(sorted([obj.name for obj in list_adapter.data]),
            ['Apple', 'Avocado', 'Banana', 'Cantaloupe', 'Cherry', 'Grape',
             'Grapefruit', 'Honeydew', 'Kiwifruit', 'Lemon', 'Lime',
             'Nectarine', 'Orange', 'Peach', 'Pear', 'Pineapple', 'Plum',
             'Strawberry', 'Tangerine', 'Watermelon'])

        # The reason why len(selection) == 0 here is because it is ListView,
        # at the end of its __init__(), that calls check_for_empty_selection()
        # and triggers the initial selection, and we didn't make a ListView.
        self.assertEqual(len(list_adapter.selection), 0)
        list_adapter.check_for_empty_selection()
        self.assertEqual(len(list_adapter.selection), 0)

    def test_list_adapter_selection_mode_single(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='single',
                                   propagate_selection_to_data=True,
                                   allow_empty_selection=True,
                                   cls=ListItemButton)
        list_view = ListView(adapter=list_adapter)

        # The reason why len(selection) == 0 here is because ListView,
        # at the end of its __init__(), calls check_for_empty_selection()
        # and does NOT trigger the initial selection, because we set
        # allow_empty_selection = True.
        self.assertEqual(len(list_adapter.selection), 0)
        list_adapter.check_for_empty_selection()

        # Nothing should have changed by that call, because still we have
        # allow_empty_selection = True, so no action in that check.
        self.assertEqual(len(list_adapter.selection), 0)

        # Still no selection, but triggering a selection should make len = 1.
        # So, first we need to select the associated data item.
        self.assertEqual(fruit_data_items[0].name, 'Apple')
        fruit_data_items[0].is_selected = True
        apple = list_view.adapter.get_view(0)
        self.assertEqual(apple.text, 'Apple')
        self.assertTrue(apple.is_selected)
        self.assertEqual(len(list_adapter.selection), 1)

    def test_list_adapter_selection_mode_single_auto_selection(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='single',
                                   allow_empty_selection=False,
                                   cls=ListItemButton)
        list_view = ListView(adapter=list_adapter)

        # The reason why len(selection) == 1 here is because ListView,
        # at the end of its __init__(), calls check_for_empty_selection()
        # and triggers the initial selection, because allow_empty_selection is
        # False.
        apple = list_view.adapter.cached_views[0]
        self.assertEqual(list_adapter.selection[0], apple)
        self.assertEqual(len(list_adapter.selection), 1)
        list_adapter.check_for_empty_selection()

        # Nothing should have changed for len, as we already have a selection.
        self.assertEqual(len(list_adapter.selection), 1)

    def test_list_adapter_selection_mode_multiple_auto_selection(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='multiple',
                                   propagate_selection_to_data=True,
                                   allow_empty_selection=False,
                                   cls=ListItemButton)
        list_view = ListView(adapter=list_adapter)

        # The reason why len(selection) == 1 here is because ListView,
        # at the end of its __init__(), calls check_for_empty_selection()
        # and triggers the initial selection, because allow_empty_selection is
        # False.
        self.assertEqual(len(list_adapter.selection), 1)
        apple = list_adapter.selection[0]
        self.assertEqual(apple.text, 'Apple')

        # Add Avocado to the selection, doing necessary steps on data first.
        self.assertEqual(fruit_data_items[1].name, 'Avocado')
        fruit_data_items[1].is_selected = True
        avocado = list_view.adapter.get_view(1)  # does selection
        self.assertEqual(avocado.text, 'Avocado')
        self.assertEqual(len(list_adapter.selection), 2)

        # Re-selection of the same item should decrease the len by 1.
        list_adapter.handle_selection(avocado)
        self.assertEqual(len(list_adapter.selection), 1)
        # And now only apple should be in selection.
        self.assertEqual(list_adapter.selection, [apple])

        # Selection of several different items should increment len,
        # because we have selection_mode as multiple.
        #
        # avocado has been unselected. Select it again.
        list_adapter.handle_selection(avocado)
        self.assertEqual(len(list_adapter.selection), 2)
        self.assertEqual(list_adapter.selection, [apple, avocado])

        # And select some different ones.
        self.assertEqual(fruit_data_items[2].name, 'Banana')
        fruit_data_items[2].is_selected = True
        banana = list_view.adapter.get_view(2)  # does selection
        self.assertEqual(list_adapter.selection, [apple, avocado, banana])
        self.assertEqual(len(list_adapter.selection), 3)

    def test_list_adapter_selection_mode_multiple_and_limited(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='multiple',
                                   propagate_selection_to_data=True,
                                   selection_limit=3,
                                   allow_empty_selection=True,
                                   cls=ListItemButton)
        list_view = ListView(adapter=list_adapter)

