using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using MediaBrowser.Controller.Entities;

namespace Emby.Server.Implementations
{
	public class ProxyHttpClientHandler : HttpClientHandler
	{
		public ProxyHttpClientHandler()
		{
			base.ServerCertificateCustomValidationCallback = ((HttpRequestMessage message, X509Certificate2 certificate2, X509Chain arg3, SslPolicyErrors arg4) => true);
			base.UseProxy = true;
		}
		protected override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request, CancellationToken cancellationToken)
        {
            if (!(request.Headers.UserAgent?.Count() > 0))
			{
                request.Headers.UserAgent.ParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36");
            }
			// 获取插件xml配置
			string ProxyType = null;
			string JsProxy = null;
			List<string> JsProxyBypass = null;
			string path = CollectionFolder.ConfigurationManager.ApplicationPaths.PluginConfigurationsPath + "\\EmbyJsProxy.xml";
			if (File.Exists(path))
			{
				XmlTextReader xtr = new XmlTextReader(path);
				while (xtr.Read())
				{
		            if (xtr.NodeType == XmlNodeType.Element)
					{
						string name = xtr.LocalName;
						if (name == "ProxyType")
						{
							ProxyType = xtr.ReadString();
						}
						else if (name == "JsProxy")
						{
							JsProxy = xtr.ReadString();
						}
						else if (name == "JsProxyBypass")
						{
							JsProxyBypass = xtr.ReadString()?.Split(" ,;，；".ToCharArray(), System.StringSplitOptions.RemoveEmptyEntries).Select(o => o.Trim())
						.Distinct().ToList() ?? new List<string>();
						}
				    }
			  
		        }
			    xtr.Close();
			}
			// 初始化
            string url = request.RequestUri.ToString();
            string org_url = url;
			// 如果禁用代理 或 域名不匹配
			if (ProxyType == null || JsProxy == null || JsProxyBypass == null || ProxyType == "-1" || JsProxyBypass?.All(v => url.IndexOf(v, StringComparison.OrdinalIgnoreCase) == -1) == true)
			{
                if (request.Headers.Referrer == null)
				{
                    request.Headers.Referrer = request.RequestUri;
				}
                return base.SendAsync(request, cancellationToken);
			}
			// 否则加上代理
            int i = org_url.IndexOf("/http/", StringComparison.CurrentCultureIgnoreCase);
            if (i > 0)
			{
                org_url = org_url.Substring(i + 6);
			}
            Uri uri_org = new Uri(org_url);
            if (url.StartsWith(JsProxy, StringComparison.OrdinalIgnoreCase) != true)
            {
                url = $"{JsProxy.TrimEnd()}/http/{url}";
                request.RequestUri = new Uri(url);
            }

            url = request.Headers.Referrer?.ToString();
            if (string.IsNullOrWhiteSpace(url))
			{
                request.Headers.Referrer = uri_org;
			}
            return base.SendAsync(request, cancellationToken);
        }
	}
}