using EnvelopeGenerator.Application.Services;
using EnvelopeGenerator.Web.Services;
using Microsoft.EntityFrameworkCore;
using NLog;
using Quartz;
using NLog.Web;
using DigitalData.Core.API;
using Microsoft.AspNetCore.Authentication.Cookies;
using EnvelopeGenerator.Web.Models;
using System.Text.Encodings.Web;
using Ganss.Xss;
using Microsoft.Extensions.Options;
using EnvelopeGenerator.Application;
using DigitalData.EmailProfilerDispatcher;
using EnvelopeGenerator.Infrastructure;
using EnvelopeGenerator.Web.Sanitizers;
using EnvelopeGenerator.Application.Contracts.Services;
using EnvelopeGenerator.Web.Models.Annotation;
using DigitalData.UserManager.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using System;

var logger = LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
logger.Info("Logging initialized!");
try
{
    var builder = WebApplication.CreateBuilder(args);

    builder.Logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);

    if (!builder.Environment.IsDevelopment())
    {
        builder.Logging.ClearProviders();
        builder.Host.UseNLog();
    }

    var config = builder.Configuration;

    var allowedOrigins = config.GetSection("AllowedOrigins").Get<string[]>() ??
        throw new InvalidOperationException("AllowedOrigins section is missing in the configuration.");

    builder.Services.AddCors(options =>
    {
        options.AddPolicy("SameOriginPolicy", builder =>
        {
            builder.WithOrigins(allowedOrigins)
                   .SetIsOriginAllowedToAllowWildcardSubdomains()
                   .AllowCredentials()
                   .AllowAnyMethod()
                   .AllowAnyHeader();
        });
    });

    // Add base services
    builder.Services.AddScoped<DatabaseService>();

    // Add higher order services
    builder.Services.AddScoped<EnvelopeOldService>();

    builder.Services.AddHttpContextAccessor();

    builder.ConfigureBySection<TFARegParams>();

    // Add controllers and razor views
    builder.Services.AddControllersWithViews(options =>
    {
        //remove option for Test*Controller
        options.Conventions.Add(new RemoveIfControllerConvention()
            .AndIf(c => c.ControllerName.StartsWith("Test"))
            .AndIf(_ => !builder.IsDevOrDiP() || !config.GetValue<bool>("EnableTestControllers")));
    }).AddJsonOptions(q =>
    {
        // Prevents serialization error when serializing SvgBitmap in EnvelopeReceiver
        q.JsonSerializerOptions.ReferenceHandler = System.Text.Json.Serialization.ReferenceHandler.IgnoreCycles;
    });

    builder.Services.Configure<CookiePolicyOptions>(options =>
    {
        // This lambda determines whether user consent for non-essential 
        // cookies is needed for a given request.
        options.CheckConsentNeeded = context => true;

        options.MinimumSameSitePolicy = SameSiteMode.None;
    });

    if (config.GetValue<bool>("EnableSwagger") && builder.IsDevOrDiP())
    {
        builder.Services.AddEndpointsApiExplorer();
        builder.Services.AddSwaggerGen();
    }

    //AddEF Core dbcontext
    var connStr = config.GetConnectionString(Key.Default) ?? throw new InvalidOperationException("There is no default connection string in appsettings.json.");

    builder.Services.AddDistributedSqlServerCache(options =>
    {
        options.ConnectionString = connStr;
        options.SchemaName = "dbo";
        options.TableName = "TBDD_CACHE";
    });

    // Add envelope generator services
    builder.Services.AddEnvelopeGeneratorInfrastructureServices((provider, options) =>
    {
        var logger = provider.GetRequiredService<ILogger<EGDbContext>>();
        options.UseSqlServer(connStr)
               .LogTo(log => logger.LogInformation("{log}", log), Microsoft.Extensions.Logging.LogLevel.Trace)
               .EnableSensitiveDataLogging();
    });

    builder.Services.AddEnvelopeGeneratorServices(config);

    builder.Services.Configure<CookiePolicyOptions>(options =>
    {
        options.CheckConsentNeeded = context =>
        {
            var consentCookie = context.Request.Cookies["cookie-consent-settings"];
            return consentCookie != "necessary=false";
        };

        options.MinimumSameSitePolicy = SameSiteMode.Strict;
        options.ConsentCookie.Name = "cookie-consent-settings";
    });

    builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
    .AddCookie(options =>
    {
        options.Cookie.HttpOnly = true;         // Makes the cookie inaccessible to client-side scripts for security
        options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest; // Ensures cookies are sent over HTTPS only
        options.Cookie.SameSite = SameSiteMode.Strict; // Protects against CSRF attacks by restricting how cookies are sent with requests from external sites
        options.ExpireTimeSpan = TimeSpan.FromMinutes(30);

        options.Events = new CookieAuthenticationEvents
        {
            OnRedirectToLogin = context =>
            {
                // Dynamically calculate the redirection path, for example:
                var envelopeReceiverId = context.HttpContext.Request.RouteValues["envelopeReceiverId"];
                context.RedirectUri = $"/EnvelopeKey/{envelopeReceiverId}/Locked";

                context.Response.Redirect(context.RedirectUri);
                return Task.CompletedTask;
            },
            OnRedirectToLogout = context =>
            {
                // Apply a similar redirection logic for logout
                var envelopeReceiverId = context.HttpContext.Request.RouteValues["envelopeReceiverId"];
                context.RedirectUri = $"/EnvelopeKey/{envelopeReceiverId}/Success";

                context.Response.Redirect(context.RedirectUri);
                return Task.CompletedTask;
            }
        }; 
    });

    builder.Services.AddSingleton(config.GetSection("ContactLink").Get<ContactLink>() ?? new());

    builder.Services.AddCookieBasedLocalizer();
    
    builder.Services.AddSingleton(HtmlEncoder.Default);
    builder.Services.AddSingleton(UrlEncoder.Default);
    builder.Services.AddSanitizer<HtmlSanitizer>();
    builder.Services.AddSanitizer<HighlightHtmlSanitizer>(s =>
    {
        s.AllowedTags.Add("a");
        s.AllowedAttributes.Add("href");
        s.AllowedAttributes.Add("class");
        s.AllowedClasses.Add("highlight");
        s.AllowedClasses.Add("highlight-envelope-info-1");
        s.AllowedClasses.Add("highlight-envelope-info-2");
    });

    // Register the FlagIconCssClass instance as a singleton
    builder.Services.Configure<Cultures>(config.GetSection("Cultures"));
    builder.Services.AddSingleton(sp => sp.GetRequiredService<IOptions<Cultures>>().Value);

    // Register mail services
    builder.Services.AddScoped<IEnvelopeMailService, EnvelopeMailService>();
    builder.Services.AddDispatcher<EGDbContext>();

    builder.Services.AddMemoryCache();

    builder.ConfigureBySection<CustomImages>();

    builder.ConfigureBySection<AnnotationParams>();

    builder.Services.AddUserManager<EGDbContext>();

    var app = builder.Build();

    // Configure the HTTP request pipeline.
    if (!app.Environment.IsDevelopment())
    {
        app.UseExceptionHandler("/Home/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();
    }

    //Content-Security-Policy
    if (config.GetValue<bool>("UseCSPInDev") || !app.Environment.IsDevelopment())
    {
        var csp_list = config.GetSection("Content-Security-Policy").Get<string[]>();
        if (csp_list is null)
            logger.Warn("There is no Content-Security-Policy");
        else
        {
            var csp = string.Join("; ", csp_list?.Where(st => st is not null) ?? Array.Empty<string>());
            logger.Info($"Content-Security-Policy {csp}");
            if (csp_list is not null)
                app.UseCSPMiddleware(csp);
        }
    }

    if (config.GetValue<bool>("EnableSwagger") && builder.IsDevOrDiP())
    {
        app.UseSwagger();
        app.UseSwaggerUI();
    }

    app.UseHttpsRedirection();

    app.UseStaticFiles();

    app.UseCookiePolicy();

    app.UseRouting();

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

    var cultures = app.Services.GetRequiredService<Cultures>();
    if(!cultures.Any())
        throw new InvalidOperationException(@"Languages section is missing in the appsettings. Please configure like following.
            Language is both a name of the culture and the name of the resx file such as Resource.de-DE.resx
            FIClass is the css class (in wwwroot/lib/flag-icons-main) for the flag of country.
            ""Cultures"": [
            {
                ""Language"": ""de-DE"",
                ""FIClass"": ""fi-de""
            },
            {
                ""Language"": ""en-US"",
                ""FIClass"": ""fi-us""
            }
            ]");

    if(!config.GetValue<bool>("DisableMultiLanguage"))
        app.UseCookieBasedLocalizer(cultures.Languages.ToArray());

    app.UseCors("SameOriginPolicy");

    app.MapControllers();
    app.MapFallbackToController("Error404", "Home");
    app.Run();
}
catch(Exception ex)
{
    logger.Error(ex, "Stopped program because of exception");
    throw;
}