        # Selection should be limited to 3 items, because selection_limit = 3.
        for i in range(5):
            # Add item to the selection, doing necessary steps on data first.
            fruit_data_items[i].is_selected = True
            list_view.adapter.get_view(i)  # does selection
            self.assertEqual(len(list_adapter.selection),
                             i + 1 if i < 3 else 3)

    def test_list_adapter_selection_handle_selection(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='single',
                                   propagate_selection_to_data=True,
                                   allow_empty_selection=False,
                                   cls=ListItemButton)

        selection_observer = FruitSelectionObserver()
        list_adapter.bind(
                on_selection_change=selection_observer.on_selection_change)

        list_view = ListView(adapter=list_adapter)

        self.assertEqual(selection_observer.call_count, 0)

        # From the check for initial selection, we should have apple selected.
        self.assertEqual(list_adapter.selection[0].text, 'Apple')
        self.assertEqual(len(list_adapter.selection), 1)

        # Go through the tests routine to trigger selection of banana.
        # (See notes above about triggering selection in tests.)
        self.assertEqual(fruit_data_items[2].name, 'Banana')
        fruit_data_items[2].is_selected = True
        banana = list_view.adapter.get_view(2)  # does selection
        self.assertTrue(banana.is_selected)

        # Now unselect it with handle_selection().
        list_adapter.handle_selection(banana)
        self.assertFalse(banana.is_selected)

        # But, since we have allow_empty_selection=False, Apple will be
        # reselected.
        self.assertEqual(selection_observer.fruit_name, 'Apple')

        # Call count:
        #
        # Apple got selected initally (0), then unselected when Banana was
        # selected (1). Then banana was unselected, causing reselection of
        # Apple (3). len should be 1.
        self.assertEqual(selection_observer.call_count, 3)
        self.assertEqual(len(list_adapter.selection), 1)


class DictAdapterTestCase(unittest.TestCase):

    def setUp(self):
        self.args_converter = lambda row_index, rec: {'text': rec['name'],
                                                      'size_hint_y': None,
                                                      'height': 25}

        self.fruits = sorted(fruit_data.keys())

        reset_to_defaults(fruit_categories)
        reset_to_defaults(fruit_data)

    def test_dict_adapter_selection_cascade(self):

        # Categories of fruits:
        #
        categories = sorted(fruit_categories.keys())
        categories_dict_adapter = \
            DictAdapter(sorted_keys=categories,
                        data=fruit_categories,
                        args_converter=self.args_converter,
                        selection_mode='single',
                        allow_empty_selection=False,
                        cls=ListItemButton)

        fruit_categories_list_view = \
            ListView(adapter=categories_dict_adapter,
                     size_hint=(.2, 1.0))

        # Fruits, for a given category, are shown based on the fruit category
        # selected in the first categories list above. The selected item in
        # the first list is used as the key into a dict of lists of list
        # items to reset the data in FruitsDictAdapter's
        # fruit_category_changed() method.
        #
        # data is initially set to the first list of list items.
        #
        fruits_dict_adapter = \
                FruitsDictAdapter(
                    sorted_keys=fruit_categories[categories[0]]['fruits'],
                    data=fruit_data,
                    args_converter=self.args_converter,
                    selection_mode='single',
                    allow_empty_selection=False,
                    cls=ListItemButton)

        categories_dict_adapter.bind(
            on_selection_change=fruits_dict_adapter.fruit_category_changed)

        fruits_list_view = ListView(adapter=fruits_dict_adapter,
                                    size_hint=(.2, 1.0))

        # List views should have adapters set.
        self.assertEqual(fruit_categories_list_view.adapter,
                categories_dict_adapter)
        self.assertEqual(fruits_list_view.adapter, fruits_dict_adapter)

        # Each list adapter has allow_empty_selection=False, so each should
        # have one selected item.
        self.assertEqual(len(categories_dict_adapter.selection), 1)
        self.assertEqual(len(fruits_dict_adapter.selection), 1)

        # The selected list items should show is_selected True.
        self.assertEqual(categories_dict_adapter.selection[0].is_selected,
                True)
        self.assertEqual(fruits_dict_adapter.selection[0].is_selected,
                True)

        # And they should be red, for background_color.
        self.assertEqual(
                categories_dict_adapter.selection[0].background_color,
                [1.0, 0., 0., 1.0])
        self.assertEqual(
                fruits_dict_adapter.selection[0].background_color,
                [1.0, 0., 0., 1.0])
