// Copyright 2019 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 gapic-generator. DO NOT EDIT.

package dialogflow

import (
	"context"
	"fmt"
	"math"
	"time"

	"github.com/golang/protobuf/proto"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/transport"
	dialogflowpb "google.golang.org/genproto/googleapis/cloud/dialogflow/v2"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
)

// SessionEntityTypesCallOptions contains the retry settings for each method of SessionEntityTypesClient.
type SessionEntityTypesCallOptions struct {
	ListSessionEntityTypes  []gax.CallOption
	GetSessionEntityType    []gax.CallOption
	CreateSessionEntityType []gax.CallOption
	UpdateSessionEntityType []gax.CallOption
	DeleteSessionEntityType []gax.CallOption
}

func defaultSessionEntityTypesClientOptions() []option.ClientOption {
	return []option.ClientOption{
		option.WithEndpoint("dialogflow.googleapis.com:443"),
		option.WithScopes(DefaultAuthScopes()...),
	}
}

func defaultSessionEntityTypesCallOptions() *SessionEntityTypesCallOptions {
	retry := map[[2]string][]gax.CallOption{
		{"default", "idempotent"}: {
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.3,
				})
			}),
		},
	}
	return &SessionEntityTypesCallOptions{
		ListSessionEntityTypes:  retry[[2]string{"default", "idempotent"}],
		GetSessionEntityType:    retry[[2]string{"default", "idempotent"}],
		CreateSessionEntityType: retry[[2]string{"default", "non_idempotent"}],
		UpdateSessionEntityType: retry[[2]string{"default", "non_idempotent"}],
		DeleteSessionEntityType: retry[[2]string{"default", "idempotent"}],
	}
}

// SessionEntityTypesClient 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.
type SessionEntityTypesClient struct {
	// The connection to the service.
	conn *grpc.ClientConn

	// The gRPC API client.
	sessionEntityTypesClient dialogflowpb.SessionEntityTypesClient

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

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

// NewSessionEntityTypesClient creates a new session entity types client.
//
// Entities are extracted from user input and represent parameters that are
// meaningful to your application. For example, a date range, a proper name
// such as a geographic location or landmark, and so on. Entities represent
// actionable data for your application.
//
// Session entity types are referred to as **User** entity types and are
// entities that are built for an individual user such as
// favorites, preferences, playlists, and so on. You can redefine a session
// entity type at the session level.
//
// For more information about entity types, see the
// [Dialogflow
// documentation](https://cloud.google.com/dialogflow-enterprise/docs/entities-overview).
func NewSessionEntityTypesClient(ctx context.Context, opts ...option.ClientOption) (*SessionEntityTypesClient, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultSessionEntityTypesClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &SessionEntityTypesClient{
		conn:        conn,
		CallOptions: defaultSessionEntityTypesCallOptions(),

		sessionEntityTypesClient: dialogflowpb.NewSessionEntityTypesClient(conn),
	}
	c.setGoogleClientInfo()
	return c, nil
}

// Connection returns the client's connection to the API service.
func (c *SessionEntityTypesClient) Connection() *grpc.ClientConn {
	return c.conn
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *SessionEntityTypesClient) Close() error {
	return c.conn.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 *SessionEntityTypesClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// ListSessionEntityTypes returns the list of all session entity types in the specified session.
func (c *SessionEntityTypesClient) ListSessionEntityTypes(ctx context.Context, req *dialogflowpb.ListSessionEntityTypesRequest, opts ...gax.CallOption) *SessionEntityTypeIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", req.GetParent()))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ListSessionEntityTypes[0:len(c.CallOptions.ListSessionEntityTypes):len(c.CallOptions.ListSessionEntityTypes)], opts...)
	it := &SessionEntityTypeIterator{}
	req = proto.Clone(req).(*dialogflowpb.ListSessionEntityTypesRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*dialogflowpb.SessionEntityType, string, error) {
		var resp *dialogflowpb.ListSessionEntityTypesResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.sessionEntityTypesClient.ListSessionEntityTypes(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}
		return resp.SessionEntityTypes, resp.NextPageToken, 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.PageSize)
	it.pageInfo.Token = req.PageToken
	return it
}

// GetSessionEntityType retrieves the specified session entity type.
func (c *SessionEntityTypesClient) GetSessionEntityType(ctx context.Context, req *dialogflowpb.GetSessionEntityTypeRequest, opts ...gax.CallOption) (*dialogflowpb.SessionEntityType, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", req.GetName()))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetSessionEntityType[0:len(c.CallOptions.GetSessionEntityType):len(c.CallOptions.GetSessionEntityType)], opts...)
	var resp *dialogflowpb.SessionEntityType
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.sessionEntityTypesClient.GetSessionEntityType(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateSessionEntityType creates a session entity type.
//
// If the specified session entity type already exists, overrides the session
// entity type.
func (c *SessionEntityTypesClient) CreateSessionEntityType(ctx context.Context, req *dialogflowpb.CreateSessionEntityTypeRequest, opts ...gax.CallOption) (*dialogflowpb.SessionEntityType, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", req.GetParent()))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateSessionEntityType[0:len(c.CallOptions.CreateSessionEntityType):len(c.CallOptions.CreateSessionEntityType)], opts...)
	var resp *dialogflowpb.SessionEntityType
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.sessionEntityTypesClient.CreateSessionEntityType(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateSessionEntityType updates the specified session entity type.
func (c *SessionEntityTypesClient) UpdateSessionEntityType(ctx context.Context, req *dialogflowpb.UpdateSessionEntityTypeRequest, opts ...gax.CallOption) (*dialogflowpb.SessionEntityType, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "session_entity_type.name", req.GetSessionEntityType().GetName()))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpdateSessionEntityType[0:len(c.CallOptions.UpdateSessionEntityType):len(c.CallOptions.UpdateSessionEntityType)], opts...)
	var resp *dialogflowpb.SessionEntityType
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.sessionEntityTypesClient.UpdateSessionEntityType(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteSessionEntityType deletes the specified session entity type.
func (c *SessionEntityTypesClient) DeleteSessionEntityType(ctx context.Context, req *dialogflowpb.DeleteSessionEntityTypeRequest, opts ...gax.CallOption) error {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", req.GetName()))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteSessionEntityType[0:len(c.CallOptions.DeleteSessionEntityType):len(c.CallOptions.DeleteSessionEntityType)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.sessionEntityTypesClient.DeleteSessionEntityType(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

// SessionEntityTypeIterator manages a stream of *dialogflowpb.SessionEntityType.
type SessionEntityTypeIterator struct {
	items    []*dialogflowpb.SessionEntityType
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// 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 []*dialogflowpb.SessionEntityType, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *SessionEntityTypeIterator) 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 *SessionEntityTypeIterator) Next() (*dialogflowpb.SessionEntityType, error) {
	var item *dialogflowpb.SessionEntityType
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

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

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