using AutoBidder.Services;
using AutoBidder.Data;
using AutoBidder.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.DataProtection;
using System.Data.Common;

var builder = WebApplication.CreateBuilder(args);

// FORCE ASPNETCORE_URLS to prevent any override
// Questo garantisce che il container ascolti SEMPRE sulla porta configurata
if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable("ASPNETCORE_URLS")))
{
    builder.WebHost.UseUrls("http://+:8080");
}
else
{
    builder.WebHost.UseUrls(Environment.GetEnvironmentVariable("ASPNETCORE_URLS")!);
}

// Configura Kestrel solo per HTTPS opzionale
// HTTP è gestito da ASPNETCORE_URLS (default: http://+:8080 nel Dockerfile)
var enableHttps = builder.Configuration.GetValue<bool>("Kestrel:EnableHttps", false);

if (enableHttps)
{
    builder.WebHost.ConfigureKestrel(options =>
    {
        try
        {
            // In produzione, cerca il certificato da configurazione
            var certPath = builder.Configuration["Kestrel:Certificates:Default:Path"];
            var certPassword = builder.Configuration["Kestrel:Certificates:Default:Password"];
            
            if (!string.IsNullOrEmpty(certPath) && File.Exists(certPath))
            {
                options.ListenAnyIP(8443, listenOptions =>
                {
                    listenOptions.UseHttps(certPath, certPassword);
                    Console.WriteLine($"[Kestrel] HTTPS enabled with certificate: {certPath}");
                });
            }
            else if (builder.Environment.IsDevelopment())
            {
                // Certificato di sviluppo SOLO in ambiente Development
                options.ListenAnyIP(5001, listenOptions =>
                {
                    listenOptions.UseHttps();
                    Console.WriteLine("[Kestrel] HTTPS enabled with development certificate");
                });
            }
            else
            {
                Console.WriteLine("[Kestrel] HTTPS requested but no certificate found");
                Console.WriteLine("[Kestrel] Running in HTTP-only mode");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[Kestrel] Failed to enable HTTPS: {ex.Message}");
            Console.WriteLine("[Kestrel] Running in HTTP-only mode");
        }
    });
}
else
{
    Console.WriteLine("[Kestrel] HTTPS disabled - running in HTTP-only mode");
    Console.WriteLine("[Kestrel] Use a reverse proxy (nginx/traefik) for SSL termination");
    Console.WriteLine($"[Kestrel] Listening on: {Environment.GetEnvironmentVariable("ASPNETCORE_URLS") ?? "http://+:8080"}");
}

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

// Configura Data Protection per evitare CryptographicException
var dataProtectionPath = Path.Combine(
    Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
    "AutoBidder",
    "DataProtection-Keys"
);

if (!Directory.Exists(dataProtectionPath))
{
    Directory.CreateDirectory(dataProtectionPath);
}

builder.Services.AddDataProtection()
    .PersistKeysToFileSystem(new DirectoryInfo(dataProtectionPath))
    .SetApplicationName("AutoBidder");

// ============================================
// CONFIGURAZIONE AUTENTICAZIONE E SICUREZZA
// ============================================

// Database per Identity (SQLite)
var identityDbPath = Path.Combine(
    Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
    "AutoBidder",
    "identity.db"
);

builder.Services.AddDbContext<ApplicationDbContext>(options =>
{
    options.UseSqlite($"Data Source={identityDbPath}");
});

// ASP.NET Core Identity
builder.Services.AddIdentity<ApplicationUser, IdentityRole>(options =>
{
    // Password settings (SICUREZZA FORTE)
    options.Password.RequireDigit = true;
    options.Password.RequireLowercase = true;
    options.Password.RequireUppercase = true;
    options.Password.RequireNonAlphanumeric = true;
    options.Password.RequiredLength = 12;
    options.Password.RequiredUniqueChars = 4;

    // Lockout settings (protezione brute-force)
    options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(15);
    options.Lockout.MaxFailedAccessAttempts = 5;
    options.Lockout.AllowedForNewUsers = true;

    // User settings
    options.User.RequireUniqueEmail = false;
    options.SignIn.RequireConfirmedAccount = false;
})
.AddEntityFrameworkStores<ApplicationDbContext>()
.AddDefaultTokenProviders();

