using Microsoft.AspNetCore.Authentication.Negotiate;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.FileProviders;
using MP.Data;
using MP.SPEC.Components;
using MP.SPEC.Data;
using MP.SPEC.Services;
using NLog;
using NLog.Targets;
using NLog.Web;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using StackExchange.Redis;
using ZiggyCreatures.Caching.Fusion;
using ZiggyCreatures.Caching.Fusion.Backplane.StackExchangeRedis;
using ZiggyCreatures.Caching.Fusion.Serialization.NewtonsoftJson;

var builder = WebApplication.CreateBuilder(args);

ConfigurationManager configuration = builder.Configuration;

var logger = LogManager.Setup()
                .LoadConfigurationFromAppSettings()
                .GetCurrentClassLogger();

logger.Info("Program.cs: startup");

// REDIS setup
logger.Info("Setup REDIS");
string connStringRedis = configuration.GetConnectionString("Redis") ?? "localhost:6379";
//string connStringRedis = ConfMan.GetConnectionString("RedisAdmin");
string redisSrvAddr = connStringRedis.Substring(0, connStringRedis.IndexOf(":"));
// avvio oggetto shared x redis...
IConnectionMultiplexer redisMultiplexer = ConnectionMultiplexer.Connect(connStringRedis);


// ====================================================================
// Setup Tracing e Telemetria...
// ====================================================================

// 1. Leggiamo la configurazione
var otelEnabled = builder.Configuration.GetValue<bool>("Otel:EnableTracing", false);
var otelEndpoint = builder.Configuration["Otel:Endpoint"];
var otelDsn = builder.Configuration["Otel:Dsn"];

if (otelEnabled)
{
    // ====================================================================
    // SETUP OPENTELEMETRY BASE (Genera gli oggetti Activity)
    // Questo gira per i Livelli 1, 2 e 3.
    // ====================================================================
    var appVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "1.0.0";

    builder.Services.AddOpenTelemetry()
        .WithTracing(tracerProviderBuilder =>
        {
            tracerProviderBuilder
                .SetResourceBuilder(OpenTelemetry.Resources.ResourceBuilder.CreateDefault()
                    .AddService(serviceName: "MAPO.SPEC", serviceVersion: appVersion))
                .AddSource("MP.DATA.Tracer")
                .AddAspNetCoreInstrumentation(options => { options.Filter = ctx => !ctx.Request.Path.StartsWithSegments("/health"); })
                .AddSqlClientInstrumentation(options => { options.RecordException = true; })
                .AddRedisInstrumentation(redisMultiplexer);

            // ====================================================================
            // ESPORTAZIONE DI RETE (Solo Livelli 1 e 2)
            // ====================================================================
            if (!string.IsNullOrWhiteSpace(otelEndpoint))
            {
                tracerProviderBuilder.AddOtlpExporter(options =>
                {
                    options.Endpoint = new Uri(otelEndpoint);
                    if (!string.IsNullOrWhiteSpace(otelDsn))
                    {
                        options.Headers = $"uptrace-dsn={otelDsn}";
                    }
                    options.Protocol = OpenTelemetry.Exporter.OtlpExportProtocol.Grpc;
                });
            }
            // Se otelEndpoint è vuoto (Livello 3), le tracce nascono e muoiono in RAM.
        });

    // ====================================================================
    // ESPORTAZIONE NLOG REALTIME (Solo Livelli 1 e 2)
    // ====================================================================
    if (!string.IsNullOrWhiteSpace(otelEndpoint))
    {
        var otlpTarget = new OtlpTarget
        {
            Name = "UptraceRealtime",
            Endpoint = otelEndpoint,
            ServiceName = "MP.DATA.Tracer"
        };

        if (!string.IsNullOrWhiteSpace(otelDsn))
        {
            otlpTarget.Headers = $"uptrace-dsn={otelDsn}";
        }

        var config = LogManager.Configuration ?? new NLog.Config.LoggingConfiguration();
        config.AddTarget(otlpTarget);
        config.AddRule(NLog.LogLevel.Info, NLog.LogLevel.Fatal, otlpTarget);
        LogManager.Configuration = config;
        LogManager.ReconfigExistingLoggers();

        logger.Info($"🚀 NLog & OTel attivi e in invio verso: {otelEndpoint}");
    }
    else
    {
        logger.Info("ℹ️ OTel attivo (Local mode). Esportazione di rete disabilitata.");
    }
}
else
{
    // ====================================================================
    // LIVELLO 4: TUTTO SPENTO
    // ====================================================================
    logger.Info("⏸️ Telemetria e Tracing completamente disabilitati.");
}

// Add services to the container.
logger.Info("Setup Auth");
builder.Services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)
   .AddNegotiate();

builder.Services.AddAuthorization(options =>
{
    // By default, all incoming requests will be authorized according to the default policy.
    options.FallbackPolicy = options.DefaultPolicy;
});

