using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.Core.Postable;
using InABox.DynamicGrid;
using InABox.Wpf;
using InABox.WPF;
using Syncfusion.UI.Xaml.Diagram;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;

namespace PRSDesktop;

public class PullResultGrid<T> : DynamicItemsListGrid<T>
    where T : BaseObject, IPostable, new()
{
    private static readonly BitmapImage tick = InABox.Wpf.Resources.tick.AsBitmapImage();
    private static readonly BitmapImage link = PRSDesktop.Resources.link.AsBitmapImage();
    private static readonly BitmapImage refresh = PRSDesktop.Resources.refresh.AsBitmapImage();

    private class ResultItem(PullResultItem<T> item, bool selected)
    {
        public PullResultItem<T> Item { get; set; } = item;

        public bool Selected { get; set; } = selected;
    }

    public bool CanSave => _items.Any(x => x.Selected);

    private List<ResultItem> _items;

    public IEnumerable<PullResultItem<T>> Selected => _items.Where(x => x.Selected).Select(x => x.Item);

    protected DynamicGridCustomColumnsComponent<T> ColumnsComponent;

    public PullResultGrid(IPullResult<T> result)
    {
        _items = result.PulledEntities.Where(x => x.Item.PostedStatus != PostedStatus.PostFailed).Select(x => new ResultItem(x, false)).ToList();
        Items = _items.Select(x => x.Item.Item).ToList();

        ColumnsComponent = new DynamicGridCustomColumnsComponent<T>(this, typeof(T).Name);
    }

    protected override DynamicGridColumns LoadColumns()
    {
        return ColumnsComponent.LoadColumns();
    }

    protected override void SaveColumns(DynamicGridColumns columns)
    {
        ColumnsComponent.SaveColumns(columns);
    }

    protected override void LoadColumnsMenu(ContextMenu menu)
    {
        ColumnsComponent.LoadColumnsMenu(menu);
    }

    private ResultItem? GetItem(CoreRow? row)
    {
        return row is not null ? _items[_recordmap[row].Index] : null;
    }

    protected override void Init()
    {
        base.Init();

        ActionColumns.Add(new DynamicImageColumn(Selected_Image, Selected_Click) { Position = DynamicActionColumnPosition.Start });
        ActionColumns.Add(new DynamicImageColumn(Action_Image)
        {
            Position = DynamicActionColumnPosition.Start,
            ToolTip = Action_ToolTip
        });
    }

    private FrameworkElement? Action_ToolTip(DynamicActionColumn column, CoreRow? row)
    {
        var item = GetItem(row);
        if(item is null)
        {
            return column.TextToolTip("Item Import Action");
        }
        else if(item.Item.Type == PullResultType.Linked)
        {
            return column.TextToolTip("Existing PRS item linked to external item.");
        }
        else if(item.Item.Type == PullResultType.Updated)
        {
            return column.TextToolTip("Existing PRS item updated to external item.");
        }
        else if(item.Item.Type == PullResultType.New)
        {
            return column.TextToolTip("New item imported.");
        }
        else
        {
            return null;
        }
    }

    private BitmapImage? Action_Image(CoreRow? row)
    {
        var item = GetItem(row);
        if(item is null)
        {
            return null;
        }
        else if(item.Item.Type == PullResultType.Linked)
        {
            return link;
        }
        else if(item.Item.Type == PullResultType.Updated)
        {
            return refresh;
        }
        else
        {
            return null;
        }
    }

    private BitmapImage? Selected_Image(CoreRow? row)
    {
        var item = GetItem(row);
        return (item is null || item.Selected)
            ? tick
            : null;
    }

    private bool Selected_Click(CoreRow? row)
    {
        var item = GetItem(row);
        if(item is not null)
        {
            item.Selected = !item.Selected;
            DoChanged();
            InvalidateRow(row!);
            return false;
        }
        else
        {
            var menu = new ContextMenu();
            menu.AddItem("Select All", null, () =>
            {
                foreach (var item in _items)
                {
                    item.Selected = true;
                }
                DoChanged();
                InvalidateGrid();
            });
            menu.AddItem("Deselect All", null, () =>
            {
                foreach (var item in _items)
                {
                    item.Selected = false;
                }
                DoChanged();
                InvalidateGrid();
            });
            menu.IsOpen = true;
            return false;
        }
    }

    protected override void DoReconfigure(DynamicGridOptions options)
    {
        base.DoReconfigure(options);

        options.Clear();
        options.SelectColumns = true;
        options.FilterRows = true;
    }
}

