# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.

"""
    Airflow API (Stable)

    # Overview  To facilitate management, Apache Airflow supports a range of REST API endpoints across its objects. This section provides an overview of the API design, methods, and supported use cases.  Most of the endpoints accept `JSON` as input and return `JSON` responses. This means that you must usually add the following headers to your request: ``` Content-type: application/json Accept: application/json ```  ## Resources  The term `resource` refers to a single type of object in the Airflow metadata. An API is broken up by its endpoint's corresponding resource. The name of a resource is typically plural and expressed in camelCase. Example: `dagRuns`.  Resource names are used as part of endpoint URLs, as well as in API parameters and responses.  ## CRUD Operations  The platform supports **C**reate, **R**ead, **U**pdate, and **D**elete operations on most resources. You can review the standards for these operations and their standard parameters below.  Some endpoints have special behavior as exceptions.  ### Create  To create a resource, you typically submit an HTTP `POST` request with the resource's required metadata in the request body. The response returns a `201 Created` response code upon success with the resource's metadata, including its internal `id`, in the response body.  ### Read  The HTTP `GET` request can be used to read a resource or to list a number of resources.  A resource's `id` can be submitted in the request parameters to read a specific resource. The response usually returns a `200 OK` response code upon success, with the resource's metadata in the response body.  If a `GET` request does not include a specific resource `id`, it is treated as a list request. The response usually returns a `200 OK` response code upon success, with an object containing a list of resources' metadata in the response body.  When reading resources, some common query parameters are usually available. e.g.: ``` v1/connections?limit=25&offset=25 ```  |Query Parameter|Type|Description| |---------------|----|-----------| |limit|integer|Maximum number of objects to fetch. Usually 25 by default| |offset|integer|Offset after which to start returning objects. For use with limit query parameter.|  ### Update  Updating a resource requires the resource `id`, and is typically done using an HTTP `PATCH` request, with the fields to modify in the request body. The response usually returns a `200 OK` response code upon success, with information about the modified resource in the response body.  ### Delete  Deleting a resource requires the resource `id` and is typically executed via an HTTP `DELETE` request. The response usually returns a `204 No Content` response code upon success.  ## Conventions  - Resource names are plural and expressed in camelCase. - Names are consistent between URL parameter name and field name.  - Field names are in snake_case. ```json {     \"description\": \"string\",     \"name\": \"string\",     \"occupied_slots\": 0,     \"open_slots\": 0     \"queued_slots\": 0,     \"running_slots\": 0,     \"scheduled_slots\": 0,     \"slots\": 0, } ```  ### Update Mask  Update mask is available as a query parameter in patch endpoints. It is used to notify the API which fields you want to update. Using `update_mask` makes it easier to update objects by helping the server know which fields to update in an object instead of updating all fields. The update request ignores any fields that aren't specified in the field mask, leaving them with their current values.  Example: ```   resource = request.get('/resource/my-id').json()   resource['my_field'] = 'new-value'   request.patch('/resource/my-id?update_mask=my_field', data=json.dumps(resource)) ```  ## Versioning and Endpoint Lifecycle  - API versioning is not synchronized to specific releases of the Apache Airflow. - APIs are designed to be backward compatible. - Any changes to the API will first go through a deprecation phase.  # Trying the API  You can use a third party client, such as [curl](https://curl.haxx.se/), [HTTPie](https://httpie.org/), [Postman](https://www.postman.com/) or [the Insomnia rest client](https://insomnia.rest/) to test the Apache Airflow API.  Note that you will need to pass credentials data.  For e.g., here is how to pause a DAG with [curl](https://curl.haxx.se/), when basic authorization is used: ```bash curl -X PATCH 'https://example.com/api/v1/dags/{dag_id}?update_mask=is_paused' \\ -H 'Content-Type: application/json' \\ --user \"username:password\" \\ -d '{     \"is_paused\": true }' ```  Using a graphical tool such as [Postman](https://www.postman.com/) or [Insomnia](https://insomnia.rest/), it is possible to import the API specifications directly:  1. Download the API specification by clicking the **Download** button at the top of this document 2. Import the JSON specification in the graphical tool of your choice.   - In *Postman*, you can click the **import** button at the top   - With *Insomnia*, you can just drag-and-drop the file on the UI  Note that with *Postman*, you can also generate code snippets by selecting a request and clicking on the **Code** button.  ## Enabling CORS  [Cross-origin resource sharing (CORS)](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) is a browser security feature that restricts HTTP requests that are initiated from scripts running in the browser.  For details on enabling/configuring CORS, see [Enabling CORS](https://airflow.apache.org/docs/apache-airflow/stable/security/api.html).  # Authentication  To be able to meet the requirements of many organizations, Airflow supports many authentication methods, and it is even possible to add your own method.  If you want to check which auth backend is currently set, you can use `airflow config get-value api auth_backends` command as in the example below. ```bash $ airflow config get-value api auth_backends airflow.api.auth.backend.basic_auth ``` The default is to deny all requests.  For details on configuring the authentication, see [API Authorization](https://airflow.apache.org/docs/apache-airflow/stable/security/api.html).  # Errors  We follow the error response format proposed in [RFC 7807](https://tools.ietf.org/html/rfc7807) also known as Problem Details for HTTP APIs. As with our normal API responses, your client must be prepared to gracefully handle additional members of the response.  ## Unauthenticated  This indicates that the request has not been applied because it lacks valid authentication credentials for the target resource. Please check that you have valid credentials.  ## PermissionDenied  This response means that the server understood the request but refuses to authorize it because it lacks sufficient rights to the resource. It happens when you do not have the necessary permission to execute the action you performed. You need to get the appropriate permissions in other to resolve this error.  ## BadRequest  This response means that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). To resolve this, please ensure that your syntax is correct.  ## NotFound  This client error response indicates that the server cannot find the requested resource.  ## MethodNotAllowed  Indicates that the request method is known by the server but is not supported by the target resource.  ## NotAcceptable  The target resource does not have a current representation that would be acceptable to the user agent, according to the proactive negotiation header fields received in the request, and the server is unwilling to supply a default representation.  ## AlreadyExists  The request could not be completed due to a conflict with the current state of the target resource, e.g. the resource it tries to create already exists.  ## Unknown  This means that the server encountered an unexpected condition that prevented it from fulfilling the request.   # noqa: E501

