using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.ResponseCompression;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System.Linq;
using System;
using Microsoft.Extensions.Primitives;
using System.Buffers;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.DataProtection.Repositories;
using System.Collections.Generic;
using Microsoft.AspNetCore.Razor.Language;
using Blog3000.Server.MiddleWares;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.HttpOverrides;
using AspNetCoreRateLimit;
using Blog3000.Server.Controllers;
using Microsoft.AspNetCore.Mvc;

namespace Blog3000.Server
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddOptions(); // Read from appsettings.json, ForRateLimit
            services.AddControllersWithViews();
            services.AddMemoryCache(); // For BlogPostRepo, RateLimit
            services.AddDataProtection(); // ASP.Net-Core variant of DPAPI

            // Next block sole for IP-Rate-Limiter    

            //load rules from appsettings.json
            services.Configure<IpRateLimitOptions>(Configuration.GetSection("IpRateLimiting"));
            services.Configure<IpRateLimitPolicies>(Configuration.GetSection("IpRateLimitPolicies"));
            // inject counter and rules stores
            services.AddSingleton<IIpPolicyStore, MemoryCacheIpPolicyStore>();
            services.AddSingleton<IRateLimitCounterStore, MemoryCacheRateLimitCounterStore>();
            // https://github.com/aspnet/Hosting/issues/793
            // the IHttpContextAccessor service is not registered by default.
            // the clientId/clientIp resolvers use it.
            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
            // configuration (resolvers, counter key builders)
            services.AddSingleton<IRateLimitConfiguration, RateLimitConfiguration>();


            // Now add own services

            services.AddSingleton(typeof(BlogEnv));
            services.AddSingleton(typeof(BlogPostRepo));
            services.AddHostedService<BlogPostRepoUpdater>();
            services.AddHostedService<UpdateTweeter>();
            services.AddSingleton<SEOMgr>();
            services.AddSingleton(typeof(SearchBotHandler));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {

            app.UseIpRateLimiting();


            app.UseForwardedHeaders(new ForwardedHeadersOptions
            {
                //ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
                ForwardedHeaders = ForwardedHeaders.All
            });


            // Add our custom headers
            app.Use(async (context, next) =>
            {
                // ForwardedHeaders won't set this even for X-Forward-For: https//... ?
                // (because of proxied to http://localhost ??)                
                // Therefore force to true now. So it won't break url-generation in sitemap etc..
                // Perhaps make this configurable like "--publicUrl=...."
                context.Request.IsHttps = true;


                context.Response.Headers.Add("X-Blog3000-Build", Blog3000.Server.BuildVersion.BUILD_DATE);
                await next.Invoke();
            });


            // No Cache
            var cp = new NoCacheHeaderAdder(new string[] { "/robots.txt", "/config.json", "/manifest.json", "/favicon.ico" });
            app.Use(async (context, next) =>
            {
                cp.Process(context);
                await next.Invoke();
            });


            // Handle SearchBot requests
            app.Use(async (context, next) =>
            {

                var sbh = context.RequestServices.GetService<SearchBotHandler>();
                var res = await sbh.Process(context);
                if (res) return; // Request completly handling by SEO

                await next.Invoke();
            });

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseWebAssemblyDebugging();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                // app.UseHsts();
            }


            //app.UseHttpsRedirection();
            app.UseBlazorFrameworkFiles();            
            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                        name: "config",
                        pattern: "/config.json",
                        defaults: new { controller = "Config", action = "Get" }
                        );
                endpoints.MapControllers();
                endpoints.MapFallbackToFile("index.html");
            });

            app.UseStaticFiles();


        }
    }
}