#  Copyright 2025 Collate
#  Licensed under the Collate Community License, Version 1.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#  https://github.com/open-metadata/OpenMetadata/blob/main/ingestion/LICENSE
#  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.

"""
Validate query parser logic
"""

from unittest import TestCase

from collate_sqllineage.core.models import Column

from metadata.generated.schema.type.tableUsageCount import TableColumn, TableColumnJoin
from metadata.ingestion.lineage.models import Dialect
from metadata.ingestion.lineage.parser import LineageParser


class QueryParserTests(TestCase):
    """
    Check methods from query_parser.py
    """

    col_lineage = """
        SELECT
          a.col1,
          a.col2 + b.col2 AS col2,
          case 
            when col1 = 3 then 'hello'
            else 'bye'
          end as new_col
        FROM foo a
        JOIN db.grault b
          ON a.col1 = b.col1
        JOIN db.holis c
          ON a.col1 = c.abc
        JOIN db.random d
          ON a.col2 = d.col2
        WHERE a.col3 = 'abc'
    """

    parser = LineageParser(col_lineage)
    parser_with_dialect = LineageParser(col_lineage, dialect=Dialect.TSQL)

    def test_involved_tables(self):
        expected_tables = {"db.grault", "db.holis", "<default>.foo", "db.random"}
        tables = {str(table) for table in self.parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        tables = {str(table) for table in self.parser_with_dialect.involved_tables}
        self.assertEqual(tables, expected_tables)

    def test_clean_parser_table_list(self):
        expected_tables = {"db.grault", "db.holis", "foo", "db.random"}
        clean_tables = set(self.parser.clean_table_list)
        self.assertEqual(clean_tables, expected_tables)
        clean_tables = set(self.parser_with_dialect.clean_table_list)
        self.assertEqual(clean_tables, expected_tables)

    def test_bracketed_parser_table_list(self):
        expected_tables = {"test_schema.test_view", "test_table"}
        parser = LineageParser(
            "create view [test_schema].[test_view] as select * from [test_table];"
        )
        clean_tables = set(parser.clean_table_list)
        self.assertEqual(clean_tables, expected_tables)
        parser = LineageParser(
            "create view [test_schema].[test_view] as select * from [test_table];",
            dialect=Dialect.TSQL,
        )
        clean_tables = set(parser.clean_table_list)
        self.assertEqual(clean_tables, expected_tables)

    def test_parser_table_aliases(self):
        expected_tables = {
            "b": "db.grault",
            "c": "db.holis",
            "a": "foo",
            "d": "db.random",
        }
        aliases = self.parser.table_aliases
        self.assertEqual(aliases, expected_tables)
        aliases = self.parser_with_dialect.table_aliases
        self.assertEqual(aliases, expected_tables)

    def test_get_table_joins(self):
        """
        main logic point
        """
        expected_joins = [
            TableColumnJoin(
                tableColumn=TableColumn(table="foo", column="col1"),
                joinedWith=[
                    TableColumn(table="db.grault", column="col1"),
                    TableColumn(table="db.holis", column="abc"),
                ],
            ),
            TableColumnJoin(
                tableColumn=TableColumn(table="foo", column="col2"),
                joinedWith=[
                    TableColumn(table="db.random", column="col2"),
                ],
            ),
        ]

        joins = self.parser.table_joins

        self.assertEqual(
            joins["foo"],
            expected_joins,
        )

        joins = self.parser_with_dialect.table_joins

        self.assertEqual(
            joins["foo"],
            expected_joins,
        )

    def test_capitals(self):
        """
        Example on how LineageRunner keeps capitals
        for column names
        """

        query = """
         SELECT
           USERS.ID,
           li.id
        FROM TESTDB.PUBLIC.USERS
        JOIN testdb.PUBLIC."lowercase_users" li
          ON USERS.id = li.ID
        ;
        """

        expected_joins = [
            TableColumnJoin(
                tableColumn=TableColumn(
                    table="testdb.public.users", column="id"
                ),  # lowercase col
                joinedWith=[
                    TableColumn(
                        table="testdb.public.lowercase_users", column="ID"
                    ),  # uppercase col
                ],
            ),
        ]

        parser = LineageParser(query)

