from django.core.handlers.wsgi import WSGIHandler
from django.test import SimpleTestCase, override_settings
from django.test.client import (
    BOUNDARY, MULTIPART_CONTENT, FakePayload, encode_multipart,
)


class ExceptionHandlerTests(SimpleTestCase):

    def get_suspicious_environ(self):
        payload = FakePayload('a=1&a=2&a=3\r\n')
        return {
            'REQUEST_METHOD': 'POST',
            'CONTENT_TYPE': 'application/x-www-form-urlencoded',
            'CONTENT_LENGTH': len(payload),
            'wsgi.input': payload,
            'SERVER_NAME': 'test',
            'SERVER_PORT': '8000',
        }

    @override_settings(DATA_UPLOAD_MAX_MEMORY_SIZE=12)
    def test_data_upload_max_memory_size_exceeded(self):
        response = WSGIHandler()(self.get_suspicious_environ(), lambda *a, **k: None)
        self.assertEqual(response.status_code, 400)

    @override_settings(DATA_UPLOAD_MAX_NUMBER_FIELDS=2)
    def test_data_upload_max_number_fields_exceeded(self):
        response = WSGIHandler()(self.get_suspicious_environ(), lambda *a, **k: None)
        self.assertEqual(response.status_code, 400)

    @override_settings(DATA_UPLOAD_MAX_NUMBER_FILES=2)
    def test_data_upload_max_number_files_exceeded(self):
        payload = FakePayload(
            encode_multipart(
                BOUNDARY,
                {
                    "a.txt": "Hello World!",
                    "b.txt": "Hello Django!",
                    "c.txt": "Hello Python!",
                },
            )
        )
        environ = {
            "REQUEST_METHOD": "POST",
            "CONTENT_TYPE": MULTIPART_CONTENT,
            "CONTENT_LENGTH": len(payload),
            "wsgi.input": payload,
            "SERVER_NAME": "test",
            "SERVER_PORT": "8000",
        }

        response = WSGIHandler()(environ, lambda *a, **k: None)
        self.assertEqual(response.status_code, 400)