# coding: utf-8

"""
    NetHSM
    All endpoints expect exactly the specified JSON. Additional properties will cause a Bad Request Error (400). All HTTP errors contain a JSON structure with an explanation of type string. All [base64](https://tools.ietf.org/html/rfc4648#section-4) encoded values are Big Endian.   # noqa: E501
    The version of the OpenAPI document: v1
    Generated by: https://github.com/openapi-json-schema-tools/openapi-json-schema-generator
"""

import logging
import ssl
from urllib.parse import urlencode
import typing

import certifi  # type: ignore[import]
import urllib3
from urllib3 import fields
from urllib3 import exceptions as urllib3_exceptions
from urllib3._collections import HTTPHeaderDict

from nethsm.client import exceptions


logger = logging.getLogger(__name__)
_TYPE_FIELD_VALUE = typing.Union[str, bytes]


class RequestField(fields.RequestField):
    def __init__(
        self,
        name: str,
        data: _TYPE_FIELD_VALUE,
        filename: typing.Optional[str] = None,
        headers: typing.Optional[typing.Mapping[str, typing.Union[str, None]]] = None,
        header_formatter: typing.Optional[typing.Callable[[str, _TYPE_FIELD_VALUE], str]] = None,
    ):
        super().__init__(name, data, filename, headers, header_formatter) # type: ignore

    def __eq__(self, other):
        if not isinstance(other, fields.RequestField):
            return False
        return self.__dict__ == other.__dict__


class RESTClientObject(object):

    def __init__(self, configuration, pools_size=4, maxsize=None):
        # urllib3.PoolManager will pass all kw parameters to connectionpool
        # https://github.com/shazow/urllib3/blob/f9409436f83aeb79fbaf090181cd81b784f1b8ce/urllib3/poolmanager.py#L75  # noqa: E501
        # https://github.com/shazow/urllib3/blob/f9409436f83aeb79fbaf090181cd81b784f1b8ce/urllib3/connectionpool.py#L680  # noqa: E501
        # maxsize is the number of requests to host that are allowed in parallel  # noqa: E501
        # Custom SSL certificates and client certificates: http://urllib3.readthedocs.io/en/latest/advanced-usage.html  # noqa: E501

        # cert_reqs
        if configuration.verify_ssl:
            cert_reqs = ssl.CERT_REQUIRED
        else:
            cert_reqs = ssl.CERT_NONE

        # ca_certs
        if configuration.ssl_ca_cert:
            ca_certs = configuration.ssl_ca_cert
        else:
            # if not set certificate file, use Mozilla's root certificates.
            ca_certs = certifi.where()

        addition_pool_args = {}
        if configuration.assert_hostname is not None:
            addition_pool_args['assert_hostname'] = configuration.assert_hostname  # noqa: E501

        if configuration.retries is not None:
            addition_pool_args['retries'] = configuration.retries

        if configuration.socket_options is not None:
            addition_pool_args['socket_options'] = configuration.socket_options

        if maxsize is None:
            if configuration.connection_pool_maxsize is not None:
                maxsize = configuration.connection_pool_maxsize
            else:
                maxsize = 4

        # https pool manager
        if configuration.proxy:
            self.pool_manager = urllib3.ProxyManager(
                num_pools=pools_size,
                maxsize=maxsize,
                cert_reqs=cert_reqs,
                ca_certs=ca_certs,
                cert_file=configuration.cert_file,
                key_file=configuration.key_file,
                proxy_url=configuration.proxy,
                proxy_headers=configuration.proxy_headers,
                **addition_pool_args
            )
        else:
            self.pool_manager = urllib3.PoolManager(
                num_pools=pools_size,
                maxsize=maxsize,
                cert_reqs=cert_reqs,
                ca_certs=ca_certs,
                cert_file=configuration.cert_file,
                key_file=configuration.key_file,
                **addition_pool_args
            )

    def request(
        self,
        method: str,
        url: str,
        headers: typing.Optional[HTTPHeaderDict] = None,
        fields: typing.Optional[typing.Tuple[RequestField, ...]] = None,
        body: typing.Optional[typing.Union[str, bytes]] = None,
        stream: bool = False,
        timeout: typing.Optional[typing.Union[int, float, typing.Tuple]] = None,
    ) -> urllib3.HTTPResponse:
        """Perform requests.