    The version of the OpenAPI document: 2.8.0
    Contact: dev@airflow.apache.org
    Generated by: https://openapi-generator.tech
"""


import json
import atexit
import mimetypes
from multiprocessing.pool import ThreadPool
import io
import os
import re
import typing
from urllib.parse import quote
from urllib3.fields import RequestField


from airflow_client.client import rest
from airflow_client.client.configuration import Configuration
from airflow_client.client.exceptions import ApiTypeError, ApiValueError, ApiException
from airflow_client.client.model_utils import (
    ModelNormal,
    ModelSimple,
    ModelComposed,
    check_allowed_values,
    check_validations,
    date,
    datetime,
    deserialize_file,
    file_type,
    model_to_dict,
    none_type,
    validate_and_convert_types
)


class ApiClient(object):
    """Generic API client for OpenAPI client library builds.

    OpenAPI generic API client. This client handles the client-
    server communication, and is invariant across implementations. Specifics of
    the methods and models for each application are generated from the OpenAPI
    templates.

    NOTE: This class is auto generated by OpenAPI Generator.
    Ref: https://openapi-generator.tech
    Do not edit the class manually.

    :param configuration: .Configuration object for this client
    :param header_name: a header to pass when making calls to the API.
    :param header_value: a header value to pass when making calls to
        the API.
    :param cookie: a cookie to include in the header when making calls
        to the API
    :param pool_threads: The number of threads to use for async requests
        to the API. More threads means more concurrent API requests.
    """

    _pool = None

    def __init__(self, configuration=None, header_name=None, header_value=None,
                 cookie=None, pool_threads=1):
        if configuration is None:
            configuration = Configuration.get_default_copy()
        self.configuration = configuration
        self.pool_threads = pool_threads

        self.rest_client = rest.RESTClientObject(configuration)
        self.default_headers = {}
        if header_name is not None:
            self.default_headers[header_name] = header_value
        self.cookie = cookie
        # Set default User-Agent.
        self.user_agent = 'OpenAPI-Generator/2.8.0/python'

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        self.close()

    def close(self):
        if self._pool:
            self._pool.close()
            self._pool.join()
            self._pool = None
            if hasattr(atexit, 'unregister'):
                atexit.unregister(self.close)

