using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Web.Configuration;
using System.Web.Http;
using System.Web.Http.Dispatcher;
using System.Web.Mvc;
using ClientDependency.Core.CompositeFiles.Providers;
using ClientDependency.Core.Config;
using Umbraco.Core;
using Umbraco.Core.Composing;
using Umbraco.Core.Configuration;
using Umbraco.Core.IO;
using Umbraco.Web.JavaScript;
using Umbraco.Web.Mvc;
using Umbraco.Web.WebApi;

using Current = Umbraco.Web.Composing.Current;

namespace Umbraco.Web.Runtime
{
    public sealed class WebInitialComponent : IComponent
    {
        private readonly IGlobalSettings _globalSettings;

        public WebInitialComponent(IGlobalSettings globalSettings)
        {
            _globalSettings = globalSettings;
        }

        public void Initialize()
        {
            // setup mvc and webapi services
            SetupMvcAndWebApi();

            // When using a non-web runtime and this component is loaded ClientDependency explodes because it'll
            // want to access HttpContext.Current, which doesn't exist
            if (IOHelper.IsHosted)
            {
                ConfigureClientDependency(_globalSettings);
            }

            // Disable the X-AspNetMvc-Version HTTP Header
            MvcHandler.DisableMvcResponseHeader = true;

            // wrap view engines in the profiling engine
            WrapViewEngines(ViewEngines.Engines);

            // add global filters
            ConfigureGlobalFilters();
        }

        public void Terminate()
        { }

        private static void ConfigureGlobalFilters()
        {
            GlobalFilters.Filters.Add(new EnsurePartialViewMacroViewContextFilterAttribute());
        }

        // internal for tests
        internal static void WrapViewEngines(IList<IViewEngine> viewEngines)
        {
            if (viewEngines == null || viewEngines.Count == 0) return;

            var originalEngines = viewEngines.ToList();
            viewEngines.Clear();
            foreach (var engine in originalEngines)
            {
                var wrappedEngine = engine is ProfilingViewEngine ? engine : new ProfilingViewEngine(engine);
                viewEngines.Add(wrappedEngine);
            }
        }

        private static void SetupMvcAndWebApi()
        {
            //don't output the MVC version header (security)
            MvcHandler.DisableMvcResponseHeader = true;

            // set master controller factory
            var controllerFactory = new MasterControllerFactory(() => Current.FilteredControllerFactories);
            ControllerBuilder.Current.SetControllerFactory(controllerFactory);

            // set the render & plugin view engines
            ViewEngines.Engines.Add(new RenderViewEngine());
            ViewEngines.Engines.Add(new PluginViewEngine());

            //set model binder
            ModelBinderProviders.BinderProviders.Add(ContentModelBinder.Instance); // is a provider

            ////add the profiling action filter
            //GlobalFilters.Filters.Add(new ProfilingActionFilter());

            GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerSelector),
                new NamespaceHttpControllerSelector(GlobalConfiguration.Configuration));
        }

        private static void ConfigureClientDependency(IGlobalSettings globalSettings)
        {
            // Backwards compatibility - set the path and URL type for ClientDependency 1.5.1 [LK]
            XmlFileMapper.FileMapDefaultFolder = SystemDirectories.TempData.EnsureEndsWith('/') + "ClientDependency";
            BaseCompositeFileProcessingProvider.UrlTypeDefault = CompositeUrlType.Base64QueryStrings;

            // Now we need to detect if we are running 'Umbraco.Core.LocalTempStorage' as EnvironmentTemp and in that case we want to change the CDF file
            // location to be there
            if (globalSettings.LocalTempStorageLocation == LocalTempStorage.EnvironmentTemp)
            {
                var cachePath = globalSettings.LocalTempPath;

                //set the file map and composite file default location to the %temp% location
                BaseCompositeFileProcessingProvider.CompositeFilePathDefaultFolder
                    = XmlFileMapper.FileMapDefaultFolder
                    = Path.Combine(cachePath, "ClientDependency");
            }

            if (ConfigurationManager.GetSection("system.web/httpRuntime") is HttpRuntimeSection section)
            {
                //set the max url length for CDF to be the smallest of the max query length, max request length
                ClientDependency.Core.CompositeFiles.CompositeDependencyHandler.MaxHandlerUrlLength = Math.Min(section.MaxQueryStringLength, section.MaxRequestLength);
            }

            //Register a custom renderer - used to process property editor dependencies
            var renderer = new DependencyPathRenderer();
            renderer.Initialize("Umbraco.DependencyPathRenderer", new NameValueCollection
            {
                { "compositeFileHandlerPath", ClientDependencySettings.Instance.CompositeFileHandlerPath }
            });

            ClientDependencySettings.Instance.MvcRendererCollection.Add(renderer);
        }
    }
}