using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.Json.Serialization;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Hosting;
using Microsoft.IdentityModel.Tokens;
using MyCore.Framework.Models;
using MyCore.Interfaces.Models;
using MyCore.Service;
using MyCore.Services;
using MyCore.Services.MyControlPanel;
using NSwag;
using NSwag.Generation.AspNetCore;
using NSwag.Generation.Processors.Security;
using MyCore.Framework.Business;
using MyCore.Service.Services;
using MQTTnet;
using MQTTnet.AspNetCore;
using MQTTnet.AspNetCore.Extensions;
using MyCore.Service.Extensions;
using Mqtt.Client.AspNetCore.Services;
using Mqtt.Client.AspNetCore.Settings;

namespace MyCore
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;

            //MQTTService mQTTService = new MQTTService();

            //MerossService merossService = new MerossService();

            //ArloService arloService = new ArloService();

            /*YeelightService yeelighService = new YeelightService();
            yeelighService.GetDevices();*/

            MapConfiguration();

        }

        public IConfiguration Configuration { get; }

        private void MapConfiguration()
        {
            MapBrokerHostSettings();
            MapClientSettings();
        }

        private void MapBrokerHostSettings()
        {
            BrokerHostSettings brokerHostSettings = new BrokerHostSettings();
            Configuration.GetSection(nameof(BrokerHostSettings)).Bind(brokerHostSettings);
            AppSettingsProvider.BrokerHostSettings = brokerHostSettings;

            BrokerOnlineHostSettings brokerOnlineHostSettings = new BrokerOnlineHostSettings();
            Configuration.GetSection(nameof(BrokerOnlineHostSettings)).Bind(brokerOnlineHostSettings);
            AppSettingsOnlineProvider.BrokerHostOnlineSettings = brokerOnlineHostSettings;
        }

        private void MapClientSettings()
        {
            ClientSettings clientSettings = new ClientSettings();
            Configuration.GetSection(nameof(ClientSettings)).Bind(clientSettings);
            AppSettingsProvider.ClientSettings = clientSettings;

            ClientOnlineSettings clientOnlineSettings = new ClientOnlineSettings();
            Configuration.GetSection(nameof(ClientOnlineSettings)).Bind(clientOnlineSettings);
            AppSettingsOnlineProvider.ClientOnlineSettings = clientOnlineSettings;
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            //services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

            // Register the Swagger generator, defining 1 or more Swagger documents
            /*services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new Info { Title = "MyCoreApi", Version = "v1" });

                // Set the comments path for the Swagger JSON and UI.
                var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
                var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
                c.IncludeXmlComments(xmlPath);

                c.AddSecurityDefinition("Bearer", new ApiKeyScheme { In = "header", Description = "Please enter JWT with Bearer into field", Name = "Authorization", Type = "apiKey" });
                c.AddSecurityRequirement(new Dictionary<string, IEnumerable<string>> {
                    { "Bearer", Enumerable.Empty<string>() },   
                });

            });

            services.AddAuthentication(options => {
                options.DefaultAuthenticateScheme = "JwtBearer";
                options.DefaultChallengeScheme = "JwtBearer";
            })

            .AddJwtBearer("JwtBearer", jwtBearerOptions =>
            {
                jwtBearerOptions.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuerSigningKey = true,
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("%G2YZ=\tgN7fC9M$FXDt#q*a&]Z")), // Put the secret in a file or something

                    ValidateIssuer = true,
                    ValidIssuer = "MyCore App",

                    ValidateAudience = true,
                    ValidAudience = "Miotecher",

                    ValidateLifetime = true, //validate the expiration and not before values in the token

                    ClockSkew = TimeSpan.FromMinutes(5) //5 minute tolerance for the expiration date
                };
            });*/


            // Swagger

            services.AddControllers()
                    .AddJsonOptions(options =>
                    {
                        options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
                    });

            services.AddOpenApiDocument(config =>
            {
                ConfigureSwagger(config);
            });

            services.AddCors(o => o.AddPolicy("AllowAll", builder =>
            {
                builder.AllowAnyOrigin()
                        .AllowAnyMethod()
                        .AllowAnyHeader();
            }));

            // Authentication

            var tokensConfiguration = Configuration.GetSection("Tokens");
            var tokenSettings = tokensConfiguration.Get<TokensSettings>();

            services.Configure<TokensSettings>(tokensConfiguration);

            foreach (var policy in Security.PoliciesConfiguration)
                services.AddAuthorization(options =>
                {
                    options.AddPolicy(policy.Name, policyAdmin =>
                    {
                        foreach (var claim in policy.Claims)
                            policyAdmin.RequireClaim(Security.ClaimTypes.Permission, claim);
                    });
                });

            services
                .AddAuthentication(x =>
                {
                    x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                    x.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
                    x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
                })
                .AddJwtBearer(x =>
                {
                    x.RequireHttpsMetadata = false;
                    x.SaveToken = true;
                    x.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(tokenSettings.Secret)),
                        ValidateIssuer = false,
                        ValidateAudience = false,
                        RequireExpirationTime = false,
                        ValidateLifetime = true
                    };
                });

            services.AddScoped<TokensService>();
            services.AddScoped(typeof(ProfileLogic));

            services.AddScoped<BookService>();
            services.AddScoped<IoTDeviceService>();
            services.AddScoped<UserDatabaseService>();
            services.AddScoped<ProviderDatabaseService>();
            services.AddScoped<DeviceDatabaseService>();
            services.AddScoped<LocationDatabaseService>();

            services.AddMqttClientHostedService();
            services.AddMqttClientOnlineHostedService();
        }

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

            /*app.UseCors(
                options => options.WithOrigins("http://localhost:4200").AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader().AllowCredentials()
            );*/

            if (env.IsDevelopment())
            {
                //app.UseDeveloperExceptionPage();
                app.UseExceptionHandler(HandleError);
            }

            app.UseHttpsRedirection();

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

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });

            app.UseOpenApi();
            app.UseSwaggerUi3();
        }

        private void ConfigureSwagger(AspNetCoreOpenApiDocumentGeneratorSettings config)
        {
            config.AddSecurity("bearer", Enumerable.Empty<string>(), new OpenApiSecurityScheme
            {
                Type = OpenApiSecuritySchemeType.OAuth2,
                Description = "MyCore Authentication",
                Flow = OpenApiOAuth2Flow.Password,
                Flows = new OpenApiOAuthFlows()
                {

                    Password = new OpenApiOAuthFlow()
                    {
                        Scopes = new Dictionary<string, string>
                                   {
                                        {Security.Scope, "MyCore WebAPI"}
                                   },
                        TokenUrl = "/api/authentication/Token",
                        AuthorizationUrl = "/authentication/Token",
                    }
                }
            });
            config.OperationProcessors.Add(new AspNetCoreOperationSecurityScopeProcessor("bearer"));

            config.PostProcess = document =>
            {
                document.Info.Title = "MyCore Service";
                document.Info.Description = "API description";
                document.Info.Version = "Version Pre-Alpha";
            };

            config.GenerateEnumMappingDescription = true;
        }


        private void HandleError(IApplicationBuilder error)
        {
            error.Run(async context =>
            {
                var exceptionHandlerPathFeature = context.Features.Get<IExceptionHandlerPathFeature>();
                var exception = exceptionHandlerPathFeature?.Error as RequestException;

                if (exception != null)
                {
                    var json = exception.GetJson();
                    context.Response.ContentType = "application/json";
                    context.Response.StatusCode = exception.StatusCode;
                    await context.Response.WriteAsync(json);
                }
            });
        }

        
    }
}