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from textwrap import dedent
from unittest import mock

from sqlalchemy import column, literal_column
from sqlalchemy.dialects import postgresql

from superset.db_engine_specs import get_engine_specs
from superset.db_engine_specs.postgres import PostgresEngineSpec
from superset.errors import ErrorLevel, SupersetError, SupersetErrorType
from superset.utils.core import GenericDataType
from tests.db_engine_specs.base_tests import assert_generic_types, TestDbEngineSpec
from tests.fixtures.certificates import ssl_certificate
from tests.fixtures.database import default_db_extra


class TestPostgresDbEngineSpec(TestDbEngineSpec):
    def test_get_table_names(self):
        """
        DB Eng Specs (postgres): Test get table names
        """

        """ Make sure postgres doesn't try to remove schema name from table name
        ie. when try_remove_schema_from_table_name == False. """
        inspector = mock.Mock()
        inspector.get_table_names = mock.Mock(return_value=["schema.table", "table_2"])
        inspector.get_foreign_table_names = mock.Mock(return_value=["table_3"])

        pg_result_expected = ["schema.table", "table_2", "table_3"]
        pg_result = PostgresEngineSpec.get_table_names(
            database=mock.ANY, schema="schema", inspector=inspector
        )
        self.assertListEqual(pg_result_expected, pg_result)

    def test_time_exp_literal_no_grain(self):
        """
        DB Eng Specs (postgres): Test no grain literal column
        """
        col = literal_column("COALESCE(a, b)")
        expr = PostgresEngineSpec.get_timestamp_expr(col, None, None)
        result = str(expr.compile(None, dialect=postgresql.dialect()))
        self.assertEqual(result, "COALESCE(a, b)")

    def test_time_exp_literal_1y_grain(self):
        """
        DB Eng Specs (postgres): Test grain literal column 1 YEAR
        """
        col = literal_column("COALESCE(a, b)")
        expr = PostgresEngineSpec.get_timestamp_expr(col, None, "P1Y")
        result = str(expr.compile(None, dialect=postgresql.dialect()))
        self.assertEqual(result, "DATE_TRUNC('year', COALESCE(a, b))")

    def test_time_ex_lowr_col_no_grain(self):
        """
        DB Eng Specs (postgres): Test no grain expr lower case
        """
        col = column("lower_case")
        expr = PostgresEngineSpec.get_timestamp_expr(col, None, None)
        result = str(expr.compile(None, dialect=postgresql.dialect()))
        self.assertEqual(result, "lower_case")

    def test_time_exp_lowr_col_sec_1y(self):
        """
        DB Eng Specs (postgres): Test grain expr lower case 1 YEAR
        """
        col = column("lower_case")
        expr = PostgresEngineSpec.get_timestamp_expr(col, "epoch_s", "P1Y")
        result = str(expr.compile(None, dialect=postgresql.dialect()))
        self.assertEqual(
            result,
            "DATE_TRUNC('year', "
            "(timestamp 'epoch' + lower_case * interval '1 second'))",
        )

    def test_time_exp_mixd_case_col_1y(self):
        """
        DB Eng Specs (postgres): Test grain expr mixed case 1 YEAR
        """
        col = column("MixedCase")
        expr = PostgresEngineSpec.get_timestamp_expr(col, None, "P1Y")
        result = str(expr.compile(None, dialect=postgresql.dialect()))
        self.assertEqual(result, "DATE_TRUNC('year', \"MixedCase\")")

    def test_convert_dttm(self):
        """
        DB Eng Specs (postgres): Test conversion to date time
        """
        dttm = self.get_dttm()

        self.assertEqual(
            PostgresEngineSpec.convert_dttm("DATE", dttm),
            "TO_DATE('2019-01-02', 'YYYY-MM-DD')",
        )

        self.assertEqual(
            PostgresEngineSpec.convert_dttm("TIMESTAMP", dttm),
            "TO_TIMESTAMP('2019-01-02 03:04:05.678900', 'YYYY-MM-DD HH24:MI:SS.US')",
        )

        self.assertEqual(
            PostgresEngineSpec.convert_dttm("DATETIME", dttm),
            "TO_TIMESTAMP('2019-01-02 03:04:05.678900', 'YYYY-MM-DD HH24:MI:SS.US')",
        )

        self.assertEqual(PostgresEngineSpec.convert_dttm("TIME", dttm), None)

    def test_empty_dbapi_cursor_description(self):
        """
        DB Eng Specs (postgres): Test empty cursor description (no columns)
        """
        cursor = mock.Mock()
        # empty description mean no columns, this mocks the following SQL: "SELECT"
        cursor.description = []
        results = PostgresEngineSpec.fetch_data(cursor, 1000)
        self.assertEqual(results, [])

