import json
import unittest
from collections import defaultdict
from unittest import mock
from unittest.mock import patch

import numpy as np
import pandas as pd

from dataprofiler.profilers import OrderColumn
from dataprofiler.profilers.json_encoder import ProfileEncoder

from .. import test_utils

# This is taken from: https://github.com/rlworkgroup/dowel/pull/36/files
# undo when cpython#4800 is merged.
unittest.case._AssertWarnsContext.__enter__ = test_utils.patched_assert_warns


class TestOrderColumn(unittest.TestCase):
    @staticmethod
    def _update_order(data):
        df = pd.Series(data).apply(str)

        profiler = OrderColumn(df.name)
        profiler.update(df)

        return profiler.order

    def test_base_case(self):
        data = pd.Series([], dtype=object)
        profiler = OrderColumn(data.name)
        profiler.update(data)

        self.assertEqual(profiler.sample_size, 0)
        self.assertIsNone(profiler.order)

    def test_descending(self):
        data = ["za", "z", "c", "a"]
        order = self._update_order(data)
        self.assertEqual(order, "descending")

        data = [5, 3, 2]
        order = self._update_order(data)
        self.assertEqual(order, "descending")

    def test_ascending(self):
        data = ["a", "b", "z", "za"]
        order = self._update_order(data)
        self.assertEqual(order, "ascending")

        data = [2, 3, 11]
        order = self._update_order(data)
        self.assertEqual(order, "ascending")

    def test_constant_value(self):
        data = ["a"]
        order = self._update_order(data)
        self.assertEqual(order, "constant value")

        data = ["a", "a", "a", "a", "a"]
        order = self._update_order(data)
        self.assertEqual(order, "constant value")

    def test_random(self):
        data = ["a", "b", "ab"]
        order = self._update_order(data)
        self.assertEqual(order, "random")

        data = [1, 11, 4]
        order = self._update_order(data)
        self.assertEqual(order, "random")

    def test_batch_updates(self):
        data = ["a", "a", "a"]
        df = pd.Series(data)
        profiler = OrderColumn(df.name)
        profiler.update(df)
        self.assertEqual(profiler.order, "constant value")

        data = ["a", "b", "c"]
        df = pd.Series(data)
        profiler.update(df)
        self.assertEqual(profiler.order, "ascending")

        # previous was ascending, should stay ascending bc now receiving const
        data = ["c", "c", "c"]
        df = pd.Series(data)
        profiler.update(df)
        self.assertEqual(profiler.order, "ascending")

        # previous was ascending, should be random now receiving descending
        data = ["c", "b", "a"]
        df = pd.Series(data)
        profiler.update(df)
        self.assertEqual(profiler.order, "random")

    def test_profile(self):
        data = [1]
        df = pd.Series(data).apply(str)

        profiler = OrderColumn(df.name)

        expected_profile = dict(order="constant value", times={"order": 2.0})
        time_array = [float(x) for x in range(4, 0, -1)]
        with mock.patch("time.time", side_effect=lambda: time_array.pop()):
            profiler.update(df)
            profile = profiler.profile

            # key and value populated correctly
            self.assertDictEqual(expected_profile, profile)

    def test_report(self):
        data = [1]
        df = pd.Series(data).apply(str)

        profile = OrderColumn(df.name)

        report1 = profile.profile
        report2 = profile.report(remove_disabled_flag=False)
        report3 = profile.report(remove_disabled_flag=True)
        self.assertDictEqual(report1, report2)
        self.assertDictEqual(report1, report3)

    def test_profile_merge(self):
        data = [1, 2, 3, 4, 5, 6]
        df = pd.Series(data).apply(str)
        profiler = OrderColumn("placeholder_name")
        profiler.update(df)

        data2 = [7, 8, 9, 10]
        df2 = pd.Series(data2).apply(str)
        profiler2 = OrderColumn("placeholder_name")
        profiler2.update(df2)

        data3 = [2, 3, 4]
        df3 = pd.Series(data3).apply(str)
        profiler3 = OrderColumn("placeholder_name")
        profiler3.update(df3)

        data4 = [3, 3, 3, 3]
        df4 = pd.Series(data4).apply(str)
        profiler4 = OrderColumn("placeholder_name")
        profiler4.update(df4)

