# -*- coding: utf-8 -*-
"""
oauthlib.oauth2.rfc6749
~~~~~~~~~~~~~~~~~~~~~~~

This module is an implementation of various logic needed
for consuming and providing OAuth 2.0 RFC6749.
"""
from __future__ import absolute_import, unicode_literals

import functools
import logging

from ..errors import (FatalClientError, OAuth2Error, ServerError,
                      TemporarilyUnavailableError, InvalidRequestError,
                      InvalidClientError, UnsupportedTokenTypeError)

log = logging.getLogger(__name__)


class BaseEndpoint(object):

    def __init__(self):
        self._available = True
        self._catch_errors = False

    @property
    def available(self):
        return self._available

    @available.setter
    def available(self, available):
        self._available = available

    @property
    def catch_errors(self):
        return self._catch_errors

    @catch_errors.setter
    def catch_errors(self, catch_errors):
        self._catch_errors = catch_errors

    def _raise_on_missing_token(self, request):
        """Raise error on missing token."""
        if not request.token:
            raise InvalidRequestError(request=request,
                                      description='Missing token parameter.')
    def _raise_on_invalid_client(self, request):
        """Raise on failed client authentication."""
        if self.request_validator.client_authentication_required(request):
            if not self.request_validator.authenticate_client(request):
                log.debug('Client authentication failed, %r.', request)
                raise InvalidClientError(request=request)
        elif not self.request_validator.authenticate_client_id(request.client_id, request):
            log.debug('Client authentication failed, %r.', request)
            raise InvalidClientError(request=request)

    def _raise_on_unsupported_token(self, request):
        """Raise on unsupported tokens."""
        if (request.token_type_hint and
            request.token_type_hint in self.valid_token_types and
            request.token_type_hint not in self.supported_token_types):
            raise UnsupportedTokenTypeError(request=request)


def catch_errors_and_unavailability(f):
    @functools.wraps(f)
    def wrapper(endpoint, uri, *args, **kwargs):
        if not endpoint.available:
            e = TemporarilyUnavailableError()
            log.info('Endpoint unavailable, ignoring request %s.' % uri)
            return {}, e.json, 503

        if endpoint.catch_errors:
            try:
                return f(endpoint, uri, *args, **kwargs)
            except OAuth2Error:
                raise
            except FatalClientError:
                raise
            except Exception as e:
                error = ServerError()
                log.warning(
                    'Exception caught while processing request, %s.' % e)
                return {}, error.json, 500
        else:
            return f(endpoint, uri, *args, **kwargs)
    return wrapper
