using System;
using System.Diagnostics;
using System.IO;
using System.Net.Sockets;
using System.Threading.Tasks;
using Toak.Configuration;
using Toak.Api;
using Toak.Core.Interfaces;
using Toak.Audio;
using Toak.IO;

namespace Toak.Core;

public static class DaemonService
{
    public static string GetSocketPath()
    {
        return Constants.Paths.GetSocketPath();
    }

    private static FileStream? _lockFile;

    public static async Task StartAsync(bool verbose)
    {
        var lockPath = Constants.Paths.DaemonLockFile;
        try
        {
            Directory.CreateDirectory(Path.GetDirectoryName(lockPath)!);
            _lockFile = new FileStream(lockPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
        }
        catch (IOException)
        {
            Console.WriteLine("Toak daemon is already running.");
            return;
        }

        Logger.Verbose = verbose;
        var socketPath = GetSocketPath();

        if (File.Exists(socketPath))
        {
            try { File.Delete(socketPath); } catch { }
        }

        var configManager = new ConfigManager();
        var config = configManager.LoadConfig();
        if (string.IsNullOrWhiteSpace(config.GroqApiKey))
        {
            Console.WriteLine("Groq API Key is not configured. Run 'toak onboard'.");
            return;
        }

        var stateTracker = new StateTracker();
        var notifications = new Notifications();

        var speechClient = new OpenAiCompatibleClient(config.GroqApiKey);
        ILlmClient llmClient;
        if (config.LlmProvider == "together")
        {
            llmClient = new OpenAiCompatibleClient(config.TogetherApiKey, "https://api.together.xyz/v1/", config.ReasoningEffort);
        }
        else
        {
            llmClient = new OpenAiCompatibleClient(config.GroqApiKey, "https://api.groq.com/openai/v1/", config.ReasoningEffort);
        }

        IAudioRecorder recorder = config.AudioBackend == "ffmpeg" 
            ? new FfmpegAudioRecorder(stateTracker, notifications) 
            : new AudioRecorder(stateTracker, notifications);

        var orchestrator = new TranscriptionOrchestrator(
            speechClient, 
            llmClient, 
            configManager, 
            recorder, 
            notifications, 
            new TextInjector(notifications), 
            new HistoryManager(), 
            new ClipboardManager(notifications), 
            stateTracker
        );

        using var socket = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified);
        var endPoint = new UnixDomainSocketEndPoint(socketPath);
        
        try
        {
            socket.Bind(endPoint);
            socket.Listen(10);
            Logger.LogDebug($"Daemon listening on {socketPath}");
            Console.WriteLine($"Toak daemon started, listening on {socketPath}");

            while (true)
            {
                var client = await socket.AcceptAsync();
                _ = Task.Run(() => HandleClientAsync(client, orchestrator, stateTracker));
            }
        }
        catch (Exception ex)
        {
            Logger.LogDebug($"Daemon error: {ex.Message}");
        }
        finally
        {
            if (File.Exists(socketPath))
            {
                File.Delete(socketPath);
            }
        }
    }

    private static async Task HandleClientAsync(Socket client, ITranscriptionOrchestrator orchestrator, IRecordingStateTracker stateTracker)
    {
        try
        {
            var buffer = new byte[3];
            int bytesRead = await client.ReceiveAsync(buffer, SocketFlags.None);
            if (bytesRead > 0)
            {
                byte cmd = buffer[0];
                bool pipeToStdout = bytesRead > 1 && buffer[1] == 1;
                bool copyToClipboard = bytesRead > 2 && buffer[2] == 1;

                if (cmd == 1) // START
                {
                    await orchestrator.ProcessStartRecordingAsync();
                }
                else if (cmd == 2) // STOP
                {
                    await orchestrator.ProcessStopRecordingAsync(client, pipeToStdout, copyToClipboard);
                }
                else if (cmd == 3) // ABORT
                {
                    orchestrator.ProcessAbortAsync();
                }
                else if (cmd == 4) // TOGGLE
                {
                    if (stateTracker.IsRecording())
                        await orchestrator.ProcessStopRecordingAsync(client, pipeToStdout, copyToClipboard);
                    else
                        await orchestrator.ProcessStartRecordingAsync();
                }
            }
        }
        catch (Exception ex)
        {
            Logger.LogDebug($"HandleClient error: {ex.Message}");
        }
        finally
        {
            client.Close();
        }
    }
}