    @property
    def pool(self):
        """Create thread pool on first request
         avoids instantiating unused threadpool for blocking clients.
        """
        if self._pool is None:
            atexit.register(self.close)
            self._pool = ThreadPool(self.pool_threads)
        return self._pool

    @property
    def user_agent(self):
        """User agent for this API client"""
        return self.default_headers['User-Agent']

    @user_agent.setter
    def user_agent(self, value):
        self.default_headers['User-Agent'] = value

    def set_default_header(self, header_name, header_value):
        self.default_headers[header_name] = header_value

    def __call_api(
        self,
        resource_path: str,
        method: str,
        path_params: typing.Optional[typing.Dict[str, typing.Any]] = None,
        query_params: typing.Optional[typing.List[typing.Tuple[str, typing.Any]]] = None,
        header_params: typing.Optional[typing.Dict[str, typing.Any]] = None,
        body: typing.Optional[typing.Any] = None,
        post_params: typing.Optional[typing.List[typing.Tuple[str, typing.Any]]] = None,
        files: typing.Optional[typing.Dict[str, typing.List[io.IOBase]]] = None,
        response_type: typing.Optional[typing.Tuple[typing.Any]] = None,
        auth_settings: typing.Optional[typing.List[str]] = None,
        _return_http_data_only: typing.Optional[bool] = None,
        collection_formats: typing.Optional[typing.Dict[str, str]] = None,
        _preload_content: bool = True,
        _request_timeout: typing.Optional[typing.Union[int, float, typing.Tuple]] = None,
        _host: typing.Optional[str] = None,
        _check_type: typing.Optional[bool] = None,
        _content_type: typing.Optional[str] = None
    ):

        config = self.configuration

        # header parameters
        header_params = header_params or {}
        header_params.update(self.default_headers)
        if self.cookie:
            header_params['Cookie'] = self.cookie
        if header_params:
            header_params = self.sanitize_for_serialization(header_params)
            header_params = dict(self.parameters_to_tuples(header_params,
                                                           collection_formats))

        # path parameters
        if path_params:
            path_params = self.sanitize_for_serialization(path_params)
            path_params = self.parameters_to_tuples(path_params,
                                                    collection_formats)
            for k, v in path_params:
                # specified safe chars, encode everything
                resource_path = resource_path.replace(
                    '{%s}' % k,
                    quote(str(v), safe=config.safe_chars_for_path_param)
                )

        # query parameters
        if query_params:
            query_params = self.sanitize_for_serialization(query_params)
            query_params = self.parameters_to_tuples(query_params,
                                                     collection_formats)

        # post parameters
        if post_params or files:
            post_params = post_params if post_params else []
            post_params = self.sanitize_for_serialization(post_params)
            post_params = self.parameters_to_tuples(post_params,
                                                    collection_formats)
            post_params.extend(self.files_parameters(files))
            if header_params['Content-Type'].startswith("multipart"):
                post_params = self.parameters_to_multipart(post_params,
                                                          (dict) )

        # body
        if body:
            body = self.sanitize_for_serialization(body)

        # auth setting
        self.update_params_for_auth(header_params, query_params,
                                    auth_settings, resource_path, method, body)

        # request url
        if _host is None:
            url = self.configuration.host + resource_path
        else:
            # use server/host defined in path or operation instead
            url = _host + resource_path

        try:
            # perform request and return response
            response_data = self.request(
                method, url, query_params=query_params, headers=header_params,
                post_params=post_params, body=body,
                _preload_content=_preload_content,
                _request_timeout=_request_timeout)
        except ApiException as e:
            e.body = e.body.decode('utf-8')
            raise e

        self.last_response = response_data

        return_data = response_data

        if not _preload_content:
            return (return_data)
            return return_data

        # deserialize response data
        if response_type:
            if response_type != (file_type,):
                encoding = "utf-8"
                content_type = response_data.getheader('content-type')
                if content_type is not None:
                    match = re.search(r"charset=([a-zA-Z\-\d]+)[\s\;]?", content_type)
                    if match:
                        encoding = match.group(1)
                response_data.data = response_data.data.decode(encoding)

            return_data = self.deserialize(
                response_data,
                response_type,
                _check_type
            )
        else:
            return_data = None

        if _return_http_data_only:
            return (return_data)
        else:
            return (return_data, response_data.status,
                    response_data.getheaders())

    def parameters_to_multipart(self, params, collection_types):
        """Get parameters as list of tuples, formatting as json if value is collection_types

