Program.cs

using BookLibrarySystem.Data;
using BookLibrarySystem.Repositories;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.StackExchangeRedis;
using Microsoft.Extensions.Diagnostics.HealthChecks;
using Serilog;
using System.IO;

// Configure Serilog
Log.Logger = new LoggerConfiguration()
    .WriteTo.Console()
    .Enrich.FromLogContext()
    .CreateLogger();

var builder = WebApplication.CreateBuilder(args);

// Use Serilog as the logging provider
builder.Host.UseSerilog();

// Add services to the container
builder.Services.AddControllersWithViews(); // For MVC with views
builder.Services.AddScoped<IBookRepository, BookRepository>();
builder.Services.AddScoped<BookLibrarySystem.Filters.ActionLoggingFilter>();
builder.Services.AddResponseCaching();
builder.Services.AddMemoryCache();
builder.Services.AddStackExchangeRedisCache(options =>
{
    options.Configuration = "localhost:6379";
    options.InstanceName = "BookLibrary_";
});
builder.Services.AddHealthChecks();

// Configure DbContext
builder.Services.AddDbContext<BookLibraryContext>(options =>
    options.UseSqlite(builder.Configuration.GetConnectionString("DefaultConnection")));

// Add Swagger
var xmlFile = $"{System.Reflection.Assembly.GetExecutingAssembly().GetName().Name}.xml";
var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
builder.Services.AddSwaggerGen(options =>
{
    options.IncludeXmlComments(xmlPath);
});

var app = builder.Build();

// Configure the HTTP request pipeline
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
else
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles(); // For serving static files like CSS/JS

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

// Use custom request logging middleware
app.UseMiddleware<BookLibrarySystem.Middleware.RequestLoggingMiddleware>();

// Use response caching middleware
app.UseResponseCaching();

// Map default route for MVC
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Books}/{action=Index}/{id?}");

// Map health check endpoint
app.MapHealthChecks("/health");

// Initialize the database
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var context = services.GetRequiredService<BookLibraryContext>();
        DbInitializer.Initialize(context);
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred while seeding the database.");
    }
}

app.Run();

// Ensure to flush and stop Serilog on shutdown
Log.CloseAndFlush();