# encoding: utf-8
# Code generated by Microsoft (R) AutoRest Code Generator 0.16.0.0
# Changes may cause incorrect behavior and will be lost if the code is
# regenerated.

module Azure::ARM::Compute
  #
  # The Compute Management Client.
  #
  class VirtualMachineScaleSetVMs
    include Azure::ARM::Compute::Models
    include MsRestAzure

    #
    # Creates and initializes a new instance of the VirtualMachineScaleSetVMs class.
    # @param client service class for accessing basic functionality.
    #
    def initialize(client)
      @client = client
    end

    # @return reference to the ComputeManagementClient
    attr_reader :client

    #
    # The operation to re-image a virtual machine scale set instance.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @return [Concurrent::Promise] promise which provides async access to http
    # response.
    #
    def reimage(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      # Send request
      promise = begin_reimage(resource_group_name, vm_scale_set_name, instance_id, custom_headers)

      promise = promise.then do |response|
        # Defining deserialization method.
        deserialize_method = lambda do |parsed_response|
        end

       # Waiting for response.
       @client.get_post_or_delete_operation_result(response, deserialize_method)
      end

      promise
    end

    #
    # The operation to re-image a virtual machine scale set instance.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def begin_reimage(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}/reimage'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :post, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 202
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?

        result
      end

      promise.execute
    end

    #
    # The operation to deallocate a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @return [Concurrent::Promise] promise which provides async access to http
    # response.
    #
    def deallocate(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      # Send request
      promise = begin_deallocate(resource_group_name, vm_scale_set_name, instance_id, custom_headers)

      promise = promise.then do |response|
        # Defining deserialization method.
        deserialize_method = lambda do |parsed_response|
        end

       # Waiting for response.
       @client.get_post_or_delete_operation_result(response, deserialize_method)
      end

      promise
    end

    #
    # The operation to deallocate a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def begin_deallocate(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}/deallocate'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :post, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 202
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?

        result
      end

      promise.execute
    end

    #
    # The operation to delete a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @return [Concurrent::Promise] promise which provides async access to http
    # response.
    #
    def delete(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      # Send request
      promise = begin_delete(resource_group_name, vm_scale_set_name, instance_id, custom_headers)

      promise = promise.then do |response|
        # Defining deserialization method.
        deserialize_method = lambda do |parsed_response|
        end

       # Waiting for response.
       @client.get_post_or_delete_operation_result(response, deserialize_method)
      end

      promise
    end

    #
    # The operation to delete a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def begin_delete(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :delete, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 200 || status_code == 202 || status_code == 204
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?

        result
      end

      promise.execute
    end

    #
    # The operation to get a virtual machine scale set virtual machine.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def get(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :get, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 200
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?
        # Deserialize Response
        if status_code == 200
          begin
            parsed_response = response_content.to_s.empty? ? nil : JSON.load(response_content)
            unless parsed_response.nil?
              parsed_response = VirtualMachineScaleSetVM.deserialize_object(parsed_response)
            end
            result.body = parsed_response
          rescue Exception => e
            fail MsRest::DeserializationError.new('Error occurred in deserializing the response', e.message, e.backtrace, result)
          end
        end

        result
      end

      promise.execute
    end

    #
    # The operation to get a virtual machine scale set virtual machine.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def get_instance_view(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}/instanceView'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :get, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 200
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?
        # Deserialize Response
        if status_code == 200
          begin
            parsed_response = response_content.to_s.empty? ? nil : JSON.load(response_content)
            unless parsed_response.nil?
              parsed_response = VirtualMachineScaleSetVMInstanceView.deserialize_object(parsed_response)
            end
            result.body = parsed_response
          rescue Exception => e
            fail MsRest::DeserializationError.new('Error occurred in deserializing the response', e.message, e.backtrace, result)
          end
        end

        result
      end

      promise.execute
    end

    #
    # The operation to list virtual machine scale sets VMs.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param virtual_machine_scale_set_name [String] The name of the virtual
    # machine scale set.
    # @param filter [String] The filter to apply on the operation.
    # @param select [String] The list parameters.
    # @param expand [String] The expand expression to apply on the operation.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def list(resource_group_name, virtual_machine_scale_set_name, filter = nil, select = nil, expand = nil, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'virtual_machine_scale_set_name is nil' if virtual_machine_scale_set_name.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{virtualMachineScaleSetName}/virtualMachines'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'virtualMachineScaleSetName' => virtual_machine_scale_set_name,'subscriptionId' => @client.subscription_id},
          query_params: {'$filter' => filter,'$select' => select,'$expand' => expand,'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :get, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 200
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?
        # Deserialize Response
        if status_code == 200
          begin
            parsed_response = response_content.to_s.empty? ? nil : JSON.load(response_content)
            unless parsed_response.nil?
              parsed_response = VirtualMachineScaleSetVMListResult.deserialize_object(parsed_response)
            end
            result.body = parsed_response
          rescue Exception => e
            fail MsRest::DeserializationError.new('Error occurred in deserializing the response', e.message, e.backtrace, result)
          end
        end

        result
      end

      promise.execute
    end

    #
    # The operation to power off (stop) a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @return [Concurrent::Promise] promise which provides async access to http
    # response.
    #
    def power_off(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      # Send request
      promise = begin_power_off(resource_group_name, vm_scale_set_name, instance_id, custom_headers)

      promise = promise.then do |response|
        # Defining deserialization method.
        deserialize_method = lambda do |parsed_response|
        end

