using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using UnityEngine.Networking;
using UnityEngine;
namespace EZXR.Glass.Network.Http
{
	/**
     * \~english
     * Network request tool class(Implement  based on UnityWebRequest @see<https://docs.unity3d.com/Manual/UnityWebRequest.html>)
     * 
     * \~chinese
     * 网络请求工具类（底层基于Unity的UnityWebRequest @see<https://docs.unity3d.com/Manual/UnityWebRequest.html>实现）
     */
    public class HttpClient
    {
        private static readonly HttpClient Instance = new HttpClient();
        private HttpClient()
        {
            
        }

        /**
         * \~english
         * @brief Send asynchronous request
         *
         * @param httpRequest httpRequest
         * 
         * @param responseHandler Callback function returned by request
         * 
         * \~chinese
         * @brief 发送异步请求
         *
         * @param httpRequest httpRequest
         * 
         * @param responseHandler 请求返回的回调函数
         */
		public static void SendRequest(HttpRequest httpRequest, Action<HttpResponse> responseHandler)
        {
			HttpTool.Instance.StartCoroutine (HttpClient.Instance.Send(httpRequest, responseHandler));
        }

        public IEnumerator Send(HttpRequest httpRequest, Action<HttpResponse> onComplete) {
			// Employing `using` will ensure that the UnityWebRequest is properly cleaned in case of uncaught exceptions
			using (var www = new UnityWebRequest (httpRequest.url, httpRequest.method.ToString())) {

				www.timeout = httpRequest.timeout;

				if (httpRequest.requestBody != null) {
					UploadHandler uploader = new UploadHandlerRaw (httpRequest.requestBody.Body ());
					uploader.contentType = httpRequest.requestBody.ContentType ();
					www.uploadHandler = uploader;
				}
					
				if (httpRequest.Headers() != null) {
					foreach (KeyValuePair<string, string> header in httpRequest.Headers()) {
						www.SetRequestHeader (header.Key, header.Value);
					}
				}

				www.downloadHandler = new DownloadHandlerBuffer ();

				yield return www.SendWebRequest ();

				HttpResponse response;
                if (www.isNetworkError || www.isHttpError) {
					response = new HttpResponse(www.error);
				} else {
					response = new HttpResponse(www.responseCode, www.downloadHandler.text);
				}
				
                onComplete(response); 

			}
		}
    }
}