"""Exceptions module for lambdas."""

from src import status
from constants import errors


class UnexpectedEventBody(Exception):
    """
    Exceptions that raises if input event doesn't have needed arguments.

    Attributes:
       expected_args (list): Expected event body arguments.

    """

    def __init__(self, expected_args):
        """Show exception message.

        Args:
            expected_args (list): Expected event body arguments.
        """
        args_sting = ' '.join(expected_args)
        Exception.__init__(
            self, ("Expected event arguments: {args} haven\'t been provided"
                   .format(args=args_sting))
        )


class LoggedException(Exception):
    """Exception to avoid propagation of general notification messages."""


class StopProcessingException(Exception):
    """Exception raised if asset processing must be stopped."""


class AssetUploadAlreadyHandled(Exception):
    """Exception raised if asset upload has already been handled."""


def notify_and_raise(
        function, error_status, error_code,
        filename, bucket,
        error_params=None, input_params=None):
    """Send status notification and raise expection.

    Args:
        function (str): Lambda function name that causes an error.
        error_status (str): Error status for lambda function.
        error_code (str): Error code.
        filename (str): Current processed asset filename.
        bucket (str): Current processed asset source bucket name.
        error_params (dict): Additional error params.
        input_params (dict): Lambda additional input params for reporting.

    """
    if not error_params:
        error_params = {}
    error_message = errors.ERROR_MESSAGES.get(
        error_code, 'Unknown Error').format(**error_params)
    status.send_general_status(
        function=function,
        status=error_status,
        filename=filename,
        error_code=error_code,
        description=error_message,
        bucket=bucket,
        input_params=input_params,
    )
    raise LoggedException(error_message)