        data5 = [4, 2, 3, 1, 5]
        df5 = pd.Series(data5).apply(str)
        profiler5 = OrderColumn("placeholder_name")
        profiler5.update(df5)

        data6 = [10, 9, 8, 7]
        df6 = pd.Series(data6).apply(str)
        profiler6 = OrderColumn("placeholder_name")
        profiler6.update(df6)

        data7 = [3, 3, 3]
        df7 = pd.Series(data7).apply(str)
        profiler7 = OrderColumn("placeholder_name")
        profiler7.update(df7)

        data8 = [7, 7, 7, 7, 7, 7, 7]
        df8 = pd.Series(data8).apply(str)
        profiler8 = OrderColumn("placeholder_name")
        profiler8.update(df8)

        data9 = [7, 6, 5, 4, 3]
        df9 = pd.Series(data9).apply(str)
        profiler9 = OrderColumn("placeholder_name")
        profiler9.update(df9)

        data10 = [1, 5, 6]
        df10 = pd.Series(data10).apply(str)
        profiler10 = OrderColumn("placeholder_name")
        profiler10.update(df10)
        profiler10._piecewise = True

        data11 = pd.Series([], dtype=object)
        df11 = pd.Series(data11).apply(str)
        profiler11 = OrderColumn("placeholder_name")
        profiler11.update(df11)

        # Ascending + Ascending, non-intersecting, non-piecewise
        profiler_merged = profiler + profiler2
        self.assertEqual(profiler_merged.order, "ascending")
        self.assertEqual(profiler_merged._last_value, 10)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Ascending, intersecting, non-piecewise
        profiler_merged = profiler + profiler3
        self.assertEqual(profiler_merged.order, "random")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Ascending, intersecting, both piecewise
        profiler_merged = profiler + profiler2
        profiler_merged2 = profiler + profiler2
        profiler_merged = profiler_merged + profiler_merged2
        self.assertEqual(profiler_merged.order, "ascending")
        self.assertEqual(profiler_merged._last_value, 10)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Ascending, intersecting, Enveloping piecewise
        profiler_merged = profiler3 + profiler10
        self.assertEqual(profiler_merged.order, "ascending")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Ascending, non-intersecting, both piecewise
        profiler_test1 = profiler
        profiler_test1._piecewise = True
        profiler_test2 = profiler2
        profiler_test2._piecewise = True
        profiler_merged = profiler_test1 + profiler2
        self.assertEqual(profiler_merged.order, "ascending")
        self.assertEqual(profiler_merged._last_value, 10)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Ascending, intersecting (on top of each other), Not piecewise
        profiler._piecewise = False
        profiler_merged = profiler + profiler
        self.assertEqual(profiler_merged.order, "random")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Constant, intersecting, Not piecewise
        profiler_merged = profiler + profiler4
        self.assertEqual(profiler_merged.order, "random")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Constant, intersecting, Ascending is piecewise
        profiler._piecewise = True
        profiler_merged = profiler + profiler4
        self.assertEqual(profiler_merged.order, "ascending")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Random
        profiler._piecewise = False
        profiler_merged = profiler + profiler5
        self.assertEqual(profiler_merged.order, "random")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 1)

        # Ascending + Descending
        profiler._piecewise = False
        profiler_merged = profiler + profiler6
        self.assertEqual(profiler_merged.order, "random")
        self.assertEqual(profiler_merged._last_value, 10)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 1)

        # Constant + Constant (same constant value)
        profiler_merged = profiler4 + profiler7
        self.assertEqual(profiler_merged.order, "constant value")
        self.assertEqual(profiler_merged._last_value, 3)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 3)

        # Constant + Constant (different constant value)
        profiler_merged = profiler4 + profiler8
        self.assertEqual(profiler_merged.order, "constant value")
        self.assertEqual(profiler_merged._last_value, 7)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 3)

        # Descending + Descending, non intersecting (except on edge), non piecewise
        profiler_merged = profiler6 + profiler9
        self.assertEqual(profiler_merged.order, "descending")
        self.assertEqual(profiler_merged._last_value, 3)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 10)

        # Descending + Constant, non intersecting (except on edge), non piecewise
        profiler_merged = profiler8 + profiler9
        self.assertEqual(profiler_merged.order, "descending")
        self.assertEqual(profiler_merged._last_value, 3)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 7)

