Program.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;
using web_programming_project_2025_bthnozdemir.Models;

var builder = WebApplication.CreateBuilder(args);

// SQLite Veritabanı Bağlantısı
builder.Services.AddDbContext<Context>(options =>
    options.UseSqlite(builder.Configuration.GetConnectionString("DefaultConnection")));

// FILE UPLOAD LİMİTİ - RESİM SORUNUNU ÇÖZER (10MB)
builder.Services.Configure<Microsoft.AspNetCore.Http.Features.FormOptions>(options =>
{
    options.MultipartBodyLengthLimit = 10 * 1024 * 1024; // 10MB limit
});

// Identity Yapılandırması (Kullanıcı & Rol) ASP.NET Core Identitiy
// Uygulama ayağa kalkarken Admin ve User rolleri seed ediliyor, admin kullanıcı otomatik oluşturuluyor.
builder.Services.AddIdentity<ApplicationUser, IdentityRole>(options => 
    {
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
        options.Password.RequiredLength = 3;
    })
    .AddEntityFrameworkStores<Context>()
    .AddDefaultTokenProviders();

// Çerez ve Erişim Yönlendirmeleri
builder.Services.ConfigureApplicationCookie(options =>
{
    options.LoginPath = "/Account/Login";
    options.LogoutPath = "/Account/Logout";
    options.AccessDeniedPath = "/Account/AccessDenied";
});

// Servis Enjeksiyonları (Dependency Injection)
// İş mantığını Controller'den ayırmak için yazdığımız Service katmanını sisteme dahil ediyoruz.
builder.Services.AddScoped<web_programming_project_2025_bthnozdemir.Services.CurrencyService>();
builder.Services.AddScoped<web_programming_project_2025_bthnozdemir.Services.ProductService>();
builder.Services.AddScoped<web_programming_project_2025_bthnozdemir.Services.CategoryService>();

builder.Services.AddControllersWithViews();

var app = builder.Build();

// Başlangıç Verileri ve Admin Hesabı Tanımlama
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var userManager = services.GetRequiredService<UserManager<ApplicationUser>>();
        var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>();

        // Roller
        if (!await roleManager.RoleExistsAsync("Admin")) await roleManager.CreateAsync(new IdentityRole("Admin"));
        if (!await roleManager.RoleExistsAsync("User")) await roleManager.CreateAsync(new IdentityRole("User"));

        // Admin Kullanıcısı
        var adminEmail = "b231200372@ogr.sakarya.edu.tr"; 
        var adminUser = await userManager.FindByEmailAsync(adminEmail);
        
        if (adminUser == null)
        {
            adminUser = new ApplicationUser 
            { 
                UserName = adminEmail, 
                Email = adminEmail, 
                EmailConfirmed = true,
                FirstName = "Batuhan",
                LastName = "Özdemir"
            };
            
            var result = await userManager.CreateAsync(adminUser, "bsm"); 
            if (result.Succeeded)
            {
                await userManager.AddToRoleAsync(adminUser, "Admin");
            }
        }
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "Seed Data yüklenirken hata oluştu.");
    }
}

// HTTP İstek Hattı (Middleware)
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

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

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();