// <copyright file="BatchExportActivityProcessorOptions.cs" company="OpenTelemetry Authors">
// Copyright The 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>

#nullable enable

using System;
using System.Diagnostics;
using Microsoft.Extensions.Configuration;
using OpenTelemetry.Internal;

namespace OpenTelemetry.Trace
{
    /// <summary>
    /// Batch span processor options.
    /// OTEL_BSP_MAX_QUEUE_SIZE, OTEL_BSP_MAX_EXPORT_BATCH_SIZE, OTEL_BSP_EXPORT_TIMEOUT, OTEL_BSP_SCHEDULE_DELAY
    /// environment variables are parsed during object construction.
    /// </summary>
    /// <remarks>
    /// The constructor throws <see cref="FormatException"/> if it fails to parse
    /// any of the supported environment variables.
    /// </remarks>
    public class BatchExportActivityProcessorOptions : BatchExportProcessorOptions<Activity>
    {
        internal const string MaxQueueSizeEnvVarKey = "OTEL_BSP_MAX_QUEUE_SIZE";

        internal const string MaxExportBatchSizeEnvVarKey = "OTEL_BSP_MAX_EXPORT_BATCH_SIZE";

        internal const string ExporterTimeoutEnvVarKey = "OTEL_BSP_EXPORT_TIMEOUT";

        internal const string ScheduledDelayEnvVarKey = "OTEL_BSP_SCHEDULE_DELAY";

        /// <summary>
        /// Initializes a new instance of the <see cref="BatchExportActivityProcessorOptions"/> class.
        /// </summary>
        public BatchExportActivityProcessorOptions()
            : this(new ConfigurationBuilder().AddEnvironmentVariables().Build())
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="BatchExportActivityProcessorOptions"/> class.
        /// </summary>
        /// <param name="configuration"><see cref="IConfiguration"/>.</param>
        public BatchExportActivityProcessorOptions(IConfiguration configuration)
        {
            if (configuration.TryGetIntValue(ExporterTimeoutEnvVarKey, out int value))
            {
                this.ExporterTimeoutMilliseconds = value;
            }

            if (configuration.TryGetIntValue(MaxExportBatchSizeEnvVarKey, out value))
            {
                this.MaxExportBatchSize = value;
            }

            if (configuration.TryGetIntValue(MaxQueueSizeEnvVarKey, out value))
            {
                this.MaxQueueSize = value;
            }

            if (configuration.TryGetIntValue(ScheduledDelayEnvVarKey, out value))
            {
                this.ScheduledDelayMilliseconds = value;
            }
        }
    }
}
