using Amazon.CloudSearchDomain.Model;
using Amazon.Runtime;
using Amazon.Runtime.Internal;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Amazon.CloudSearchDomain.Internal
{
    /// <summary>
    /// Custom pipeline handler to make sure streams.
    /// </summary>
    public class ValidationResponseHandler : PipelineHandler
    {

#if BCL
        /// <summary>
        /// Calls the post invoke logic after calling the next handler 
        /// in the pipeline.
        /// </summary>
        /// <param name="executionContext">The execution context which contains both the
        /// requests and response context.</param>
        public override void InvokeSync(IExecutionContext executionContext)
        {
            base.InvokeSync(executionContext);
            PostInvoke(executionContext);
        }
#endif

#if BCL45

        /// <summary>
        /// Calls the and post invoke logic after calling the next handler 
        /// in the pipeline.
        /// </summary>
        /// <typeparam name="T">The response type for the current request.</typeparam>
        /// <param name="executionContext">The execution context, it contains the
        /// request and response context.</param>
        /// <returns>A task that represents the asynchronous operation.</returns>
        public override async System.Threading.Tasks.Task<T> InvokeAsync<T>(IExecutionContext executionContext)
        {
            var response = await base.InvokeAsync<T>(executionContext).ConfigureAwait(false);
            PostInvoke(executionContext);
            return response;
        }

#elif AWS_APM_API

        /// <summary>
        /// Calls the PostInvoke methods after calling the next handler 
        /// in the pipeline.
        /// </summary>
        /// <param name="executionContext">The execution context, it contains the
        /// request and response context.</param>
        protected override void InvokeAsyncCallback(IAsyncExecutionContext executionContext)
        {   
            // Process the response if an exception hasn't occured
            if (executionContext.ResponseContext.AsyncResult.Exception == null)
            {
                PostInvoke(ExecutionContext.CreateFromAsyncContext(executionContext));
            }
            base.InvokeAsyncCallback(executionContext);
        }
#endif

#if BCL
        /// <summary>
        /// Custom pipeline handler to make sure streams.
        /// </summary>
        /// <param name="executionContext"></param>
        protected virtual void PostInvoke(IExecutionContext executionContext)
        {
            var uploadDocumentsRequest = executionContext.RequestContext.OriginalRequest as UploadDocumentsRequest;

            if (uploadDocumentsRequest != null)
            {
                // If Documents property is set as the underlying stream for FilePath, dispose it.
                if (uploadDocumentsRequest.Documents != null && !string.IsNullOrEmpty(uploadDocumentsRequest.FilePath))
                {
                    uploadDocumentsRequest.Documents.Dispose();
                    uploadDocumentsRequest.Documents = null;
                }
            }
        }
#endif
    }
}