        :param params: Parameters as list of two-tuples
        :param dict collection_types: Parameter collection types
        :return: Parameters as list of tuple or urllib3.fields.RequestField
        """
        new_params = []
        if collection_types is None:
            collection_types = (dict)
        for k, v in params.items() if isinstance(params, dict) else params:  # noqa: E501
            if isinstance(v, collection_types): # v is instance of collection_type, formatting as application/json
                 v = json.dumps(v, ensure_ascii=False).encode("utf-8")
                 field = RequestField(k, v)
                 field.make_multipart(content_type="application/json; charset=utf-8")
                 new_params.append(field)
            else:
                 new_params.append((k, v))
        return new_params

    @classmethod
    def sanitize_for_serialization(cls, obj):
        """Prepares data for transmission before it is sent with the rest client
        If obj is None, return None.
        If obj is str, int, long, float, bool, return directly.
        If obj is datetime.datetime, datetime.date
            convert to string in iso8601 format.
        If obj is list, sanitize each element in the list.
        If obj is dict, return the dict.
        If obj is OpenAPI model, return the properties dict.
        If obj is io.IOBase, return the bytes
        :param obj: The data to serialize.
        :return: The serialized form of data.
        """
        if isinstance(obj, (ModelNormal, ModelComposed)):
            return {
                key: cls.sanitize_for_serialization(val) for key, val in model_to_dict(obj, serialize=True).items()
            }
        elif isinstance(obj, io.IOBase):
            return cls.get_file_data_and_close_file(obj)
        elif isinstance(obj, (str, int, float, none_type, bool)):
            return obj
        elif isinstance(obj, (datetime, date)):
            return obj.isoformat()
        elif isinstance(obj, ModelSimple):
            return cls.sanitize_for_serialization(obj.value)
        elif isinstance(obj, (list, tuple)):
            return [cls.sanitize_for_serialization(item) for item in obj]
        if isinstance(obj, dict):
            return {key: cls.sanitize_for_serialization(val) for key, val in obj.items()}
        raise ApiValueError('Unable to prepare type {} for serialization'.format(obj.__class__.__name__))

    def deserialize(self, response, response_type, _check_type):
        """Deserializes response into an object.

        :param response: RESTResponse object to be deserialized.
        :param response_type: For the response, a tuple containing:
            valid classes
            a list containing valid classes (for list schemas)
            a dict containing a tuple of valid classes as the value
            Example values:
            (str,)
            (Pet,)
            (float, none_type)
            ([int, none_type],)
            ({str: (bool, str, int, float, date, datetime, str, none_type)},)
        :param _check_type: boolean, whether to check the types of the data
            received from the server
        :type _check_type: bool

        :return: deserialized object.
        """
        # handle file downloading
        # save response body into a tmp file and return the instance
        if response_type == (file_type,):
            content_disposition = response.getheader("Content-Disposition")
            return deserialize_file(response.data, self.configuration,
                                    content_disposition=content_disposition)

        # fetch data from response object
        try:
            received_data = json.loads(response.data)
        except ValueError:
            received_data = response.data

        # store our data under the key of 'received_data' so users have some
        # context if they are deserializing a string and the data type is wrong
        deserialized_data = validate_and_convert_types(
            received_data,
            response_type,
            ['received_data'],
            True,
            _check_type,
            configuration=self.configuration
        )
        return deserialized_data

    def call_api(
        self,
        resource_path: str,
        method: str,
        path_params: typing.Optional[typing.Dict[str, typing.Any]] = None,
        query_params: typing.Optional[typing.List[typing.Tuple[str, typing.Any]]] = None,
        header_params: typing.Optional[typing.Dict[str, typing.Any]] = None,
        body: typing.Optional[typing.Any] = None,
        post_params: typing.Optional[typing.List[typing.Tuple[str, typing.Any]]] = None,
        files: typing.Optional[typing.Dict[str, typing.List[io.IOBase]]] = None,
        response_type: typing.Optional[typing.Tuple[typing.Any]] = None,
        auth_settings: typing.Optional[typing.List[str]] = None,
        async_req: typing.Optional[bool] = None,
        _return_http_data_only: typing.Optional[bool] = None,
        collection_formats: typing.Optional[typing.Dict[str, str]] = None,
        _preload_content: bool = True,
        _request_timeout: typing.Optional[typing.Union[int, float, typing.Tuple]] = None,
        _host: typing.Optional[str] = None,
        _check_type: typing.Optional[bool] = None
    ):
        """Makes the HTTP request (synchronous) and returns deserialized data.

