import pytest as pytest

from sanic.exceptions import InvalidUsage
from sanic.response import text, HTTPResponse
from sanic.views import HTTPMethodView, CompositionView
from sanic.blueprints import Blueprint
from sanic.request import Request
from sanic.constants import HTTP_METHODS


@pytest.mark.parametrize('method', HTTP_METHODS)
def test_methods(app, method):

    class DummyView(HTTPMethodView):

        async def get(self, request):
            assert request.stream is None
            return text('', headers={'method': 'GET'})

        def post(self, request):
            return text('', headers={'method': 'POST'})

        async def put(self, request):
            return text('', headers={'method': 'PUT'})

        def head(self, request):
            return text('', headers={'method': 'HEAD'})

        def options(self, request):
            return text('', headers={'method': 'OPTIONS'})

        async def patch(self, request):
            return text('', headers={'method': 'PATCH'})

        def delete(self, request):
            return text('', headers={'method': 'DELETE'})

    app.add_route(DummyView.as_view(), '/')
    assert app.is_request_stream is False

    request, response = getattr(app.test_client, method.lower())('/')
    assert response.headers['method'] == method


def test_unexisting_methods(app):

    class DummyView(HTTPMethodView):

        def get(self, request):
            return text('I am get method')

    app.add_route(DummyView.as_view(), '/')
    request, response = app.test_client.get('/')
    assert response.text == 'I am get method'
    request, response = app.test_client.post('/')
    assert response.text == 'Error: Method POST not allowed for URL /'


def test_argument_methods(app):

    class DummyView(HTTPMethodView):

        def get(self, request, my_param_here):
            return text('I am get method with %s' % my_param_here)

    app.add_route(DummyView.as_view(), '/<my_param_here>')

    request, response = app.test_client.get('/test123')

    assert response.text == 'I am get method with test123'


def test_with_bp(app):
    bp = Blueprint('test_text')

    class DummyView(HTTPMethodView):

        def get(self, request):
            assert request.stream is None
            return text('I am get method')

    bp.add_route(DummyView.as_view(), '/')

    app.blueprint(bp)
    request, response = app.test_client.get('/')

    assert app.is_request_stream is False
    assert response.text == 'I am get method'


def test_with_bp_with_url_prefix(app):
    bp = Blueprint('test_text', url_prefix='/test1')

    class DummyView(HTTPMethodView):

        def get(self, request):
            return text('I am get method')

    bp.add_route(DummyView.as_view(), '/')

    app.blueprint(bp)
    request, response = app.test_client.get('/test1/')

    assert response.text == 'I am get method'


def test_with_middleware(app):

    class DummyView(HTTPMethodView):

        def get(self, request):
            return text('I am get method')

    app.add_route(DummyView.as_view(), '/')

    results = []

    @app.middleware
    async def handler(request):
        results.append(request)

    request, response = app.test_client.get('/')

    assert response.text == 'I am get method'
    assert type(results[0]) is Request


def test_with_middleware_response(app):
    results = []

    @app.middleware('request')
    async def process_request(request):
        results.append(request)

    @app.middleware('response')
    async def process_response(request, response):
        results.append(request)
        results.append(response)

    class DummyView(HTTPMethodView):

        def get(self, request):
            return text('I am get method')

    app.add_route(DummyView.as_view(), '/')

    request, response = app.test_client.get('/')

    assert response.text == 'I am get method'
    assert type(results[0]) is Request
    assert type(results[1]) is Request
    assert isinstance(results[2], HTTPResponse)


def test_with_custom_class_methods(app):

    class DummyView(HTTPMethodView):
        global_var = 0

        def _iternal_method(self):
            self.global_var += 10

        def get(self, request):
            self._iternal_method()
            return text('I am get method and global var '
                        'is {}'.format(self.global_var))

    app.add_route(DummyView.as_view(), '/')
    request, response = app.test_client.get('/')
    assert response.text == 'I am get method and global var is 10'


def test_with_decorator(app):
    results = []

    def stupid_decorator(view):
        def decorator(*args, **kwargs):
            results.append(1)
            return view(*args, **kwargs)
        return decorator

    class DummyView(HTTPMethodView):
        decorators = [stupid_decorator]

        def get(self, request):
            return text('I am get method')

    app.add_route(DummyView.as_view(), '/')
    request, response = app.test_client.get('/')
    assert response.text == 'I am get method'
    assert results[0] == 1


def test_composition_view_rejects_incorrect_methods():
    def foo(request):
        return text('Foo')

    view = CompositionView()

    with pytest.raises(InvalidUsage) as e:
        view.add(['GET', 'FOO'], foo)

    assert str(e.value) == 'FOO is not a valid HTTP method.'


def test_composition_view_rejects_duplicate_methods():
    def foo(request):
        return text('Foo')

    view = CompositionView()

    with pytest.raises(InvalidUsage) as e:
        view.add(['GET', 'POST', 'GET'], foo)

    assert str(e.value) == 'Method GET is already registered.'


@pytest.mark.parametrize('method', HTTP_METHODS)
def test_composition_view_runs_methods_as_expected(app, method):
    view = CompositionView()

    def first(request):
        assert request.stream is None
        return text('first method')
    view.add(['GET', 'POST', 'PUT'], first)
    view.add(['DELETE', 'PATCH'], lambda x: text('second method'))

    app.add_route(view, '/')
    assert app.is_request_stream is False

    if method in ['GET', 'POST', 'PUT']:
        request, response = getattr(app.test_client, method.lower())('/')
        assert response.text == 'first method'

    if method in ['DELETE', 'PATCH']:
        request, response = getattr(app.test_client, method.lower())('/')
        assert response.text == 'second method'


@pytest.mark.parametrize('method', HTTP_METHODS)
def test_composition_view_rejects_invalid_methods(app, method):
    view = CompositionView()
    view.add(['GET', 'POST', 'PUT'], lambda x: text('first method'))

    app.add_route(view, '/')

    if method in ['GET', 'POST', 'PUT']:
        request, response = getattr(app.test_client, method.lower())('/')
        assert response.status == 200
        assert response.text == 'first method'

    if method in ['DELETE', 'PATCH']:
        request, response = getattr(app.test_client, method.lower())('/')
        assert response.status == 405