using MP.IOC.Data;
using MP.IOC.Services;
using NLog;
using NLog.Web;
using StackExchange.Redis;
using System.Net;

var builder = WebApplication.CreateBuilder(args);

var logger = LogManager.Setup()
                .LoadConfigurationFromAppSettings()
                .GetCurrentClassLogger();
logger.Info("Program.cs: startup");

// Config setup
ConfigurationManager configuration = builder.Configuration;
// REDIS setup
logger.Info("Config OK");
string connStringRedis = configuration.GetConnectionString("Redis");
string redisSrvAddr = connStringRedis.Substring(0, connStringRedis.IndexOf(":"));
logger.Info("Setup REDIS OK");


// YARP base config
builder.Services.AddReverseProxy().LoadFromConfig(builder.Configuration.GetSection("ReverseProxy"));
builder.Services.AddHttpForwarder();

// HttpMessageInvoker (SocketsHttpHandler)
builder.Services.AddSingleton(sp =>
{
    var handler = new SocketsHttpHandler
    {
        AllowAutoRedirect = false,
        UseCookies = false,
        PooledConnectionLifetime = TimeSpan.FromMinutes(5),
        AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
    };

    // Accetta certificati non validi (dev only)
    handler.SslOptions = new System.Net.Security.SslClientAuthenticationOptions
    {
        RemoteCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true
    };

    return new HttpMessageInvoker(handler);
});
logger.Info("YARP reverse proxy configured");

// base services
builder.Services.AddSingleton<PreserveBodyTransformer>();
builder.Services.AddSingleton<RouteStatsManager>();
builder.Services.AddHostedService<MetricsFlushService>();

// generic controller
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// avvio oggetto shared x redis...
var redisMux = ConnectionMultiplexer.Connect(connStringRedis);
builder.Services.AddSingleton<IConnectionMultiplexer>(redisMux);
builder.Services.AddSingleton<MpDataService>();

logger.Info("Standard service configured");

// WeightProvider: Redis/Memory da config
var weightOnRedis = builder.Configuration.GetValue<bool>("ServerConf:RedisWeight", false);
if (weightOnRedis)
{
    builder.Services.AddSingleton<IConnectionMultiplexer>(redisMux);
    builder.Services.AddSingleton<IWeightProvider, RedisWeightProvider>();
}
else
{
    builder.Services.AddSingleton<IWeightProvider, InMemoryWeightProvider>();
}
logger.Info($"Weight service configured | use Redis: {weightOnRedis}");

// RouteManager registration (singleton)
builder.Services.AddSingleton<RouteManager>();
logger.Info("Singleton Route Manager registered");

var app = builder.Build();

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

// Map route to RouteManager
app.Map("/MP/IOC/api/RIOB/{**catchAll}", async (HttpContext ctx) =>
{
    var routeManager = ctx.RequestServices.GetRequiredService<RouteManager>();
    await routeManager.HandleAsync(ctx);
});
logger.Info("App: route Mapped");


// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment() || app.Environment.IsStaging())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
logger.Info("Added swagger");

app.UseHttpsRedirection();

app.UseAuthorization();

// aggiunta x index.html
app.UseDefaultFiles();
app.UseStaticFiles();

app.MapControllers();

logger.Info("Run App");

app.Run();