        To make an async_req request, set the async_req parameter.

        :param resource_path: Path to method endpoint.
        :param method: Method to call.
        :param path_params: Path parameters in the url.
        :param query_params: Query parameters in the url.
        :param header_params: Header parameters to be
            placed in the request header.
        :param body: Request body.
        :param post_params dict: Request post form parameters,
            for `application/x-www-form-urlencoded`, `multipart/form-data`.
        :param auth_settings list: Auth Settings names for the request.
        :param response_type: For the response, a tuple containing:
            valid classes
            a list containing valid classes (for list schemas)
            a dict containing a tuple of valid classes as the value
            Example values:
            (str,)
            (Pet,)
            (float, none_type)
            ([int, none_type],)
            ({str: (bool, str, int, float, date, datetime, str, none_type)},)
        :param files: key -> field name, value -> a list of open file
            objects for `multipart/form-data`.
        :type files: dict
        :param async_req bool: execute request asynchronously
        :type async_req: bool, optional
        :param _return_http_data_only: response data without head status code
                                       and headers
        :type _return_http_data_only: bool, optional
        :param collection_formats: dict of collection formats for path, query,
            header, and post parameters.
        :type collection_formats: dict, optional
        :param _preload_content: if False, the urllib3.HTTPResponse object will
                                 be returned without reading/decoding response
                                 data. Default is True.
        :type _preload_content: bool, optional
        :param _request_timeout: timeout setting for this request. If one
                                 number provided, it will be total request
                                 timeout. It can also be a pair (tuple) of
                                 (connection, read) timeouts.
        :param _check_type: boolean describing if the data back from the server
            should have its type checked.
        :type _check_type: bool, optional
        :return:
            If async_req parameter is True,
            the request will be called asynchronously.
            The method will return the request thread.
            If parameter async_req is False or missing,
            then the method will return the response directly.
        """
        if not async_req:
            return self.__call_api(resource_path, method,
                                   path_params, query_params, header_params,
                                   body, post_params, files,
                                   response_type, auth_settings,
                                   _return_http_data_only, collection_formats,
                                   _preload_content, _request_timeout, _host,
                                   _check_type)

        return self.pool.apply_async(self.__call_api, (resource_path,
                                                       method, path_params,
                                                       query_params,
                                                       header_params, body,
                                                       post_params, files,
                                                       response_type,
                                                       auth_settings,
                                                       _return_http_data_only,
                                                       collection_formats,
                                                       _preload_content,
                                                       _request_timeout,
                                                       _host, _check_type))

    def request(self, method, url, query_params=None, headers=None,
                post_params=None, body=None, _preload_content=True,
                _request_timeout=None):
        """Makes the HTTP request using RESTClient."""
        if method == "GET":
            return self.rest_client.GET(url,
                                        query_params=query_params,
                                        _preload_content=_preload_content,
                                        _request_timeout=_request_timeout,
                                        headers=headers)
        elif method == "HEAD":
            return self.rest_client.HEAD(url,
                                         query_params=query_params,
                                         _preload_content=_preload_content,
                                         _request_timeout=_request_timeout,
                                         headers=headers)
        elif method == "OPTIONS":
            return self.rest_client.OPTIONS(url,
                                            query_params=query_params,
                                            headers=headers,
                                            post_params=post_params,
                                            _preload_content=_preload_content,
                                            _request_timeout=_request_timeout,
                                            body=body)
        elif method == "POST":
            return self.rest_client.POST(url,
                                         query_params=query_params,
                                         headers=headers,
                                         post_params=post_params,
                                         _preload_content=_preload_content,
                                         _request_timeout=_request_timeout,
                                         body=body)
        elif method == "PUT":
            return self.rest_client.PUT(url,
                                        query_params=query_params,
                                        headers=headers,
                                        post_params=post_params,
                                        _preload_content=_preload_content,
                                        _request_timeout=_request_timeout,
                                        body=body)
        elif method == "PATCH":
            return self.rest_client.PATCH(url,
                                          query_params=query_params,
                                          headers=headers,
                                          post_params=post_params,
                                          _preload_content=_preload_content,
                                          _request_timeout=_request_timeout,
                                          body=body)
        elif method == "DELETE":
            return self.rest_client.DELETE(url,
                                           query_params=query_params,
                                           headers=headers,
                                           _preload_content=_preload_content,
                                           _request_timeout=_request_timeout,
                                           body=body)
        else:
            raise ApiValueError(
                "http method must be `GET`, `HEAD`, `OPTIONS`,"
                " `POST`, `PATCH`, `PUT` or `DELETE`."
            )

