#!/usr/bin/env python

r"""
Using python based redfish library.
Refer: https://github.com/DMTF/python-redfish-library
"""

import redfish
import json


class HTTPSBadRequestError(Exception):
    r"""
    BMC redfish generic raised method for error(s).
    """
    pass


class bmc_redfish(object):

    ROBOT_LIBRARY_SCOPE = "GLOBAL"

    def __init__(self, hostname, username, password, *args, **kwargs):
        r"""
        Establish session connection to host.

        Description of argument(s):
        hostname       The host name or IP address of the server.
        username       The username to be used to connect to the server.
        password       The password to be used to connect to the server.
        args/kwargs    Additional parms which are passed directly
                       to the redfish_client function.
        """

        self._base_url_ = "https://" + hostname
        self._username_ = username
        self._password_ = password
        self._default_prefix_ = "/redfish/v1"
        self._robj_ = \
            redfish.redfish_client(base_url=self._base_url_,
                                   username=self._username_,
                                   password=self._password_,
                                   default_prefix=self._default_prefix_,
                                   *args, **kwargs)
        self._robj_.login(auth=redfish.AuthMethod.SESSION)
        self._session_location_ = self._robj_.get_session_location()

    def __enter__(self):
        return self

    def __exit__(self, exception_type, exception_value, traceback):
        self._robj_.logout()

    def login(self, *args, **kwargs):
        r"""
        Call the corresponding RestClientBase method and return the result.

        Description of argument(s):
        args/kwargs     These are passed directly to the corresponding
                        RestClientBase method.
        """
        self._robj_.__init__(self._base_url_, self._username_, self._password_)
        self._robj_.login(auth=redfish.AuthMethod.SESSION)

    def get(self, resource_path, *args, **kwargs):
        r"""
        Perform a GET request and return response.

        Description of argument(s):
        resource_path    URI resource relative path (e.g. "Systems/1").
        args/kwargs      These are passed directly to the corresponding
                         RestClientBase method.
        """
        self._rest_response_ = self._robj_.get('/redfish/v1/' + resource_path,
                                               *args, **kwargs)
        if self._rest_response_.status != 200:
            raise HTTPSBadRequestError("GET Session location: %s, "
                                       "return code: %d"
                                       % (self._session_location_,
                                          self._rest_response_.status))
        return self._rest_response_

    def post(self, resource_path, *args, **kwargs):
        r"""
        Perform a POST request.

        Description of argument(s):
        resource_path    URI resource relative path
                         (e.g. "Systems/1/Actions/ComputerSystem.Reset").
        args/kwargs      These are passed directly to the corresponding
                         RestClientBase method.
        """
        self._rest_response_ = self._robj_.post('/redfish/v1/' + resource_path,
                                                *args, **kwargs)
        if self._rest_response_.status != 200:
            raise HTTPSBadRequestError("POST Session location: %s, "
                                       "return code: %d"
                                       % (self._session_location_,
                                          self._rest_response_.status))
        return self._rest_response_

    def patch(self, resource_path, *args, **kwargs):
        r"""
        Perform a POST request.

        Description of argument(s):
        resource_path    URI resource relative path
        args/kwargs      These are passed directly to the corresponding
                         RestClientBase method.
        """
        self._rest_response_ = self._robj_.patch('/redfish/v1/' + resource_path,
                                                 *args, **kwargs)
        if self._rest_response_.status != 200:
            raise HTTPSBadRequestError("PATCH Session location: %s, "
                                       "return code: %d"
                                       % (self._session_location_,
                                          self._rest_response_.status))
        return self._rest_response_

    def put(self, resource_path, actions, attr_data):
        r"""
        Perform a PUT request.

        Description of argument(s):
        resource_path    URI resource relative path.
        args/kwargs      These are passed directly to the corresponding
                         RestClientBase method.
        """
        self._rest_response_ = self._robj_.put('/redfish/v1/' + resource_path,
                                               *args, **kwargs)
        if self._rest_response_.status != 200:
            raise HTTPSBadRequestError("PUT Session location: %s, "
                                       "return code: %d"
                                       % (self._session_location_,
                                          self._rest_response_.status))
        return self._rest_response_

    def delete(self, resource_path):
        r"""
        Perform a DELETE request.

        Description of argument(s):
        resource_path  URI resource absoulute path
                       (e.g. "/redfish/v1/SessionService/Sessions/8d1a9wiiNL").
        """
        self._rest_response_ = self._robj_.delete(resource_path)
        if self._rest_response_.status != 200:
            raise HTTPSBadRequestError("Session location: %s, "
                                       "return code: %d"
                                       % (self._session_location_,
                                          self._rest_response_.status))
        return self._rest_response_

    def logout(self):
        r"""
        Logout redfish connection session.
        """
        self._robj_.logout()

    def list_request(self, resource_path):
        r"""
        Perform a GET list request and return available resource paths.

        Description of argument(s):
        resource_path    URI resource relative path (e.g. "Systems/1").
        """

        self._rest_response_ = self._robj_.get('/redfish/v1/' + resource_path)

        global resource_list
        resource_list = []
        self.walk_nested_dict(self._rest_response_.dict)

        if not resource_list:
            return uri_path

        for resource in resource_list:
            self._rest_response_ = self._robj_.get(resource)
            if self._rest_response_.status != 200:
                continue
            self.walk_nested_dict(self._rest_response_.dict)

        resource_list.sort()
        return json.dumps(resource_list, sort_keys=True,
                          indent=4, separators=(',', ': '))

    def enumerate_request(self, resource_path):
        r"""
        Perform a GET enumerate request and return available resource paths.

        Description of argument(s):
        resource_path    URI resource relative path (e.g. "Systems/1").
        """

        self._rest_response_ = self.list_request(resource_path)

        resource_dict = {}
        for resource in json.loads(self._rest_response_):
            self._rest_response_ = self._robj_.get(resource)
            if self._rest_response_.status != 200:
                continue
            resource_dict[resource] = self._rest_response_.dict

        return json.dumps(resource_dict, sort_keys=True,
                          indent=4, separators=(',', ': '))

    def walk_nested_dict(self, data):
        r"""
        Parse through the nested dictionary and get the resource id paths.

        Description of argument(s):
        data    Nested dictionary data from response message.
        """

        for key, value in data.items():
            if isinstance(value, dict):
                self.walk_nested_dict(value)
            else:
                if 'Members' == key:
                    if isinstance(value, list):
                        for index in value:
                            if index['@odata.id'] not in resource_list:
                                resource_list.append(index['@odata.id'])
                if '@odata.id' == key:
                    if value not in resource_list and not value.endswith('/'):
                        resource_list.append(value)