using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Protocols.OpenIdConnect;
using Microsoft.IdentityModel.Tokens;
using Web.Data;

namespace Web
{
    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.AddRazorPages();
            services.AddServerSideBlazor();
            services.AddHttpContextAccessor();
            services.AddAuthentication(options =>
                {
                    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                    options.DefaultChallengeScheme = "oidc";
                })
                .AddCookie(CookieAuthenticationDefaults.AuthenticationScheme)
                .AddOpenIdConnect(options =>
                {
                    options.Authority = Configuration["oidc:authority"];
                    options.ClientId = Configuration["oidc:client_id"];
                    options.ClientSecret = Configuration["oidc:client_secret"];

                    options.ResponseType = OpenIdConnectResponseType.Code;
                    options.GetClaimsFromUserInfoEndpoint = true;
                    options.SaveTokens = true;
                    options.Scope.Add("openid");
                    options.Scope.Add("profile");
                    options.Scope.Add("email");
                    options.TokenValidationParameters = new 
                        TokenValidationParameters
                        {
                            NameClaimType = "name"
                        };
                    options.Events = new OpenIdConnectEvents
                    {
                        OnAccessDenied = context =>
                        {
                            context.HandleResponse();
                            context.Response.Redirect("/");
                            return Task.CompletedTask;
                        }
                    };
                });
        }

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

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

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");
            });
        }
    }
}