public static class PostUtils
{
    private static readonly Inflector.Inflector inflector = new(new CultureInfo("en"));

    public static void PostEntities<T>(IDataModel<T> model, Action refresh, Action? configurePost = null)
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        bool retry;
        do
        {
            retry = false;
            try
            {
                var result = PosterUtils.Process(model);
                if (result is null)
                {
                    MessageWindow.ShowMessage($"Processing failed", "Processing failed");
                    refresh();
                }
                else
                {
                    var failedMessages = new List<string>();
                    var successCount = 0;
                    foreach (var entity in result.PostedEntities)
                    {
                        if (entity.PostedStatus == PostedStatus.PostFailed)
                        {
                            failedMessages.Add(entity.PostedNote);
                        }
                        else
                        {
                            successCount++;
                        }
                    }
                    if (successCount == 0)
                    {
                        MessageWindow.ShowMessage($"Processing failed:\n - {string.Join("\n - ", failedMessages)}", "Processing failed.");
                    }
                    else if (failedMessages.Count == 0)
                    {
                        MessageWindow.ShowMessage($"Processing successful; {successCount} items processed", "Processing successful.");
                    }
                    else
                    {
                        MessageWindow.ShowMessage($"{successCount} items succeeded, but {failedMessages.Count} failed:\n - {string.Join("\n - ", failedMessages)}", "Partial success");
                    }
                    refresh();
                }
            }
            catch (EmptyPostException)
            {
                MessageWindow.ShowMessage($"Please select at least one {typeof(T).Name}.", "Select items");
            }
            catch (PostFailedMessageException e)
            {
                MessageWindow.ShowMessage(e.Message, "Post failed");
            }
            catch (RepostedException)
            {
                MessageWindow.ShowMessage("At least one of the items you selected has already been processed. Processing cancelled.", "Already processed");
            }
            catch (PostCancelledException)
            {
                MessageWindow.ShowMessage("Processing cancelled.", "Cancelled");
            }
            catch (MissingSettingException e)
            {
                if (configurePost is not null && Security.CanConfigurePost<T>())
                {
                    if (MessageWindow.ShowYesNo($"'{e.Setting}' has not been set-up for {inflector.Pluralize(typeof(T).Name)}. Would you like to configure this now?",
                        "Configure Processing?"))
                    {
                        bool success = false;
                        if (e.SettingsType.IsAssignableTo(typeof(IGlobalPosterSettings)))
                        {
                            success = PostableSettingsGrid.ConfigureGlobalPosterSettings(e.SettingsType);
                        }
                        else
                        {
                            success = PostableSettingsGrid.ConfigurePosterSettings<T>(e.SettingsType);
                        }
                        if (success && MessageWindow.ShowYesNo("Settings updated; Would you like to retry the post?", "Retry?"))
                        {
                            retry = true;
                        }
                        else
                        {
                            MessageWindow.ShowMessage("Processing cancelled.", "Cancelled");
                        }
                    }
                    else
                    {
                        MessageWindow.ShowMessage("Processing cancelled.", "Cancelled");
                    }
                }
                else
                {
                    MessageWindow.ShowMessage($"'{e.Setting}' has not been set-up for {inflector.Pluralize(typeof(T).Name)}", "Unconfigured");
                }
            }
            catch (MissingSettingsException)
            {
                if (configurePost is not null && Security.CanConfigurePost<T>())
                {
                    if (MessageWindow.ShowYesNo($"Processing has not been configured for {inflector.Pluralize(typeof(T).Name)}. Would you like to configure this now?",
                        "Configure Processing?"))
                    {
                        configurePost();
                    }
                    else
                    {
                        MessageWindow.ShowMessage("Processing cancelled.", "Cancelled");
                    }
                }
                else
                {
                    MessageWindow.ShowMessage($"Processing has not been configured for {inflector.Pluralize(typeof(T).Name)}!", "Unconfigured");
                }
            }
            catch (Exception e)
            {
                MessageWindow.ShowError("Processing failed.", e);
                refresh();
            }
        } while (retry);
    }

    public static bool ShowPullResultGrid<T>(IPullResult<T> result, [NotNullWhen(true)] out List<PullResultItem<T>>? items)
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        var resultGrid = new PullResultGrid<T>(result);
        var window = new DynamicContentDialog(resultGrid)
        {
            Title = "Select items to import:",
            CanSave = false
        };
        resultGrid.OnChanged += (o, e) => window.CanSave = resultGrid.CanSave;
        resultGrid.Refresh(true, true);
        if(window.ShowDialog() == true)
        {
            items = resultGrid.Selected.ToList();
            Client.Save(items.Select(x => x.Item), "Posted by user.");
            return true;
        }
        else
        {
            items = null;
            return false;
        }
    }

