using System.Linq;
using System.Text;
using HN.Infrastructure;
using HN.Infrastructure.Identity;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc.Authorization;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Tokens;
using NSwag;
using NSwag.Generation.Processors.Security;

namespace Api
{
  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.AddHN(Configuration).ResolveConnectedUserWith<HttpExecutingUserProvider>();
      services.AddHttpContextAccessor();

      // Permet d'avoir des routes en lowercase
      services.Configure<RouteOptions>(options =>
      {
        options.LowercaseUrls = true;
        options.LowercaseQueryStrings = true;
      });

      // Ajout de l'authentification
      var tokenParams = new TokenValidationParameters
      {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = Configuration["JwtIssuer"],
        ValidAudience = Configuration["JwtAudience"],
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["JwtSecurityKey"]))
      };

      services.AddSingleton(tokenParams);

      services.AddIdentityCore<User>()
        .AddRoles<Role>()
        .AddEntityFrameworkStores<HNDbContext>()
        .AddSignInManager();

      services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
        .AddJwtBearer(o =>
        {
          o.TokenValidationParameters = tokenParams;
        });

      services.AddControllers(o =>
      {
        o.Filters.Add(new AuthorizeFilter());
      });

      services.AddSwaggerDocument(d =>
      {
        // cf. https://github.com/RicoSuter/NSwag/wiki/AspNetCore-Middleware#enable-authentication-in-generator-and-swagger-ui

        // Ajoute un type de sécurité à tout le document
        d.AddSecurity("JWT", Enumerable.Empty<string>(), new OpenApiSecurityScheme()
        {
          Type = OpenApiSecuritySchemeType.ApiKey,
          Name = "Authorization",
          In = OpenApiSecurityApiKeyLocation.Header,
          Description = "Type into the textbox: Bearer {your JWT token}."
        });

        // d.DocumentProcessors.Add(new SecurityDefinitionAppender("JWT", new OpenApiSecurityScheme
        // {
        //   Type = OpenApiSecuritySchemeType.ApiKey,
        //   Name = "Authorization",
        //   In = OpenApiSecurityApiKeyLocation.Header,
        //   Description = "Type into the textbox: Bearer {your JWT token}."
        // }));

        // Permet la génération des info de sécurité par réflexion (attribut Authorize)
        // Fonctionne mal avec les filtres par défaut ...
        d.OperationProcessors.Add(new AspNetCoreOperationSecurityScopeProcessor("JWT"));

        d.PostProcess = od =>
        {
          od.Info.Title = "Hacker news like API in .Net";
        };

        d.SchemaType = NJsonSchema.SchemaType.OpenApi3;
      });
    }

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

      if (env.IsDevelopment())
      {
        app.UseDeveloperExceptionPage();
        app.UseSwaggerUi3();
      }

      app.UseRouting();

      app.UseAuthentication();
      app.UseAuthorization();

      app.UseEndpoints(endpoints =>
      {
        endpoints.MapControllers();
        endpoints.MapGet("/", async context =>
              {
                await context.Response.WriteAsync("Hello World!");
              });
      });
    }
  }
}