// Cookie configuration (SICUREZZA TAILSCALE)
builder.Services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Name = "AutoBidder.Auth";
    options.Cookie.HttpOnly = true;
    options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest; // HTTP su Tailscale OK
    options.Cookie.SameSite = SameSiteMode.Lax;
    options.ExpireTimeSpan = TimeSpan.FromDays(7);
    options.SlidingExpiration = true;
    
    // Redirect per autenticazione (Razor Pages)
    options.LoginPath = "/Account/Login";
    options.LogoutPath = "/Account/Logout";
    options.AccessDeniedPath = "/Account/Login";
});

// Authorization
builder.Services.AddAuthorization();
builder.Services.AddCascadingAuthenticationState();

// Configura HTTPS Redirection per produzione
if (!builder.Environment.IsDevelopment())
{
    builder.Services.AddHsts(options =>
    {
        options.MaxAge = TimeSpan.FromDays(365);
        options.IncludeSubDomains = true;
        options.Preload = true;
    });
}

// Configura Database SQLite per statistiche (fallback locale)
builder.Services.AddDbContext<StatisticsContext>(options =>
{
    var dbPath = Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
        "AutoBidder",
        "statistics.db"
    );
    
    // Crea directory se non esiste
    var directory = Path.GetDirectoryName(dbPath);
    if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
    {
        Directory.CreateDirectory(directory);
    }
    
    options.UseSqlite($"Data Source={dbPath}");
});

// Configura Database PostgreSQL per statistiche avanzate
var usePostgres = builder.Configuration.GetValue<bool>("Database:UsePostgres", false);
if (usePostgres)
{
    try
    {
        var connString = builder.Environment.IsProduction()
            ? builder.Configuration.GetConnectionString("PostgresStatsProduction")
            : builder.Configuration.GetConnectionString("PostgresStats");
        
        // Sostituisci variabili ambiente in production
        if (builder.Environment.IsProduction())
        {
            connString = connString?
                .Replace("${POSTGRES_USER}", Environment.GetEnvironmentVariable("POSTGRES_USER") ?? "autobidder")
                .Replace("${POSTGRES_PASSWORD}", Environment.GetEnvironmentVariable("POSTGRES_PASSWORD") ?? "");
        }
        
        if (!string.IsNullOrEmpty(connString))
        {
            builder.Services.AddDbContext<AutoBidder.Data.PostgresStatsContext>(options =>
            {
                options.UseNpgsql(connString, npgsqlOptions =>
                {
                    npgsqlOptions.EnableRetryOnFailure(3);
                    npgsqlOptions.CommandTimeout(30);
                });
            });
            
            Console.WriteLine("[Startup] PostgreSQL configured for statistics");
        }
        else
        {
            Console.WriteLine("[Startup] PostgreSQL connection string not found - using SQLite only");
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[Startup] PostgreSQL configuration failed: {ex.Message} - using SQLite only");
    }
}
else
{
    Console.WriteLine("[Startup] PostgreSQL disabled in configuration - using SQLite only");
}

// Registra servizi applicazione come Singleton per condividere stato
var htmlCacheService = new HtmlCacheService(
    maxConcurrentRequests: 3,
    requestsPerSecond: 5,
    cacheExpiration: TimeSpan.FromMinutes(5),
    maxRetries: 2
);

var auctionMonitor = new AuctionMonitor();
htmlCacheService.OnLog += (msg) => Console.WriteLine(msg);

builder.Services.AddSingleton(auctionMonitor);
builder.Services.AddSingleton(htmlCacheService);
builder.Services.AddSingleton(sp => new SessionService(auctionMonitor.GetApiClient()));
builder.Services.AddSingleton<DatabaseService>();
builder.Services.AddSingleton<ApplicationStateService>();
builder.Services.AddSingleton<BidooBrowserService>();
builder.Services.AddScoped<StatsService>(sp =>
{
    var db = sp.GetRequiredService<DatabaseService>();
    
    // Prova a ottenere PostgreSQL context (potrebbe essere null)
    AutoBidder.Data.PostgresStatsContext? postgresDb = null;
    try
    {
        postgresDb = sp.GetService<AutoBidder.Data.PostgresStatsContext>();
    }
    catch
    {
        // PostgreSQL non disponibile, usa solo SQLite
    }
    
    return new StatsService(db, postgresDb);
});
builder.Services.AddScoped<AuctionStateService>();

