using Managing.Application.Workers;
using Managing.Bootstrap;
using Managing.Common;
using Managing.Infrastructure.Databases.InfluxDb.Models;
using Managing.Infrastructure.Databases.PostgreSql;
using Managing.Infrastructure.Databases.PostgreSql.Configurations;
using Microsoft.EntityFrameworkCore;
using Npgsql;

// Explicitly set the environment before creating the host builder
var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") 
                  ?? Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT") 
                  ?? "Development";

var hostBuilder = new HostBuilder()
    .UseEnvironment(environment)
    .UseContentRoot(AppContext.BaseDirectory);

var host = hostBuilder
    .ConfigureAppConfiguration((hostingContext, config) =>
    {
        var detectedEnv = hostingContext.HostingEnvironment.EnvironmentName;
        
        if (detectedEnv != environment)
        {
            Console.WriteLine($"⚠️  WARNING: Environment mismatch! Expected: {environment}, Got: {detectedEnv}");
        }

        config.SetBasePath(AppContext.BaseDirectory);
        
        // Load configuration files in order (later files override earlier ones)
        // 1. Base appsettings.json (always loaded)
        config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
        
        // 2. Load ONLY the environment-specific file (not other environments)
        if (!string.IsNullOrEmpty(detectedEnv))
        {
            var envFile = $"appsettings.{detectedEnv}.json";
            config.AddJsonFile(envFile, optional: true, reloadOnChange: true);
        }
        
        // 3. Environment variables (highest priority)
        config.AddEnvironmentVariables();
        
        // User secrets only in development (requires ASP.NET Core, so we skip in production)
        if (detectedEnv == "Development")
        {
            try
            {
                config.AddUserSecrets<Program>();
            }
            catch
            {
                // User secrets not available, skip silently
            }
        }
    })
    .ConfigureServices((hostContext, services) =>
    {
        var configuration = hostContext.Configuration;

        // Initialize Sentry
        SentrySdk.Init(options =>
        {
            options.Dsn = configuration["Sentry:Dsn"];
            options.Debug = false;
            options.SendDefaultPii = true;
            options.AutoSessionTracking = true;
            options.IsGlobalModeEnabled = false;
            options.TracesSampleRate = 0.1;
            options.Environment = hostContext.HostingEnvironment.EnvironmentName;
        });

        // Configure database
        var postgreSqlConnectionString = configuration.GetSection(Constants.Databases.PostgreSql)["ConnectionString"];

        services.Configure<PostgreSqlSettings>(configuration.GetSection(Constants.Databases.PostgreSql));
        services.Configure<InfluxDbSettings>(configuration.GetSection(Constants.Databases.InfluxDb));

        // Build connection string with timeout and pooling settings
        var connectionStringBuilder = new NpgsqlConnectionStringBuilder(postgreSqlConnectionString)
        {
            // Configure connection timeout (default is 15 seconds, increase for network latency)
            Timeout = 30, // 30 seconds for connection establishment
            CommandTimeout = 60, // 60 seconds for command execution
            
            // Configure connection pooling for better performance and reliability
            MaxPoolSize = 100, // Maximum pool size
            MinPoolSize = 5, // Minimum pool size
            
            // Configure KeepAlive to maintain connections and detect network issues
            KeepAlive = 300 // 5 minutes keepalive interval
        };
        var enhancedConnectionString = connectionStringBuilder.ConnectionString;

        // Add DbContext
        services.AddDbContext<ManagingDbContext>((serviceProvider, options) =>
        {
            options.UseNpgsql(enhancedConnectionString, npgsqlOptions =>
            {
                // Enable retry on failure for transient errors
                npgsqlOptions.EnableRetryOnFailure(
                    maxRetryCount: 5, 
                    maxRetryDelay: TimeSpan.FromSeconds(10), 
                    errorCodesToAdd: null);
            });

            if (hostContext.HostingEnvironment.IsDevelopment())
            {
                options.EnableDetailedErrors();
                options.EnableSensitiveDataLogging();
                // SQL logging disabled - uncomment below line if needed for debugging
                // options.LogTo(Console.WriteLine, LogLevel.Information);
            }

            options.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);
            options.EnableServiceProviderCaching();
        }, ServiceLifetime.Scoped);

        // Register compute dependencies (no Orleans)
        services.RegisterComputeDependencies(configuration);

        // Configure BacktestComputeWorker options
        services.Configure<BacktestComputeWorkerOptions>(
            configuration.GetSection(BacktestComputeWorkerOptions.SectionName));

