using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using Webshop.Application.Services.Public; 
using Webshop.Application.Services.Auth;   
using Webshop.Application.Services.Admin;   
using Webshop.Domain.Interfaces;
using Webshop.Infrastructure.Data;
using Webshop.Infrastructure.Repositories;
using Microsoft.AspNetCore.HttpOverrides; 
using Microsoft.Extensions.Logging; 

var builder = WebApplication.CreateBuilder(args);

// --- START: DIENSTE ZUM CONTAINER HINZUFÜGEN ---

// 1. Datenbank-Kontext (DbContext) registrieren
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection"))
);

// 2. ASP.NET Core Identity für Benutzerverwaltung registrieren
builder.Services.AddIdentity<IdentityUser, IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();

// 3. JWT-Authentifizierung konfigurieren
var jwtSettings = builder.Configuration.GetSection("JwtSettings");
var secretKey = jwtSettings["Secret"] ?? throw new InvalidOperationException("JWT Secret not found in configuration.");

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 = jwtSettings["Issuer"],
        ValidAudience = jwtSettings["Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(secretKey))
    };
});
builder.Services.AddAuthorization(); // Aktiviert die Autorisierung

// 4. Unsere eigenen Interfaces und Klassen registrieren (Dependency Injection)
builder.Services.AddScoped<IProductRepository, ProductRepository>();

// AUTH Services
builder.Services.AddScoped<IAuthService, AuthService>();

// PUBLIC Services
builder.Services.AddScoped<ProductService>(); // Ihr ProductService ist hier registriert

// ADMIN Services
builder.Services.AddScoped<AdminUserService>();
builder.Services.AddScoped<AdminProductService>();

// CUSTOMER Services (später Implementierungen hinzufügen)
// builder.Services.AddScoped<CustomerOrderService>();


// 5. Controller und Swagger/OpenAPI hinzufügen
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// --- ENDE: DIENSTE ZUM CONTAINER HINZUFÜGEN ---

var app = builder.Build();

// Optional: Automatisches Anwenden von Migrationen beim Start (nur für Entwicklung/Tests)
using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var context = services.GetRequiredService<ApplicationDbContext>();
        context.Database.Migrate(); // Wendet ausstehende Migrationen an
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred while migrating the database.");
    }
}

// --- START: HTTP REQUEST PIPELINE KONFIGURIEREN ---

app.UseForwardedHeaders(new ForwardedHeadersOptions
{
    ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
});

// Swagger immer aktivieren (auch in Produktion für API-Dokumentation)
// Für die Produktion wäre es sicherer, dies an `app.Environment.IsDevelopment()` zu binden
// if (app.Environment.IsDevelopment())
// {
app.UseSwagger();
app.UseSwaggerUI();
// }

// app.UseHttpsRedirection(); // Auskommentiert für Docker HTTP-Entwicklung

// WICHTIG: Die Reihenfolge ist entscheidend!
app.UseAuthentication();
app.UseAuthorization();

app.MapControllers();

// --- ENDE: HTTP REQUEST PIPELINE KONFIGURIEREN ---

app.Run();

// --- TEMPORÄRER INITIALER ADMIN- UND KUNDEN-SETUP (NUR FÜR ERSTE ENTWICKLUNG!) ---
// Dieser Block erstellt Rollen und initiale Benutzer, falls sie noch nicht existieren.
// Entfernen oder kommentiere dies aus, NACHDEM du deine ersten Benutzer erstellt hast!
using (var scope = app.Services.CreateScope()) // Eigener Scope, da app.Run() blockierend ist
{
    var serviceProvider = scope.ServiceProvider;
    var roleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
    var userManager = serviceProvider.GetRequiredService<UserManager<IdentityUser>>();

    string[] roleNames = { "Admin", "Customer" };

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

    // Erstelle einen initialen Admin-Benutzer
    var adminUser = await userManager.FindByEmailAsync("admin@yourwebshop.com"); // << ANPASSEN >>
    if (adminUser == null)
    {
        adminUser = new IdentityUser
        {
            UserName = "admin@yourwebshop.com", // << ANPASSEN >>
            Email = "admin@yourwebshop.com",    // << ANPASSEN >>
            EmailConfirmed = true
        };
        var createAdmin = await userManager.CreateAsync(adminUser, "SecureAdminPass123!"); // << ANPASSEN >>
        if (createAdmin.Succeeded)
        {
            await userManager.AddToRoleAsync(adminUser, "Admin");
            Console.WriteLine("Admin user created.");
        }
        else
        {
            Console.WriteLine($"Error creating admin user: {string.Join(", ", createAdmin.Errors.Select(e => e.Description))}");
        }
    }

    // Erstelle einen initialen Kunden-Benutzer
    var customerUser = await userManager.FindByEmailAsync("customer@yourwebshop.com"); // << ANPASSEN >>
    if (customerUser == null)
    {
        customerUser = new IdentityUser
        {
            UserName = "customer@yourwebshop.com", // << ANPASSEN >>
            Email = "customer@yourwebshop.com",    // << ANPASSEN >>
            EmailConfirmed = true
        };
        var createCustomer = await userManager.CreateAsync(customerUser, "SecureCustomerPass123!"); // << ANPASSEN >>
        if (createCustomer.Succeeded)
        {
            await userManager.AddToRoleAsync(customerUser, "Customer");
            Console.WriteLine("Customer user created.");
        }
        else
        {
            Console.WriteLine($"Error creating customer user: {string.Join(", ", createCustomer.Errors.Select(e => e.Description))}");
        }
    }
}
// --- ENDE DES TEMPORÄREN SETUP-BLOCKS ---