using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Owin.Hosting;
using NLog;
using NzbDrone.Common.EnvironmentInfo;
using NzbDrone.Common.Security;
using NzbDrone.Core.Configuration;
using NzbDrone.Host.AccessControl;
using NzbDrone.Host.Owin.MiddleWare;
using Owin;

namespace NzbDrone.Host.Owin
{
    public class OwinHostController : IHostController
    {
        private readonly IConfigFileProvider _configFileProvider;
        private readonly IEnumerable<IOwinMiddleWare> _owinMiddleWares;
        private readonly IRuntimeInfo _runtimeInfo;
        private readonly IUrlAclAdapter _urlAclAdapter;
        private readonly IFirewallAdapter _firewallAdapter;
        private readonly Logger _logger;
        private IDisposable _host;

        public OwinHostController(IConfigFileProvider configFileProvider, IEnumerable<IOwinMiddleWare> owinMiddleWares,
            IRuntimeInfo runtimeInfo, IUrlAclAdapter urlAclAdapter, IFirewallAdapter firewallAdapter, Logger logger)
        {
            _configFileProvider = configFileProvider;
            _owinMiddleWares = owinMiddleWares;
            _runtimeInfo = runtimeInfo;
            _urlAclAdapter = urlAclAdapter;
            _firewallAdapter = firewallAdapter;
            _logger = logger;
        }

        public void StartServer()
        {
            IgnoreCertErrorPolicy.Register();

            if (OsInfo.IsWindows && _runtimeInfo.IsAdmin)
            {
                _urlAclAdapter.RefreshRegistration();
                _firewallAdapter.MakeAccessible();
            }

            var options = new StartOptions(_urlAclAdapter.UrlAcl)
                {
                    ServerFactory = "Microsoft.Owin.Host.HttpListener"
                };

            _logger.Info("starting server on {0}", _urlAclAdapter.UrlAcl);

            _host = WebApp.Start(OwinServiceProviderFactory.Create(), options, BuildApp);
        }

        private void BuildApp(IAppBuilder appBuilder)
        {
            appBuilder.Properties["host.AppName"] = "NzbDrone";

            foreach (var middleWare in _owinMiddleWares.OrderBy(c => c.Order))
            {
                _logger.Debug("Attaching {0} to host", middleWare.GetType().Name);
                middleWare.Attach(appBuilder);
            }
        }

        public string AppUrl
        {
            get { return string.Format("http://localhost:{0}", _configFileProvider.Port); }
        }

        public void StopServer()
        {
            if (_host == null) return;

            _logger.Info("Attempting to stop Nancy host");
            _host.Dispose();
            _host = null;
            _logger.Info("Host has stopped");
        }

    }
}