//setup Blazor
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();

builder.Services.AddRazorPages();

// memory + redis preliminare
builder.Services.AddSingleton<IConnectionMultiplexer>(redisMultiplexer);

// ✅ Distributed cache (necessario per FusionCache)
builder.Services.AddStackExchangeRedisCache(options =>
{
    options.Configuration = connStringRedis;
});

// ✅ FusionCache
builder.Services.AddFusionCache()
    .WithDistributedCache(sp => sp.GetRequiredService<IDistributedCache>())
    .WithSerializer(new FusionCacheNewtonsoftJsonSerializer())
    .WithBackplane(new RedisBackplane(new RedisBackplaneOptions
    {
        ConnectionMultiplexerFactory = () => Task.FromResult(redisMultiplexer)
    }));

// Metodi principali x accesso dati
var connStr = builder.Configuration.GetConnectionString("MP.Data")
              ?? throw new InvalidOperationException("ConnString 'MP.Data' mancante.");
// aggiungo il costruttore x i vari DbContextFactory
builder.Services.AddDbContextFactory<MoonProContext>(options =>
    options.UseSqlServer(connStr)
           .EnableSensitiveDataLogging(false) // true solo in Sviluppo
           .ConfigureWarnings(w => w.Ignore(CoreEventId.ManyServiceProvidersCreatedWarning)));
builder.Services.AddDbContextFactory<MoonPro_VocContext>(options =>
    options.UseSqlServer(connStr)
           .EnableSensitiveDataLogging(false) // true solo in Sviluppo
           .ConfigureWarnings(w => w.Ignore(CoreEventId.ManyServiceProvidersCreatedWarning)));

// MP.Data Services Utils - Statistiche DB
builder.Services.AddSpecDataLayer();

// servizi del progetto SPEC
builder.Services.TryAddScoped<MpDataService>();
builder.Services.TryAddSingleton<IOApiService>();
builder.Services.TryAddScoped<MsgServiceSpec>();

#if false
builder.Services.AddSingleton<AppAuthService>();
builder.Services.AddSingleton<ListSelectDataSrv>();
builder.Services.AddSingleton<SharedMemService>();
builder.Services.AddSingleton<TabDataService>();
builder.Services.AddSingleton<TabDataFeeder>(); 
#endif

#if false
// aggiunta helper local/session storage service
builder.Services.AddScoped<ISessionStorageService, SessionStorageService>();
builder.Services.AddScoped<ILocalStorageService, LocalStorageService>(); 
#endif


builder.Services.AddHttpClient();

logger.Info("Aggiunti services");


var app = builder.Build();
logger.Info("Build App");


// aggiunt base URL x routing corretto
string baseUrl = configuration.GetValue<string>("SpecialConf:AppUrl") ?? "";
app.UsePathBase(baseUrl);
logger.Info($"BaseUrl: {baseUrl}");

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    // 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.UseRouting();

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

app.UseAntiforgery();

// gestione static files: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/static-files?view=aspnetcore-8.0
string BasePathOdlReturn = configuration.GetValue<string>("ServerConf:BasePathOdlReturn") ?? configuration.GetValue<string>("OptConf:BasePathOdlReturn") ?? "";
if (!string.IsNullOrEmpty(BasePathOdlReturn))
{
    // preparo mappings opzionali se presenti in conf...
    var provider = new FileExtensionContentTypeProvider();
    // vedere https://code-maze.com/dotnet-appsettings-json-content-to-dictionary/
    var mimeSection = configuration.GetSection("ServerConf:MimeMappings");
    if (mimeSection != null)
    {
        var mimeDict = mimeSection
            .AsEnumerable()
            .Where(x => !string.IsNullOrWhiteSpace(x.Value))
            .ToDictionary(x => x.Key.Replace("ServerConf:MimeMappings:", ""), x => x.Value);
        // se ne ho trovati
        if (mimeDict != null && mimeDict.Count > 0)
        {
            // li aggiungo! vedere 
            // https://thechrisgreen.com/2022/05/add-a-mime-type-to-an-asp-net-core-net-6-app/
            // https://harrybellamy.com/posts/getting-mime-types-from-file-extensions-in-net-core/
            foreach (var item in mimeDict)
            {
                if (!string.IsNullOrEmpty(item.Value))
                {
                    // Add new mappings
                    provider.Mappings[item.Key] = item.Value;
                }
            }

        }
    }
    // verifico esista folder
    if (Directory.Exists(BasePathOdlReturn))
    {
        // gestione cartella x file ritornati x ODL
        app.UseStaticFiles(new StaticFileOptions
        {
            ContentTypeProvider = provider,
            FileProvider = new PhysicalFileProvider(BasePathOdlReturn),
            RequestPath = "/RET_DATA",
        });
    }
}

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

logger.Info("Run App");

app.Run();