        :param method: http request method
        :param url: http request url
        :param headers: http request headers
        :param body: request body, for other types
        :param fields: request parameters for
                                `application/x-www-form-urlencoded`
                                or `multipart/form-data`
        :param stream: if True, the urllib3.HTTPResponse object will
                                be returned without reading/decoding response
                                data. Default is False.
        :param 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.
        """
        assert method in ['GET', 'HEAD', 'DELETE', 'POST', 'PUT',
                          'PATCH', 'OPTIONS']

        if fields and body:
            raise exceptions.ApiValueError(
                "body parameter cannot be used with fields parameter."
            )

        headers = headers or HTTPHeaderDict()

        used_timeout: typing.Optional[urllib3.Timeout] = None
        if timeout:
            if isinstance(timeout, (int, float)):
                used_timeout = urllib3.Timeout(total=timeout)
            elif (isinstance(timeout, tuple) and
                  len(timeout) == 2):
                used_timeout = urllib3.Timeout(connect=timeout[0], read=timeout[1])

        try:
            # For `POST`, `PUT`, `PATCH`, `OPTIONS`, `DELETE`
            if method in {'POST', 'PUT', 'PATCH', 'OPTIONS', 'DELETE'}:
                if 'Content-Type' not in headers and body is None:
                    r = self.pool_manager.request(
                        method,
                        url,
                        preload_content=not stream,
                        timeout=used_timeout,
                        headers=headers
                    )
                elif headers['Content-Type'] == 'application/x-www-form-urlencoded':  # noqa: E501
                    r = self.pool_manager.request(
                        method, url,
                        body=body,
                        encode_multipart=False,
                        preload_content=not stream,
                        timeout=used_timeout,
                        headers=headers)
                elif headers['Content-Type'] == 'multipart/form-data':
                    # must del headers['Content-Type'], or the correct
                    # Content-Type which generated by urllib3 will be
                    # overwritten.
                    del headers['Content-Type']
                    r = self.pool_manager.request(
                        method, url,
                        fields=fields,
                        encode_multipart=True,
                        preload_content=not stream,
                        timeout=used_timeout,
                        headers=headers)
                # Pass a `string` parameter directly in the body to support
                # other content types than Json when `body` argument is
                # provided in serialized form
                elif isinstance(body, str) or isinstance(body, bytes):
                    request_body = body
                    r = self.pool_manager.request(
                        method, url,
                        body=request_body,
                        preload_content=not stream,
                        timeout=used_timeout,
                        headers=headers)
                else:
                    # Cannot generate the request from given parameters
                    msg = """Cannot prepare a request message for provided
                             arguments. Please check that your arguments match
                             declared content type."""
                    raise exceptions.ApiException(status=0, reason=msg)
            # For `GET`, `HEAD`
            else:
                r = self.pool_manager.request(method, url,
                                              preload_content=not stream,
                                              timeout=used_timeout,
                                              headers=headers)
        except urllib3_exceptions.SSLError as e:
            msg = "{0}\n{1}".format(type(e).__name__, str(e))
            raise exceptions.ApiException(status=0, reason=msg)

        if not stream:
            # log response body
            logger.debug("response body: %s", r.data)

        return r

    def get(self, url, headers=None, stream=False,
            timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("GET", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            fields=fields)

    def head(self, url, headers=None, stream=False,
             timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("HEAD", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            fields=fields)

    def options(self, url, headers=None,
                body=None, stream=False, timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("OPTIONS", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            body=body, fields=fields)

    def delete(self, url, headers=None, body=None,
               stream=False, timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("DELETE", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            body=body, fields=fields)

    def post(self, url, headers=None,
             body=None, stream=False, timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("POST", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            body=body, fields=fields)

    def put(self, url, headers=None,
            body=None, stream=False, timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("PUT", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            body=body, fields=fields)

    def patch(self, url, headers=None,
              body=None, stream=False, timeout=None, fields=None) -> urllib3.HTTPResponse:
        return self.request("PATCH", url,
                            headers=headers,
                            stream=stream,
                            timeout=timeout,
                            body=body, fields=fields)