    def test_engine_alias_name(self):
        """
        DB Eng Specs (postgres): Test "postgres" in engine spec
        """
        self.assertIn("postgres", get_engine_specs())

    def test_extras_without_ssl(self):
        db = mock.Mock()
        db.extra = default_db_extra
        db.server_cert = None
        extras = PostgresEngineSpec.get_extra_params(db)
        assert "connect_args" not in extras["engine_params"]

    def test_extras_with_ssl_default(self):
        db = mock.Mock()
        db.extra = default_db_extra
        db.server_cert = ssl_certificate
        extras = PostgresEngineSpec.get_extra_params(db)
        connect_args = extras["engine_params"]["connect_args"]
        assert connect_args["sslmode"] == "verify-full"
        assert "sslrootcert" in connect_args

    def test_extras_with_ssl_custom(self):
        db = mock.Mock()
        db.extra = default_db_extra.replace(
            '"engine_params": {}',
            '"engine_params": {"connect_args": {"sslmode": "verify-ca"}}',
        )
        db.server_cert = ssl_certificate
        extras = PostgresEngineSpec.get_extra_params(db)
        connect_args = extras["engine_params"]["connect_args"]
        assert connect_args["sslmode"] == "verify-ca"
        assert "sslrootcert" in connect_args

    def test_estimate_statement_cost_select_star(self):
        """
        DB Eng Specs (postgres): Test estimate_statement_cost select star
        """

        cursor = mock.Mock()
        cursor.fetchone.return_value = (
            "Seq Scan on birth_names  (cost=0.00..1537.91 rows=75691 width=46)",
        )
        sql = "SELECT * FROM birth_names"
        results = PostgresEngineSpec.estimate_statement_cost(sql, cursor)
        self.assertEqual(
            results, {"Start-up cost": 0.00, "Total cost": 1537.91,},
        )

    def test_estimate_statement_invalid_syntax(self):
        """
        DB Eng Specs (postgres): Test estimate_statement_cost invalid syntax
        """
        from psycopg2 import errors

        cursor = mock.Mock()
        cursor.execute.side_effect = errors.SyntaxError(
            """
            syntax error at or near "EXPLAIN"
            LINE 1: EXPLAIN DROP TABLE birth_names
                            ^
            """
        )
        sql = "DROP TABLE birth_names"
        with self.assertRaises(errors.SyntaxError):
            PostgresEngineSpec.estimate_statement_cost(sql, cursor)

    def test_query_cost_formatter_example_costs(self):
        """
        DB Eng Specs (postgres): Test test_query_cost_formatter example costs
        """
        raw_cost = [
            {"Start-up cost": 0.00, "Total cost": 1537.91,},
            {"Start-up cost": 10.00, "Total cost": 1537.00,},
        ]
        result = PostgresEngineSpec.query_cost_formatter(raw_cost)
        self.assertEqual(
            result,
            [
                {"Start-up cost": "0.0", "Total cost": "1537.91",},
                {"Start-up cost": "10.0", "Total cost": "1537.0",},
            ],
        )

    def test_extract_errors(self):
        """
        Test that custom error messages are extracted correctly.
        """
        msg = 'psql: error: FATAL:  role "testuser" does not exist'
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                error_type=SupersetErrorType.CONNECTION_INVALID_USERNAME_ERROR,
                message='The username "testuser" does not exist.',
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1012,
                            "message": (
                                "Issue 1012 - The username provided when "
                                "connecting to a database is not valid."
                            ),
                        },
                    ],
                    "invalid": ["username"],
                },
            )
        ]

        msg = (
            'psql: error: could not translate host name "locahost" to address: '
            "nodename nor servname provided, or not known"
        )
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                error_type=SupersetErrorType.CONNECTION_INVALID_HOSTNAME_ERROR,
                message='The hostname "locahost" cannot be resolved.',
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1007,
                            "message": "Issue 1007 - The hostname provided "
                            "can't be resolved.",
                        }
                    ],
                    "invalid": ["host"],
                },
            )
        ]

        msg = dedent(
            """
psql: error: could not connect to server: Connection refused
        Is the server running on host "localhost" (::1) and accepting
        TCP/IP connections on port 12345?
could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 12345?
            """
        )
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                error_type=SupersetErrorType.CONNECTION_PORT_CLOSED_ERROR,
                message='Port 12345 on hostname "localhost" refused the connection.',
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {"code": 1008, "message": "Issue 1008 - The port is closed."}
                    ],
                    "invalid": ["host", "port"],
                },
            )
        ]

        msg = dedent(
            """
psql: error: could not connect to server: Operation timed out
        Is the server running on host "example.com" (93.184.216.34) and accepting
        TCP/IP connections on port 12345?
            """
        )
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                error_type=SupersetErrorType.CONNECTION_HOST_DOWN_ERROR,
                message=(
                    'The host "example.com" might be down, '
                    "and can't be reached on port 12345."
                ),
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1009,
                            "message": "Issue 1009 - The host might be down, "
                            "and can't be reached on the provided port.",
                        }
                    ],
                    "invalid": ["host", "port"],
                },
            )
        ]

