#  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.

"""
sql lineage utils tests
"""
import uuid
from unittest import TestCase

import pytest

from metadata.generated.schema.entity.data.table import Table
from metadata.ingestion.lineage.models import Dialect
from metadata.ingestion.lineage.parser import LineageParser
from metadata.ingestion.lineage.sql_lineage import (
    get_column_lineage,
    get_table_fqn_from_query_name,
    populate_column_lineage_map,
)
from metadata.utils.logger import Loggers

QUERY = [
    "CREATE TABLE MYTABLE2 AS SELECT * FROM MYTABLE1;",
    "CREATE TABLE MYTABLE3 AS SELECT ID, NAME FROM MYTABLE1",
    "CREATE VIEW MYVIEW2 AS SELECT NAME, CITY FROM MYTABLE1;",
    "INSERT INTO MYTABLE5 SELECT ID, NAME, CITY FROM MYTABLE1;",
]
EXPECTED_LINEAGE_MAP = [
    {"<default>.mytable2": {"<default>.mytable1": [("*", "*")]}},
    {"<default>.mytable3": {"<default>.mytable1": [("ID", "ID"), ("NAME", "NAME")]}},
    {"<default>.myview2": {"<default>.mytable1": [("CITY", "CITY"), ("NAME", "NAME")]}},
    {
        "<default>.mytable5": {
            "<default>.mytable1": [("CITY", "CITY"), ("ID", "ID"), ("NAME", "NAME")]
        }
    },
]


class SqlLineageTest(TestCase):
    """
    SQL Lineage Utility Tests
    """

    def test_populate_column_lineage_map(self):
        for i, query in enumerate(QUERY):
            lineage_parser = LineageParser(query)
            raw_column_lineage = lineage_parser.column_lineage
            lineage_map = populate_column_lineage_map(raw_column_lineage)
            self.assertEqual(lineage_map, EXPECTED_LINEAGE_MAP[i])

    def test_get_column_lineage_select_all(self):
        """
        Method to test column wildcard
        """
        # Given
        column_lineage_map = {
            "testdb.public.target": {"testdb.public.users": [("*", "*")]}
        }
        to_entity = Table(
            id=uuid.uuid4(),
            name="target",
            fullyQualifiedName="testdb.public.target",
            columns=[
                {
                    "name": "id",
                    "dataType": "NUMBER",
                    "fullyQualifiedName": "testdb.public.target.id",
                },
                {
                    "name": "otherCol",
                    "dataType": "NUMBER",
                    "fullyQualifiedName": "testdb.public.target.otherCol",
                },
            ],
        )
        from_entity = Table(
            id=uuid.uuid4(),
            name="users",
            fullyQualifiedName="testdb.public.users",
            columns=[
                {
                    "name": "id",
                    "dataType": "NUMBER",
                    "fullyQualifiedName": "testdb.public.users.id",
                }
            ],
        )
        # When
        col_lineage = get_column_lineage(
            to_entity=to_entity,
            to_table_raw_name="testdb.public.target",
            from_entity=from_entity,
            from_table_raw_name="testdb.public.users",
            column_lineage_map=column_lineage_map,
        )
        # Then
        assert len(col_lineage) == 1

    def test_populate_column_lineage_map_select_all(self):
        """
        Method to test column lineage map populate func
        """
        # Given
        query = """CREATE TABLE TESTDB.PUBLIC.TARGET AS
        SELECT * FROM TESTDB.PUBLIC.USERS
        ;
        """
        lineage_parser = LineageParser(query)
        raw_column_lineage = lineage_parser.column_lineage
        # When
        lineage_map = populate_column_lineage_map(raw_column_lineage)
        # Then
        self.assertEqual(
            lineage_map, {"testdb.public.target": {"testdb.public.users": [("*", "*")]}}
        )

    def test_populate_column_lineage_map_ctes(self):
        """
        Method to test column lineage map populate func with ctes
        """
        # Given
        query = """CREATE TABLE TESTDB.PUBLIC.TARGET AS
         WITH cte_table AS (
           SELECT
             USERS.ID,
             USERS.NAME
           FROM TESTDB.PUBLIC.USERS
        ),
        cte_table2 AS (
           SELECT
              ID,
              NAME
           FROM cte_table
        )        
        SELECT 
          ID,
          NAME
        FROM cte_table2
        ;
        """
        lineage_parser = LineageParser(query)
        raw_column_lineage = lineage_parser.column_lineage
        # When
        lineage_map = populate_column_lineage_map(raw_column_lineage)
        # Then
        self.assertEqual(
            lineage_map,
            {
                "testdb.public.target": {
                    "testdb.public.users": [("ID", "ID"), ("NAME", "NAME")]
                }
            },
        )

    @pytest.mark.skip(reason="It is flaky and must be reviewed.")
    def test_time_out_is_reached(self):
        """
        Method to test timeout
        """
        # Given
        query = """
        create table my_example_table as
        select *
        from (
            values
            {values}
        ) as my_data_example (value1, value2, value3, value4, value5)
        qualify row_number() over (partition by value1, value2 order by my_data_example is not null desc) = 1
        """
        values_format = "\t('value1{a}','value2{b}','value{c}','value{d}','value{e}')"
        values = [values_format.format(a=0, b=0, c=0, d=0, e=0)]
        for num in range(1, 2000):
            values.insert(
                0, values_format.format(a=num, b=num, c=num, d=num, e=num) + ","
            )
        # When
        with self.assertLogs(Loggers.INGESTION.value, level="DEBUG") as logger:
            LineageParser(
                query.format(values="\n".join(values)),
                dialect=Dialect.SNOWFLAKE,
                timeout_seconds=1,
            )
            # Then
            self.assertTrue(
                any(
                    "Parser has been running for more than 1 seconds." in log
                    for log in logger.output
                ),
                "Parser finished before the 1 expected seconds!",
            )

    def test_table_name_from_query(self):
        """
        Method to test get_table_fqn_from_query_name func
        """
        raw_query_name = "test.tab"

        self.assertEqual(
            get_table_fqn_from_query_name(raw_query_name), (None, "test", "tab")
        )

        raw_query_name = "db.test.tab"

        self.assertEqual(
            get_table_fqn_from_query_name(raw_query_name), ("db", "test", "tab")
        )

        raw_query_name = "tab"

        self.assertEqual(
            get_table_fqn_from_query_name(raw_query_name), (None, None, "tab")
        )

        raw_query_name = "project.dataset.info_schema.tab"

        self.assertEqual(
            get_table_fqn_from_query_name(raw_query_name), (None, None, "tab")
        )