using NLog;
using ServerManagerTool.Common.Model;
using ServerManagerTool.Common.Utils;
using ServerManagerTool.Lib;
using ServerManagerTool.Lib.Model;
using ServerManagerTool.Utils;
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Navigation;
using WPFSharp.Globalizer;

namespace ServerManagerTool
{
    /// <summary>
    /// Interaction logic for ModDetailsWindow.xaml
    /// </summary>
    public partial class ModDetailsWindow : Window
    {
        private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        public EventHandler<ProfileEventArgs> SavePerformed;

        private readonly GlobalizedApplication _globalizer = GlobalizedApplication.Instance;
        private readonly ServerProfile _profile = null;

        private WorkshopFilesWindow _workshopFilesWindow = null;

        public static readonly DependencyProperty ModDetailsProperty = DependencyProperty.Register(nameof(ModDetails), typeof(ModDetailList), typeof(ModDetailsWindow), new PropertyMetadata(null));
        public static readonly DependencyProperty ModDetailsChangedProperty = DependencyProperty.Register(nameof(ModDetailsChanged), typeof(bool), typeof(ModDetailsWindow), new PropertyMetadata(false));
        public static readonly DependencyProperty ModDetailsViewProperty = DependencyProperty.Register(nameof(ModDetailsView), typeof(ICollectionView), typeof(ModDetailsWindow), new PropertyMetadata(null));
        public static readonly DependencyProperty ModDetailsFilterStringProperty = DependencyProperty.Register(nameof(ModDetailsFilterString), typeof(string), typeof(ModDetailsWindow), new PropertyMetadata(string.Empty));
        public static readonly DependencyProperty ModDetailsStatusMessageProperty = DependencyProperty.Register(nameof(ModDetailsStatusMessage), typeof(string), typeof(ModDetailsWindow), new PropertyMetadata(string.Empty));
        public static readonly DependencyProperty WorkshopFilesProperty = DependencyProperty.Register(nameof(WorkshopFiles), typeof(WorkshopFileList), typeof(ModDetailsWindow), new PropertyMetadata(null));

        public ModDetailsWindow(ServerProfile profile)
        {
            InitializeComponent();
            WindowUtils.RemoveDefaultResourceDictionary(this, Config.Default.DefaultGlobalizationFile);

            _profile = profile;
            this.Title = string.Format(_globalizer.GetResourceString("ModDetails_ProfileTitle"), _profile?.ProfileName);

            this.DataContext = this;
        }

        public ModDetailList ModDetails
        {
            get { return GetValue(ModDetailsProperty) as ModDetailList; }
            set
            {
                SetValue(ModDetailsProperty, value);

                ModDetailsView = CollectionViewSource.GetDefaultView(ModDetails);
                ModDetailsView.Filter = new Predicate<object>(Filter);

                if (_workshopFilesWindow != null)
                    _workshopFilesWindow.UpdateModDetailsList(value);
            }
        }

        public bool ModDetailsChanged
        {
            get { return (bool)GetValue(ModDetailsChangedProperty); }
            set { SetValue(ModDetailsChangedProperty, value); }
        }

        public ICollectionView ModDetailsView
        {
            get { return GetValue(ModDetailsViewProperty) as ICollectionView; }
            set { SetValue(ModDetailsViewProperty, value); }
        }

        public string ModDetailsFilterString
        {
            get { return (string)GetValue(ModDetailsFilterStringProperty); }
            set { SetValue(ModDetailsFilterStringProperty, value); }
        }

        public string ModDetailsStatusMessage
        {
            get { return (string)GetValue(ModDetailsStatusMessageProperty); }
            set { SetValue(ModDetailsStatusMessageProperty, value); }
        }

        public WorkshopFileList WorkshopFiles
        {
            get { return GetValue(WorkshopFilesProperty) as WorkshopFileList; }
            set { SetValue(WorkshopFilesProperty, value); }
        }


