import json

import pytest

try:
    from urllib import urlencode
except ImportError:
    from urllib.parse import urlencode


def url_string(string='/graphql', **url_params):
    if url_params:
        string += '?' + urlencode(url_params)

    return string


def batch_url_string(**url_params):
    return url_string('/graphql/batch', **url_params)


def response_json(response):
    return json.loads(response.content.decode())


j = lambda **kwargs: json.dumps(kwargs)
jl = lambda **kwargs: json.dumps([kwargs])


def test_graphiql_is_enabled(client):
    response = client.get(url_string(), HTTP_ACCEPT='text/html')
    assert response.status_code == 200


def test_allows_get_with_query_param(client):
    response = client.get(url_string(query='{test}'))

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello World"}
    }


def test_allows_get_with_variable_values(client):
    response = client.get(url_string(
        query='query helloWho($who: String){ test(who: $who) }',
        variables=json.dumps({'who': "Dolly"})
    ))

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }


def test_allows_get_with_operation_name(client):
    response = client.get(url_string(
        query='''
        query helloYou { test(who: "You"), ...shared }
        query helloWorld { test(who: "World"), ...shared }
        query helloDolly { test(who: "Dolly"), ...shared }
        fragment shared on QueryRoot {
          shared: test(who: "Everyone")
        }
        ''',
        operationName='helloWorld'
    ))

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {
            'test': 'Hello World',
            'shared': 'Hello Everyone'
        }
    }


def test_reports_validation_errors(client):
    response = client.get(url_string(
        query='{ test, unknownOne, unknownTwo }'
    ))

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [
            {
                'message': 'Cannot query field "unknownOne" on type "QueryRoot".',
                'locations': [{'line': 1, 'column': 9}]
            },
            {
                'message': 'Cannot query field "unknownTwo" on type "QueryRoot".',
                'locations': [{'line': 1, 'column': 21}]
            }
        ]
    }


def test_errors_when_missing_operation_name(client):
    response = client.get(url_string(
        query='''
        query TestQuery { test }
        mutation TestMutation { writeTest { test } }
        '''
    ))

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [
            {
                'message': 'Must provide operation name if query contains multiple operations.'
            }
        ]
    }


def test_errors_when_sending_a_mutation_via_get(client):
    response = client.get(url_string(
        query='''
        mutation TestMutation { writeTest { test } }
        '''
    ))
    assert response.status_code == 405
    assert response_json(response) == {
        'errors': [
            {
                'message': 'Can only perform a mutation operation from a POST request.'
            }
        ]
    }


def test_errors_when_selecting_a_mutation_within_a_get(client):
    response = client.get(url_string(
        query='''
        query TestQuery { test }
        mutation TestMutation { writeTest { test } }
        ''',
        operationName='TestMutation'
    ))

    assert response.status_code == 405
    assert response_json(response) == {
        'errors': [
            {
                'message': 'Can only perform a mutation operation from a POST request.'
            }
        ]
    }


def test_allows_mutation_to_exist_within_a_get(client):
    response = client.get(url_string(
        query='''
        query TestQuery { test }
        mutation TestMutation { writeTest { test } }
        ''',
        operationName='TestQuery'
    ))

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello World"}
    }


def test_allows_post_with_json_encoding(client):
    response = client.post(url_string(), j(query='{test}'), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello World"}
    }


def test_batch_allows_post_with_json_encoding(client):
    response = client.post(batch_url_string(), jl(id=1, query='{test}'), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == [{
        'id': 1,
        'data': {'test': "Hello World"},
        'status': 200,
    }]


def test_batch_fails_if_is_empty(client):
    response = client.post(batch_url_string(), '[]', 'application/json')

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'Received an empty list in the batch request.'}]
    }


def test_allows_sending_a_mutation_via_post(client):
    response = client.post(url_string(), j(query='mutation TestMutation { writeTest { test } }'), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'writeTest': {'test': 'Hello World'}}
    }


def test_allows_post_with_url_encoding(client):
    response = client.post(url_string(), urlencode(dict(query='{test}')), 'application/x-www-form-urlencoded')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello World"}
    }


def test_supports_post_json_query_with_string_variables(client):
    response = client.post(url_string(), j(
        query='query helloWho($who: String){ test(who: $who) }',
        variables=json.dumps({'who': "Dolly"})
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }



def test_batch_supports_post_json_query_with_string_variables(client):
    response = client.post(batch_url_string(), jl(
        id=1,
        query='query helloWho($who: String){ test(who: $who) }',
        variables=json.dumps({'who': "Dolly"})
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == [{
        'id': 1,
        'data': {'test': "Hello Dolly"},
        'status': 200,
    }]


def test_supports_post_json_query_with_json_variables(client):
    response = client.post(url_string(), j(
        query='query helloWho($who: String){ test(who: $who) }',
        variables={'who': "Dolly"}
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }


def test_batch_supports_post_json_query_with_json_variables(client):
    response = client.post(batch_url_string(), jl(
        id=1,
        query='query helloWho($who: String){ test(who: $who) }',
        variables={'who': "Dolly"}
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == [{
        'id': 1,
        'data': {'test': "Hello Dolly"},
        'status': 200,
    }]


def test_supports_post_url_encoded_query_with_string_variables(client):
    response = client.post(url_string(), urlencode(dict(
        query='query helloWho($who: String){ test(who: $who) }',
        variables=json.dumps({'who': "Dolly"})
    )), 'application/x-www-form-urlencoded')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }


def test_supports_post_json_quey_with_get_variable_values(client):
    response = client.post(url_string(
        variables=json.dumps({'who': "Dolly"})
    ), j(
        query='query helloWho($who: String){ test(who: $who) }',
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }


def test_post_url_encoded_query_with_get_variable_values(client):
    response = client.post(url_string(
        variables=json.dumps({'who': "Dolly"})
    ), urlencode(dict(
        query='query helloWho($who: String){ test(who: $who) }',
    )), 'application/x-www-form-urlencoded')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }


def test_supports_post_raw_text_query_with_get_variable_values(client):
    response = client.post(url_string(
        variables=json.dumps({'who': "Dolly"})
    ),
        'query helloWho($who: String){ test(who: $who) }',
        'application/graphql'
    )