// Configura SignalR per real-time updates
builder.Services.AddSignalR(options =>
{
    options.MaximumReceiveMessageSize = 102400; // 100KB
    options.EnableDetailedErrors = true;
});

var app = builder.Build();

// ============================================
// INIZIALIZZAZIONE DATABASE IDENTITY
// ============================================
using (var scope = app.Services.CreateScope())
{
    try
    {
        var identityDb = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
        var userManager = scope.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>();
        
        // Crea database Identity
        await identityDb.Database.EnsureCreatedAsync();
        Console.WriteLine("[Identity] Database initialized");

        // Crea utente admin se non esiste
        var adminUsername = Environment.GetEnvironmentVariable("ADMIN_USERNAME") ?? "admin";
        var adminPassword = Environment.GetEnvironmentVariable("ADMIN_PASSWORD");

        // Password di default se non configurata (stessa per debug e container)
        if (string.IsNullOrEmpty(adminPassword))
        {
            adminPassword = "Admin@Password123!";
        }

        var existingAdmin = await userManager.FindByNameAsync(adminUsername);
        if (existingAdmin == null)
        {
            var adminUser = new ApplicationUser
            {
                UserName = adminUsername,
                Email = $"{adminUsername}@autobidder.local",
                EmailConfirmed = true,
                IsActive = true,
                CreatedAt = DateTime.UtcNow
            };

            var result = await userManager.CreateAsync(adminUser, adminPassword);
            if (result.Succeeded)
            {
                Console.WriteLine($"[Identity] Admin user created: {adminUsername}");
            }
            else
            {
                Console.WriteLine($"[Identity] Failed to create admin user: {string.Join(", ", result.Errors.Select(e => e.Description))}");
            }
        }
        else
        {
            Console.WriteLine($"[Identity] Admin user exists: {adminUsername}");
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[Identity] Initialization error: {ex.Message}");
    }
}

// ??? NUOVO: Inizializza DatabaseService
using (var scope = app.Services.CreateScope())
{
    var databaseService = scope.ServiceProvider.GetRequiredService<DatabaseService>();
    
    try
    {
        Console.WriteLine("[DB] Initializing main database...");
        await databaseService.InitializeDatabaseAsync();
        
        var dbInfo = await databaseService.GetDatabaseInfoAsync();
        Console.WriteLine($"[DB] Database initialized successfully:");
        Console.WriteLine($"[DB]   Path: {dbInfo.Path}");
        Console.WriteLine($"[DB]   Size: {dbInfo.SizeFormatted}");
        Console.WriteLine($"[DB]   Version: {dbInfo.Version}");
        Console.WriteLine($"[DB]   Auctions: {dbInfo.AuctionsCount}");
        Console.WriteLine($"[DB]   Bid History: {dbInfo.BidHistoryCount}");
        Console.WriteLine($"[DB]   Product Stats: {dbInfo.ProductStatsCount}");
        
        // Verifica salute database
        var isHealthy = await databaseService.CheckDatabaseHealthAsync();
        Console.WriteLine($"[DB] Database health check: {(isHealthy ? "OK" : "FAILED")}");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[DB ERROR] Failed to initialize database: {ex.Message}");
        Console.WriteLine($"[DB ERROR] Stack trace: {ex.StackTrace}");
    }
}

// Crea database statistiche se non esiste (senza migrations)
using (var scope = app.Services.CreateScope())
{
    var db = scope.ServiceProvider.GetRequiredService<StatisticsContext>();
    
    try
    {
        // Log percorso database
        var connection = db.Database.GetDbConnection();
        Console.WriteLine($"[STATS DB] Database path: {connection.DataSource}");
        
        // Verifica se database esiste
        var dbExists = db.Database.CanConnect();
        Console.WriteLine($"[STATS DB] Database exists: {dbExists}");
        
