// Copyright 2018 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.

// AUTO-GENERATED CODE. DO NOT EDIT.

package contextgraph

import (
	gax "github.com/googleapis/gax-go"
	"golang.org/x/net/context"
	"google.golang.org/api/option"
	"google.golang.org/api/transport"
	"google.golang.org/grpc"
	"google.golang.org/grpc/metadata"

	"istio.io/istio/mixer/adapter/stackdriver/internal/cloud.google.com/go/internal/version"
	contextgraphpb "istio.io/istio/mixer/adapter/stackdriver/internal/google.golang.org/genproto/googleapis/cloud/contextgraph/v1alpha1"
)

// CallOptions contains the retry settings for each method of Client.
type CallOptions struct {
	AssertBatch []gax.CallOption
}

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

func defaultCallOptions() *CallOptions {
	retry := map[[2]string][]gax.CallOption{}
	return &CallOptions{
		AssertBatch: retry[[2]string{"default", "non_idempotent"}],
	}
}

// Client is a client for interacting with Stackdriver Context API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type Client struct {
	// The connection to the service.
	conn *grpc.ClientConn

	// The gRPC API client.
	client contextgraphpb.ContextGraphServiceClient

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

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

// NewClient creates a new context graph service client.
//
// Access the Stackdriver Context Graph.
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &Client{
		conn:        conn,
		CallOptions: defaultCallOptions(),

		client: contextgraphpb.NewContextGraphServiceClient(conn),
	}
	c.setGoogleClientInfo()
	return c, nil
}

// Connection returns the client's connection to the API service.
func (c *Client) 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 *Client) 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 *Client) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", version.Go()}, keyval...)
	kv = append(kv, "gapic", version.Repo, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// AssertBatch make a lot of assertions in one RPC.
//
// Empty batches will be rejected (ones with zero assertions).
//
// The timeline for each entity / relationship can be imagined as a sparse
// array mapping timestamps to assertions.  When AssertBatch is called, the
// assertions in the batch are written to this timeline, possibly overwriting
// existing assertions for the same entities / relationships at the given
// timestamps.
//
// If a given entity / relationship is asserted twice at the same timestamp,
// whether in the same batch or not, it is undefined which one is stored in
// the timeline.
func (c *Client) AssertBatch(ctx context.Context, req *contextgraphpb.AssertBatchRequest, opts ...gax.CallOption) (*contextgraphpb.AssertBatchResponse, error) {
	ctx = insertMetadata(ctx, c.xGoogMetadata)
	opts = append(c.CallOptions.AssertBatch[0:len(c.CallOptions.AssertBatch):len(c.CallOptions.AssertBatch)], opts...)
	var resp *contextgraphpb.AssertBatchResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.client.AssertBatch(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}
