"""JSON Draft3 Schema Validator Wrapper.

====================================

A wrapper module for a JSON Draft3 Schema validator.
JSON Draft3 Schema: https://tools.ietf.org/html/draft-zyp-json-schema-03.

This wrapper module allows:
- fail_fast=False: do not exit on first validation error.
- validating any data dict against any JSON Draft 3 validation schema.
- error response returns with body containing: |
    errors: {
        field_name1: error_message,
        field_name2: error_message
    }

(Taken from https://github.com/theorchard/ows-project-manager/)
"""


from territories import response


VALIDATION_ERROR = 'validation_error'


def filter_input(data):
    """Filter function that cleans the input data from the user.

    Args:
        data (dict): the user input to be filtered.

    Returns:
        (dict): the filtered dict
    """
    for key, value in data.items():
        if isinstance(value, str):
            data[key] = value.strip()
    return data


def validate(data, validator):
    """Validate JSON dota.

    Args:
        data (dict): the JSON to be validated.
        validator (Draft3Validator): the JSON Draft3 Schema to validate against

    Returns:
        Response: the response of the create operation.
    """
    errors = {}
    data = filter_input(data)
    for e in sorted(validator.iter_errors(data), key=str):
        if e.relative_path:
            errors[e.relative_path.pop()] = e.message
        elif e.absolute_schema_path:
            errors[e.absolute_schema_path.pop()] = e.message

    if errors:
        return response.create_error_response(
            code=VALIDATION_ERROR,
            message=errors,
            status=400)

    return response.Response(message={'status': 'ok'}, status=200)