        // Forza creazione tabelle se non esistono
        if (!dbExists || !db.ProductStats.Any())
        {
            Console.WriteLine("[STATS DB] Creating database schema...");
            db.Database.EnsureDeleted(); // Elimina database vecchio
            db.Database.EnsureCreated(); // Ricrea con schema aggiornato
            Console.WriteLine("[STATS DB] Database schema created successfully");
        }
        else
        {
            Console.WriteLine($"[STATS DB] Database already exists with {db.ProductStats.Count()} records");
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[STATS DB ERROR] Failed to initialize database: {ex.Message}");
        Console.WriteLine($"[STATS DB ERROR] Stack trace: {ex.StackTrace}");
        
        // Prova a ricreare forzatamente
        try
        {
            Console.WriteLine("[STATS DB] Attempting forced recreation...");
            db.Database.EnsureDeleted();
            db.Database.EnsureCreated();
            Console.WriteLine("[STATS DB] Forced recreation successful");
        }
        catch (Exception ex2)
        {
            Console.WriteLine($"[STATS DB ERROR] Forced recreation failed: {ex2.Message}");
        }
    }
}

// Inizializza PostgreSQL per statistiche avanzate
using (var scope = app.Services.CreateScope())
{
    try
    {
        var postgresDb = scope.ServiceProvider.GetService<AutoBidder.Data.PostgresStatsContext>();
        
        if (postgresDb != null)
        {
            Console.WriteLine("[PostgreSQL] Initializing PostgreSQL statistics database...");
            
            var autoCreateSchema = app.Configuration.GetValue<bool>("Database:AutoCreateSchema", true);
            
            if (autoCreateSchema)
            {
                // Usa il metodo EnsureSchemaAsync che gestisce la creazione automatica
                var schemaCreated = await postgresDb.EnsureSchemaAsync();
                
                if (schemaCreated)
                {
                    // Valida che tutte le tabelle siano state create
                    var schemaValid = await postgresDb.ValidateSchemaAsync();
                    
                    if (schemaValid)
                    {
                        Console.WriteLine("[PostgreSQL] Statistics features ENABLED");
                    }
                    else
                    {
                        Console.WriteLine("[PostgreSQL] Schema validation failed");
                        Console.WriteLine("[PostgreSQL] Statistics features DISABLED (missing tables)");
                    }
                }
                else
                {
                    Console.WriteLine("[PostgreSQL] Cannot connect to database");
                    Console.WriteLine("[PostgreSQL] Statistics features will use SQLite fallback");
                }
            }
            else
            {
                Console.WriteLine("[PostgreSQL] Auto-create schema disabled");
                
                // Prova comunque a validare lo schema esistente
                try
                {
                    var schemaValid = await postgresDb.ValidateSchemaAsync();
                    if (schemaValid)
                    {
                        Console.WriteLine("[PostgreSQL] Existing schema validated successfully");
                        Console.WriteLine("[PostgreSQL] Statistics features ENABLED");
                    }
                    else
                    {
                        Console.WriteLine("[PostgreSQL] Statistics features DISABLED (schema not found)");
                    }
                }
                catch
                {
                    Console.WriteLine("[PostgreSQL] Statistics features DISABLED (schema not found)");
                }
            }
        }
        else
        {
            Console.WriteLine("[PostgreSQL] Not configured - Statistics will use SQLite only");
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[PostgreSQL ERROR] Initialization failed: {ex.Message}");
        Console.WriteLine($"[PostgreSQL ERROR] Stack trace: {ex.StackTrace}");
        Console.WriteLine($"[PostgreSQL] Statistics features will use SQLite fallback");
    }
}

// ??? NUOVO: Ripristina aste salvate e riprendi monitoraggio se configurato
using (var scope = app.Services.CreateScope())
{
    try
    {
        Console.WriteLine("[STARTUP] Loading saved auctions...");
        
        // Carica impostazioni
        var settings = AutoBidder.Utilities.SettingsManager.Load();
        Console.WriteLine($"[STARTUP] Remember auction states: {settings.RememberAuctionStates}");
        Console.WriteLine($"[STARTUP] Default start on load: {settings.DefaultStartAuctionsOnLoad}");
        