        # response with IP only
        msg = dedent(
            """
psql: error: could not connect to server: Operation timed out
        Is the server running on host "93.184.216.34" and accepting
        TCP/IP connections on port 12345?
            """
        )
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                error_type=SupersetErrorType.CONNECTION_HOST_DOWN_ERROR,
                message=(
                    'The host "93.184.216.34" might be down, '
                    "and can't be reached on port 12345."
                ),
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1009,
                            "message": "Issue 1009 - The host might be down, "
                            "and can't be reached on the provided port.",
                        }
                    ],
                    "invalid": ["host", "port"],
                },
            )
        ]

        msg = 'FATAL:  password authentication failed for user "postgres"'
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                error_type=SupersetErrorType.CONNECTION_INVALID_PASSWORD_ERROR,
                message=('The password provided for username "postgres" is incorrect.'),
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1013,
                            "message": (
                                "Issue 1013 - The password provided when "
                                "connecting to a database is not valid."
                            ),
                        },
                    ],
                    "invalid": ["username", "password"],
                },
            )
        ]

        msg = 'database "badDB" does not exist'
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                message='Unable to connect to database "badDB".',
                error_type=SupersetErrorType.CONNECTION_UNKNOWN_DATABASE_ERROR,
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1015,
                            "message": (
                                "Issue 1015 - Either the database is spelled "
                                "incorrectly or does not exist.",
                            ),
                        }
                    ],
                    "invalid": ["database"],
                },
            )
        ]

        msg = "no password supplied"
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                message="Please re-enter the password.",
                error_type=SupersetErrorType.CONNECTION_ACCESS_DENIED_ERROR,
                level=ErrorLevel.ERROR,
                extra={
                    "invalid": ["password"],
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1014,
                            "message": "Issue 1014 - Either the username or the password is wrong.",
                        },
                        {
                            "code": 1015,
                            "message": "Issue 1015 - Either the database is spelled incorrectly or does not exist.",
                        },
                    ],
                },
            )
        ]


def test_base_parameters_mixin():
    parameters = {
        "username": "username",
        "password": "password",
        "host": "localhost",
        "port": 5432,
        "database": "dbname",
        "query": {"foo": "bar"},
        "encryption": True,
    }
    sqlalchemy_uri = PostgresEngineSpec.build_sqlalchemy_uri(parameters)
    assert sqlalchemy_uri == (
        "postgresql+psycopg2://username:password@localhost:5432/dbname?"
        "foo=bar&sslmode=verify-ca"
    )

    parameters_from_uri = PostgresEngineSpec.get_parameters_from_uri(sqlalchemy_uri)
    assert parameters_from_uri == parameters

    json_schema = PostgresEngineSpec.parameters_json_schema()
    assert json_schema == {
        "type": "object",
        "properties": {
            "port": {
                "type": "integer",
                "format": "int32",
                "description": "Database port",
            },
            "password": {"type": "string", "nullable": True, "description": "Password"},
            "host": {"type": "string", "description": "Hostname or IP address"},
            "username": {"type": "string", "nullable": True, "description": "Username"},
            "query": {
                "type": "object",
                "description": "Additional parameters",
                "additionalProperties": {},
            },
            "database": {"type": "string", "description": "Database name"},
            "encryption": {
                "type": "boolean",
                "description": "Use an encrypted connection to the database",
            },
        },
        "required": ["database", "host", "port", "username"],
    }


def test_generic_type():
    type_expectations = (
        # Numeric
        ("SMALLINT", GenericDataType.NUMERIC),
        ("INTEGER", GenericDataType.NUMERIC),
        ("BIGINT", GenericDataType.NUMERIC),
        ("DECIMAL", GenericDataType.NUMERIC),
        ("NUMERIC", GenericDataType.NUMERIC),
        ("REAL", GenericDataType.NUMERIC),
        ("DOUBLE PRECISION", GenericDataType.NUMERIC),
        ("MONEY", GenericDataType.NUMERIC),
        # String
        ("CHAR", GenericDataType.STRING),
        ("VARCHAR", GenericDataType.STRING),
        ("TEXT", GenericDataType.STRING),
        # Temporal
        ("DATE", GenericDataType.TEMPORAL),
        ("TIMESTAMP", GenericDataType.TEMPORAL),
        ("TIME", GenericDataType.TEMPORAL),
        # Boolean
        ("BOOLEAN", GenericDataType.BOOLEAN),
    )
    assert_generic_types(PostgresEngineSpec, type_expectations)