// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://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.

// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

package cx

import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	structpb "github.com/golang/protobuf/ptypes/struct"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	cxpb "google.golang.org/genproto/googleapis/cloud/dialogflow/cx/v3"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/proto"
)

var newEnvironmentsClientHook clientHook

// EnvironmentsCallOptions contains the retry settings for each method of EnvironmentsClient.
type EnvironmentsCallOptions struct {
	ListEnvironments          []gax.CallOption
	GetEnvironment            []gax.CallOption
	CreateEnvironment         []gax.CallOption
	UpdateEnvironment         []gax.CallOption
	DeleteEnvironment         []gax.CallOption
	LookupEnvironmentHistory  []gax.CallOption
	RunContinuousTest         []gax.CallOption
	ListContinuousTestResults []gax.CallOption
	DeployFlow                []gax.CallOption
}

func defaultEnvironmentsGRPCClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("dialogflow.googleapis.com:443"),
		internaloption.WithDefaultMTLSEndpoint("dialogflow.mtls.googleapis.com:443"),
		internaloption.WithDefaultAudience("https://dialogflow.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableJwtWithScope(),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultEnvironmentsCallOptions() *EnvironmentsCallOptions {
	return &EnvironmentsCallOptions{
		ListEnvironments: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetEnvironment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		CreateEnvironment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		UpdateEnvironment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		DeleteEnvironment: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		LookupEnvironmentHistory: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		RunContinuousTest: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListContinuousTestResults: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		DeployFlow: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

// internalEnvironmentsClient is an interface that defines the methods availaible from Dialogflow API.
type internalEnvironmentsClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	ListEnvironments(context.Context, *cxpb.ListEnvironmentsRequest, ...gax.CallOption) *EnvironmentIterator
	GetEnvironment(context.Context, *cxpb.GetEnvironmentRequest, ...gax.CallOption) (*cxpb.Environment, error)
	CreateEnvironment(context.Context, *cxpb.CreateEnvironmentRequest, ...gax.CallOption) (*CreateEnvironmentOperation, error)
	CreateEnvironmentOperation(name string) *CreateEnvironmentOperation
	UpdateEnvironment(context.Context, *cxpb.UpdateEnvironmentRequest, ...gax.CallOption) (*UpdateEnvironmentOperation, error)
	UpdateEnvironmentOperation(name string) *UpdateEnvironmentOperation
	DeleteEnvironment(context.Context, *cxpb.DeleteEnvironmentRequest, ...gax.CallOption) error
	LookupEnvironmentHistory(context.Context, *cxpb.LookupEnvironmentHistoryRequest, ...gax.CallOption) *EnvironmentIterator
	RunContinuousTest(context.Context, *cxpb.RunContinuousTestRequest, ...gax.CallOption) (*RunContinuousTestOperation, error)
	RunContinuousTestOperation(name string) *RunContinuousTestOperation
	ListContinuousTestResults(context.Context, *cxpb.ListContinuousTestResultsRequest, ...gax.CallOption) *ContinuousTestResultIterator
	DeployFlow(context.Context, *cxpb.DeployFlowRequest, ...gax.CallOption) (*DeployFlowOperation, error)
	DeployFlowOperation(name string) *DeployFlowOperation
}

// EnvironmentsClient is a client for interacting with Dialogflow API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// Service for managing Environments.
type EnvironmentsClient struct {
	// The internal transport-dependent client.
	internalClient internalEnvironmentsClient

	// The call options for this service.
	CallOptions *EnvironmentsCallOptions

	// LROClient is used internally to handle long-running operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient *lroauto.OperationsClient
}

// Wrapper methods routed to the internal client.

