using Blazored.LocalStorage;
using Blazored.SessionStorage;
using Microsoft.AspNetCore.Authentication.Negotiate;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.FileProviders;
using MP.AppAuth.Services;
using MP.Data.Services;
using MP.SPEC.Components;
using MP.SPEC.Data;
using MP.SPEC.Services;
using NLog;
using NLog.Targets;
using NLog.Targets.OpenTelemetryProtocol;
using NLog.Web;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using StackExchange.Redis;


var builder = WebApplication.CreateBuilder(args);

/*--------------------
 * Note migrazione startup.cs --> program.cs:
 * 
 * - https://stackoverflow.com/questions/69722872/asp-net-core-6-how-to-access-ConfMan-during-startup
 * - https://docs.microsoft.com/en-us/aspnet/core/migration/50-to-60?view=aspnetcore-5.0&tabs=visual-studio#where-do-i-put-state-that-was-stored-as-fields-in-my-program-or-startup-class
 * 
 * */

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...
var redisMultiplexer = ConnectionMultiplexer.Connect(connStringRedis);

// Check develop e conseguente Uptrace setup
// CONTROLLO GLOBALE: Tutto questo gira SOLO in Development
if (builder.Environment.IsDevelopment())
{
    var uptraceEndpoint = builder.Configuration["UptraceDev:Endpoint"];
    var uptraceDsn = builder.Configuration["UptraceDev:Dsn"];

    // Se le variabili di configurazione esistono nel json locale, attiviamo la magia
    if (!string.IsNullOrEmpty(uptraceEndpoint) && !string.IsNullOrEmpty(uptraceDsn))
    {
        // ====================================================================
        // 1. SETUP NLOG (Per i log in tempo reale)
        // ====================================================================
        var otlpTarget = new OtlpTarget
        {
            Name = "UptraceRealtime",
            Endpoint = uptraceEndpoint,
            ServiceName = "MP.DATA.Tracer",
            Headers = $"uptrace-dsn={uptraceDsn}"
        };

        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();

        Console.WriteLine("🚀 NLog OTLP Target attivato per Uptrace in Development!");

        // ====================================================================
        // 2. SETUP OPENTELEMETRY (Per gli Span, HTTP, DB e Redis in tempo reale)
        // ====================================================================
        var appVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "1.0.0";

        builder.Services.AddOpenTelemetry()
            .WithTracing(tracerProviderBuilder =>
            {
                tracerProviderBuilder
                    // Definiamo il nome e versione del servizio CORRENTE su Uptrace
                    .SetResourceBuilder(ResourceBuilder.CreateDefault()
                        .AddService(serviceName: "MAPO.SPEC", serviceVersion: appVersion))

                    // Diciamo a OTel di ascoltare gli Span manuali generati
                    .AddSource("MP.DATA.Tracer")

                    // Strumentazione Automatica
                    .AddAspNetCoreInstrumentation(options =>
                    {
                        options.Filter = (httpContext) => !httpContext.Request.Path.StartsWithSegments("/health");
                    })
                    .AddSqlClientInstrumentation(options =>
                    {
                        options.RecordException = true;
                    })
                    // Assicurati che redisMultiplexer sia inizializzato PRIMA di questo blocco
                    .AddRedisInstrumentation(redisMultiplexer)

                    // Esporta i dati verso Uptrace
                    .AddOtlpExporter(options =>
                    {
                        options.Endpoint = new Uri(uptraceEndpoint);
                        options.Headers = $"uptrace-dsn={uptraceDsn}";
                        options.Protocol = OpenTelemetry.Exporter.OtlpExportProtocol.Grpc;
                    });

                // Scommenta per testare in console
                // .AddConsoleExporter();
            });

        Console.WriteLine("🚀 OpenTelemetry Tracing attivato per Uptrace in Development!");
    }
    else
    {
        Console.WriteLine("⚠️ Variabili UptraceDev mancanti nel json. Telemetria realtime disabilitata.");
    }
}


// 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;
});

// redis replliminare
builder.Services.AddSingleton<IConnectionMultiplexer>(redisMultiplexer);
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSingleton<MpDataService>();
builder.Services.AddSingleton<ListSelectDataSrv>();
builder.Services.AddSingleton<IOApiService>();
builder.Services.AddSingleton<AppAuthService>();
builder.Services.AddScoped<MsgServiceSpec>();
builder.Services.AddBlazoredLocalStorage();
builder.Services.AddBlazoredSessionStorage();

builder.Services.AddHttpClient();

logger.Info("Aggiunti services");


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


// aggiunt base URL x routing corretto
app.UsePathBase(configuration.GetValue<string>("SpecialConf:AppUrl"));

// 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();

// 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)
            {
                // 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.UseRouting();

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

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
    endpoints.MapBlazorHub();
    endpoints.MapFallbackToPage("/_Host");
});
//app.MapBlazorHub();
//app.MapFallbackToPage("/_Host");

logger.Info("Run App");

app.Run();