using Microsoft.AspNetCore.Cors;
using Microsoft.Owin;
using Microsoft.Owin.Cors;
using Microsoft.Owin.FileSystems;
using Microsoft.Owin.Hosting;
using Microsoft.Owin.StaticFiles;
using Newtonsoft.Json;
using Owin;
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;

namespace Server
{
    internal class OwinServer
    {

        public static string RootDir = CsharpHttpHelper.HttpExtend.MapPath("网站");// Directory.GetCurrentDirectory() + "\\网站";
        /// <summary>
        /// 查找本地数据，无数据 返回index
        /// </summary>
        /// <param name="relPath"></param>
        /// <returns></returns>
        public static string GetFilePath(string relPath)
        {
            if (string.IsNullOrEmpty(relPath) || relPath == "/")
            {
                relPath = "index.html";
            }

            return Path.Combine(
                AppDomain.CurrentDomain.BaseDirectory
                , RootDir
                , relPath.TrimStart('/').Replace('/', '\\'));
        }

        /// <summary>
        /// 设置返回contenttype  并返回数据
        /// </summary>
        /// <param name="context"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public Task SetResponse(IOwinContext context, string path)
        {
            var perfix = Path.GetExtension(path);
            switch (perfix)
            {
                case ".html":
                    context.Response.ContentType = "text/html; charset=utf-8";
                    break;
                case ".js":
                    context.Response.ContentType = "application/x-javascript";
                    break;
                case ".css":
                    context.Response.ContentType = "text/css";
                    break;
                case ".jpg":
                case ".jpeg":
                    context.Response.ContentType = "image/jpeg";
                    break;
                case ".png":
                    context.Response.ContentType = "application/x-png";
                    break;
                case ".mp4":
                    context.Response.ContentType = "video/mpeg4";
                    break;
                case ".webp":
                    context.Response.ContentType = "image/webp";
                    break;
                case ".gif":
                    context.Response.ContentType = "image/gif";
                    break;
                case ".woff2":
                    context.Response.ContentType = "application/x-font-woff";
                    break;
                case ".ico":
                    context.Response.ContentType = "image/x-icon";
                    break;
            }
            return context.Response.WriteAsync(File.ReadAllText(path));
        }

        /// <summary>
        /// 执行API
        /// </summary>
        /// <param name="context"></param>
        /// <param name="next"></param>
        /// <returns></returns>
        private Task TodoApi(IOwinContext context, Func<Task> next)
        {
            //var response = new WebResult();
            //try
            //{
            //    var query = context.Request.Query.ToString();

            //    //Dictionary<string, string> Param = new Dictionary<string, string>();
            //    //var contentType = context.Request.ContentType;
            //    //if (context.Request.Method.ToLower() == "post")
            //    //{
            //    //    if (contentType.StartsWith("application/x-www-form-urlencoded", StringComparison.OrdinalIgnoreCase))
            //    //    {
            //    //        string body = new StreamReader(context.Request.Body, Encoding.UTF8).ReadToEnd();
            //    //        var postdata =new NameValueCollection(StringComparer.OrdinalIgnoreCase);
            //    //        ///Util.GetQueryString(body, Encoding.UTF8);
            //    //        if (postdata != null)
            //    //        {
            //    //            foreach (var item in postdata.AllKeys)
            //    //            {
            //    //                Param[item] = HttpUtility.UrlEncode(postdata[item]);
            //    //            }
            //    //        }
            //    //    }
            //    //}

            //    //if (context.Request.Query != null && context.Request.Query.Count() > 0)
            //    //{
            //    //    foreach (var item in context.Request.Query)
            //    //    {
            //    //        if (item.Value != null && item.Value.Length > 0) Param[item.Key] = HttpUtility.UrlDecode(item.Value[0]);
            //    //    }
            //    //}

            //    //if (EventClient.StopParsing) return next();
            //    //var plugins = PluginClient.Plugins.ToArray();
            //    //var events = new WebRequestEvents(context, Param, response);
            //    ////正常事件解析
            //    //foreach (var plugin in plugins)
            //    //{
            //    //    if (!plugin.IsRun) continue;//未运行
            //    //    if (events.Cancel) break;//已取消传递
            //    //    plugin.SDK.OnEvent(context, events);
            //    //}
            //}
            //catch (Exception ex)
            //{
            //    response.code = -1;
            //    response.errMsg = ex.Message;
            //}

            //if (string.IsNullOrEmpty(response.))
            //{
            //    response.ok = false;
            //    response.errMsg = $"请求成功,但未响应结果!{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}";
            //}

            //var msg = JsonConvert.SerializeObject(response);
            context.Response.StatusCode = (int)HttpStatusCode.OK;
            return context.Response.WriteAsync("无响应结果");
        }

        /// <summary>
        /// 挂载数据  分流静态文件及接口请求
        /// </summary>
        /// <param name="context"></param>
        /// <param name="next"></param>
        /// <returns></returns>
        public async Task RequestHandler(IOwinContext context, Func<Task> next)
        {
            try
            {
                var path = GetFilePath(context.Request.Path.Value);
                if (File.Exists(path))
                {
                    await SetResponse(context, path);
                }
                else
                {
                    await TodoApi(context, next);
                }
            }
            catch (Exception)
            {
            }
            await next();
        }

        public void Configuration(Owin.IAppBuilder appBuilder)
        {
            appBuilder.UseCors(CorsOptions.AllowAll);
          
            var config = new HttpConfiguration();
            config.MapHttpAttributeRoutes();

            // config.Routes.MapHttpRoute(
            //    name: "DefaultApi",
            //    routeTemplate: "api/{controller}/{id}"
            //);

            config.Routes.MapHttpRoute(
                name: "Default",

                routeTemplate: "{controller}/{action}/{id}",
                defaults: new { controller = "abbb", action = "Index", id = UrlParameter.Optional }
            );

            ///@".\wwwroot"
            var physicalFileSystem = new PhysicalFileSystem(RootDir);
            var options = new FileServerOptions
            {
                EnableDefaultFiles = true,
                FileSystem = physicalFileSystem
            };
           
            options.StaticFileOptions.FileSystem = physicalFileSystem;
            options.StaticFileOptions.ServeUnknownFileTypes = true;
            options.DefaultFilesOptions.DefaultFileNames = new[] { "Index.html" };
            appBuilder.UseFileServer(options);
            appBuilder.UseWebApi(config);
           


            /*
             app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapRazorPages();

app.Run();
             */
        }

    }
}