    def parameters_to_tuples(self, params, collection_formats):
        """Get parameters as list of tuples, formatting collections.

        :param params: Parameters as dict or list of two-tuples
        :param dict collection_formats: Parameter collection formats
        :return: Parameters as list of tuples, collections formatted
        """
        new_params = []
        if collection_formats is None:
            collection_formats = {}
        for k, v in params.items() if isinstance(params, dict) else params:  # noqa: E501
            if k in collection_formats:
                collection_format = collection_formats[k]
                if collection_format == 'multi':
                    new_params.extend((k, value) for value in v)
                else:
                    if collection_format == 'ssv':
                        delimiter = ' '
                    elif collection_format == 'tsv':
                        delimiter = '\t'
                    elif collection_format == 'pipes':
                        delimiter = '|'
                    else:  # csv is the default
                        delimiter = ','
                    new_params.append(
                        (k, delimiter.join(str(value) for value in v)))
            else:
                new_params.append((k, v))
        return new_params

    @staticmethod
    def get_file_data_and_close_file(file_instance: io.IOBase) -> bytes:
        file_data = file_instance.read()
        file_instance.close()
        return file_data

    def files_parameters(self, files: typing.Optional[typing.Dict[str, typing.List[io.IOBase]]] = None):
        """Builds form parameters.

        :param files: None or a dict with key=param_name and
            value is a list of open file objects
        :return: List of tuples of form parameters with file data
        """
        if files is None:
            return []

        params = []
        for param_name, file_instances in files.items():
            if file_instances is None:
                # if the file field is nullable, skip None values
                continue
            for file_instance in file_instances:
                if file_instance is None:
                    # if the file field is nullable, skip None values
                    continue
                if file_instance.closed is True:
                    raise ApiValueError(
                        "Cannot read a closed file. The passed in file_type "
                        "for %s must be open." % param_name
                    )
                filename = os.path.basename(file_instance.name)
                filedata = self.get_file_data_and_close_file(file_instance)
                mimetype = (mimetypes.guess_type(filename)[0] or
                            'application/octet-stream')
                params.append(
                    tuple([param_name, tuple([filename, filedata, mimetype])]))

        return params

    def select_header_accept(self, accepts):
        """Returns `Accept` based on an array of accepts provided.

        :param accepts: List of headers.
        :return: Accept (e.g. application/json).
        """
        if not accepts:
            return

        accepts = [x.lower() for x in accepts]

        if 'application/json' in accepts:
            return 'application/json'
        else:
            return ', '.join(accepts)

    def select_header_content_type(self, content_types, method=None, body=None):
        """Returns `Content-Type` based on an array of content_types provided.

        :param content_types: List of content-types.
        :param method: http method (e.g. POST, PATCH).
        :param body: http body to send.
        :return: Content-Type (e.g. application/json).
        """
        if not content_types:
            return 'application/json'

        content_types = [x.lower() for x in content_types]

        if (method == 'PATCH' and
                'application/json-patch+json' in content_types and
                isinstance(body, list)):
            return 'application/json-patch+json'

        if 'application/json' in content_types or '*/*' in content_types:
            return 'application/json'
        else:
            return content_types[0]

    def update_params_for_auth(self, headers, queries, auth_settings,
                               resource_path, method, body):
        """Updates header and query params based on authentication setting.

