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import os
from django.conf import settings
from django.http import HttpRequest

import flex
from flex.core import validate_api_call
from flex.exceptions import ValidationError

APISPEC_PATH = os.path.join(settings.BASE_DIR, 'apispec', 'swagger.yml')
flex_schema = flex.load(APISPEC_PATH)


class FlexTestMixin:
    def assertSwaggerSchema(self, response, request=None):
        if not response.is_rendered:
            response.render()

        # 204 No Content response without content-type
        # but flex expected that header
        if 'Content-Type' not in response:
            response['Content-Type'] = ''

        try:
            validate_api_call(flex_schema,
                raw_request=(request or response.wsgi_request), raw_response=response)
        except ValidationError as e:
            self.fail(e)


# Patch original request object for prevent exception:
# "You cannot access body after reading from request's data stream"

def patched_read(self, *args, **kwargs):
    self._body = original_read(self, *args, **kwargs)
    return self._body


original_read = HttpRequest.read
HttpRequest.read = patched_read