from __future__ import annotations


class MySQLBaseException(Exception):
    """Base exception for this mysql helper library."""

    def __init__(
        self,
        message: str,
        error_code: str | None = None,
        original_error: Exception | None = None,
    ):
        super().__init__(message)
        self.message = message
        self.error_code = error_code
        self.original_error = original_error


class MySQLConnectionError(MySQLBaseException):
    """Raised when connecting to MySQL fails."""


class MySQLConfigError(MySQLBaseException):
    """Raised when configuration is invalid."""


class MySQLQueryError(MySQLBaseException):
    """Raised when executing a SQL statement fails."""


class MySQLTransactionError(MySQLBaseException):
    """Raised when a transaction fails."""


class MySQLPoolError(MySQLBaseException):
    """Raised when connection pool fails."""


class MySQLValidationError(MySQLBaseException):
    """Raised when input data validation fails."""