        private async void Window_Loaded(object sender, RoutedEventArgs e)
        {
            try
            {
                WorkshopFiles = await LoadWorkshopItemsAsync(_profile.SOTF_Enabled);
                await LoadModsFromProfile();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Load_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void Window_Closing(object sender, CancelEventArgs e)
        {
            if (ModDetailsChanged)
            {
                var result = MessageBox.Show(_globalizer.GetResourceString("ModDetails_Unsaved_Label"), _globalizer.GetResourceString("ModDetails_Unsaved_Title"), MessageBoxButton.YesNo, MessageBoxImage.Warning);
                if (result == MessageBoxResult.No)
                    e.Cancel = true;
            }
        }

        private async void ModDetails_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            var cursor = this.Cursor;

            try
            {
                ModDetailsChanged = true;

                if (e.Action == NotifyCollectionChangedAction.Add)
                {
                    Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                    await Task.Delay(500);

                    await LoadModsFromList();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Refresh_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        private async void WorkshopFilesWindow_Closed(object sender, EventArgs e)
        {
            _workshopFilesWindow = null;
            this.Activate();

            try
            {
                WorkshopFiles = await LoadWorkshopItemsAsync(_profile.SOTF_Enabled);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Load_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void Mod_RequestNavigate(object sender, RequestNavigateEventArgs e)
        {
            var mod = ((ModDetail)((Hyperlink)e.Source).DataContext);

            Process.Start(new ProcessStartInfo(mod.ModUrl));
            e.Handled = true;
        }

        private void AddMods_Click(object sender, RoutedEventArgs e)
        {
            if (_workshopFilesWindow != null)
                return;

            _workshopFilesWindow = new WorkshopFilesWindow(this, _profile);
            _workshopFilesWindow.Owner = this;
            _workshopFilesWindow.Closed += WorkshopFilesWindow_Closed;
            _workshopFilesWindow.Show();
        }

        private async void LoadMods_Click(object sender, RoutedEventArgs e)
        {
            if (_profile == null)
                return;

            var cursor = this.Cursor;

            try
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                await Task.Delay(500);

                await LoadModsFromServerFolder();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Load_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        private void MoveModDown_Click(object sender, RoutedEventArgs e)
        {
            var mod = ((ModDetail)((Button)e.Source).DataContext);
            ModDetails.MoveDown(mod);
        }

        private void MoveModUp_Click(object sender, RoutedEventArgs e)
        {
            var mod = ((ModDetail)((Button)e.Source).DataContext);
            ModDetails.MoveUp(mod);
        }

        private void OpenModFolder_Click(object sender, RoutedEventArgs e)
        {
            var modDirectory = new DirectoryInfo(Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath));
            Process.Start("explorer.exe", modDirectory.FullName);
        }

        private async void PurgeModsFolder_Click(object sender, RoutedEventArgs e)
        {
            if (_profile == null)
                return;

            var cursor = this.Cursor;

            try
            {
                if (MessageBox.Show(_globalizer.GetResourceString("ModDetails_Purge_Label"), _globalizer.GetResourceString("ModDetails_Purge_Title"), MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
                    return;

                Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                await Task.Delay(500);

                int folderCount;
                int fileCount;

                PurgeModsFromServerFolder(out folderCount, out fileCount);

                var message = _globalizer.GetResourceString("ModDetails_Purge_SuccessLabel");
                message = message.Replace("{folderCount}", folderCount.ToString());
                message = message.Replace("{fileCount}", fileCount.ToString());
                MessageBox.Show(message, _globalizer.GetResourceString("ModDetails_Purge_Title"), MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Purge_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        private async void RefreshMods_Click(object sender, RoutedEventArgs e)
        {
            var cursor = this.Cursor;

            try
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                await Task.Delay(500);

                await LoadModsFromList();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Refresh_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        private async void ReloadMods_Click(object sender, RoutedEventArgs e)
        {
            var cursor = this.Cursor;

            try
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                await Task.Delay(500);

                await LoadModsFromProfile();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Reload_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        private void RemoveMod_Click(object sender, RoutedEventArgs e)
        {
            var mod = ((ModDetail)((Button)e.Source).DataContext);
            ModDetails.Remove(mod);
        }

        private void RemoveAllMods_Click(object sender, RoutedEventArgs e)
        {
            ModDetails.Clear();
        }

        private async void SaveMods_Click(object sender, RoutedEventArgs e)
        {
            var cursor = this.Cursor;

            try
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                await Task.Delay(500);

                string mapString;
                string totalConversionString;
                string modIdString;