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *EnvironmentsClient) Close() error {
	return c.internalClient.Close()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *EnvironmentsClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *EnvironmentsClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// ListEnvironments returns the list of all environments in the specified Agent.
func (c *EnvironmentsClient) ListEnvironments(ctx context.Context, req *cxpb.ListEnvironmentsRequest, opts ...gax.CallOption) *EnvironmentIterator {
	return c.internalClient.ListEnvironments(ctx, req, opts...)
}

// GetEnvironment retrieves the specified Environment.
func (c *EnvironmentsClient) GetEnvironment(ctx context.Context, req *cxpb.GetEnvironmentRequest, opts ...gax.CallOption) (*cxpb.Environment, error) {
	return c.internalClient.GetEnvironment(ctx, req, opts...)
}

// CreateEnvironment creates an Environment in the specified Agent.
//
// This method is a long-running
// operation (at https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
// The returned Operation type has the following method-specific fields:
//
//   metadata: An empty Struct
//   message (at https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
//
//   response: Environment
func (c *EnvironmentsClient) CreateEnvironment(ctx context.Context, req *cxpb.CreateEnvironmentRequest, opts ...gax.CallOption) (*CreateEnvironmentOperation, error) {
	return c.internalClient.CreateEnvironment(ctx, req, opts...)
}

// CreateEnvironmentOperation returns a new CreateEnvironmentOperation from a given name.
// The name must be that of a previously created CreateEnvironmentOperation, possibly from a different process.
func (c *EnvironmentsClient) CreateEnvironmentOperation(name string) *CreateEnvironmentOperation {
	return c.internalClient.CreateEnvironmentOperation(name)
}

// UpdateEnvironment updates the specified Environment.
//
// This method is a long-running
// operation (at https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
// The returned Operation type has the following method-specific fields:
//
//   metadata: An empty Struct
//   message (at https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct)
//
//   response: Environment
func (c *EnvironmentsClient) UpdateEnvironment(ctx context.Context, req *cxpb.UpdateEnvironmentRequest, opts ...gax.CallOption) (*UpdateEnvironmentOperation, error) {
	return c.internalClient.UpdateEnvironment(ctx, req, opts...)
}

// UpdateEnvironmentOperation returns a new UpdateEnvironmentOperation from a given name.
// The name must be that of a previously created UpdateEnvironmentOperation, possibly from a different process.
func (c *EnvironmentsClient) UpdateEnvironmentOperation(name string) *UpdateEnvironmentOperation {
	return c.internalClient.UpdateEnvironmentOperation(name)
}

// DeleteEnvironment deletes the specified Environment.
func (c *EnvironmentsClient) DeleteEnvironment(ctx context.Context, req *cxpb.DeleteEnvironmentRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteEnvironment(ctx, req, opts...)
}

// LookupEnvironmentHistory looks up the history of the specified Environment.
func (c *EnvironmentsClient) LookupEnvironmentHistory(ctx context.Context, req *cxpb.LookupEnvironmentHistoryRequest, opts ...gax.CallOption) *EnvironmentIterator {
	return c.internalClient.LookupEnvironmentHistory(ctx, req, opts...)
}

// RunContinuousTest kicks off a continuous test under the specified Environment.
//
// This method is a long-running
// operation (at https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
// The returned Operation type has the following method-specific fields:
//
//   metadata: RunContinuousTestMetadata
//
//   response: RunContinuousTestResponse
func (c *EnvironmentsClient) RunContinuousTest(ctx context.Context, req *cxpb.RunContinuousTestRequest, opts ...gax.CallOption) (*RunContinuousTestOperation, error) {
	return c.internalClient.RunContinuousTest(ctx, req, opts...)
}

// RunContinuousTestOperation returns a new RunContinuousTestOperation from a given name.
// The name must be that of a previously created RunContinuousTestOperation, possibly from a different process.
func (c *EnvironmentsClient) RunContinuousTestOperation(name string) *RunContinuousTestOperation {
	return c.internalClient.RunContinuousTestOperation(name)
}

// ListContinuousTestResults fetches a list of continuous test results for a given environment.
func (c *EnvironmentsClient) ListContinuousTestResults(ctx context.Context, req *cxpb.ListContinuousTestResultsRequest, opts ...gax.CallOption) *ContinuousTestResultIterator {
	return c.internalClient.ListContinuousTestResults(ctx, req, opts...)
}