        :param headers: Header parameters dict to be updated.
        :param queries: Query parameters tuple list to be updated.
        :param auth_settings: Authentication setting identifiers list.
        :param resource_path: A string representation of the HTTP request resource path.
        :param method: A string representation of the HTTP request method.
        :param body: A object representing the body of the HTTP request.
            The object type is the return value of _encoder.default().
        """
        if not auth_settings:
            return

        for auth in auth_settings:
            auth_setting = self.configuration.auth_settings().get(auth)
            if auth_setting:
                if auth_setting['in'] == 'cookie':
                    headers['Cookie'] = auth_setting['value']
                elif auth_setting['in'] == 'header':
                    if auth_setting['type'] != 'http-signature':
                        headers[auth_setting['key']] = auth_setting['value']
                elif auth_setting['in'] == 'query':
                    queries.append((auth_setting['key'], auth_setting['value']))
                else:
                    raise ApiValueError(
                        'Authentication token must be in `query` or `header`'
                    )


class Endpoint(object):
    def __init__(self, settings=None, params_map=None, root_map=None,
                 headers_map=None, api_client=None, callable=None):
        """Creates an endpoint

        Args:
            settings (dict): see below key value pairs
                'response_type' (tuple/None): response type
                'auth' (list): a list of auth type keys
                'endpoint_path' (str): the endpoint path
                'operation_id' (str): endpoint string identifier
                'http_method' (str): POST/PUT/PATCH/GET etc
                'servers' (list): list of str servers that this endpoint is at
            params_map (dict): see below key value pairs
                'all' (list): list of str endpoint parameter names
                'required' (list): list of required parameter names
                'nullable' (list): list of nullable parameter names
                'enum' (list): list of parameters with enum values
                'validation' (list): list of parameters with validations
            root_map
                'validations' (dict): the dict mapping endpoint parameter tuple
                    paths to their validation dictionaries
                'allowed_values' (dict): the dict mapping endpoint parameter
                    tuple paths to their allowed_values (enum) dictionaries
                'openapi_types' (dict): param_name to openapi type
                'attribute_map' (dict): param_name to camelCase name
                'location_map' (dict): param_name to  'body', 'file', 'form',
                    'header', 'path', 'query'
                collection_format_map (dict): param_name to `csv` etc.
            headers_map (dict): see below key value pairs
                'accept' (list): list of Accept header strings
                'content_type' (list): list of Content-Type header strings
            api_client (ApiClient) api client instance
            callable (function): the function which is invoked when the
                Endpoint is called
        """
        self.settings = settings
        self.params_map = params_map
        self.params_map['all'].extend([
            'async_req',
            '_host_index',
            '_preload_content',
            '_request_timeout',
            '_return_http_data_only',
            '_check_input_type',
            '_check_return_type',
            '_content_type',
            '_spec_property_naming'
        ])
        self.params_map['nullable'].extend(['_request_timeout'])
        self.validations = root_map['validations']
        self.allowed_values = root_map['allowed_values']
        self.openapi_types = root_map['openapi_types']
        extra_types = {
            'async_req': (bool,),
            '_host_index': (none_type, int),
            '_preload_content': (bool,),
            '_request_timeout': (none_type, float, (float,), [float], int, (int,), [int]),
            '_return_http_data_only': (bool,),
            '_check_input_type': (bool,),
            '_check_return_type': (bool,),
            '_spec_property_naming': (bool,),
            '_content_type': (none_type, str)
        }
        self.openapi_types.update(extra_types)
        self.attribute_map = root_map['attribute_map']
        self.location_map = root_map['location_map']
        self.collection_format_map = root_map['collection_format_map']
        self.headers_map = headers_map
        self.api_client = api_client
        self.callable = callable

    def __validate_inputs(self, kwargs):
        for param in self.params_map['enum']:
            if param in kwargs:
                check_allowed_values(
                    self.allowed_values,
                    (param,),
                    kwargs[param]
                )

        for param in self.params_map['validation']:
            if param in kwargs:
                check_validations(
                    self.validations,
                    (param,),
                    kwargs[param],
                    configuration=self.api_client.configuration
                )

        if kwargs['_check_input_type'] is False:
            return

        for key, value in kwargs.items():
            fixed_val = validate_and_convert_types(
                value,
                self.openapi_types[key],
                [key],
                kwargs['_spec_property_naming'],
                kwargs['_check_input_type'],
                configuration=self.api_client.configuration
            )
            kwargs[key] = fixed_val

    def __gather_params(self, kwargs):
        params = {
            'body': None,
            'collection_format': {},
            'file': {},
            'form': [],
            'header': {},
            'path': {},
            'query': []
        }

