using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using EngineeringSync.Domain.Entities;
using EngineeringSync.TrayApp.Services;

namespace EngineeringSync.TrayApp.ViewModels;

public partial class ProjectManagementViewModel(ApiClient api) : ObservableObject
{
    [ObservableProperty] private ObservableCollection<ProjectConfig> _projects = [];
    [ObservableProperty] private ProjectConfig? _selectedProject;
    [ObservableProperty] private bool _isEditing;
    [ObservableProperty] private string _editName = string.Empty;
    [ObservableProperty] private string _editEngineeringPath = string.Empty;
    [ObservableProperty] private string _editSimulationPath = string.Empty;
    [ObservableProperty] private string _editFileExtensions = ".jt,.cojt,.xml";
    [ObservableProperty] private bool _editIsActive = true;
    [ObservableProperty] private bool _editBackupEnabled = true;
    [ObservableProperty] private bool _editBackupUseCustomPath = false;
    [ObservableProperty] private string _editBackupCustomPath = string.Empty;
    [ObservableProperty] private int _editMaxBackupsPerFile = 0;
    [ObservableProperty] private bool _isNewProject;
    [ObservableProperty] private string _statusMessage = string.Empty;
    [ObservableProperty] private string _scanStatus = string.Empty;
    [ObservableProperty] private ObservableCollection<ScanResultDto> _scanResults = [];
    public bool HasScanResults => ScanResults.Count > 0;

    [RelayCommand]
    public async Task LoadAsync()
    {
        var projects = await api.GetProjectsAsync() ?? [];
        Projects = new ObservableCollection<ProjectConfig>(projects);
    }

    [RelayCommand]
    public void StartNewProject()
    {
        SelectedProject = null;
        IsNewProject = true;
        IsEditing = true;
        EditName = string.Empty;
        EditEngineeringPath = string.Empty;
        EditSimulationPath = string.Empty;
        EditFileExtensions = ".jt,.cojt,.xml";
        EditIsActive = true;
        EditBackupEnabled = true;
        EditBackupUseCustomPath = false;
        EditBackupCustomPath = string.Empty;
        EditMaxBackupsPerFile = 0;
    }

    [RelayCommand]
    public void EditProject(ProjectConfig? project)
    {
        if (project is null)
        {
            System.Windows.MessageBox.Show(
                "Bitte zuerst ein Projekt auswählen.",
                "EngineeringSync",
                System.Windows.MessageBoxButton.OK,
                System.Windows.MessageBoxImage.Information);
            return;
        }
        SelectedProject = project;
        IsNewProject = false;
        IsEditing = true;
        EditName = project.Name;
        EditEngineeringPath = project.EngineeringPath;
        EditSimulationPath = project.SimulationPath;
        EditFileExtensions = project.FileExtensions;
        EditIsActive = project.IsActive;
        EditBackupEnabled = project.BackupEnabled;
        EditBackupUseCustomPath = project.BackupPath is not null;
        EditBackupCustomPath = project.BackupPath ?? string.Empty;
        EditMaxBackupsPerFile = project.MaxBackupsPerFile;
    }

    [RelayCommand]
    public async Task SaveAsync()
    {
        if (string.IsNullOrWhiteSpace(EditName))
        {
            StatusMessage = "Name darf nicht leer sein.";
            return;
        }
        try
        {
            if (IsNewProject)
                await api.CreateProjectAsync(new CreateProjectDto(
                    EditName, EditEngineeringPath, EditSimulationPath, EditFileExtensions, EditIsActive,
                    EditBackupEnabled,
                    EditBackupUseCustomPath ? EditBackupCustomPath : null,
                    EditMaxBackupsPerFile));
            else
                await api.UpdateProjectAsync(SelectedProject!.Id, new UpdateProjectDto(
                    EditName, EditEngineeringPath, EditSimulationPath, EditFileExtensions, EditIsActive,
                    EditBackupEnabled,
                    EditBackupUseCustomPath ? EditBackupCustomPath : null,
                    EditMaxBackupsPerFile));

            IsEditing = false;
            await LoadAsync();
            StatusMessage = IsNewProject ? "Projekt erstellt." : "Projekt aktualisiert.";
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine($"[TrayApp] Save Fehler: {ex}");
            StatusMessage = $"Fehler: {ex.Message}";
        }
    }

    [RelayCommand]
    public void Cancel() => IsEditing = false;

    [RelayCommand]
    public async Task DeleteAsync(ProjectConfig? project)
    {
        if (project is null)
        {
            System.Windows.MessageBox.Show(
                "Bitte zuerst ein Projekt auswählen.",
                "EngineeringSync",
                System.Windows.MessageBoxButton.OK,
                System.Windows.MessageBoxImage.Information);
            return;
        }
        try
        {
            await api.DeleteProjectAsync(project.Id);
            await LoadAsync();
            StatusMessage = "Projekt gelöscht.";
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine($"[TrayApp] Save Fehler: {ex}");
            StatusMessage = $"Fehler: {ex.Message}";
        }
    }

    [RelayCommand]
    public async Task ScanFoldersAsync()
    {
        if (string.IsNullOrWhiteSpace(EditEngineeringPath) || string.IsNullOrWhiteSpace(EditSimulationPath))
        {
            ScanStatus = "Bitte beide Ordnerpfade angeben.";
            return;
        }

        if (!System.IO.Directory.Exists(EditEngineeringPath))
        {
            ScanStatus = $"Engineering-Ordner existiert nicht: {EditEngineeringPath}";
            return;
        }
        if (!System.IO.Directory.Exists(EditSimulationPath))
        {
            ScanStatus = $"Simulations-Ordner existiert nicht: {EditSimulationPath}";
            return;
        }

        try
        {
            ScanStatus = "Wird gescannt...";
            ScanResults.Clear();

            var results = await api.ScanFoldersAsync(EditEngineeringPath, EditSimulationPath, EditFileExtensions);
            if (results is null || results.Count == 0)
            {
                ScanStatus = "Keine Unterschiede gefunden - Ordner sind synchron.";
            }
            else
            {
                ScanStatus = $"{results.Count} Unterschied(e) gefunden:";
                foreach (var r in results)
                    ScanResults.Add(r);
            }
        }
        catch (Exception ex)
        {
            ScanStatus = $"Scan-Fehler: {ex.Message}";
        }
    }
}