// DeployFlow deploys a flow to the specified Environment.
//
// This method is a long-running
// operation (at https://cloud.google.com/dialogflow/cx/docs/how/long-running-operation).
// The returned Operation type has the following method-specific fields:
//
//   metadata: DeployFlowMetadata
//
//   response: DeployFlowResponse
func (c *EnvironmentsClient) DeployFlow(ctx context.Context, req *cxpb.DeployFlowRequest, opts ...gax.CallOption) (*DeployFlowOperation, error) {
	return c.internalClient.DeployFlow(ctx, req, opts...)
}

// DeployFlowOperation returns a new DeployFlowOperation from a given name.
// The name must be that of a previously created DeployFlowOperation, possibly from a different process.
func (c *EnvironmentsClient) DeployFlowOperation(name string) *DeployFlowOperation {
	return c.internalClient.DeployFlowOperation(name)
}

// environmentsGRPCClient is a client for interacting with Dialogflow API over gRPC transport.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type environmentsGRPCClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// flag to opt out of default deadlines via GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE
	disableDeadlines bool

	// Points back to the CallOptions field of the containing EnvironmentsClient
	CallOptions **EnvironmentsCallOptions

	// The gRPC API client.
	environmentsClient cxpb.EnvironmentsClient

	// LROClient is used internally to handle long-running operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient **lroauto.OperationsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
}

// NewEnvironmentsClient creates a new environments client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// Service for managing Environments.
func NewEnvironmentsClient(ctx context.Context, opts ...option.ClientOption) (*EnvironmentsClient, error) {
	clientOpts := defaultEnvironmentsGRPCClientOptions()
	if newEnvironmentsClientHook != nil {
		hookOpts, err := newEnvironmentsClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	disableDeadlines, err := checkDisableDeadlines()
	if err != nil {
		return nil, err
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	client := EnvironmentsClient{CallOptions: defaultEnvironmentsCallOptions()}

	c := &environmentsGRPCClient{
		connPool:           connPool,
		disableDeadlines:   disableDeadlines,
		environmentsClient: cxpb.NewEnvironmentsClient(connPool),
		CallOptions:        &client.CallOptions,
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	client.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
	if err != nil {
		// This error "should not happen", since we are just reusing old connection pool
		// and never actually need to dial.
		// If this does happen, we could leak connp. However, we cannot close conn:
		// If the user invoked the constructor with option.WithGRPCConn,
		// we would close a connection that's still in use.
		// TODO: investigate error conditions.
		return nil, err
	}
	c.LROClient = &client.LROClient
	return &client, nil
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *environmentsGRPCClient) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *environmentsGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *environmentsGRPCClient) Close() error {
	return c.connPool.Close()
}

