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import unittest

from sqlalchemy.dialects import mysql
from sqlalchemy.dialects.mysql import DATE, NVARCHAR, TEXT, VARCHAR

from superset.db_engine_specs.mysql import MySQLEngineSpec
from superset.utils.core import GenericDataType
from tests.db_engine_specs.base_tests import TestDbEngineSpec


class TestMySQLEngineSpecsDbEngineSpec(TestDbEngineSpec):
    @unittest.skipUnless(
        TestDbEngineSpec.is_module_installed("MySQLdb"), "mysqlclient not installed"
    )
    def test_get_datatype_mysql(self):
        """Tests related to datatype mapping for MySQL"""
        self.assertEqual("TINY", MySQLEngineSpec.get_datatype(1))
        self.assertEqual("VARCHAR", MySQLEngineSpec.get_datatype(15))

    def test_convert_dttm(self):
        dttm = self.get_dttm()

        self.assertEqual(
            MySQLEngineSpec.convert_dttm("DATE", dttm),
            "STR_TO_DATE('2019-01-02', '%Y-%m-%d')",
        )

        self.assertEqual(
            MySQLEngineSpec.convert_dttm("DATETIME", dttm),
            "STR_TO_DATE('2019-01-02 03:04:05.678900', '%Y-%m-%d %H:%i:%s.%f')",
        )

    def test_column_datatype_to_string(self):
        test_cases = (
            (DATE(), "DATE"),
            (VARCHAR(length=255), "VARCHAR(255)"),
            (
                VARCHAR(length=255, charset="latin1", collation="utf8mb4_general_ci"),
                "VARCHAR(255)",
            ),
            (NVARCHAR(length=128), "NATIONAL VARCHAR(128)"),
            (TEXT(), "TEXT"),
        )

        for original, expected in test_cases:
            actual = MySQLEngineSpec.column_datatype_to_string(
                original, mysql.dialect()
            )
            self.assertEqual(actual, expected)

    def test_is_db_column_type_match(self):
        type_expectations = (
            # Numeric
            ("TINYINT", GenericDataType.NUMERIC),
            ("SMALLINT", GenericDataType.NUMERIC),
            ("MEDIUMINT", GenericDataType.NUMERIC),
            ("INT", GenericDataType.NUMERIC),
            ("BIGINT", GenericDataType.NUMERIC),
            ("DECIMAL", GenericDataType.NUMERIC),
            ("FLOAT", GenericDataType.NUMERIC),
            ("DOUBLE", GenericDataType.NUMERIC),
            ("BIT", GenericDataType.NUMERIC),
            # String
            ("CHAR", GenericDataType.STRING),
            ("VARCHAR", GenericDataType.STRING),
            ("TINYTEXT", GenericDataType.STRING),
            ("MEDIUMTEXT", GenericDataType.STRING),
            ("LONGTEXT", GenericDataType.STRING),
            # Temporal
            ("DATE", GenericDataType.TEMPORAL),
            ("DATETIME", GenericDataType.TEMPORAL),
            ("TIMESTAMP", GenericDataType.TEMPORAL),
            ("TIME", GenericDataType.TEMPORAL),
        )

        for type_str, col_type in type_expectations:
            column_spec = MySQLEngineSpec.get_column_spec(type_str)
            assert column_spec.generic_type == col_type

    def test_extract_error_message(self):
        from MySQLdb._exceptions import OperationalError

        message = "Unknown table 'BIRTH_NAMES1' in information_schema"
        exception = OperationalError(message)
        extracted_message = MySQLEngineSpec._extract_error_message(exception)
        assert extracted_message == message

        exception = OperationalError(123, message)
        extracted_message = MySQLEngineSpec._extract_error_message(exception)
        assert extracted_message == message