#  Copyright 2021 Collate
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#  http://www.apache.org/licenses/LICENSE-2.0
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

"""
Tests utils function for the profiler
"""

from datetime import datetime
from unittest import TestCase

import pytest
from sqlalchemy import Column, create_engine
from sqlalchemy.orm import declarative_base, sessionmaker
from sqlalchemy.sql.sqltypes import Integer, String

from metadata.profiler.metrics.hybrid.histogram import Histogram
from metadata.profiler.metrics.system.queries.snowflake import (
    get_snowflake_system_queries,
)
from metadata.profiler.metrics.system.system import recursive_dic
from metadata.utils.profiler_utils import (
    get_identifiers_from_string,
    get_value_from_cache,
    set_cache,
)
from metadata.utils.sqa_utils import handle_array, is_array

from .conftest import Row

Base = declarative_base()


class Users(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True)
    name = Column(String(30))
    fullname = Column(String)


class TestHistogramUtils(TestCase):
    @classmethod
    def setUpClass(cls):
        cls.histogram = Histogram()

    def test_histogram_label_formatter_positive(self):
        """test label formatter for histogram"""
        formatted_label = self.histogram._format_bin_labels(18927, 23456)
        assert formatted_label == "18.93K to 23.46K"

        formatted_label = self.histogram._format_bin_labels(18927)
        assert formatted_label == "18.93K and up"

    def test_histogram_label_formatter_negative(self):
        """test label formatter for histogram for negative numbers"""
        formatted_label = self.histogram._format_bin_labels(-18927, -23456)
        assert formatted_label == "-18.93K to -23.46K"

        formatted_label = self.histogram._format_bin_labels(-18927)
        assert formatted_label == "-18.93K and up"

    def test_histogram_label_formatter_none(self):
        """test label formatter for histogram for None"""
        formatted_label = self.histogram._format_bin_labels(None)
        assert formatted_label == "null and up"

    def test_histogram_label_formatter_zero(self):
        """test label formatter for histogram with zero"""
        formatted_label = self.histogram._format_bin_labels(0)
        assert formatted_label == "0 and up"

    def test_histogram_label_formatter_nines(self):
        """test label formatter for histogram for nines"""
        formatted_label = self.histogram._format_bin_labels(99999999)
        assert formatted_label == "100.00M and up"

    def test_histogram_label_formatter_floats(self):
        """test label formatter for histogram for floats"""
        formatted_label = self.histogram._format_bin_labels(167893.98542, 194993.98542)
        assert formatted_label == "167.89K to 194.99K"


def test_is_array():
    """test is array function"""
    kwargs = {}
    assert is_array(kwargs) is False
    assert not kwargs

    kwargs = {"is_array": True, "array_col": "name"}
    assert kwargs["is_array"] is True
    assert is_array(kwargs) is True
    assert kwargs["array_col"] == "name"
    assert len(kwargs) == 1

    kwargs = {"is_array": False, "array_col": "name"}
    assert kwargs["is_array"] is False
    assert is_array(kwargs) is False
    assert not kwargs


def test_get_snowflake_system_queries():
    """Test get snowflake system queries"""
    row = Row(
        query_id="1",
        query_type="INSERT",
        start_time=datetime.now(),
        query_text="INSERT INTO DATABASE.SCHEMA.TABLE1 (col1, col2) VALUES (1, 'a'), (2, 'b')",
    )

    query_result = get_snowflake_system_queries(row, "DATABASE", "SCHEMA")  # type: ignore
    assert query_result
    assert query_result.query_id == "1"
    assert query_result.query_type == "INSERT"
    assert query_result.database_name == "database"
    assert query_result.schema_name == "schema"
    assert query_result.table_name == "table1"

    row = Row(
        query_id=1,
        query_type="INSERT",
        start_time=datetime.now(),
        query_text="INSERT INTO SCHEMA.TABLE1 (col1, col2) VALUES (1, 'a'), (2, 'b')",
    )

    query_result = get_snowflake_system_queries(row, "DATABASE", "SCHEMA")  # type: ignore

    assert not query_result


@pytest.mark.parametrize(
    "query, expected",
    [
        (
            "INSERT INTO DATABASE.SCHEMA.TABLE1 (col1, col2) VALUES (1, 'a'), (2, 'b')",
            "INSERT",
        ),
        (
            "INSERT OVERWRITE INTO DATABASE.SCHEMA.TABLE1 (col1, col2) VALUES (1, 'a'), (2, 'b')",
            "INSERT",
        ),
        (
            "MERGE INTO DATABASE.SCHEMA.TABLE1 (col1, col2) VALUES (1, 'a'), (2, 'b')",
            "MERGE",
        ),
        ("DELETE FROM DATABASE.SCHEMA.TABLE1 WHERE val = 9999", "MERGE"),
        ("UPDATE DATABASE.SCHEMA.TABLE1 SET col1 = 1 WHERE val = 9999", "UPDATE"),
    ],
)
def test_get_snowflake_system_queries_all_dll(query, expected):
    """test we ca get all ddl queries
    reference https://docs.snowflake.com/en/sql-reference/sql-dml
    """
    row = Row(
        query_id=1,
        query_type=expected,
        start_time=datetime.now(),
        query_text=query,
    )

    query_result = get_snowflake_system_queries(row, "DATABASE", "SCHEMA")  # type: ignore

    assert query_result
    assert query_result.query_type == expected
    assert query_result.database_name == "database"
    assert query_result.schema_name == "schema"
    assert query_result.table_name == "table1"


@pytest.mark.parametrize(
    "identifier, expected",
    [
        ("DATABASE.SCHEMA.TABLE1", ("DATABASE", "SCHEMA", "TABLE1")),
        ('DATABASE.SCHEMA."TABLE.DOT"', ("DATABASE", "SCHEMA", "TABLE.DOT")),
        ('DATABASE."SCHEMA.DOT".TABLE', ("DATABASE", "SCHEMA.DOT", "TABLE")),
        ('"DATABASE.DOT".SCHEMA.TABLE', ("DATABASE.DOT", "SCHEMA", "TABLE")),
        ('DATABASE."SCHEMA.DOT"."TABLE.DOT"', ("DATABASE", "SCHEMA.DOT", "TABLE.DOT")),
        ('"DATABASE.DOT"."SCHEMA.DOT".TABLE', ("DATABASE.DOT", "SCHEMA.DOT", "TABLE")),
        (
            '"DATABASE.DOT"."SCHEMA.DOT"."TABLE.DOT"',
            ("DATABASE.DOT", "SCHEMA.DOT", "TABLE.DOT"),
        ),
    ],
)
def test_get_identifiers_from_string(identifier, expected):
    """test get identifiers from string"""
    assert get_identifiers_from_string(identifier) == expected


def test_cache_func():
    """test get and set cache"""
    cache_dict = recursive_dic()
    cache_value = [1, 2, 3, 4, 5]
    new_cache_value = [6, 7, 8, 9, 10]

    cache = get_value_from_cache(cache_dict, "key1.key2.key3")
    assert not cache

    set_cache(cache_dict, "key1.key2.key3", cache_value)
    cache = get_value_from_cache(cache_dict, "key1.key2.key3")
    assert cache == cache_value

    # calling set_cache on the same key will reset the cache
    set_cache(cache_dict, "key1.key2.key3", new_cache_value)
    cache = get_value_from_cache(cache_dict, "key1.key2.key3")
    assert cache == new_cache_value