using System.Reflection;
using System.Text;
using FastEndpoints;
using FastEndpoints.Swagger;
using GB5Shared.Connection;
using GB5Shared.Telemetry;
using GB5Shared.DateConverter;
using static GB5Shared.DateConverter.GB5JsonOptions;
using GB5Shared.DTO.Framework.CommonConfig;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.GB5CommonFunction;
using GB5Shared.GenerateAutoNumber;
using GB5Shared.ListQuery;
using GB5Shared.QueryExecutor;
using GB5Shared.Validation;
using Microsoft.AspNetCore.HttpOverrides;
using Microsoft.AspNetCore.ResponseCompression;
using Microsoft.AspNetCore.Server.Kestrel.Core;
using Microsoft.Extensions.Caching.Hybrid;
using Newtonsoft.Json;
using OpenTelemetry;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

// -------------------------
// Bootstrap
// -------------------------
var builder = WebApplication.CreateBuilder(args);

// ── Port from config — change "AppPort" in appsettings.json to use any port ──
var appPort = builder.Configuration.GetValue<int>("AppPort");
builder.WebHost.UseUrls($"http://0.0.0.0:{appPort}");

// -------------------------
// Console Encoding
// -------------------------
Console.OutputEncoding = Encoding.UTF8;

// -------------------------
// Dapr & Controllers Setup
// -------------------------
builder.Services.AddDaprClient();

builder.Services.AddControllers()
    .AddDapr()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.PropertyNamingPolicy = null;
        options.JsonSerializerOptions.DictionaryKeyPolicy = null;
        options.JsonSerializerOptions.AddGB5Converters();
    });

// -------------------------
// JSON Global (Minimal API / HttpContext)
// -------------------------
builder.Services.ConfigureHttpJsonOptions(options =>
{
    options.SerializerOptions.PropertyNamingPolicy = null;
    options.SerializerOptions.DictionaryKeyPolicy = null;
    options.SerializerOptions.AddGB5Converters();
});

// -------------------------
// Caching
// -------------------------
#pragma warning disable EXTEXP0018
builder.Services.AddHybridCache(options =>
{
    options.DefaultEntryOptions = new HybridCacheEntryOptions();
    options.DisableCompression = false;
});
#pragma warning restore EXTEXP0018

builder.Services.AddMemoryCache();
builder.Services.AddDistributedMemoryCache();

// -------------------------
// CORS Policy
// -------------------------

// -------------------------
// HTTP Context
// -------------------------
builder.Services.AddHttpContextAccessor();

// -------------------------
// Login Header (per-request from HTTP header)
// -------------------------
// âš  FOR HTTP ENDPOINTS ONLY.
// Returns empty DTO instead of throwing — prevents crashes in
// background scopes that transitively touch this registration.
builder.Services.AddScoped<LoginDTO>(sp =>
{
    var httpContext = sp.GetRequiredService<IHttpContextAccessor>().HttpContext;
    if (httpContext != null &&
        httpContext.Request.Headers.TryGetValue("Login", out var loginHeader))
        return JsonConvert.DeserializeObject<LoginDTO>(loginHeader!)!;

    return new LoginDTO();
});

// -------------------------
// Application Services
// -------------------------
builder.Services.AddScoped<IApplicationConnection, ApplicationConnection>();
builder.Services.AddScoped<IQueryExecutor, QueryExecutor>();
builder.Services.AddScoped<IGB5CommonFunction, GB5CommonFunction>();
builder.Services.AddScoped<IValidation, Validation>();
builder.Services.AddScoped<AutoNumber>();
builder.Services.AddScoped<GB5Shared.CriteriaConfig.ICriteriaConfigFastSave, GB5Shared.CriteriaConfig.CriteriaConfigFastSave>();

builder.Services.Configure<Gb5SystemDTO>(
    builder.Configuration.GetSection("Gb5SystemDTO"));

// -------------------------
// Kestrel
// -------------------------
builder.Services.Configure<KestrelServerOptions>(options =>
{
    options.AllowSynchronousIO = true;
});