        # Descending + Constant, non intersecting (except on edge), non piecewise
        profiler_merged = profiler6 + profiler8 + profiler9
        self.assertEqual(profiler_merged.order, "descending")
        self.assertEqual(profiler_merged._last_value, 3)
        self.assertEqual(profiler_merged._piecewise, True)
        self.assertEqual(profiler_merged._first_value, 10)

        # Ascending + Empty = Ascending
        profiler_merged = profiler + profiler11
        self.assertEqual(profiler_merged.order, "ascending")
        self.assertEqual(profiler_merged._last_value, 6)
        self.assertEqual(profiler_merged._piecewise, False)
        self.assertEqual(profiler_merged._first_value, 1)

    def test_merge_timing(self):
        profiler1 = OrderColumn("placeholder_name")
        profiler2 = OrderColumn("placeholder_name")

        profiler1.times = dict(order=2.0)
        profiler2.times = dict(order=3.0)

        time_array = [float(i) for i in range(2, 0, -1)]
        with mock.patch("time.time", side_effect=lambda: time_array.pop()):
            profiler3 = profiler1 + profiler2

            # __add__() call adds 1 so expected is 6
            expected_times = defaultdict(float, {"order": 6.0})
            self.assertDictEqual(expected_times, profiler3.profile["times"])

    @mock.patch("dataprofiler.profilers.OrderColumn._get_data_order")
    def test_random_order_prevents_update_from_occuring(self, mock_get_data_order):
        mock_get_data_order.return_value = ["random", 1, 2]
        data = ["a", "b", "ab"]
        df = pd.Series(data).apply(str)

        # Assert the order is random
        profiler = OrderColumn(df.name)
        profiler.update(df)
        self.assertEqual(profiler.order, "random")

        # Assert that the update wasn't called again
        profiler.update(data)
        mock_get_data_order.assert_called_once()

    def test_order_column_with_wrong_options(self):
        with self.assertRaisesRegex(
            ValueError,
            "OrderColumn parameter 'options' must be of" " type OrderOptions.",
        ):
            profiler = OrderColumn("Order", options="wrong_data_type")

    def test_diff(self):
        data = [1, 2, 3, 4, 5, 6]
        df = pd.Series(data).apply(str)
        profiler = OrderColumn("placeholder_name")
        profiler.update(df)

        data2 = [7, 8, 9, 10]
        df2 = pd.Series(data2).apply(str)
        profiler2 = OrderColumn("placeholder_name")
        profiler2.update(df2)

        diff = profiler.diff(profiler2)
        self.assertEqual("unchanged", diff["order"])

        data3 = [4, 2, 3, 1, 5]
        df3 = pd.Series(data3).apply(str)
        profiler3 = OrderColumn("placeholder_name")
        profiler3.update(df3)

        diff = profiler.diff(profiler3)
        self.assertEqual(["ascending", "random"], diff["order"])

    def test_json_encode(self):
        profile = OrderColumn("0")

        serialized = json.dumps(profile, cls=ProfileEncoder)
        expected = json.dumps(
            {
                "order": None,
                "_last_value": None,
                "_first_value": None,
                "_piecewise": False,
                "_OrderColumn__calculations": dict(),
                "name": "0",
                "col_index": np.nan,
                "sample_size": 0,
                "metadata": dict(),
                "times": defaultdict(),
                "thread_safe": True,
            }
        )

        self.assertEqual(serialized, expected)

    def test_json_encode_after_update(self):
        profile = OrderColumn("0")

        df_order = pd.Series(["za", "z", "c", "a"])
        with patch("time.time", side_effect=lambda: 0.0):
            profile.update(df_order)

        serialized = json.dumps(profile, cls=ProfileEncoder)
        expected = json.dumps(
            {
                "order": "descending",
                "_last_value": "a",
                "_first_value": "za",
                "_piecewise": False,
                "_OrderColumn__calculations": dict(),
                "name": "0",
                "col_index": np.nan,
                "sample_size": 4,
                "metadata": dict(),
                "times": {"order": 0.0},
                "thread_safe": True,
            }
        )

        self.assertEqual(serialized, expected)
