Program.cs

using Asp.Versioning;
using Asp.Versioning.ApiExplorer;
using AspNetCoreRateLimit;
using SolrNet;
using Prometheus;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using System.Text;
using TrendLine.Data;
using TrendLine.GraphQL;
using TrendLine.GraphQL.Types;
using TrendLine.LinksResolvers;
using TrendLine.Mapping;
using TrendLine.Models;
using TrendLine.Repositories.Implementations;
using TrendLine.Repositories.Interfaces;
using TrendLine.Services.AuthenticationService;
using TrendLine.Services.Implementations;
using TrendLine.Services.Interfaces;
using TrendLine.Services.Utilities;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllers();

// Configure API Versioning
builder.Services.AddApiVersioning(options =>
{
    options.DefaultApiVersion = new ApiVersion(1, 0);
    options.AssumeDefaultVersionWhenUnspecified = true;
    options.ReportApiVersions = true;
})
.AddMvc()
.AddApiExplorer(options =>
{
    options.GroupNameFormat = "'v'VVV";
    options.SubstituteApiVersionInUrl = true;
});

// Configure Swagger for API versioning and JWT
builder.Services.AddSwaggerGen(options =>
{
    options.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        In = ParameterLocation.Header,
        Description = "Please enter a valid token",
        Name = "Authorization",
        Type = SecuritySchemeType.Http,
        BearerFormat = "JWT",
        Scheme = "Bearer"
    });
    var xmlFile = $"{System.Reflection.Assembly.GetExecutingAssembly().GetName().Name}.xml";
    var xmlPath = System.IO.Path.Combine(AppContext.BaseDirectory, xmlFile);
    options.IncludeXmlComments(xmlPath);

    options.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                }
            },
            new string[] {}
        }
    });

    var provider = builder.Services.BuildServiceProvider()
                                   .GetRequiredService<IApiVersionDescriptionProvider>();

    foreach (var description in provider.ApiVersionDescriptions)
    {
        options.SwaggerDoc(description.GroupName, new OpenApiInfo
        {
            Title = $"Demo API {description.ApiVersion}",
            Version = description.GroupName,
            Description = description.IsDeprecated
                ? "This version is deprecated."
                : "Active version."
        });
    }
});

// Configure Entity Framework and ApplicationDbContext
builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));

// Configure ASP.NET Identity
builder.Services.AddIdentity<ApplicationUser, IdentityRole>()
    .AddEntityFrameworkStores<AppDbContext>()
    .AddDefaultTokenProviders();

// Configure Authentication
builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = "MyIssuer",
        ValidAudience = "MyAudience",
        IssuerSigningKey = new SymmetricSecurityKey(
            Encoding.ASCII.GetBytes("Mmx44IfURe84A/c4i0g2eY8m/DEhzUzXyyVPwKIo2SU="))
    };
});

// Register Repositories and Services
builder.Services.AddScoped<IProductRepository, ProductRepository>();
builder.Services.AddScoped<IOrderRepository, OrderRepository>();
builder.Services.AddScoped<ICatalogRepository, CatalogRepository>();
builder.Services.AddScoped<ICustomerRepository, CustomerRepository>();
builder.Services.AddScoped<IDiscountRepository, DiscountRepository>();
builder.Services.AddScoped<IProductService, ProductService>();
builder.Services.AddScoped<IOrderService, OrderService>();
builder.Services.AddScoped<ICatalogService, CatalogService>();
builder.Services.AddScoped<IReportService, ReportService>();
builder.Services.AddScoped<ICustomerService, CustomerService>();
builder.Services.AddScoped<IDiscountService, DiscountService>();
builder.Services.AddScoped<TokenService>();
builder.Services.AddScoped<Query>();
builder.Services.AddScoped<Mutation>();
builder.Services.AddScoped<LinkHelper>();
builder.Services.AddHttpContextAccessor();
builder.Services.AddScoped<ProductLinksResolver>();
builder.Services.AddScoped<OrderLinksResolver>();
builder.Services.AddSolrNet<Product>("http://solr:8983/solr/clothing_shop_core");
builder.Services.AddScoped<SolrProductService>();

// GraphQL Setup
builder.Services.AddGraphQLServer()
    .AddErrorFilter<GraphQLErrorFilter>()
    .AddQueryType<Query>()
    .AddType<OrderType>()
    .AddType<CustomerType>()
    .AddMutationType<Mutation>()
    .AddType<ProductType>()
    .AddSubscriptionType<Subscription>()
    .AddProjections()
    .AddFiltering()
    .AddSorting()
    .ModifyRequestOptions(options => options.IncludeExceptionDetails = true)
    .AddInMemorySubscriptions();

// Rate Limiting Configuration
builder.Services.AddOptions();
builder.Services.AddMemoryCache();
builder.Services.Configure<IpRateLimitOptions>(builder.Configuration.GetSection("IpRateLimiting"));
builder.Services.AddInMemoryRateLimiting();
builder.Services.AddSingleton<IRateLimitConfiguration, RateLimitConfiguration>();

builder.Services.AddMemoryCache();

builder.Services.AddAutoMapper(cfg =>
{
    cfg.AddProfile<MappingProfile>();
});

builder.Services.AddSingleton(provider => provider.GetRequiredService<IConfigurationProvider>());

builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(builder =>
    {
        builder.WithOrigins("http://localhost:3000")
               .AllowAnyHeader()
               .AllowAnyMethod()
               .AllowCredentials();
    });
});

var app = builder.Build();

// Add this block for database migration
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var context = services.GetRequiredService<AppDbContext>();
        await context.Database.MigrateAsync();

        // After migration is complete, then create roles
        var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>();
        string[] roles = new[] { "Admin", "Advanced User", "Simple User", "Customer" };

        foreach (var roleName in roles)
        {
            if (!await roleManager.RoleExistsAsync(roleName))
            {
                await roleManager.CreateAsync(new IdentityRole(roleName));
            }
        }
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred while migrating the database or seeding roles.");
        throw;
    }
}

using (var scope = app.Services.CreateScope())
{
    var roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();
    string[] roles = new[] { "Admin", "Advanced User", "Simple User", "Customer" };

    foreach (var roleName in roles)
    {
        if (!await roleManager.RoleExistsAsync(roleName))
        {
            await roleManager.CreateAsync(new IdentityRole(roleName));
        }
    }
}

using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    var context = services.GetRequiredService<AppDbContext>();

    try
    {
        await SeedData.SeedAsync(context);
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred while seeding the database.");
        throw;
    }
}

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI(options =>
    {
        var provider = app.Services.GetRequiredService<IApiVersionDescriptionProvider>();

        foreach (var description in provider.ApiVersionDescriptions)
        {
            options.SwaggerEndpoint(
                $"/swagger/{description.GroupName}/swagger.json",
                description.GroupName.ToUpperInvariant());
        }
    });
}

app.UseCors();
app.UseHttpsRedirection();
app.UseAuthentication();
app.UseAuthorization();
app.UseIpRateLimiting();
app.UseWebSockets();
app.MapGraphQL();
app.MapControllers();
app.MapGet("/health", () => Results.Ok("Healthy"))
   .WithName("HealthCheck")
   .WithOpenApi();
app.UseMetricServer();
app.UseHttpMetrics();

app.Run();