using AyCode.Core.Compression;
using AyCode.Core.Serializers.Attributes;
using AyCode.Core.Serializers.Binaries;
using AyCode.Core.Tests.Serialization;   // DrainFromAsync extension (test-only, used by benchmark)
using AyCode.Core.Tests.TestModels;
using MemoryPack;
#if !AYCODE_NATIVEAOT
using MessagePack;
using MessagePack.Resolvers;
#endif
using Microsoft.Extensions.Options;
using System.Buffers;
using System.Diagnostics;
using System.IO.Pipelines;
using System.IO.Pipes;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
using System.Text.Json;

using AyCode.Core.Serializers.Console.Benchmarks;

namespace AyCode.Core.Serializers.Console;

/// <summary>
/// Comprehensive benchmark application for all serializers.
/// Compares: AcBinary (all options), MemoryPack, MessagePack, Newtonsoft.Json, System.Text.Json
/// 
/// Usage:
///   dotnet run                    # Run all benchmarks
///   dotnet run -- quick           # Quick mode (fewer iterations)
///   dotnet run -- serialize       # Serialize only
///   dotnet run -- deserialize     # Deserialize only
/// </summary>
public static class Program
{
    // Configuration (constants, mutable state, attribute-flag aggregation) → Configuration.cs
    // BuildAcBinary + GetMemPack helpers → Benchmarks/BenchmarkOptions.cs

    public static void Main(string[] args)
    {
        // Set console encoding to UTF-8 for proper Unicode character display
        System.Console.OutputEncoding = Encoding.UTF8;

        // Setup validation — abort BEFORE any benchmark logic if MemoryPack baseline is invalid.
        // Done early so user is told immediately, not after warmup.
        BenchmarkLoop.ValidateMemoryPackSetup();

        // CLI mode (args provided): run once, parse args, exit. Backward-compatible behaviour.
        if (args.Length > 0)
        {
            if (!TryParseCliArgs(args, out var layer, out var opMode, out var serializerMode))
                return;  // invalid args

            BenchmarkLoop.RunBenchmark(layer, opMode, serializerMode);
            return;
        }

        // Interactive mode (no args): loop the menu so the user doesn't have to restart between runs.
        // Q exits the menu (and the application).
        while (true)
        {
            var selection = Menu.ShowInteractiveMenu();
            if (selection == null) return;  // user pressed Q

            BenchmarkLoop.RunBenchmark(selection.Value.layer, "all", selection.Value.serializerMode);

            System.Console.WriteLine();
            System.Console.WriteLine("─────────────────────────────────────────────────────────────────────");
            System.Console.WriteLine("Returning to menu — press any key to continue, or Q to quit...");
            var key = System.Console.ReadKey(intercept: true);
            if (key.Key == ConsoleKey.Q) return;
            System.Console.WriteLine();
        }
    }

    /// <summary>
    /// Parses CLI arguments into (layer, opMode, serializerMode). Returns <c>false</c> if the args
    /// are invalid; the caller should then exit without running the standard benchmark.
    /// </summary>
    private static bool TryParseCliArgs(string[] args, out string layer, out string opMode, out string serializerMode)
    {
        layer = "all";
        opMode = "all";
        serializerMode = "standard";

        var arg = args[0].ToLower();

        // Quick mode: short warmup, few iterations, small sample count
        if (arg == "quick")
        {
            Configuration.WarmupIterations = 5;
            Configuration.TestIterations = 100;
            Configuration.BenchmarkSamples = 3;
            layer = "all";
        }
        else if (arg is "core" or "comprehensive" or "edge" or "all"
                       or "small" or "medium" or "large" or "repeated" or "deep")
        {
            layer = arg;
        }
        else if (arg is "asyncpipe" or "pipe")
        {
            // AsyncPipe-only mode: streaming I/O isolation across all test data.
            layer = "all";
            serializerMode = "asyncpipe";
        }
        else if (arg is "ser" or "serialize")
        {
            opMode = "serialize";
            layer = "all";
        }
        else if (arg is "des" or "deserialize")
        {
            opMode = "deserialize";
            layer = "all";
        }
        else
        {
            // Backwards compat: unknown arg → treat as layer keyword
            layer = arg;
        }

        return true;
    }

    // RunBenchmark + RunBenchmarksForTestData + CreateSerializers → BenchmarkLoop.cs

    // Serializer implementations (ISerializerBenchmark + 12 concrete benchmark classes) → Benchmarks/

    // Results / output formatters → Output.cs
    // BenchmarkResult DTO → BenchmarkResult.cs

}