func (c *environmentsGRPCClient) ListEnvironments(ctx context.Context, req *cxpb.ListEnvironmentsRequest, opts ...gax.CallOption) *EnvironmentIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).ListEnvironments[0:len((*c.CallOptions).ListEnvironments):len((*c.CallOptions).ListEnvironments)], opts...)
	it := &EnvironmentIterator{}
	req = proto.Clone(req).(*cxpb.ListEnvironmentsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*cxpb.Environment, string, error) {
		resp := &cxpb.ListEnvironmentsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.environmentsClient.ListEnvironments(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetEnvironments(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *environmentsGRPCClient) GetEnvironment(ctx context.Context, req *cxpb.GetEnvironmentRequest, opts ...gax.CallOption) (*cxpb.Environment, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).GetEnvironment[0:len((*c.CallOptions).GetEnvironment):len((*c.CallOptions).GetEnvironment)], opts...)
	var resp *cxpb.Environment
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.environmentsClient.GetEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *environmentsGRPCClient) CreateEnvironment(ctx context.Context, req *cxpb.CreateEnvironmentRequest, opts ...gax.CallOption) (*CreateEnvironmentOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).CreateEnvironment[0:len((*c.CallOptions).CreateEnvironment):len((*c.CallOptions).CreateEnvironment)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.environmentsClient.CreateEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &CreateEnvironmentOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *environmentsGRPCClient) UpdateEnvironment(ctx context.Context, req *cxpb.UpdateEnvironmentRequest, opts ...gax.CallOption) (*UpdateEnvironmentOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "environment.name", url.QueryEscape(req.GetEnvironment().GetName())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).UpdateEnvironment[0:len((*c.CallOptions).UpdateEnvironment):len((*c.CallOptions).UpdateEnvironment)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.environmentsClient.UpdateEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &UpdateEnvironmentOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *environmentsGRPCClient) DeleteEnvironment(ctx context.Context, req *cxpb.DeleteEnvironmentRequest, opts ...gax.CallOption) error {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).DeleteEnvironment[0:len((*c.CallOptions).DeleteEnvironment):len((*c.CallOptions).DeleteEnvironment)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.environmentsClient.DeleteEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *environmentsGRPCClient) LookupEnvironmentHistory(ctx context.Context, req *cxpb.LookupEnvironmentHistoryRequest, opts ...gax.CallOption) *EnvironmentIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).LookupEnvironmentHistory[0:len((*c.CallOptions).LookupEnvironmentHistory):len((*c.CallOptions).LookupEnvironmentHistory)], opts...)
	it := &EnvironmentIterator{}
	req = proto.Clone(req).(*cxpb.LookupEnvironmentHistoryRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*cxpb.Environment, string, error) {
		resp := &cxpb.LookupEnvironmentHistoryResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.environmentsClient.LookupEnvironmentHistory(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetEnvironments(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *environmentsGRPCClient) RunContinuousTest(ctx context.Context, req *cxpb.RunContinuousTestRequest, opts ...gax.CallOption) (*RunContinuousTestOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "environment", url.QueryEscape(req.GetEnvironment())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).RunContinuousTest[0:len((*c.CallOptions).RunContinuousTest):len((*c.CallOptions).RunContinuousTest)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.environmentsClient.RunContinuousTest(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &RunContinuousTestOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *environmentsGRPCClient) ListContinuousTestResults(ctx context.Context, req *cxpb.ListContinuousTestResultsRequest, opts ...gax.CallOption) *ContinuousTestResultIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).ListContinuousTestResults[0:len((*c.CallOptions).ListContinuousTestResults):len((*c.CallOptions).ListContinuousTestResults)], opts...)
	it := &ContinuousTestResultIterator{}
	req = proto.Clone(req).(*cxpb.ListContinuousTestResultsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*cxpb.ContinuousTestResult, string, error) {
		resp := &cxpb.ListContinuousTestResultsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.environmentsClient.ListContinuousTestResults(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetContinuousTestResults(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *environmentsGRPCClient) DeployFlow(ctx context.Context, req *cxpb.DeployFlowRequest, opts ...gax.CallOption) (*DeployFlowOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "environment", url.QueryEscape(req.GetEnvironment())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).DeployFlow[0:len((*c.CallOptions).DeployFlow):len((*c.CallOptions).DeployFlow)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.environmentsClient.DeployFlow(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeployFlowOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

// CreateEnvironmentOperation manages a long-running operation from CreateEnvironment.
type CreateEnvironmentOperation struct {
	lro *longrunning.Operation
}

// CreateEnvironmentOperation returns a new CreateEnvironmentOperation from a given name.
// The name must be that of a previously created CreateEnvironmentOperation, possibly from a different process.
func (c *environmentsGRPCClient) CreateEnvironmentOperation(name string) *CreateEnvironmentOperation {
	return &CreateEnvironmentOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *CreateEnvironmentOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*cxpb.Environment, error) {
	var resp cxpb.Environment
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *CreateEnvironmentOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*cxpb.Environment, error) {
	var resp cxpb.Environment
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *CreateEnvironmentOperation) Metadata() (*structpb.Struct, error) {
	var meta structpb.Struct
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *CreateEnvironmentOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *CreateEnvironmentOperation) Name() string {
	return op.lro.Name()
}

