// Copyright 2016, Google Inc. All rights reserved.
//
// 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
//
//     http://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.

// AUTO-GENERATED CODE. DO NOT EDIT.

package monitoring

import (
	"fmt"
	"math"
	"runtime"
	"strings"
	"time"

	gax "github.com/googleapis/gax-go"
	"golang.org/x/net/context"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/transport"
	monitoredrespb "google.golang.org/genproto/googleapis/api/monitoredres"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
)

var (
	groupProjectPathTemplate = gax.MustCompilePathTemplate("projects/{project}")
	groupGroupPathTemplate   = gax.MustCompilePathTemplate("projects/{project}/groups/{group}")
)

// GroupCallOptions contains the retry settings for each method of GroupClient.
type GroupCallOptions struct {
	ListGroups       []gax.CallOption
	GetGroup         []gax.CallOption
	CreateGroup      []gax.CallOption
	UpdateGroup      []gax.CallOption
	DeleteGroup      []gax.CallOption
	ListGroupMembers []gax.CallOption
}

func defaultGroupClientOptions() []option.ClientOption {
	return []option.ClientOption{
		option.WithEndpoint("monitoring.googleapis.com:443"),
		option.WithScopes(
			"https://www.googleapis.com/auth/cloud-platform",
			"https://www.googleapis.com/auth/monitoring",
			"https://www.googleapis.com/auth/monitoring.read",
			"https://www.googleapis.com/auth/monitoring.write",
		),
	}
}

func defaultGroupCallOptions() *GroupCallOptions {
	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 &GroupCallOptions{
		ListGroups:       retry[[2]string{"default", "idempotent"}],
		GetGroup:         retry[[2]string{"default", "idempotent"}],
		CreateGroup:      retry[[2]string{"default", "non_idempotent"}],
		UpdateGroup:      retry[[2]string{"default", "idempotent"}],
		DeleteGroup:      retry[[2]string{"default", "idempotent"}],
		ListGroupMembers: retry[[2]string{"default", "idempotent"}],
	}
}

// GroupClient is a client for interacting with Stackdriver Monitoring API.
type GroupClient struct {
	// The connection to the service.
	conn *grpc.ClientConn

	// The gRPC API client.
	groupClient monitoringpb.GroupServiceClient

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

	// The metadata to be sent with each request.
	metadata metadata.MD
}

// NewGroupClient creates a new group service client.
//
// The Group API lets you inspect and manage your
// [groups](google.monitoring.v3.Group).
//
// A group is a named filter that is used to identify
// a collection of monitored resources. Groups are typically used to
// mirror the physical and/or logical topology of the environment.
// Because group membership is computed dynamically, monitored
// resources that are started in the future are automatically placed
// in matching groups. By using a group to name monitored resources in,
// for example, an alert policy, the target of that alert policy is
// updated automatically as monitored resources are added and removed
// from the infrastructure.
func NewGroupClient(ctx context.Context, opts ...option.ClientOption) (*GroupClient, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultGroupClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &GroupClient{
		conn:        conn,
		CallOptions: defaultGroupCallOptions(),

		groupClient: monitoringpb.NewGroupServiceClient(conn),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
}

// Connection returns the client's connection to the API service.
func (c *GroupClient) 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 *GroupClient) 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 *GroupClient) SetGoogleClientInfo(name, version string) {
	goVersion := strings.Replace(runtime.Version(), " ", "_", -1)
	v := fmt.Sprintf("%s/%s %s gax/%s go/%s", name, version, gapicNameVersion, gax.Version, goVersion)
	c.metadata = metadata.Pairs("x-goog-api-client", v)
}

// GroupProjectPath returns the path for the project resource.
func GroupProjectPath(project string) string {
	path, err := groupProjectPathTemplate.Render(map[string]string{
		"project": project,
	})
	if err != nil {
		panic(err)
	}
	return path
}

// GroupGroupPath returns the path for the group resource.
func GroupGroupPath(project, group string) string {
	path, err := groupGroupPathTemplate.Render(map[string]string{
		"project": project,
		"group":   group,
	})
	if err != nil {
		panic(err)
	}
	return path
}

// ListGroups lists the existing groups.
func (c *GroupClient) ListGroups(ctx context.Context, req *monitoringpb.ListGroupsRequest) *GroupIterator {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	it := &GroupIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoringpb.Group, string, error) {
		var resp *monitoringpb.ListGroupsResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context) error {
			var err error
			resp, err = c.groupClient.ListGroups(ctx, req)
			return err
		}, c.CallOptions.ListGroups...)
		if err != nil {
			return nil, "", err
		}
		return resp.Group, 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)
	return it
}

// GetGroup gets a single group.
func (c *GroupClient) GetGroup(ctx context.Context, req *monitoringpb.GetGroupRequest) (*monitoringpb.Group, error) {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	var resp *monitoringpb.Group
	err := gax.Invoke(ctx, func(ctx context.Context) error {
		var err error
		resp, err = c.groupClient.GetGroup(ctx, req)
		return err
	}, c.CallOptions.GetGroup...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateGroup creates a new group.
func (c *GroupClient) CreateGroup(ctx context.Context, req *monitoringpb.CreateGroupRequest) (*monitoringpb.Group, error) {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	var resp *monitoringpb.Group
	err := gax.Invoke(ctx, func(ctx context.Context) error {
		var err error
		resp, err = c.groupClient.CreateGroup(ctx, req)
		return err
	}, c.CallOptions.CreateGroup...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpdateGroup updates an existing group.
// You can change any group attributes except `name`.
func (c *GroupClient) UpdateGroup(ctx context.Context, req *monitoringpb.UpdateGroupRequest) (*monitoringpb.Group, error) {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	var resp *monitoringpb.Group
	err := gax.Invoke(ctx, func(ctx context.Context) error {
		var err error
		resp, err = c.groupClient.UpdateGroup(ctx, req)
		return err
	}, c.CallOptions.UpdateGroup...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// DeleteGroup deletes an existing group.
func (c *GroupClient) DeleteGroup(ctx context.Context, req *monitoringpb.DeleteGroupRequest) error {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	err := gax.Invoke(ctx, func(ctx context.Context) error {
		var err error
		_, err = c.groupClient.DeleteGroup(ctx, req)
		return err
	}, c.CallOptions.DeleteGroup...)
	return err
}

// ListGroupMembers lists the monitored resources that are members of a group.
func (c *GroupClient) ListGroupMembers(ctx context.Context, req *monitoringpb.ListGroupMembersRequest) *MonitoredResourceIterator {
	md, _ := metadata.FromContext(ctx)
	ctx = metadata.NewContext(ctx, metadata.Join(md, c.metadata))
	it := &MonitoredResourceIterator{}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*monitoredrespb.MonitoredResource, string, error) {
		var resp *monitoringpb.ListGroupMembersResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context) error {
			var err error
			resp, err = c.groupClient.ListGroupMembers(ctx, req)
			return err
		}, c.CallOptions.ListGroupMembers...)
		if err != nil {
			return nil, "", err
		}
		return resp.Members, 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)
	return it
}

// GroupIterator manages a stream of *monitoringpb.Group.
type GroupIterator struct {
	items    []*monitoringpb.Group
	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 []*monitoringpb.Group, nextPageToken string, err error)
}

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

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

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

// MonitoredResourceIterator manages a stream of *monitoredrespb.MonitoredResource.
type MonitoredResourceIterator struct {
	items    []*monitoredrespb.MonitoredResource
	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 []*monitoredrespb.MonitoredResource, nextPageToken string, err error)
}

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

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

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