using System;
using System.IO;
using Microsoft.AspNetCore.Antiforgery;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.HealthChecks;
using Newtonsoft.Json.Serialization;
using eShopOnContainers.WebSPA;

namespace eShopConContainers.WebSPA
{
    public class Startup
    {
        private IHostingEnvironment _hostingEnv;
        public Startup(IHostingEnvironment env)
        {
            _hostingEnv = env;

            var builder = new ConfigurationBuilder()
                           .SetBasePath(env.ContentRootPath)
                           .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                           .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                           .AddEnvironmentVariables();

            if (env.IsDevelopment())
            {
                // For more details on using the user secret store see http://go.microsoft.com/fwlink/?LinkID=532709
                builder.AddUserSecrets();
            }

            Configuration = builder.Build();
        }

        public static IConfigurationRoot Configuration { get; set;}
        // 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 http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddHealthChecks(checks =>
            {
                checks.AddUrlCheck(Configuration["CatalogUrl"]);
                checks.AddUrlCheck(Configuration["OrderingUrl"]);
                checks.AddUrlCheck(Configuration["BasketUrl"]);
                checks.AddUrlCheck(Configuration["IdentityUrl"]);
            });

            services.Configure<AppSettings>(Configuration);

            services.AddDataProtection(opts =>
            {
                opts.ApplicationDiscriminator = "eshop.webspa";
            });

            services.AddAntiforgery(options => options.HeaderName = "X-XSRF-TOKEN");

            services.AddMvc()
                .AddJsonOptions(options =>
                {
                    options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                });
        }


        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IAntiforgery antiforgery)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            // Configure XSRF middleware, This pattern is for SPA style applications where XSRF token is added on Index page 
            // load and passed back token on every subsequent async request            
            // app.Use(async (context, next) =>
            // {
            //     if (string.Equals(context.Request.Path.Value, "/", StringComparison.OrdinalIgnoreCase))
            //     {
            //         var tokens = antiforgery.GetAndStoreTokens(context);
            //         context.Response.Cookies.Append("XSRF-TOKEN", tokens.RequestToken, new CookieOptions() { HttpOnly = false });
            //     }
            //     await next.Invoke();
            // });

            app.Use(async (context, next) =>
            {
                await next();

                // If there's no available file and the request doesn't contain an extension, we're probably trying to access a page.
                // Rewrite request to use app root
                if (context.Response.StatusCode == 404 && !Path.HasExtension(context.Request.Path.Value) && !context.Request.Path.Value.StartsWith("/api"))
                {
                    context.Request.Path = "/index.html"; 
                    context.Response.StatusCode = 200; // Make sure we update the status code, otherwise it returns 404
                    await next();
                }
            });

            app.UseDefaultFiles();
            app.UseStaticFiles();
  
            app.UseMvc();
        }
    }
}