                // check if there are any unknown mod types.
                if (ModDetails.AnyUnknownModTypes)
                {
                    if (MessageBox.Show(_globalizer.GetResourceString("ModDetails_Save_UnknownLabel"), _globalizer.GetResourceString("ModDetails_Save_UnknownTitle"), MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
                        return;
                }

                if (ModDetails.GetModStrings(out mapString, out totalConversionString, out modIdString))
                {
                    if (mapString != null)
                        _profile.ServerMap = mapString;
                    else if (_profile.ServerMap.Contains('/'))
                        _profile.ServerMap = string.Empty;

                    // check if a total conversion mod was found in the mod list
                    if (string.IsNullOrWhiteSpace(totalConversionString))
                    {
                        // total conversion mod not found, was it previously set to an official mod?
                        if (!ModUtils.IsOfficialMod(_profile.TotalConversionModId))
                            // total conversion was not previoulsly set to an official mod, clear total conversion mod id
                            _profile.TotalConversionModId = string.Empty;
                    }
                    else
                    {
                        // total conversion mod found, set the found mod id
                        _profile.TotalConversionModId = totalConversionString;
                    }
                    _profile.ServerModIds = modIdString ?? string.Empty;
                }

                await LoadModsFromProfile();
                OnSavePerformed();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_Save_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        private void SaveModDetails_Click(object sender, RoutedEventArgs e)
        {
            var modDetails = string.Empty;
            var delimiter = string.Empty;
            foreach (var modDetail in ModDetails)
            {
                modDetails += $"{delimiter}{modDetail.Title} ({modDetail.ModId}){Environment.NewLine}{modDetail.ModUrl}";
                delimiter = Environment.NewLine;
            }

            var window = new CommandLineWindow(modDetails);
            window.OutputTextWrapping = TextWrapping.NoWrap;
            window.Height = 500;
            window.Title = _globalizer.GetResourceString("ModDetails_Clipboard_SaveTitle");
            window.Owner = Window.GetWindow(this);
            window.ShowDialog();
        }

        private async void WriteTimestampMod_Click(object sender, RoutedEventArgs e)
        {
            var mod = ((ModDetail)((Button)e.Source).DataContext);
            if (mod == null)
                return;

            if (MessageBox.Show(_globalizer.GetResourceString("ModDetails_WriteTimestamp_ConfirmLabel"), _globalizer.GetResourceString("ModDetails_WriteTimestamp_ConfirmTitle"), MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
                return;

            var cursor = this.Cursor;

            try
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = System.Windows.Input.Cursors.Wait);
                await Task.Delay(500);

                var file = ModUtils.GetLatestModTimeFile(_profile?.InstallDirectory, mod.ModId);
                var steamLastUpdated = mod?.TimeUpdated.ToString() ?? string.Empty;
                File.WriteAllText(file, steamLastUpdated);

                mod.PopulateExtended(Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath));
                ModDetailsView?.Refresh();
            }
            catch (DirectoryNotFoundException)
            {
                MessageBox.Show(_globalizer.GetResourceString("ModDetails_WriteTimestamp_FailedLabel"), _globalizer.GetResourceString("ModDetails_WriteTimestamp_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, _globalizer.GetResourceString("ModDetails_WriteTimestamp_FailedTitle"), MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                Application.Current.Dispatcher.Invoke(() => this.Cursor = cursor);
            }
        }

        protected void OnSavePerformed()
        {
            SavePerformed?.Invoke(this, new ProfileEventArgs(_profile));
        }

        public int SelectedRowIndex()
        {
            return ModDetailsGrid.SelectedIndex;
        }

        private async Task LoadModsFromList()
        {
            // build a list of mods to be processed
            var modIdList = new List<string>();

            modIdList.AddRange(ModDetails.Select(m => m.ModId));
            modIdList = ModUtils.ValidateModList(modIdList);

            var response = await Task.Run(() => SteamUtils.GetSteamModDetails(modIdList));
            var workshopFiles = WorkshopFiles;
            var modsRootFolder = Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath);
            var modDetails = ModDetailList.GetModDetails(modIdList, modsRootFolder, workshopFiles, response);

