# SPDX-License-Identifier: Apache-2.0
#
# The OpenSearch Contributors require contributions made to
# this file be licensed under the Apache-2.0 license or a
# compatible open source license.
#
# Modifications Copyright OpenSearch Contributors. See
# GitHub history for details.
#
#  Licensed to Elasticsearch B.V. under one or more contributor
#  license agreements. See the NOTICE file distributed with
#  this work for additional information regarding copyright
#  ownership. Elasticsearch B.V. licenses this file to you under
#  the Apache License, Version 2.0 (the "License"); you may
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#
# 	http://www.apache.org/licenses/LICENSE-2.0
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import sys
import uuid
from datetime import datetime
from decimal import Decimal
from typing import Any

try:
    import numpy as np
    import pandas as pd
except ImportError:
    np = pd = None

from opensearchpy.exceptions import ImproperlyConfigured, SerializationError
from opensearchpy.serializer import (
    DEFAULT_SERIALIZERS,
    Deserializer,
    JSONSerializer,
    TextSerializer,
)

from .test_cases import SkipTest, TestCase


def requires_numpy_and_pandas() -> None:
    if np is None or pd is None:
        raise SkipTest("Test requires numpy or pandas to be available")


class TestJSONSerializer(TestCase):
    def test_datetime_serialization(self) -> None:
        self.assertEqual(
            '{"d":"2010-10-01T02:30:00"}',
            JSONSerializer().dumps({"d": datetime(2010, 10, 1, 2, 30)}),
        )

    def test_decimal_serialization(self) -> None:
        requires_numpy_and_pandas()

        if sys.version_info[:2] == (2, 6):
            raise SkipTest("Float rounding is broken in 2.6.")
        self.assertEqual('{"d":3.8}', JSONSerializer().dumps({"d": Decimal("3.8")}))

    def test_uuid_serialization(self) -> None:
        self.assertEqual(
            '{"d":"00000000-0000-0000-0000-000000000003"}',
            JSONSerializer().dumps(
                {"d": uuid.UUID("00000000-0000-0000-0000-000000000003")}
            ),
        )

    def test_serializes_numpy_bool(self) -> None:
        requires_numpy_and_pandas()

        self.assertEqual('{"d":true}', JSONSerializer().dumps({"d": np.bool_(True)}))

    def test_serializes_numpy_integers(self) -> None:
        requires_numpy_and_pandas()

        ser = JSONSerializer()
        for np_type in (
            np.int_,
            np.int8,
            np.int16,
            np.int32,
            np.int64,
        ):
            self.assertEqual(ser.dumps({"d": np_type(-1)}), '{"d":-1}')

        for np_type in (
            np.uint8,
            np.uint16,
            np.uint32,
            np.uint64,
        ):
            self.assertEqual(ser.dumps({"d": np_type(1)}), '{"d":1}')

    def test_serializes_numpy_floats(self) -> None:
        requires_numpy_and_pandas()

        ser = JSONSerializer()
        for np_type in (
            np.float32,
            np.float64,
        ):
            self.assertRegex(ser.dumps({"d": np_type(1.2)}), r'^\{"d":1\.2[\d]*}$')

    def test_serializes_numpy_datetime(self) -> None:
        requires_numpy_and_pandas()

        self.assertEqual(
            '{"d":"2010-10-01T02:30:00"}',
            JSONSerializer().dumps({"d": np.datetime64("2010-10-01T02:30:00")}),
        )

    def test_serializes_numpy_ndarray(self) -> None:
        requires_numpy_and_pandas()

        self.assertEqual(
            '{"d":[0,0,0,0,0]}',
            JSONSerializer().dumps({"d": np.zeros((5,), dtype=np.uint8)}),
        )
        # This isn't useful for OpenSearch, just want to make sure it works.
        self.assertEqual(
            '{"d":[[0,0],[0,0]]}',
            JSONSerializer().dumps({"d": np.zeros((2, 2), dtype=np.uint8)}),
        )