// DeployFlowOperation manages a long-running operation from DeployFlow.
type DeployFlowOperation struct {
	lro *longrunning.Operation
}

// DeployFlowOperation returns a new DeployFlowOperation from a given name.
// The name must be that of a previously created DeployFlowOperation, possibly from a different process.
func (c *environmentsGRPCClient) DeployFlowOperation(name string) *DeployFlowOperation {
	return &DeployFlowOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeployFlowOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*cxpb.DeployFlowResponse, error) {
	var resp cxpb.DeployFlowResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *DeployFlowOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*cxpb.DeployFlowResponse, error) {
	var resp cxpb.DeployFlowResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *DeployFlowOperation) Metadata() (*cxpb.DeployFlowMetadata, error) {
	var meta cxpb.DeployFlowMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *DeployFlowOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *DeployFlowOperation) Name() string {
	return op.lro.Name()
}

// RunContinuousTestOperation manages a long-running operation from RunContinuousTest.
type RunContinuousTestOperation struct {
	lro *longrunning.Operation
}

// RunContinuousTestOperation returns a new RunContinuousTestOperation from a given name.
// The name must be that of a previously created RunContinuousTestOperation, possibly from a different process.
func (c *environmentsGRPCClient) RunContinuousTestOperation(name string) *RunContinuousTestOperation {
	return &RunContinuousTestOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *RunContinuousTestOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*cxpb.RunContinuousTestResponse, error) {
	var resp cxpb.RunContinuousTestResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *RunContinuousTestOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*cxpb.RunContinuousTestResponse, error) {
	var resp cxpb.RunContinuousTestResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *RunContinuousTestOperation) Metadata() (*cxpb.RunContinuousTestMetadata, error) {
	var meta cxpb.RunContinuousTestMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *RunContinuousTestOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *RunContinuousTestOperation) Name() string {
	return op.lro.Name()
}

// UpdateEnvironmentOperation manages a long-running operation from UpdateEnvironment.
type UpdateEnvironmentOperation struct {
	lro *longrunning.Operation
}

// UpdateEnvironmentOperation returns a new UpdateEnvironmentOperation from a given name.
// The name must be that of a previously created UpdateEnvironmentOperation, possibly from a different process.
func (c *environmentsGRPCClient) UpdateEnvironmentOperation(name string) *UpdateEnvironmentOperation {
	return &UpdateEnvironmentOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *UpdateEnvironmentOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*cxpb.Environment, error) {
	var resp cxpb.Environment
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *UpdateEnvironmentOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*cxpb.Environment, error) {
	var resp cxpb.Environment
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *UpdateEnvironmentOperation) Metadata() (*structpb.Struct, error) {
	var meta structpb.Struct
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *UpdateEnvironmentOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *UpdateEnvironmentOperation) Name() string {
	return op.lro.Name()
}

// ContinuousTestResultIterator manages a stream of *cxpb.ContinuousTestResult.
type ContinuousTestResultIterator struct {
	items    []*cxpb.ContinuousTestResult
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*cxpb.ContinuousTestResult, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *ContinuousTestResultIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *ContinuousTestResultIterator) Next() (*cxpb.ContinuousTestResult, error) {
	var item *cxpb.ContinuousTestResult
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *ContinuousTestResultIterator) bufLen() int {
	return len(it.items)
}

func (it *ContinuousTestResultIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// EnvironmentIterator manages a stream of *cxpb.Environment.
type EnvironmentIterator struct {
	items    []*cxpb.Environment
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*cxpb.Environment, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *EnvironmentIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *EnvironmentIterator) Next() (*cxpb.Environment, error) {
	var item *cxpb.Environment
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *EnvironmentIterator) bufLen() int {
	return len(it.items)
}

func (it *EnvironmentIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}