            UpdateModDetailsList(modDetails);

            ModDetailsStatusMessage = modDetails.Count > 0 && response?.publishedfiledetails == null ? _globalizer.GetResourceString("ModDetails_ModDetailFetchFailed_Label") : string.Empty;
            ModDetailsChanged = true;
        }

        private async Task LoadModsFromProfile()
        {
            // build a list of mods to be processed
            var modIdList = new List<string>();

            var serverMapModId = ServerProfile.GetProfileMapModId(_profile);
            if (!string.IsNullOrWhiteSpace(serverMapModId))
                modIdList.Add(serverMapModId);

            if (!string.IsNullOrWhiteSpace(_profile.TotalConversionModId))
                modIdList.Add(_profile.TotalConversionModId);

            modIdList.AddRange(ModUtils.GetModIdList(_profile.ServerModIds));
            modIdList = ModUtils.ValidateModList(modIdList);

            var response = await Task.Run(() => SteamUtils.GetSteamModDetails(modIdList));
            var workshopFiles = WorkshopFiles;
            var modsRootFolder = Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath);
            var modDetails = ModDetailList.GetModDetails(modIdList, modsRootFolder, workshopFiles, response);

            UpdateModDetailsList(modDetails);

            ModDetailsStatusMessage = modDetails.Count > 0 && response?.publishedfiledetails == null ? _globalizer.GetResourceString("ModDetails_ModDetailFetchFailed_Label") : string.Empty;
            ModDetailsChanged = false;
        }

        private async Task LoadModsFromServerFolder()
        {
            // build a list of mods to be processed
            var modIdList = new List<string>();

            var modDirectory = new DirectoryInfo(Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath));
            foreach (var file in modDirectory.GetFiles("*.mod"))
            {
                var modId = Path.GetFileNameWithoutExtension(file.Name);
                if (ModUtils.IsOfficialMod(modId))
                    continue;

                modIdList.Add(modId);
            }
            modIdList = ModUtils.ValidateModList(modIdList);

            var response = await Task.Run(() => SteamUtils.GetSteamModDetails(modIdList));
            var workshopFiles = WorkshopFiles;
            var modsRootFolder = Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath);
            var modDetails = ModDetailList.GetModDetails(modIdList, modsRootFolder, workshopFiles, response);

            UpdateModDetailsList(modDetails);

            ModDetailsStatusMessage = modDetails.Count > 0 && response?.publishedfiledetails == null ? _globalizer.GetResourceString("ModDetails_ModDetailFetchFailed_Label") : string.Empty;
            ModDetailsChanged = true;
        }

        private async Task<WorkshopFileList> LoadWorkshopItemsAsync(bool isSotF)
        {
            WorkshopFileDetailResponse localCache = null;

            await Task.Run(() => {
                var file = Path.Combine(Config.Default.DataDir, isSotF ? Config.Default.WorkshopCacheFile_SotF : Config.Default.WorkshopCacheFile);

                // try to load the cache file.
                localCache = WorkshopFileDetailResponse.Load(file);
            });

            return WorkshopFileList.GetList(localCache);
        }

        private void PurgeModsFromServerFolder(out int folderCount, out int fileCount)
        {
            folderCount = 0;
            fileCount = 0;

            // build a list of mods to be processed
            var modIdList = ModDetails.Select(m => m.ModId).ToList();

            var modDirectory = new DirectoryInfo(Path.Combine(_profile.InstallDirectory, Config.Default.ServerModsRelativePath));
            if (Directory.Exists(modDirectory.FullName))
            {
                foreach (var directory in modDirectory.GetDirectories())
                {
                    var modId = directory.Name;
                    if (ModUtils.IsOfficialMod(modId))
                        continue;

                    if (modIdList.Contains(modId))
                        continue;

                    directory.Delete(true);
                    folderCount++;
                }

                foreach (var file in modDirectory.GetFiles("*.mod"))
                {
                    var modId = Path.GetFileNameWithoutExtension(file.Name);
                    if (ModUtils.IsOfficialMod(modId))
                        continue;

                    if (modIdList.Contains(modId))
                        continue;

                    file.Delete();
                    fileCount++;
                }
            }
        }

        private void UpdateModDetailsList(ModDetailList modDetails)
        {
            if (ModDetails != null)
                ModDetails.CollectionChanged -= ModDetails_CollectionChanged;

