Program.cs

using BloodLink.Components;
using BloodLink.IDAL;
using BloodLink.DAL;
using BloodLink.Services;
using BloodLink.Models.Auth;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using Microsoft.AspNetCore.Components.Server;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var razorBuilder = builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();

// Enable detailed errors for Blazor Server circuits (development only)
if (builder.Environment.IsDevelopment())
{
    builder.Services.Configure<Microsoft.AspNetCore.Components.Server.CircuitOptions>(options =>
    {
        options.DetailedErrors = true;
    });
}

// =====================================================
// DATABASE CONNECTION CONFIGURATION
// =====================================================
builder.Services.AddSingleton<IConfiguration>(builder.Configuration);

// =====================================================
// DATA ACCESS LAYER (DAL) REGISTRATION
// =====================================================
// Base DAL
builder.Services.AddScoped<IBaseDAL, BaseDAL>();

// Entity-specific DALs
builder.Services.AddScoped<IUserDAL, UserDAL>();
builder.Services.AddScoped<IDonorDAL, DonorDAL>();
builder.Services.AddScoped<IRecipientDAL, RecipientDAL>();
builder.Services.AddScoped<IBloodBankDAL, BloodBankDAL>();
builder.Services.AddScoped<IBloodRequestDAL, BloodRequestDAL>();
builder.Services.AddScoped<IRequestMatchDAL, RequestMatchDAL>();
builder.Services.AddScoped<IAppointmentDAL, AppointmentDAL>();
builder.Services.AddScoped<IDonationDAL, DonationDAL>();
builder.Services.AddScoped<IDonorAvailabilityDAL, DonorAvailabilityDAL>();
builder.Services.AddScoped<INotificationDAL, NotificationDAL>();
builder.Services.AddScoped<IReviewDAL, ReviewDAL>();
builder.Services.AddScoped<IChatMessageDAL, ChatMessageDAL>();
builder.Services.AddScoped<ISystemAnalyticsDAL, SystemAnalyticsDAL>();
builder.Services.AddScoped<IBloodInventoryDAL, BloodInventoryDAL>();

// =====================================================
// BUSINESS LOGIC SERVICES REGISTRATION
// =====================================================
// Core Services
builder.Services.AddScoped<IUserService, UserService>();
builder.Services.AddScoped<IDonorService, DonorService>();
builder.Services.AddScoped<IRecipientService, RecipientService>();
builder.Services.AddScoped<IBloodBankService, BloodBankService>();
builder.Services.AddScoped<IBloodRequestService, BloodRequestService>();
builder.Services.AddScoped<IAppointmentService, AppointmentService>();
builder.Services.AddScoped<IDonationService, DonationService>();
builder.Services.AddScoped<IReviewService, ReviewService>();
builder.Services.AddScoped<INotificationService, NotificationService>();
builder.Services.AddScoped<IChatMessageService, ChatMessageService>();
builder.Services.AddScoped<ISystemAnalyticsService, SystemAnalyticsService>();
builder.Services.AddScoped<IBloodInventoryService, BloodInventoryService>();
builder.Services.AddScoped<IEmailService, EmailService>();
builder.Services.AddScoped<IFileStorageService, FileStorageService>();
// Service Test Helper (for development/testing)
builder.Services.AddScoped<ServiceTestHelper>();

// =====================================================
// AUTHENTICATION SERVICES REGISTRATION
// =====================================================
// JWT Configuration
builder.Services.Configure<JwtSettings>(builder.Configuration.GetSection("JwtSettings"));

// Authentication Services
builder.Services.AddScoped<IJwtService, JwtService>();
builder.Services.AddScoped<IAuthService, AuthService>();
builder.Services.AddSingleton<UserSessionService>();
builder.Services.AddScoped<AuthStateProvider>();
builder.Services.AddScoped<AuthenticationStateProvider>(provider => provider.GetRequiredService<AuthStateProvider>());

// =====================================================
// ADDITIONAL CONFIGURATION
// =====================================================
// Add logging
builder.Services.AddLogging();

// Add memory cache for better performance
builder.Services.AddMemoryCache();

// Add HTTP context accessor for accessing current user
builder.Services.AddHttpContextAccessor();

// =====================================================
// AUTHENTICATION & AUTHORIZATION (FIXED: Proper JWT configuration)
// =====================================================
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = builder.Configuration["JwtSettings:Issuer"],
            ValidAudience = builder.Configuration["JwtSettings:Audience"],
            IssuerSigningKey = new SymmetricSecurityKey(
                Encoding.UTF8.GetBytes(builder.Configuration["JwtSettings:SecretKey"] ?? ""))
        };
    });

builder.Services.AddAuthorization();

// =====================================================
// FUTURE ENHANCEMENTS (COMMENTED OUT)
// =====================================================
// Uncomment these when implementing API controllers
// builder.Services.AddControllers();

// Uncomment these when implementing SignalR for real-time notifications
// builder.Services.AddSignalR();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();

app.UseStaticFiles();
app.UseAntiforgery();

// Add authentication and authorization middleware
app.UseAuthentication();
app.UseAuthorization();

app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();

app.Run();