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {'test': "Hello Dolly"}
    }


def test_allows_post_with_operation_name(client):
    response = client.post(url_string(), j(
        query='''
        query helloYou { test(who: "You"), ...shared }
        query helloWorld { test(who: "World"), ...shared }
        query helloDolly { test(who: "Dolly"), ...shared }
        fragment shared on QueryRoot {
          shared: test(who: "Everyone")
        }
        ''',
        operationName='helloWorld'
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {
            'test': 'Hello World',
            'shared': 'Hello Everyone'
        }
    }


def test_batch_allows_post_with_operation_name(client):
    response = client.post(batch_url_string(), jl(
        id=1,
        query='''
        query helloYou { test(who: "You"), ...shared }
        query helloWorld { test(who: "World"), ...shared }
        query helloDolly { test(who: "Dolly"), ...shared }
        fragment shared on QueryRoot {
          shared: test(who: "Everyone")
        }
        ''',
        operationName='helloWorld'
    ), 'application/json')

    assert response.status_code == 200
    assert response_json(response) == [{
        'id': 1,
        'data': {
            'test': 'Hello World',
            'shared': 'Hello Everyone'
        },
        'status': 200,
    }]


def test_allows_post_with_get_operation_name(client):
    response = client.post(url_string(
        operationName='helloWorld'
    ), '''
    query helloYou { test(who: "You"), ...shared }
    query helloWorld { test(who: "World"), ...shared }
    query helloDolly { test(who: "Dolly"), ...shared }
    fragment shared on QueryRoot {
      shared: test(who: "Everyone")
    }
    ''',
        'application/graphql')

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {
            'test': 'Hello World',
            'shared': 'Hello Everyone'
        }
    }


@pytest.mark.urls('graphene_django.tests.urls_pretty')
def test_supports_pretty_printing(client):
    response = client.get(url_string(query='{test}'))

    assert response.content.decode() == (
        '{\n'
        '  "data": {\n'
        '    "test": "Hello World"\n'
        '  }\n'
        '}'
    )


def test_supports_pretty_printing_by_request(client):
    response = client.get(url_string(query='{test}', pretty='1'))

    assert response.content.decode() == (
        '{\n'
        '  "data": {\n'
        '    "test": "Hello World"\n'
        '  }\n'
        '}'
    )


def test_handles_field_errors_caught_by_graphql(client):
    response = client.get(url_string(query='{thrower}'))
    assert response.status_code == 200
    assert response_json(response) == {
        'data': None,
        'errors': [{'locations': [{'column': 2, 'line': 1}], 'message': 'Throws!'}]
    }


def test_handles_syntax_errors_caught_by_graphql(client):
    response = client.get(url_string(query='syntaxerror'))
    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'locations': [{'column': 1, 'line': 1}],
                    'message': 'Syntax Error GraphQL request (1:1) '
                               'Unexpected Name "syntaxerror"\n\n1: syntaxerror\n   ^\n'}]
    }


def test_handles_errors_caused_by_a_lack_of_query(client):
    response = client.get(url_string())

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'Must provide query string.'}]
    }


def test_handles_not_expected_json_bodies(client):
    response = client.post(url_string(), '[]', 'application/json')

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'The received data is not a valid JSON query.'}]
    }


def test_handles_invalid_json_bodies(client):
    response = client.post(url_string(), '[oh}', 'application/json')

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'POST body sent invalid JSON.'}]
    }


def test_handles_django_request_error(client, monkeypatch):
    def mocked_read(*args):
        raise IOError("foo-bar")

    monkeypatch.setattr("django.http.request.HttpRequest.read", mocked_read)

    valid_json = json.dumps(dict(foo='bar'))
    response = client.post(url_string(), valid_json, 'application/json')

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'foo-bar'}]
    }


def test_handles_incomplete_json_bodies(client):
    response = client.post(url_string(), '{"query":', 'application/json')

    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'POST body sent invalid JSON.'}]
    }


def test_handles_plain_post_text(client):
    response = client.post(url_string(
        variables=json.dumps({'who': "Dolly"})
    ),
        'query helloWho($who: String){ test(who: $who) }',
        'text/plain'
    )
    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'Must provide query string.'}]
    }


def test_handles_poorly_formed_variables(client):
    response = client.get(url_string(
        query='query helloWho($who: String){ test(who: $who) }',
        variables='who:You'
    ))
    assert response.status_code == 400
    assert response_json(response) == {
        'errors': [{'message': 'Variables are invalid JSON.'}]
    }


def test_handles_unsupported_http_methods(client):
    response = client.put(url_string(query='{test}'))
    assert response.status_code == 405
    assert response['Allow'] == 'GET, POST'
    assert response_json(response) == {
        'errors': [{'message': 'GraphQL only supports GET and POST requests.'}]
    }


def test_passes_request_into_context_request(client):
    response = client.get(url_string(query='{request}', q='testing'))

    assert response.status_code == 200
    assert response_json(response) == {
        'data': {
            'request': 'testing'
        }
    }