            ModDetails = modDetails ?? new ModDetailList();
            if (ModDetails != null)
                ModDetails.CollectionChanged += ModDetails_CollectionChanged;

            ModDetailsView?.Refresh();
        }

        #region Drag and Drop

        public static readonly DependencyProperty DraggedItemProperty = DependencyProperty.Register(nameof(DraggedItem), typeof(ModDetail), typeof(ModDetailsWindow), new PropertyMetadata(null));

        public ModDetail DraggedItem
        {
            get { return (ModDetail)GetValue(DraggedItemProperty); }
            set { SetValue(DraggedItemProperty, value); }
        }

        public bool IsDragging { get; set; }

        private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            // check fi the column is a template column (no drag-n-drop for those column types)
            var cell = WindowUtils.TryFindFromPoint<DataGridCell>((UIElement)sender, e.GetPosition(ModDetailsGrid));
            if (cell == null || cell.Column is DataGridTemplateColumn) return;

            // check if we have a valid row
            var row = WindowUtils.TryFindFromPoint<DataGridRow>((UIElement)sender, e.GetPosition(ModDetailsGrid));
            if (row == null) return;

            // set flag that indicates we're capturing mouse movements
            IsDragging = true;
            DraggedItem = (ModDetail)row.Item;
        }

        private void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (!IsDragging)
            {
                if (popup.IsOpen)
                    popup.IsOpen = false;
                return;
            }

            //get the target item
            var targetItem = (ModDetail)ModDetailsGrid.SelectedItem;

            if (targetItem == null || !ReferenceEquals(DraggedItem, targetItem))
            {
                //get target index
                var targetIndex = ModDetails.IndexOf(targetItem);

                //move source at the target's location
                ModDetails.Move(DraggedItem, targetIndex);

                //select the dropped item
                ModDetailsGrid.SelectedItem = DraggedItem;
            }

            //reset
            ResetDragDrop();
        }

        private void OnMouseMove(object sender, MouseEventArgs e)
        {
            if (!IsDragging || e.LeftButton != MouseButtonState.Pressed)
            {
                if (popup.IsOpen)
                    popup.IsOpen = false;
                return;
            }

            // display the popup if it hasn't been opened yet
            if (!popup.IsOpen)
            {
                // switch to read-only mode
                ModDetailsGrid.IsReadOnly = true;

                // make sure the popup is visible
                popup.IsOpen = true;
            }

            var popupSize = new Size(popup.ActualWidth, popup.ActualHeight);
            popup.PlacementRectangle = new Rect(e.GetPosition(this), popupSize);

            // make sure the row under the grid is being selected
            var position = e.GetPosition(ModDetailsGrid);
            var row = WindowUtils.TryFindFromPoint<DataGridRow>(ModDetailsGrid, position);
            if (row != null) ModDetailsGrid.SelectedItem = row.Item;
        }

        private void ResetDragDrop()
        {
            IsDragging = false;
            popup.IsOpen = false;
            ModDetailsGrid.IsReadOnly = false;
        }

        #endregion

        #region Filtering
        private void FilterMods_Click(object sender, RoutedEventArgs e)
        {
            ModDetailsView?.Refresh();
        }

        public bool Filter(object obj)
        {
            var data = obj as ModDetail;
            if (data == null)
                return false;

            var filterString = ModDetailsFilterString.ToLower();

            if (string.IsNullOrWhiteSpace(filterString))
                return true;

            return data.ModId.Contains(filterString) || data.TitleFilterString.Contains(filterString);
        }
        #endregion
    }
}