        for param_name, param_value in kwargs.items():
            param_location = self.location_map.get(param_name)
            if param_location is None:
                continue
            if param_location:
                if param_location == 'body':
                    params['body'] = param_value
                    continue
                base_name = self.attribute_map[param_name]
                if (param_location == 'form' and
                        self.openapi_types[param_name] == (file_type,)):
                    params['file'][base_name] = [param_value]
                elif (param_location == 'form' and
                        self.openapi_types[param_name] == ([file_type],)):
                    # param_value is already a list
                    params['file'][base_name] = param_value
                elif param_location in {'form', 'query'}:
                    param_value_full = (base_name, param_value)
                    params[param_location].append(param_value_full)
                if param_location not in {'form', 'query'}:
                    params[param_location][base_name] = param_value
                collection_format = self.collection_format_map.get(param_name)
                if collection_format:
                    params['collection_format'][base_name] = collection_format

        return params

    def __call__(self, *args, **kwargs):
        """ This method is invoked when endpoints are called
        Example:

        api_instance = ConfigApi()
        api_instance.get_config  # this is an instance of the class Endpoint
        api_instance.get_config()  # this invokes api_instance.get_config.__call__()
        which then invokes the callable functions stored in that endpoint at
        api_instance.get_config.callable or self.callable in this class

        """
        return self.callable(self, *args, **kwargs)

    def call_with_http_info(self, **kwargs):

        try:
            index = self.api_client.configuration.server_operation_index.get(
                self.settings['operation_id'], self.api_client.configuration.server_index
            ) if kwargs['_host_index'] is None else kwargs['_host_index']
            server_variables = self.api_client.configuration.server_operation_variables.get(
                self.settings['operation_id'], self.api_client.configuration.server_variables
            )
            _host = self.api_client.configuration.get_host_from_settings(
                index, variables=server_variables, servers=self.settings['servers']
            )
        except IndexError:
            if self.settings['servers']:
                raise ApiValueError(
                    "Invalid host index. Must be 0 <= index < %s" %
                    len(self.settings['servers'])
                )
            _host = None

        for key, value in kwargs.items():
            if key not in self.params_map['all']:
                raise ApiTypeError(
                    "Got an unexpected parameter '%s'"
                    " to method `%s`" %
                    (key, self.settings['operation_id'])
                )
            # only throw this nullable ApiValueError if _check_input_type
            # is False, if _check_input_type==True we catch this case
            # in self.__validate_inputs
            if (key not in self.params_map['nullable'] and value is None
                    and kwargs['_check_input_type'] is False):
                raise ApiValueError(
                    "Value may not be None for non-nullable parameter `%s`"
                    " when calling `%s`" %
                    (key, self.settings['operation_id'])
                )

        for key in self.params_map['required']:
            if key not in kwargs.keys():
                raise ApiValueError(
                    "Missing the required parameter `%s` when calling "
                    "`%s`" % (key, self.settings['operation_id'])
                )

        self.__validate_inputs(kwargs)

        params = self.__gather_params(kwargs)

        accept_headers_list = self.headers_map['accept']
        if accept_headers_list:
            params['header']['Accept'] = self.api_client.select_header_accept(
                accept_headers_list)

        if kwargs.get('_content_type'):
            params['header']['Content-Type'] = kwargs['_content_type']
        else:
            content_type_headers_list = self.headers_map['content_type']
            if content_type_headers_list:
                if params['body'] != "":
                    header_list = self.api_client.select_header_content_type(
                        content_type_headers_list, self.settings['http_method'],
                        params['body'])
                    params['header']['Content-Type'] = header_list

        return self.api_client.call_api(
            self.settings['endpoint_path'], self.settings['http_method'],
            params['path'],
            params['query'],
            params['header'],
            body=params['body'],
            post_params=params['form'],
            files=params['file'],
            response_type=self.settings['response_type'],
            auth_settings=self.settings['auth'],
            async_req=kwargs['async_req'],
            _check_type=kwargs['_check_return_type'],
            _return_http_data_only=kwargs['_return_http_data_only'],
            _preload_content=kwargs['_preload_content'],
            _request_timeout=kwargs['_request_timeout'],
            _host=_host,
            collection_formats=params['collection_format'])