// -------------------------
// Response Compression
// -------------------------
builder.Services.AddResponseCompression(o =>
{
    o.EnableForHttps = true;
    o.Providers.Add<GzipCompressionProvider>();
});
// -- OpenTelemetry (Tracing + Metrics) ----------------------------------------
builder.Services.AddGB5Telemetry(builder.Configuration, "GB5-PIE");

// -------------------------
// Assembly Scan for DI
// -------------------------
// PIE uses PostgreSQL — IQueryExecutor routes to the correct DB engine at runtime
// via LoginDTO.DatabaseType. No special registration needed beyond the standard QueryExecutor.
var pieBLLAssembly = Assembly.Load("PIEBLL");
var pieDALAssembly = Assembly.Load("PIEDAL");

builder.Services.Scan(scan => scan
    .FromAssemblies(pieBLLAssembly, pieDALAssembly)
    .AddClasses(c => c.Where(t => !t.IsAbstract && !t.IsInterface
                && (t.Namespace == null || !t.Namespace.Contains(".DTO"))))
    .AsImplementedInterfaces()
    .WithScopedLifetime());

// IListDispatcher + GenericListHandler + IQueryBuilder registrations
// Scans PIEDAL for all IQueryBuilder<TQ,TR> implementations and auto-registers
// GenericListHandler<TQ,TR> as IListHandler<TQ,TR> for each one found.
builder.Services.AddListInfrastructure(pieDALAssembly);

// -------------------------
// FastEndpoints
// -------------------------
var endpointAssemblies = new[]
{
    Assembly.Load("PIESL"),
    Assembly.Load("PIEBLL"),
    Assembly.Load("PIEDAL"),
    Assembly.Load("GB5Shared")
};

builder.Services.AddFastEndpoints(o =>
{
    o.Assemblies = endpointAssemblies;
});

// -------------------------
// Swagger
// -------------------------
builder.Services.SwaggerDocument(o =>
{
    o.DocumentSettings = s =>
    {
        s.Title = "GB5 PIE API";
        s.Version = "v1";
        s.Description = "GB5 Product Intelligence Engine Microservice — global module/config/variant/profile knowledge store";
    };
});

// -------------------------
// Build App
// -------------------------
var app = builder.Build();

// -------------------------
// Middleware
// -------------------------

// 1. Reverse-proxy header forwarding (must be first)
app.UseForwardedHeaders();

// 2. CORS (before auth)

// 3. Response Compression
app.UseResponseCompression();

// 4. Dapr CloudEvents + pub/sub subscription handler
app.UseCloudEvents();

// 5. Session heartbeat + FastEndpoints
app.UseMiddleware<GB5Shared.Telemetry.Middleware.RequestTracingMiddleware>();
app.UseMiddleware<GB5Shared.Middleware.SessionHeartbeatMiddleware>();

app.UseFastEndpoints(c =>
{
    c.Serializer.Options.PropertyNamingPolicy = null;
    c.Serializer.Options.DictionaryKeyPolicy = null;
    c.Serializer.Options.AddGB5Converters();
});

// 6. MVC Controllers (Dapr subscribers use controller-based subscription)
app.MapControllers();

// 7. Dapr subscribe handler
app.MapSubscribeHandler();

// -------------------------
// Swagger UI (All Environments)
// -------------------------
app.UseOpenApi();

app.UseSwaggerUi(o =>
{
    o.Path = "/GB5Documentation";
    o.DocumentPath = "/swagger/{documentName}/swagger.json";
    o.TransformToExternalPath = (internalUiRoute, _) => "/pie" + internalUiRoute;
});

// -------------------------
// Test Endpoint
// -------------------------
app.MapGet("/", () => "Hello from GB5 PIE (Product Intelligence Engine) in .NET 9!");

// -------------------------
// HTTPS & Authorization
// -------------------------
app.UseAuthorization();

// -------------------------
// Run the Application
// -------------------------
app.Run();