using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Ookii.Dialogs.Wpf;
using S7Explorer.Helpers;
using S7Explorer.Models;
using S7Explorer.Services;
using S7Explorer.Services;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Threading.Tasks;
using System.Windows;

namespace S7Explorer.ViewModels
{
    public partial class MainViewModel : ViewModelBase
    {
        private readonly ProjectService _projectService;
        private readonly ExportService _exportService;
        private readonly SearchHelper _searchHelper;

        [ObservableProperty]
        private ProjectStructure? _projectStructure;

        [ObservableProperty]
        private ProjectItem? _selectedItem;

        [ObservableProperty]
        private object? _selectedItemDetails;

        [ObservableProperty]
        private string _projectPath = string.Empty;

        [ObservableProperty]
        private bool _isProjectLoaded;

        [ObservableProperty]
        private string _searchText = string.Empty;

        [ObservableProperty]
        private bool _isCaseSensitive;

        [ObservableProperty]
        private bool _useRegex;

        [ObservableProperty]
        private ObservableCollection<LogEntry> _logEntries = new();

        [ObservableProperty]
        private ExportSettings _exportSettings = new();

        [ObservableProperty]
        private bool _isLoading;

        public MainViewModel()
        {
            _projectService = new ProjectService();
            _exportService = new ExportService();
            _searchHelper = new SearchHelper();

            // Initialize log entries collection
            LogEntries = LogService.Instance.Logs;

            // Initialize export settings
            ExportSettings.ExportPath = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
                "S7Documentation.txt");
        }

        partial void OnSelectedItemChanged(ProjectItem? value)
        {
            SelectedItemDetails = value?.GetDetailsObject();
        }

        [RelayCommand]
        private async Task LoadProject()
        {
            try
            {
                var dialog = new VistaOpenFileDialog
                {
                    Title = "Open Siemens S7 Project",
                    Filter = "S7 Projects (*.s7p)|*.s7p|All files (*.*)|*.*",
                    CheckFileExists = true
                };

                if (dialog.ShowDialog() == true)
                {
                    ProjectPath = dialog.FileName;
                    await LoadProjectFromPath(ProjectPath);
                }
            }
            catch (Exception ex)
            {
                _logService.LogError(ex);
                MessageBox.Show($"Error loading project: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        [RelayCommand]
        private async Task ReloadProject()
        {
            if (string.IsNullOrEmpty(ProjectPath) || !File.Exists(ProjectPath))
            {
                _logService.LogWarning("No project loaded to reload");
                return;
            }

            await LoadProjectFromPath(ProjectPath);
        }

        private async Task LoadProjectFromPath(string path)
        {
            try
            {
                IsLoading = true;

                // Load the project
                _logService.LogInfo($"Loading project from {path}");
                ProjectStructure = await _projectService.LoadProjectAsync(path);

                if (ProjectStructure != null)
                {
                    IsProjectLoaded = true;
                    _logService.LogInfo("Project loaded successfully");
                }
                else
                {
                    IsProjectLoaded = false;
                    _logService.LogError("Failed to load project");
                    MessageBox.Show("Failed to load project", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
                }
            }
            catch (Exception ex)
            {
                _logService.LogError(ex);
                MessageBox.Show($"Error loading project: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                IsLoading = false;
            }
        }

        [RelayCommand]
        private void Search()
        {
            if (!IsProjectLoaded || ProjectStructure == null)
            {
                _logService.LogWarning("No project loaded to search");
                return;
            }

            if (string.IsNullOrWhiteSpace(SearchText))
            {
                _logService.LogWarning("No search text specified");
                return;
            }

            try
            {
                var results = _searchHelper.Search(ProjectStructure, SearchText, IsCaseSensitive, UseRegex);

                if (results.Count == 0)
                {
                    _logService.LogInfo($"No results found for '{SearchText}'");
                    MessageBox.Show($"No results found for '{SearchText}'", "Search Results", MessageBoxButton.OK, MessageBoxImage.Information);
                    return;
                }

                // Show search results dialog
                ShowSearchResults(results);
            }
            catch (Exception ex)
            {
                _logService.LogError(ex);
                MessageBox.Show($"Error during search: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void ShowSearchResults(List<SearchResult> results)
        {
            // In a full implementation, this would show a dialog or window with search results
            // For demonstration, we'll just select the first result and expand to it
            if (results.Count > 0)
            {
                var firstResult = results[0];
                TreeViewHelper.ExpandToItem(firstResult.Item);
                SelectedItem = firstResult.Item;

                _logService.LogInfo($"Found {results.Count} results, highlighted first result");
                MessageBox.Show($"Found {results.Count} results", "Search Results", MessageBoxButton.OK, MessageBoxImage.Information);
            }
        }

        [RelayCommand]
        private async Task ExportDocumentation()
        {
            if (!IsProjectLoaded || ProjectStructure == null)
            {
                _logService.LogWarning("No project loaded to export");
                return;
            }

            try
            {
                // Show export settings dialog
                bool proceed = ShowExportSettings();

                if (!proceed)
                    return;

                IsLoading = true;

                // Export the documentation
                bool success = await _exportService.ExportProjectAsync(ProjectStructure, ExportSettings);

                if (success)
                {
                    _logService.LogInfo($"Documentation exported to {ExportSettings.ExportPath}");
                    MessageBox.Show($"Documentation exported to {ExportSettings.ExportPath}", "Export Complete", MessageBoxButton.OK, MessageBoxImage.Information);
                }
                else
                {
                    _logService.LogError("Failed to export documentation");
                    MessageBox.Show("Failed to export documentation", "Export Failed", MessageBoxButton.OK, MessageBoxImage.Error);
                }
            }
            catch (Exception ex)
            {
                _logService.LogError(ex);
                MessageBox.Show($"Error exporting documentation: {ex.Message}", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                IsLoading = false;
            }
        }

        private bool ShowExportSettings()
        {
            // Show file save dialog for export path
            var dialog = new VistaSaveFileDialog
            {
                Title = "Export Documentation",
                Filter = GetExportFilter(),
                FileName = Path.GetFileName(ExportSettings.ExportPath),
                InitialDirectory = Path.GetDirectoryName(ExportSettings.ExportPath)
            };

            if (dialog.ShowDialog() == true)
            {
                ExportSettings.ExportPath = dialog.FileName;

                // Determine export format from file extension
                string extension = Path.GetExtension(dialog.FileName).ToLower();
                ExportSettings.ExportFormat = extension switch
                {
                    ".md" => ExportFormat.MarkDown,
                    ".html" => ExportFormat.HTML,
                    ".json" => ExportFormat.JSON,
                    _ => ExportFormat.PlainText
                };

                return true;
            }

            return false;
        }

        private string GetExportFilter()
        {
            return "Text Files (*.txt)|*.txt|" +
                   "Markdown Files (*.md)|*.md|" +
                   "HTML Files (*.html)|*.html|" +
                   "JSON Files (*.json)|*.json|" +
                   "All Files (*.*)|*.*";
        }

        [RelayCommand]
        private void ExpandAll()
        {
            if (ProjectStructure != null)
            {
                TreeViewHelper.ExpandAll(ProjectStructure);
                _logService.LogInfo("Expanded all tree nodes");
            }
        }

        [RelayCommand]
        private void CollapseAll()
        {
            if (ProjectStructure != null)
            {
                TreeViewHelper.CollapseAll(ProjectStructure);
                _logService.LogInfo("Collapsed all tree nodes");
            }
        }

        [RelayCommand]
        private void ClearLog()
        {
            LogEntries.Clear();
            _logService.LogInfo("Log cleared");
        }
    }
}