from aiohttp.web import Application, Response, get, post, HTTPBadRequest, HTTPInternalServerError, HTTPNotFound
from json import dumps
from traceback import print_exc
from tiramisu import Config


from .dispatcher import dispatcher
from .utils import _
from .context import Context
from .error import CallError, NotAllowedError, RegistrationError
from .message import get_messages
from .logger import log
from .config import DEBUG, HTTP_PORT
from .services import load_services


def create_context(request):
    risotto_context = Context()
    risotto_context.username = request.match_info.get('username', "Anonymous")
    return risotto_context


def register(version: str,
             path: str):
    """ Decorator to register function to the http route
    """
    def decorator(function):
        if path in extra_routes:
            raise RegistrationError(f'the route {path} is already registered')
        extra_routes[path] = {'function': function,
                              'version': version}
    return decorator


class extra_route_handler:
    async def __new__(cls, request):
        kwargs = dict(request.match_info)
        kwargs['request'] = request
        kwargs['risotto_context'] = create_context(request)
        kwargs['risotto_context'].version = cls.version
        kwargs['risotto_context'].paths.append(cls.path)
        kwargs['risotto_context'].type = 'http_get'
        function_name = cls.function.__module__
        # if not 'api' function
        if function_name != 'risotto.http':
            module_name = function_name.split('.')[-2]
            kwargs['self'] = dispatcher.injected_self[module_name]
        try:
            returns = await cls.function(**kwargs)
        except NotAllowedError as err:
            raise HTTPNotFound(reason=str(err))
        except CallError as err:
            raise HTTPBadRequest(reason=str(err))
        except Exception as err:
            if DEBUG:
                print_exc()
            raise HTTPInternalServerError(reason=str(err))
        log.info_msg(kwargs['risotto_context'],
                     dict(request.match_info))
        return Response(text=dumps(returns))


async def handle(request):
    version, uri = request.match_info.get_info()['path'].rsplit('/', 2)[-2:]
    risotto_context = create_context(request)
    kwargs = await request.json()
    try:
        text = await dispatcher.call(version,
                                     uri,
                                     risotto_context,
                                     public_only=True,
                                     **kwargs)
    except NotAllowedError as err:
        raise HTTPNotFound(reason=str(err))
    except CallError as err:
        raise HTTPBadRequest(reason=str(err))
    except Exception as err:
        if DEBUG:
            print_exc()
        raise HTTPInternalServerError(reason=str(err))
    return Response(text=dumps({'response': text}))


async def api(request, risotto_context):
    global tiramisu
    if not tiramisu:
        config = Config(get_messages(load_shortarg=True,
                                      only_public=True)[1])
        config.property.read_write()
        tiramisu = config.option.dict(remotable='none')
    return tiramisu


extra_routes = {'': {'function': api,
                     'version': 'v1'}}


async def get_app(loop):
    """ build all routes
    """
    global extra_routes
    load_services()
    app = Application(loop=loop)
    routes = []
    for version, messages in dispatcher.messages.items():
        print()
        print(_('======== Registered messages ========'))
        for message in messages:
            web_message = f'/api/{version}/{message}'
            if dispatcher.messages[version][message]['public']:
                print(f'  - {web_message}')
            else:
                pattern = dispatcher.messages[version][message]['pattern']
                print(f'  - {web_message} (private {pattern})')
            routes.append(post(web_message, handle))
        print()
        print(_('======== Registered extra routes ========'))
        for path, extra in extra_routes.items():
            version = extra['version']
            path = f'/api/{version}{path}'
            extra['path'] = path
            extra_handler = type(path, (extra_route_handler,), extra)
            routes.append(get(path, extra_handler))
            print(f'  - {path} (http_get)')
        # routes.append(get(f'/api/{version}', api))
        print()
    del extra_routes
    app.add_routes(routes)
    await dispatcher.on_join()
    return await loop.create_server(app.make_handler(), '*', HTTP_PORT)


tiramisu = None