using System;
using System.Diagnostics;
using System.IO;
using System.Security.Principal;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Win32.TaskScheduler;
using Pingerino.Services.Interfaces;

namespace Pingerino.Services
{
    public class SystemService : ISystemService
    {
        private readonly ILoggingService _logger;
        private bool _disposed;

        public SystemService(ILoggingService logger)
        {
            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        public async System.Threading.Tasks.Task<bool> CleanTemporaryFilesAsync(IProgress<int> progress = null, CancellationToken cancellationToken = default)
        {
            try
            {
                _logger.LogInformation("Starting temporary files cleanup");
                
                var folders = new[]
                {
                    Environment.ExpandEnvironmentVariables(@"%systemroot%\temp"),
                    Environment.ExpandEnvironmentVariables(@"%systemroot%\Prefetch"),
                    Environment.ExpandEnvironmentVariables(@"%userprofile%\LocalS~1\Temp"),
                    Environment.ExpandEnvironmentVariables(@"%userprofile%\AppData\Local\Temp")
                };

                int totalSteps = folders.Length * 2;
                int currentStep = 0;

                foreach (var folder in folders)
                {
                    if (cancellationToken.IsCancellationRequested)
                        return false;

                    await CleanFolderAsync(folder, progress, currentStep, totalSteps);
                    currentStep += 2;
                }

                progress?.Report(100);
                _logger.LogInformation("Temporary files cleanup completed");
                return true;
            }
            catch (Exception ex)
            {
                _logger.LogError("Error during temporary files cleanup", ex);
                return false;
            }
        }

        private async System.Threading.Tasks.Task CleanFolderAsync(string folderPath, IProgress<int> progress, int currentStep, int totalSteps)
        {
            try
            {
                if (!Directory.Exists(folderPath))
                    return;

                var dirInfo = new DirectoryInfo(folderPath);

                // Delete files
                await System.Threading.Tasks.Task.Run(() =>
                {
                    foreach (var file in dirInfo.GetFiles())
                    {
                        try
                        {
                            file.Delete();
                        }
                        catch
                        {
                            // Ignore individual file deletion errors
                        }
                    }
                });

                progress?.Report((currentStep + 1) * 100 / totalSteps);

                // Delete directories
                await System.Threading.Tasks.Task.Run(() =>
                {
                    foreach (var dir in dirInfo.GetDirectories())
                    {
                        try
                        {
                            dir.Delete(true);
                        }
                        catch
                        {
                            // Ignore individual directory deletion errors
                        }
                    }
                });

                progress?.Report((currentStep + 2) * 100 / totalSteps);
            }
            catch (Exception ex)
            {
                _logger.LogWarning($"Error cleaning folder {folderPath}: {ex.Message}");
            }
        }

        public async System.Threading.Tasks.Task<bool> CreateStartupTaskAsync(string taskName, string executablePath)
        {
            try
            {
                using (var ts = new TaskService())
                {
                    var td = ts.NewTask();
                
                td.RegistrationInfo.Description = taskName;
                td.Principal.RunLevel = TaskRunLevel.Highest;
                td.Principal.LogonType = TaskLogonType.InteractiveToken;
                td.Triggers.Add(new LogonTrigger());

                var execAction = new ExecAction(executablePath)
                {
                    WorkingDirectory = Path.GetDirectoryName(executablePath)
                };
                td.Actions.Add(execAction);

                var currentUserName = WindowsIdentity.GetCurrent().Name;
                ts.RootFolder.RegisterTaskDefinition(taskName, td, TaskCreation.CreateOrUpdate, 
                    currentUserName, null, TaskLogonType.InteractiveToken);

                    _logger.LogInformation($"Startup task '{taskName}' created successfully");
                    return await System.Threading.Tasks.Task.FromResult(true);
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"Error creating startup task '{taskName}'", ex);
                return await System.Threading.Tasks.Task.FromResult(false);
            }
        }

        public async System.Threading.Tasks.Task<bool> RemoveStartupTaskAsync(string taskName)
        {
            try
            {
                using (var ts = new TaskService())
                {
                    ts.RootFolder.DeleteTask(taskName, false);
                
                    _logger.LogInformation($"Startup task '{taskName}' removed successfully");
                    return await System.Threading.Tasks.Task.FromResult(true);
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"Error removing startup task '{taskName}'", ex);
                return await System.Threading.Tasks.Task.FromResult(false);
            }
        }

        public async System.Threading.Tasks.Task<bool> IsStartupTaskExistsAsync(string taskName)
        {
            try
            {
                using (var ts = new TaskService())
                {
                    var existingTask = ts.GetTask(taskName);
                    return await System.Threading.Tasks.Task.FromResult(existingTask != null);
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"Error checking startup task '{taskName}'", ex);
                return await System.Threading.Tasks.Task.FromResult(false);
            }
        }

        public void OpenNetworkAdaptersControl()
        {
            try
            {
                Process.Start("control", "ncpa.cpl");
                _logger.LogInformation("Opened network adapters control panel");
            }
            catch (Exception ex)
            {
                _logger.LogError("Error opening network adapters control panel", ex);
            }
        }

        public async System.Threading.Tasks.Task<bool> RunExternalScriptAsync(string scriptPath)
        {
            try
            {
                if (!File.Exists(scriptPath))
                {
                    _logger.LogWarning($"Script not found: {scriptPath}");
                    return false;
                }

                var processInfo = new ProcessStartInfo
                {
                    FileName = scriptPath,
                    UseShellExecute = true
                };

                using (var process = Process.Start(processInfo))
                {
                    if (process == null)
                    {
                        _logger.LogError("Failed to start external script");
                        return false;
                    }

                    process.WaitForExit();
                
                    var success = process.ExitCode == 0;
                    _logger.LogInformation($"External script execution completed with exit code: {process.ExitCode}");
                    return success;
                }
            }
            catch (Exception ex)
            {
                _logger.LogError($"Error running external script: {scriptPath}", ex);
                return false;
            }
        }

        public void Dispose()
        {
            if (_disposed) return;
            _disposed = true;
        }
    }
}