    def test_serializes_numpy_nan_to_nan(self) -> None:
        requires_numpy_and_pandas()

        self.assertEqual(
            '{"d":NaN}',
            JSONSerializer().dumps({"d": np.nan}),
        )

    def test_serializes_pandas_timestamp(self) -> None:
        requires_numpy_and_pandas()

        self.assertEqual(
            '{"d":"2010-10-01T02:30:00"}',
            JSONSerializer().dumps({"d": pd.Timestamp("2010-10-01T02:30:00")}),
        )

    def test_serializes_pandas_series(self) -> None:
        requires_numpy_and_pandas()

        self.assertEqual(
            '{"d":["a","b","c","d"]}',
            JSONSerializer().dumps({"d": pd.Series(["a", "b", "c", "d"])}),
        )

    def test_serializes_pandas_na(self) -> None:
        requires_numpy_and_pandas()

        if not hasattr(pd, "NA"):  # pandas.NA added in v1
            raise SkipTest("pandas.NA required")
        self.assertEqual(
            '{"d":null}',
            JSONSerializer().dumps({"d": pd.NA}),
        )

    def test_raises_serialization_error_pandas_nat(self) -> None:
        requires_numpy_and_pandas()

        if not hasattr(pd, "NaT"):
            raise SkipTest("pandas.NaT required")
        self.assertRaises(SerializationError, JSONSerializer().dumps, {"d": pd.NaT})

    def test_serializes_pandas_category(self) -> None:
        requires_numpy_and_pandas()

        cat = pd.Categorical(["a", "c", "b", "a"], categories=["a", "b", "c"])
        self.assertEqual(
            '{"d":["a","c","b","a"]}',
            JSONSerializer().dumps({"d": cat}),
        )

        cat = pd.Categorical([1, 2, 3], categories=[1, 2, 3])
        self.assertEqual(
            '{"d":[1,2,3]}',
            JSONSerializer().dumps({"d": cat}),
        )

    def test_raises_serialization_error_on_dump_error(self) -> None:
        self.assertRaises(SerializationError, JSONSerializer().dumps, object())

    def test_raises_serialization_error_on_load_error(self) -> None:
        self.assertRaises(SerializationError, JSONSerializer().loads, object())
        self.assertRaises(SerializationError, JSONSerializer().loads, "")
        self.assertRaises(SerializationError, JSONSerializer().loads, "{{")

    def test_strings_are_left_untouched(self) -> None:
        self.assertEqual("你好", JSONSerializer().dumps("你好"))


class TestTextSerializer(TestCase):
    def test_strings_are_left_untouched(self) -> None:
        self.assertEqual("你好", TextSerializer().dumps("你好"))

    def test_raises_serialization_error_on_dump_error(self) -> None:
        self.assertRaises(SerializationError, TextSerializer().dumps, {})


class TestDeserializer(TestCase):
    def setup_method(self, _: Any) -> None:
        self.de = Deserializer(DEFAULT_SERIALIZERS)

    def test_deserializes_json_by_default(self) -> None:
        self.assertEqual({"some": "data"}, self.de.loads('{"some":"data"}'))

    def test_deserializes_text_with_correct_ct(self) -> None:
        self.assertEqual(
            '{"some":"data"}', self.de.loads('{"some":"data"}', "text/plain")
        )
        self.assertEqual(
            '{"some":"data"}',
            self.de.loads('{"some":"data"}', "text/plain; charset=whatever"),
        )

    def test_raises_serialization_error_on_unknown_mimetype(self) -> None:
        self.assertRaises(SerializationError, self.de.loads, "{}", "text/html")

    def test_raises_improperly_configured_when_default_mimetype_cannot_be_deserialized(
        self,
    ) -> None:
        self.assertRaises(ImproperlyConfigured, Deserializer, {})
