// <copyright file="Batch.cs" company="OpenTelemetry Authors">
// Copyright 2018, OpenTelemetry Authors
//
// 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.
// </copyright>

namespace OpenTelemetry.Exporter.Jaeger.Implimentation
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Threading;
    using System.Threading.Tasks;

#if NET46
    using Thrift.Protocol;
#else
    using Thrift.Protocols;
    using Thrift.Protocols.Entities;
    using Thrift.Protocols.Utilities;
#endif

    public class Batch : TAbstractBase
    {
        public Batch()
        {
        }

        public Batch(Process process, List<JaegerSpan> spans)
            : this()
        {
            this.Process = process;
            this.Spans = spans;
        }

        public Process Process { get; set; }

        public List<JaegerSpan> Spans { get; set; }

#if NET46

        public void Write(TProtocol oprot)
        {
            oprot.IncrementRecursionDepth();
            try
            {
                var struc = new TStruct("Batch");

                oprot.WriteStructBegin(struc);

                var field = new TField
                {
                    Name = "process",
                    Type = TType.Struct,
                    ID = 1,
                };

                oprot.WriteFieldBegin(field);
                this.Process.Write(oprot);
                oprot.WriteFieldEnd();

                field.Name = "spans";
                field.Type = TType.List;
                field.ID = 2;

                oprot.WriteFieldBegin(field);
                {
                    oprot.WriteListBegin(new TList(TType.Struct, this.Spans.Count));
                    foreach (var s in this.Spans)
                    {
                        s.Write(oprot);
                    }

                    oprot.WriteListEnd();
                }

                oprot.WriteFieldEnd();
                oprot.WriteFieldStop();
                oprot.WriteStructEnd();
            }
            finally
            {
                oprot.DecrementRecursionDepth();
            }
        }

#else

        public async Task WriteAsync(TProtocol oprot, CancellationToken cancellationToken)
        {
            oprot.IncrementRecursionDepth();
            try
            {
                var struc = new TStruct("Batch");

                await oprot.WriteStructBeginAsync(struc, cancellationToken);

                var field = new TField
                {
                    Name = "process",
                    Type = TType.Struct,
                    ID = 1,
                };

                await oprot.WriteFieldBeginAsync(field, cancellationToken);
                await this.Process.WriteAsync(oprot, cancellationToken);
                await oprot.WriteFieldEndAsync(cancellationToken);

                field.Name = "spans";
                field.Type = TType.List;
                field.ID = 2;

                await oprot.WriteFieldBeginAsync(field, cancellationToken);
                {
                    await oprot.WriteListBeginAsync(new TList(TType.Struct, this.Spans.Count), cancellationToken);
                    foreach (JaegerSpan s in this.Spans)
                    {
                        await s.WriteAsync(oprot, cancellationToken);
                    }

                    await oprot.WriteListEndAsync(cancellationToken);
                }

                await oprot.WriteFieldEndAsync(cancellationToken);
                await oprot.WriteFieldStopAsync(cancellationToken);
                await oprot.WriteStructEndAsync(cancellationToken);
            }
            finally
            {
                oprot.DecrementRecursionDepth();
            }
        }

#endif

        public override string ToString()
        {
            var sb = new StringBuilder("Batch(");
            sb.Append(", Process: ");
            sb.Append(this.Process == null ? "<null>" : this.Process.ToString());
            sb.Append(", Spans: ");
            sb.Append(this.Spans);
            sb.Append(")");
            return sb.ToString();
        }
    }
}