       # Waiting for response.
       @client.get_post_or_delete_operation_result(response, deserialize_method)
      end

      promise
    end

    #
    # The operation to power off (stop) a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def begin_power_off(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}/poweroff'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :post, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 202
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?

        result
      end

      promise.execute
    end

    #
    # The operation to restart a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @return [Concurrent::Promise] promise which provides async access to http
    # response.
    #
    def restart(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      # Send request
      promise = begin_restart(resource_group_name, vm_scale_set_name, instance_id, custom_headers)

      promise = promise.then do |response|
        # Defining deserialization method.
        deserialize_method = lambda do |parsed_response|
        end

       # Waiting for response.
       @client.get_post_or_delete_operation_result(response, deserialize_method)
      end

      promise
    end

    #
    # The operation to restart a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def begin_restart(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}/restart'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :post, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 202
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?

        result
      end

      promise.execute
    end

    #
    # The operation to start a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @return [Concurrent::Promise] promise which provides async access to http
    # response.
    #
    def start(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      # Send request
      promise = begin_start(resource_group_name, vm_scale_set_name, instance_id, custom_headers)

      promise = promise.then do |response|
        # Defining deserialization method.
        deserialize_method = lambda do |parsed_response|
        end

       # Waiting for response.
       @client.get_post_or_delete_operation_result(response, deserialize_method)
      end

      promise
    end

    #
    # The operation to start a virtual machine scale set.
    #
    # @param resource_group_name [String] The name of the resource group.
    # @param vm_scale_set_name [String] The name of the virtual machine scale set.
    # @param instance_id [String] The instance id of the virtual machine.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def begin_start(resource_group_name, vm_scale_set_name, instance_id, custom_headers = nil)
      fail ArgumentError, 'resource_group_name is nil' if resource_group_name.nil?
      fail ArgumentError, 'vm_scale_set_name is nil' if vm_scale_set_name.nil?
      fail ArgumentError, 'instance_id is nil' if instance_id.nil?
      fail ArgumentError, '@client.api_version is nil' if @client.api_version.nil?
      fail ArgumentError, '@client.subscription_id is nil' if @client.subscription_id.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Compute/virtualMachineScaleSets/{vmScaleSetName}/virtualmachines/{instanceId}/start'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          path_params: {'resourceGroupName' => resource_group_name,'vmScaleSetName' => vm_scale_set_name,'instanceId' => instance_id,'subscriptionId' => @client.subscription_id},
          query_params: {'api-version' => @client.api_version},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :post, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 202
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?

        result
      end

      promise.execute
    end

    #
    # The operation to list virtual machine scale sets VMs.
    #
    # @param next_page_link [String] The NextLink from the previous successful
    # call to List operation.
    # @param [Hash{String => String}] The hash of custom headers need to be
    # applied to HTTP request.
    #
    # @return [Concurrent::Promise] Promise object which allows to get HTTP
    # response.
    #
    def list_next(next_page_link, custom_headers = nil)
      fail ArgumentError, 'next_page_link is nil' if next_page_link.nil?
      request_headers = {}

      # Set Headers
      request_headers['x-ms-client-request-id'] = SecureRandom.uuid
      request_headers['accept-language'] = @client.accept_language unless @client.accept_language.nil?
      path_template = '{nextLink}'
      options = {
          middlewares: [[MsRest::RetryPolicyMiddleware, times: 3, retry: 0.02], [:cookie_jar]],
          skip_encoding_path_params: {'nextLink' => next_page_link},
          headers: request_headers.merge(custom_headers || {})
      }
      request = MsRest::HttpOperationRequest.new(@base_url || @client.base_url, path_template, :get, options)
      promise = request.run_promise do |req|
        @client.credentials.sign_request(req) unless @client.credentials.nil?
      end

      promise = promise.then do |http_response|
        status_code = http_response.status
        response_content = http_response.body
        unless status_code == 200
          error_model = JSON.load(response_content)
          fail MsRestAzure::AzureOperationError.new(request, http_response, error_model)
        end

        # Create Result
        result = MsRestAzure::AzureOperationResponse.new(request, http_response)
        result.request_id = http_response['x-ms-request-id'] unless http_response['x-ms-request-id'].nil?
        # Deserialize Response
        if status_code == 200
          begin
            parsed_response = response_content.to_s.empty? ? nil : JSON.load(response_content)
            unless parsed_response.nil?
              parsed_response = VirtualMachineScaleSetVMListResult.deserialize_object(parsed_response)
            end
            result.body = parsed_response
          rescue Exception => e
            fail MsRest::DeserializationError.new('Error occurred in deserializing the response', e.message, e.backtrace, result)
          end
        end

        result
      end

      promise.execute
    end

  end
end