        joins = parser.table_joins

        self.assertEqual(
            joins["testdb.public.users"],
            expected_joins,
        )

        parser = LineageParser(query, dialect=Dialect.MYSQL)

        joins = parser.table_joins

        self.assertEqual(
            joins["testdb.public.users"],
            expected_joins,
        )

    def test_clean_raw_query_copy_grants(self):
        """
        Validate COPY GRANT query cleaning logic
        """
        query = "create or replace view my_view copy grants as select * from my_table"
        self.assertEqual(
            LineageParser.clean_raw_query(query),
            "create or replace view my_view as select * from my_table",
        )

    def test_clean_raw_query_merge_into(self):
        """
        Validate MERGE INTO query cleaning logic
        """
        query = """
            /* comment */ merge into table_1 using (select a, b from table_2) when matched update set t.a = 'value' 
            when not matched then insert (table_1.a, table_2.b) values ('value1', 'value2')
        """
        self.assertEqual(
            LineageParser.clean_raw_query(query),
            "/* comment */ merge into table_1 using (select a, b from table_2)",
        )

    def test_clean_raw_query_copy_from(self):
        """
        Validate COPY FROM query cleaning logic
        """
        query = "COPY my_schema.my_table FROM 's3://bucket/path/object.csv';"
        self.assertEqual(
            LineageParser.clean_raw_query(query),
            None,
        )

    def test_ctes_column_lineage(self):
        """
        Validate we obtain information from Comon Table Expressions
        """
        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
        ;
        """

        expected_lineage = [
            (
                Column("testdb.public.users.id"),
                Column("testdb.public.target.id"),
            ),
            (
                Column("testdb.public.users.name"),
                Column("testdb.public.target.name"),
            ),
        ]

        parser = LineageParser(query)
        tables = {str(table) for table in parser.source_tables}
        self.assertEqual(tables, {"testdb.public.users"})
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

        parser = LineageParser(query, dialect=Dialect.MYSQL)
        tables = {str(table) for table in parser.source_tables}
        self.assertEqual(tables, {"testdb.public.users"})
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

    def test_table_with_single_comment(self):
        """
        Validate we obtain information from Comon Table Expressions
        """
        query = """CREATE TABLE TESTDB.PUBLIC.TARGET AS
        SELECT
            ID,
            -- A comment here
            NAME
        FROM TESTDB.PUBLIC.USERS
        ;
        """
        expected_tables = {"testdb.public.users", "testdb.public.target"}
        expected_lineage = [
            (Column("testdb.public.users.id"), Column("testdb.public.target.id")),
            (
                Column("testdb.public.users.name"),
                Column("testdb.public.target.name"),
            ),
        ]

        parser = LineageParser(query)
        tables = {str(table) for table in parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

        parser = LineageParser(query, Dialect.MYSQL)
        tables = {str(table) for table in parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

    def test_table_with_aliases(self):
        """
        Validate we obtain information from Comon Table Expressions
        """
        query = """CREATE TABLE TESTDB.PUBLIC.TARGET AS
        SELECT
            ID AS new_identifier,
            NAME new_name
        FROM TESTDB.PUBLIC.USERS
        ;
        """
        expected_lineage = [
            (
                Column("testdb.public.users.id"),
                Column("testdb.public.target.new_identifier"),
            ),
            (
                Column("testdb.public.users.name"),
                Column("testdb.public.target.new_name"),
            ),
        ]
        expected_tables = {"testdb.public.users", "testdb.public.target"}

        parser = LineageParser(query)
        tables = {str(table) for table in parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

        parser = LineageParser(query, Dialect.MYSQL)
        tables = {str(table) for table in parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

    def test_copy_query(self):
        """
        Validate Copy query is skipped appropriately without any errors
        """
        query = """COPY MY_TABLE col1,col2,col3
        FROM 's3://bucket/schema/table.csv'
        WITH CREDENTIALS ''
        REGION 'US-east-2'
        """
        expected_lineage = []
        expected_tables = set()

        parser = LineageParser(query)
        tables = {str(table) for table in parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )

        parser = LineageParser(query, Dialect.MYSQL)
        tables = {str(table) for table in parser.involved_tables}
        self.assertEqual(tables, expected_tables)
        self.assertEqual(
            parser.column_lineage,
            expected_lineage,
        )