from typing import Dict
from unittest.mock import Mock

import pytest
from sqlalchemy.engine.reflection import Inspector

from datahub.ingestion.source.sql.sql_common import PipelineContext, SQLAlchemySource
from datahub.ingestion.source.sql.sql_config import SQLCommonConfig
from datahub.ingestion.source.sql.sqlalchemy_uri_mapper import (
    get_platform_from_sqlalchemy_uri,
)


class _TestSQLAlchemyConfig(SQLCommonConfig):
    def get_sql_alchemy_url(self):
        pass


class _TestSQLAlchemySource(SQLAlchemySource):
    pass


def test_generate_foreign_key():
    config: SQLCommonConfig = _TestSQLAlchemyConfig()
    ctx: PipelineContext = PipelineContext(run_id="test_ctx")
    platform: str = "TEST"
    inspector: Inspector = Mock()
    source = _TestSQLAlchemySource(config=config, ctx=ctx, platform=platform)
    fk_dict: Dict[str, str] = {
        "name": "test_constraint",
        "referred_table": "test_table",
        "referred_schema": "test_referred_schema",
        "constrained_columns": ["test_column"],  # type: ignore
        "referred_columns": ["test_referred_column"],  # type: ignore
    }
    foreign_key = source.get_foreign_key_metadata(
        dataset_urn="test_urn",
        schema="test_schema",
        fk_dict=fk_dict,
        inspector=inspector,
    )

    assert fk_dict.get("name") == foreign_key.name
    assert [
        "urn:li:schemaField:(urn:li:dataset:(urn:li:dataPlatform:TEST,test_referred_schema.test_table,PROD),test_referred_column)"
    ] == foreign_key.foreignFields
    assert ["urn:li:schemaField:(test_urn,test_column)"] == foreign_key.sourceFields


def test_use_source_schema_for_foreign_key_if_not_specified():
    config: SQLCommonConfig = _TestSQLAlchemyConfig()
    ctx: PipelineContext = PipelineContext(run_id="test_ctx")
    platform: str = "TEST"
    inspector: Inspector = Mock()
    source = _TestSQLAlchemySource(config=config, ctx=ctx, platform=platform)
    fk_dict: Dict[str, str] = {
        "name": "test_constraint",
        "referred_table": "test_table",
        "constrained_columns": ["test_column"],  # type: ignore
        "referred_columns": ["test_referred_column"],  # type: ignore
    }
    foreign_key = source.get_foreign_key_metadata(
        dataset_urn="test_urn",
        schema="test_schema",
        fk_dict=fk_dict,
        inspector=inspector,
    )

    assert fk_dict.get("name") == foreign_key.name
    assert [
        "urn:li:schemaField:(urn:li:dataset:(urn:li:dataPlatform:TEST,test_schema.test_table,PROD),test_referred_column)"
    ] == foreign_key.foreignFields
    assert ["urn:li:schemaField:(test_urn,test_column)"] == foreign_key.sourceFields


PLATFORM_FROM_SQLALCHEMY_URI_TEST_CASES: Dict[str, str] = {
    "awsathena://test_athena:3316/athenadb": "athena",
    "bigquery://test_bq:3316/bigquery": "bigquery",
    "clickhouse://test_clickhouse:3316/clickhousedb": "clickhouse",
    "druid://test_druid:1101/druiddb": "druid",
    "hive://test_hive:1201/hive": "hive",
    "mongodb://test_mongodb:1201/mongo": "mongodb",
    "mssql://test_mssql:1201/mssqldb": "mssql",
    "mysql://test_mysql:1201/mysql": "mysql",
    "oracle://test_oracle:3306/oracledb": "oracle",
    "pinot://test_pinot:3306/pinot": "pinot",
    "postgresql://test_postgres:5432/postgres": "postgres",
    "presto://test_presto:5432/prestodb": "presto",
    "redshift://test_redshift:5432/redshift": "redshift",
    "jdbc:postgres://test_redshift:5432/redshift.amazonaws": "redshift",
    "postgresql://test_redshift:5432/redshift.amazonaws": "redshift",
    "snowflake://test_snowflake:5432/snowflakedb": "snowflake",
    "trino://test_trino:5432/trino": "trino",
}


@pytest.mark.parametrize(
    "uri, expected_platform",
    PLATFORM_FROM_SQLALCHEMY_URI_TEST_CASES.items(),
    ids=PLATFORM_FROM_SQLALCHEMY_URI_TEST_CASES.keys(),
)
def test_get_platform_from_sqlalchemy_uri(uri: str, expected_platform: str) -> None:
    platform: str = get_platform_from_sqlalchemy_uri(uri)
    assert platform == expected_platform