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from textwrap import dedent
from unittest import mock

from flask.ctx import AppContext
from sqlalchemy import column, literal_column
from sqlalchemy.dialects import postgresql

from superset.db_engine_specs import load_engine_specs
from superset.db_engine_specs.postgres import PostgresEngineSpec
from superset.errors import ErrorLevel, SupersetError, SupersetErrorType
from superset.models.sql_lab import Query
from superset.utils.database import get_example_database
from tests.integration_tests.db_engine_specs.base_tests import TestDbEngineSpec
from tests.integration_tests.fixtures.certificates import ssl_certificate
from tests.integration_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
        )
        assert 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_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
        """
        backends = set()
        for engine in load_engine_specs():
            backends.add(engine.engine)
            backends.update(engine.engine_aliases)
        assert "postgres" in backends

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

    def test_extras_with_ssl_default(self):
        database = mock.Mock()
        database.extra = default_db_extra
        database.server_cert = ssl_certificate
        extras = PostgresEngineSpec.get_extra_params(database)
        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):
        database = mock.Mock()
        database.extra = default_db_extra.replace(
            '"engine_params": {}',
            '"engine_params": {"connect_args": {"sslmode": "verify-ca"}}',
        )
        database.server_cert = ssl_certificate
        extras = PostgresEngineSpec.get_extra_params(database)
        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.",
                        },
                    ],
                },
            )
        ]

        msg = 'syntax error at or near "fromm"'
        result = PostgresEngineSpec.extract_errors(Exception(msg))
        assert result == [
            SupersetError(
                message='Please check your query for syntax errors at or near "fromm". Then, try running your query again.',
                error_type=SupersetErrorType.SYNTAX_ERROR,
                level=ErrorLevel.ERROR,
                extra={
                    "engine_name": "PostgreSQL",
                    "issue_codes": [
                        {
                            "code": 1030,
                            "message": "Issue 1030 - The query has a syntax error.",
                        }
                    ],
                },
            )
        ]

    @mock.patch("sqlalchemy.engine.Engine.connect")
    def test_get_cancel_query_id(self, engine_mock):
        query = Query()
        cursor_mock = engine_mock.return_value.__enter__.return_value
        cursor_mock.fetchone.return_value = [123]
        assert PostgresEngineSpec.get_cancel_query_id(cursor_mock, query) == 123

    @mock.patch("sqlalchemy.engine.Engine.connect")
    def test_cancel_query(self, engine_mock):
        query = Query()
        cursor_mock = engine_mock.return_value.__enter__.return_value
        assert PostgresEngineSpec.cancel_query(cursor_mock, query, 123) is True

    @mock.patch("sqlalchemy.engine.Engine.connect")
    def test_cancel_query_failed(self, engine_mock):
        query = Query()
        cursor_mock = engine_mock.raiseError.side_effect = Exception()
        assert PostgresEngineSpec.cancel_query(cursor_mock, query, 123) is False


def test_base_parameters_mixin():
    parameters = {
        "username": "username",
        "password": "password",
        "host": "localhost",
        "port": 5432,
        "database": "dbname",
        "query": {"foo": "bar"},
        "encryption": True,
    }
    encrypted_extra = None
    sqlalchemy_uri = PostgresEngineSpec.build_sqlalchemy_uri(
        parameters, encrypted_extra
    )
    assert sqlalchemy_uri == (
        "postgresql+psycopg2://username:password@localhost:5432/dbname?"
        "foo=bar&sslmode=require"
    )

    parameters_from_uri = PostgresEngineSpec.get_parameters_from_uri(sqlalchemy_uri)
    assert parameters_from_uri == {
        "username": "username",
        "password": "password",
        "host": "localhost",
        "port": 5432,
        "database": "dbname",
        "query": {"foo": "bar"},
        "encryption": True,
    }

    json_schema = PostgresEngineSpec.parameters_json_schema()
    assert json_schema == {
        "type": "object",
        "properties": {
            "encryption": {
                "type": "boolean",
                "description": "Use an encrypted connection to the database",
            },
            "host": {"type": "string", "description": "Hostname or IP address"},
            "database": {"type": "string", "description": "Database name"},
            "port": {
                "type": "integer",
                "minimum": 0,
                "maximum": 65536,
                "description": "Database port",
            },
            "password": {"type": "string", "nullable": True, "description": "Password"},
            "username": {"type": "string", "nullable": True, "description": "Username"},
            "query": {
                "type": "object",
                "description": "Additional parameters",
                "additionalProperties": {},
            },
            "ssh": {
                "description": "Use an ssh tunnel connection to the database",
                "type": "boolean",
            },
        },
        "required": ["database", "host", "port", "username"],
    }


def test_get_catalog_names(app_context: AppContext) -> None:
    """
    Test the ``get_catalog_names`` method.
    """
    database = get_example_database()

    if database.backend != "postgresql":
        return

    with database.get_inspector_with_context() as inspector:
        assert PostgresEngineSpec.get_catalog_names(database, inspector) == [
            "postgres",
            "superset",
        ]