using System;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Avalonia.Media;
using CommunityToolkit.Mvvm.ComponentModel;
using Nebula.Launcher.ViewHelper;
using Nebula.Launcher.Views.Popup;
using Nebula.Shared.Models;
using Nebula.Shared.Services;

namespace Nebula.Launcher.ViewModels;

[ViewModelRegister(isSingleton:false)]
public partial class ServerEntryModelView : ViewModelBase
{
    private readonly AuthService _authService = default!;
    private readonly ContentService _contentService = default!;
    private readonly CancellationService _cancellationService = default!;
    private readonly DebugService _debugService = default!;
    private readonly RunnerService _runnerService = default!;
    private readonly PopupMessageService _popupMessageService;

    public bool RunVisible => Process == null;

    public ServerHubInfo ServerHubInfo { get; set; } = default!;


    private Process? _p;
    private Process? Process
    {
        get { return _p; }
        set
        {
            _p = value;
            OnPropertyChanged(nameof(RunVisible));
        }
    }



    public LogPopupModelView CurrLog;

    public ServerEntryModelView() : base()
    {
        CurrLog = GetViewModel<LogPopupModelView>();
    }

    public ServerEntryModelView(
        IServiceProvider serviceProvider,
        AuthService authService, 
        ContentService contentService, 
        CancellationService cancellationService,
        DebugService debugService, 
        RunnerService runnerService, PopupMessageService popupMessageService
        ) : base(serviceProvider)
    {
        _authService = authService;
        _contentService = contentService;
        _cancellationService = cancellationService;
        _debugService = debugService;
        _runnerService = runnerService;
        _popupMessageService = popupMessageService;

        CurrLog = GetViewModel<LogPopupModelView>();
    }

    public void RunInstance()
    {
        Task.Run(RunAsync);
    }

    public async Task RunAsync()
    {
         try
         {
             var authProv = _authService.SelectedAuth;

             var buildInfo =
                 await _contentService.GetBuildInfo(new RobustUrl(ServerHubInfo.Address), _cancellationService.Token);
            
             using (var loadingContext = GetViewModel<LoadingContextViewModel>())
             {
                 loadingContext.LoadingName = "Loading instance...";
                 ((ILoadingHandler)loadingContext).AppendJob();
                 
                 _popupMessageService.Popup(loadingContext);
                 
                 
                 await _runnerService.PrepareRun(buildInfo, loadingContext, _cancellationService.Token);

                 Process = Process.Start(new ProcessStartInfo()
                 {
                     FileName = "dotnet.exe",
                     Arguments = "./Nebula.Runner.dll",
                     Environment =
                     {
                         { "ROBUST_AUTH_USERID", authProv?.UserId.ToString() },
                         { "ROBUST_AUTH_TOKEN", authProv?.Token.Token },
                         { "ROBUST_AUTH_SERVER", authProv?.AuthLoginPassword.AuthServer },
                         { "ROBUST_AUTH_PUBKEY", buildInfo.BuildInfo.Auth.PublicKey },
                         { "GAME_URL", ServerHubInfo.Address },
                         { "AUTH_LOGIN", authProv?.AuthLoginPassword.Login },
                     },
                     CreateNoWindow = true,
                     UseShellExecute = false,
                     RedirectStandardOutput = true,
                     RedirectStandardError = true, 
                     StandardOutputEncoding = Encoding.UTF8
                 });
                 
                 ((ILoadingHandler)loadingContext).AppendResolvedJob();
             }
            
             if (Process is null)
             {
                 return;
             }
             
             Process.EnableRaisingEvents = true;
            
             Process.BeginOutputReadLine();
             Process.BeginErrorReadLine();

             Process.OutputDataReceived += OnOutputDataReceived;
             Process.ErrorDataReceived += OnErrorDataReceived;

             Process.Exited += OnExited;
         }
         catch (TaskCanceledException e)
         {
             _popupMessageService.Popup("Task canceled");
         }
         catch (Exception e)
         {
             _popupMessageService.Popup(e);
         }
    }

    private void OnExited(object? sender, EventArgs e)
    {
        if (Process is null)
        {
            return;
        }
        
        Process.OutputDataReceived -= OnOutputDataReceived;
        Process.ErrorDataReceived -= OnErrorDataReceived;
        Process.Exited -= OnExited;
        
        _debugService.Log("PROCESS EXIT WITH CODE " + Process.ExitCode);
        
        Process.Dispose();
        Process = null;
    }

    private void OnErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        if (e.Data != null)
        {
            _debugService.Error(e.Data);
            CurrLog.Append(e.Data);
        }
    }

    private void OnOutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        if (e.Data != null)
        {
            _debugService.Log(e.Data);
            CurrLog.Append(e.Data);
        }
    }


    public void ReadLog()
    {
        _popupMessageService.Popup(CurrLog);
    }

    public void StopInstance()
    {
        Process?.CloseMainWindow();
    }
    
    static string FindDotnetPath()
    {
        var pathEnv = Environment.GetEnvironmentVariable("PATH");
        var paths = pathEnv?.Split(System.IO.Path.PathSeparator);
        if (paths != null)
        {
            foreach (var path in paths)
            {
                var dotnetPath = System.IO.Path.Combine(path, "dotnet");
                if (System.IO.File.Exists(dotnetPath))
                {
                    return dotnetPath;
                }
            }
        }

        throw new Exception("Dotnet not found!");
    }
}

public sealed class LogInfo
{
    public string Category { get; set; } =  "LOG";
    public IBrush CategoryColor { get; set; } = Brush.Parse("#424242");
    public string Message { get; set; } = "";

    public static LogInfo FromString(string input)
    {
        var matches = Regex.Matches(input, @"(\[(?<c>.*)\] (?<m>.*))|(?<m>.*)");
        string category = "All";

        if( matches[0].Groups.TryGetValue("c", out var c))
        {
            category = c.Value;
        }

        var color = Brush.Parse("#444444");

        switch (category)
        {
            case "DEBG":
                color = Brush.Parse("#2436d4");
                break;
            case "ERRO":
                color = Brush.Parse("#d42436");
                break;
            case "INFO":
                color = Brush.Parse("#0ab3c9");
                break;
        }
            
        var message = matches[0].Groups["m"].Value;
        return new LogInfo()
        {
            Category = category, Message = message, CategoryColor = color
        };
    }
}

[ViewModelRegister(typeof(LogPopupView), false)]
public sealed class LogPopupModelView : PopupViewModelBase
{
    public LogPopupModelView() : base()
    {
        Logs.Add(new LogInfo()
        {
            Category = "DEBG", Message = "MEOW MEOW TEST"
        });
        
        Logs.Add(new LogInfo()
        {
            Category = "ERRO", Message = "MEOW MEOW TEST 11\naaaaa"
        });
    }

    public LogPopupModelView(IServiceProvider serviceProvider) : base(serviceProvider)
    {
    }
    
    public override string Title => "LOG";

    public ObservableCollection<LogInfo> Logs { get; } = new();

    public void Append(string str)
    {
        Logs.Add(LogInfo.FromString(str));
    }
}