        // Carica aste salvate
        var savedAuctions = AutoBidder.Utilities.PersistenceManager.LoadAuctions();
        Console.WriteLine($"[STARTUP] Found {savedAuctions.Count} saved auctions");
        
        if (savedAuctions.Count > 0)
        {
            var monitor = scope.ServiceProvider.GetRequiredService<AuctionMonitor>();
            var appState = scope.ServiceProvider.GetRequiredService<ApplicationStateService>();
            
            // Aggiungi tutte le aste al monitor E a ApplicationStateService
            foreach (var auction in savedAuctions)
            {
                monitor.AddAuction(auction);
                Console.WriteLine($"[STARTUP] Loaded auction: {auction.Name} (ID: {auction.AuctionId})");
            }
            
            // Popola ApplicationStateService con le aste caricate
            appState.SetAuctions(savedAuctions);
            Console.WriteLine($"[STARTUP] Populated ApplicationStateService with {savedAuctions.Count} auctions");
            
            // Gestisci comportamento di avvio
            if (settings.RememberAuctionStates)
            {
                // Modalità "Ricorda Stato": mantiene lo stato salvato di ogni asta
                var activeAuctions = savedAuctions.Where(a => a.IsActive && !a.IsPaused).ToList();
                
                if (activeAuctions.Any())
                {
                    Console.WriteLine($"[STARTUP] Resuming monitoring for {activeAuctions.Count} active auctions");
                    monitor.Start();
                    appState.IsMonitoringActive = true;
                    appState.AddLog($"[STARTUP] Ripristinato stato salvato: {activeAuctions.Count} aste attive");
                }
                else
                {
                    Console.WriteLine("[STARTUP] No active auctions to resume");
                    appState.AddLog("[STARTUP] Nessuna asta attiva salvata");
                }
            }
            else
            {
                // Modalità "Default": applica DefaultStartAuctionsOnLoad a tutte le aste
                switch (settings.DefaultStartAuctionsOnLoad)
                {
                    case "Active":
                        // Avvia tutte le aste
                        Console.WriteLine("[STARTUP] Starting all auctions (Active mode)");
                        foreach (var auction in savedAuctions)
                        {
                            auction.IsActive = true;
                            auction.IsPaused = false;
                        }
                        monitor.Start();
                        appState.IsMonitoringActive = true;
                        appState.AddLog($"[AUTO-START] Avviate automaticamente {savedAuctions.Count} aste");
                        break;
                        
                    case "Paused":
                        // Mette in pausa tutte le aste
                        Console.WriteLine("[STARTUP] Starting in paused mode");
                        foreach (var auction in savedAuctions)
                        {
                            auction.IsActive = true;
                            auction.IsPaused = true;
                        }
                        monitor.Start();
                        appState.IsMonitoringActive = true;
                        appState.AddLog($"[AUTO-START] Aste in pausa: {savedAuctions.Count}");
                        break;
                        
                    case "Stopped":
                    default:
                        // Ferma tutte le aste (default)
                        Console.WriteLine("[STARTUP] Starting in stopped mode");
                        foreach (var auction in savedAuctions)
                        {
                            auction.IsActive = false;
                            auction.IsPaused = false;
                        }
                        appState.AddLog($"[STARTUP] Aste fermate all'avvio: {savedAuctions.Count}");
                        break;
                }
            }
        }
        else
        {
            Console.WriteLine("[STARTUP] No saved auctions found");
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"[STARTUP ERROR] Failed to load auctions: {ex.Message}");
        Console.WriteLine($"[STARTUP ERROR] Stack trace: {ex.StackTrace}");
    }
}

// Configure the HTTP request pipeline
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    
    // Abilita HSTS solo se HTTPS è attivo
    if (enableHttps)
    {
        app.UseHsts();
    }
}
else
{
    app.UseDeveloperExceptionPage();
}

// Abilita HTTPS redirection solo se HTTPS è configurato
if (enableHttps)
{
    app.UseHttpsRedirection();
}

app.UseStaticFiles();
app.UseRouting();

// ============================================
// MIDDLEWARE AUTENTICAZIONE E AUTORIZZAZIONE
// ============================================
app.UseAuthentication();
app.UseAuthorization();

app.MapRazorPages(); // ? AGGIUNTO: abilita Razor Pages (Login, Logout)
app.MapBlazorHub();
app.MapFallbackToPage("/_Host");

app.Run();