# Copyright 2014 Huawei Technologies Co. Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Exception and its handler."""
from compass.api import app
from compass.api import util


class ObjectDoesNotExist(Exception):
    """Define the exception for referring non-existing object."""
    def __init__(self, message):
        super(ObjectDoesNotExist, self).__init__(message)
        self.message = message

    def __str__(self):
        return repr(self.message)


class UserInvalidUsage(Exception):
    """Define the exception for fault usage of users."""
    def __init__(self, message):
        super(UserInvalidUsage, self).__init__(message)
        self.message = message

    def __str__(self):
        return repr(self.message)


class ObjectDuplicateError(Exception):
    """Define the duplicated object exception."""
    def __init__(self, message):
        super(ObjectDuplicateError, self).__init__(message)
        self.message = message

    def __str__(self):
        return repr(self.message)


class InputMissingError(Exception):
    """Define the insufficient input exception."""
    def __init__(self, message):
        super(InputMissingError, self).__init__(message)
        self.message = message

    def __str__(self):
        return repr(self.message)


class MethodNotAllowed(Exception):
    """Define the exception which invalid method is called."""
    def __init__(self, message):
        super(MethodNotAllowed, self).__init__(message)
        self.message = message

    def __str__(self):
        return repr(self.message)


class InvalidUserInfo(Exception):
    """Define the Exception for incorrect user information."""
    def __init__(self, message):
        super(InvalidUserInfo, self).__init__(message)
        self.message = message


@app.errorhandler(ObjectDoesNotExist)
def handle_not_exist(error, failed_objs=None):
    """Handler of ObjectDoesNotExist Exception."""

    message = {'status': 'Not Found',
               'message': error.message}

    if failed_objs and isinstance(failed_objs, dict):
        message.update(failed_objs)

    return util.make_json_response(404, message)


@app.errorhandler(UserInvalidUsage)
def handle_invalid_usage(error):
    """Handler of UserInvalidUsage Exception."""

    message = {
        'status': 'Invalid parameters',
        'message': error.message
    }

    return util.make_json_response(400, message)


@app.errorhandler(InputMissingError)
def handle_mssing_input(error):
    """Handler of InputMissingError Exception."""

    message = {
        'status': 'Insufficient data',
        'message': error.message
    }

    return util.make_json_response(400, message)


@app.errorhandler(ObjectDuplicateError)
def handle_duplicate_object(error, failed_objs=None):
    """Handler of ObjectDuplicateError Exception."""

    message = {
        'status': 'Conflict Error',
        'message': error.message
    }

    if failed_objs and isinstance(failed_objs, dict):
        message.update(failed_objs)

    return util.make_json_response(409, message)


@app.errorhandler(MethodNotAllowed)
def handle_not_allowed_method(error):
    """Handler of MethodNotAllowed Exception."""

    message = {
        "status": "Method Not Allowed",
        "message": "The method is not allowed to use"
    }
    return util.make_json_response(405, message)


@app.errorhandler(InvalidUserInfo)
def handle_invalid_user_info(error):
    """Handler of InvalidUserInfo Exception."""
    message = {"status": "Incorrect User Info",
               "message": error.message}
    return util.make_json_response(401, message)