        // Get task slot from CapRover ({{.Task.Slot}}) or environment variable
        // This identifies which instance of the worker is running
        var taskSlot = Environment.GetEnvironmentVariable("TASK_SLOT") ?? 
                       Environment.GetEnvironmentVariable("CAPROVER_TASK_SLOT") ?? 
                       "0";
        
        // Override WorkerId from environment variable if provided, otherwise use task slot
        var workerId = Environment.GetEnvironmentVariable("WORKER_ID") ?? 
                       configuration["BacktestComputeWorker:WorkerId"] ?? 
                       $"{Environment.MachineName}-{taskSlot}";
        services.Configure<BacktestComputeWorkerOptions>(options =>
        {
            options.WorkerId = workerId;
        });

        // Configure GeneticComputeWorker options
        services.Configure<GeneticComputeWorkerOptions>(
            configuration.GetSection(GeneticComputeWorkerOptions.SectionName));

        // Override Genetic WorkerId from environment variable if provided, otherwise use task slot
        var geneticWorkerId = Environment.GetEnvironmentVariable("GENETIC_WORKER_ID") ?? 
                              configuration["GeneticComputeWorker:WorkerId"] ?? 
                              $"{Environment.MachineName}-genetic-{taskSlot}";
        services.Configure<GeneticComputeWorkerOptions>(options =>
        {
            options.WorkerId = geneticWorkerId;
        });

        // Register the backtest compute worker if enabled
        var isBacktestWorkerEnabled = configuration.GetValue<bool>("WorkerBacktestCompute", false);
        if (isBacktestWorkerEnabled)
        {
            services.AddHostedService<BacktestComputeWorker>();
        }

        // Register the genetic compute worker if enabled
        var isGeneticWorkerEnabled = configuration.GetValue<bool>("WorkerGeneticCompute", false);
        if (isGeneticWorkerEnabled)
        {
            services.AddHostedService<GeneticComputeWorker>();
        }
    })
    .ConfigureLogging((hostingContext, logging) =>
    {
        logging.ClearProviders();
        logging.AddConsole();
        logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
        
        // Filter out EF Core database command logs (SQL queries)
        logging.AddFilter("Microsoft.EntityFrameworkCore.Database.Command", LogLevel.Warning);
    })
    .Build();

var logger = host.Services.GetRequiredService<ILogger<Program>>();
var config = host.Services.GetRequiredService<IConfiguration>();

// Test database connection at startup
var postgreSqlConnectionString = config.GetSection(Constants.Databases.PostgreSql)["ConnectionString"];
if (string.IsNullOrEmpty(postgreSqlConnectionString))
{
    logger.LogWarning("⚠️  Database connection string is empty or not configured!");
}
else
{
    // Parse and log database host name
    try
    {
        var connectionParts = postgreSqlConnectionString.Split(';')
            .Where(p => !string.IsNullOrWhiteSpace(p))
            .Select(p => p.Trim())
            .ToDictionary(
                p => p.Split('=')[0].Trim(),
                p => p.Contains('=') ? p.Substring(p.IndexOf('=') + 1).Trim() : string.Empty,
                StringComparer.OrdinalIgnoreCase);
        
        var dbHost = connectionParts.GetValueOrDefault("Host", "unknown");
        logger.LogWarning("📊 Database Host: {Host}", dbHost);
    }
    catch
    {
        // Failed to parse connection string, continue anyway
    }
    
    try
    {
        using var scope = host.Services.CreateScope();
        var dbContext = scope.ServiceProvider.GetRequiredService<ManagingDbContext>();
        var canConnect = await dbContext.Database.CanConnectAsync();
        if (!canConnect)
        {
            logger.LogWarning("⚠️  Database connection test failed - Cannot connect to database");
        }
    }
    catch (Exception ex)
    {
        logger.LogError(ex, "❌ Database connection test failed - {Error}", ex.Message);
    }
}

var isBacktestWorkerEnabled = config.GetValue<bool>("WorkerBacktestCompute", false);
var isGeneticWorkerEnabled = config.GetValue<bool>("WorkerGeneticCompute", false);

if (!isBacktestWorkerEnabled)
{
    logger.LogWarning("BacktestComputeWorker is disabled via configuration. No backtest jobs will be processed.");
}

if (!isGeneticWorkerEnabled)
{
    logger.LogWarning("GeneticComputeWorker is disabled via configuration. No genetic jobs will be processed.");
}

try
{
    await host.RunAsync();
}
catch (Exception ex)
{
    logger.LogCritical(ex, "Application terminated unexpectedly");
    SentrySdk.CaptureException(ex);
    throw;
}
finally
{
    SentrySdk.FlushAsync(TimeSpan.FromSeconds(2)).Wait();
}