using System;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.IO;

using System.Linq;

using System.Net.Http;

using System.Threading;

using System.Threading.Tasks;

namespace SMSApi.Api

{

public static class NativeHttpClientHelper

{

public static async Task<HttpResponseEntity> SendRequest(

this HttpClient httpClient,

RequestMethod method,

string uri,

NameValueCollection body = null,

Dictionary<string, Stream> files = null,

CancellationToken cancellationToken = default

)

{

HttpContent httpContent;

switch (method)

{

case RequestMethod.GET:

var getResponse = await httpClient.GetAsync(uri, cancellationToken);

return new HttpResponseEntity(getResponse.Content.ReadAsStreamAsync(), getResponse.StatusCode);

case RequestMethod.POST:

httpContent = ConvertNameValueCollectionToHttpContent(body, files);

var postResponse = await httpClient.PostAsync(uri, httpContent, cancellationToken);

return new HttpResponseEntity(postResponse.Content.ReadAsStreamAsync(), postResponse.StatusCode);

case RequestMethod.PUT:

httpContent = ConvertNameValueCollectionToHttpContent(body, files);

var putResponse = await httpClient.PutAsync(uri, httpContent, cancellationToken);

return new HttpResponseEntity(putResponse.Content.ReadAsStreamAsync(), putResponse.StatusCode);

case RequestMethod.DELETE:

var deleteResult = await httpClient.DeleteAsync(uri, cancellationToken);

return new HttpResponseEntity(deleteResult.Content.ReadAsStreamAsync(), deleteResult.StatusCode);

default:

throw new ArgumentOutOfRangeException(nameof(method), method, null);

}

}

private static HttpContent ConvertNameValueCollectionToHttpContent(

NameValueCollection collection,

Dictionary<string, Stream> files = null

)

{

var contentCollectionKeys = collection.AllKeys;

var contentCollection = contentCollectionKeys

.Select(key => new KeyValuePair<string, string>(key, collection[key]))

.ToList();

var formUrlEncodedContent = new FormUrlEncodedContent(contentCollection);

if (files == null) return formUrlEncodedContent;

var multipartContent = new MultipartFormDataContent();

foreach (var keyValuePair in contentCollection)

multipartContent.Add(new StringContent(keyValuePair.Value), keyValuePair.Key);

files

.ToList()

.ForEach(pair => multipartContent.Add(new StreamContent(pair.Value), "file", pair.Key));

return multipartContent;

}

}

}