    public static void PullEntities<T>(Action refresh, Action? configurePost = null)
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        bool retry;
        do
        {
            retry = false;
            try
            {
                var result = PosterUtils.Pull<T>();
                if (result is null)
                {
                    MessageWindow.ShowMessage($"Import failed", "Import failed");
                    refresh();
                }
                else
                {
                    List<PullResultItem<T>>? items;
                    if (!result.PulledEntities.Any(x => x.Item.PostedStatus != PostedStatus.PostFailed))
                    {
                        items = result.PulledEntities.ToList();
                    }
                    else
                    {
                        ShowPullResultGrid(result, out items);
                    }
                    if (items is null)
                    {
                        MessageWindow.ShowMessage("Import cancelled.", "Cancelled");
                    }
                    else
                    {
                        var failedMessages = new List<string>();
                        var successCount = 0;
                        var importCount = 0;
                        var updateCount = 0;
                        var linkCount = 0;
                        foreach (var item in items)
                        {
                            if (item.Item.PostedStatus == PostedStatus.PostFailed)
                            {
                                failedMessages.Add(item.Item.PostedNote);
                            }
                            else
                            {
                                successCount++;
                                switch (item.Type)
                                {
                                    case PullResultType.New:
                                        importCount++;
                                        break;
                                    case PullResultType.Linked:
                                        linkCount++;
                                        break;
                                    case PullResultType.Updated:
                                    default:
                                        updateCount++;
                                        break;
                                }
                            }
                        }
                        if (failedMessages.Count > 0 && successCount == 0)
                        {
                            MessageWindow.ShowMessage($"Import failed:\n - {string.Join("\n - ", failedMessages)}", "Import failed.");
                        }
                        else if (failedMessages.Count == 0)
                        {
                            if (successCount == 0)
                            {
                                MessageWindow.ShowMessage($"Nothing imported.", "Import successful.");
                            }
                            else
                            {
                                MessageWindow.ShowMessage($"Import successful; {importCount} items imported, {linkCount} items linked.", "Import successful.");
                            }
                        }
                        else
                        {
                            MessageWindow.ShowMessage($"{successCount} items succeeded, but {failedMessages.Count} failed:\n - {string.Join("\n - ", failedMessages)}", "Partial success");
                        }
                        refresh();
                    }
                }
            }
            catch (PullFailedMessageException e)
            {
                MessageWindow.ShowMessage(e.Message, "Import failed");
            }
            catch (PullCancelledException)
            {
                MessageWindow.ShowMessage("Import cancelled.", "Cancelled");
            }
            catch (MissingSettingException e)
            {
                if (configurePost is not null && Security.CanConfigurePost<T>())
                {
                    if (MessageWindow.ShowYesNo($"'{e.Setting}' has not been set-up for {inflector.Pluralize(typeof(T).Name)}. Would you like to configure this now?",
                        "Configure Import?"))
                    {
                        bool success = false;
                        if (e.SettingsType.IsAssignableTo(typeof(IGlobalPosterSettings)))
                        {
                            success = PostableSettingsGrid.ConfigureGlobalPosterSettings(e.SettingsType);
                        }
                        else
                        {
                            success = PostableSettingsGrid.ConfigurePosterSettings<T>(e.SettingsType);
                        }
                        if (success && MessageWindow.ShowYesNo("Settings updated; Would you like to retry the import?", "Retry?"))
                        {
                            retry = true;
                        }
                        else
                        {
                            MessageWindow.ShowMessage("Import cancelled.", "Cancelled");
                        }
                    }
                    else
                    {
                        MessageWindow.ShowMessage("Import cancelled.", "Cancelled");
                    }
                }
                else
                {
                    MessageWindow.ShowMessage($"'{e.Setting}' has not been set-up for {inflector.Pluralize(typeof(T).Name)}", "Unconfigured");
                }
            }
            catch (MissingSettingsException)
            {
                if (configurePost is not null && Security.CanConfigurePost<T>())
                {
                    if (MessageWindow.ShowYesNo($"Importing has not been configured for {inflector.Pluralize(typeof(T).Name)}. Would you like to configure this now?",
                        "Configure Import?"))
                    {
                        configurePost();
                    }
                    else
                    {
                        MessageWindow.ShowMessage("Import cancelled.", "Cancelled");
                    }
                }
                else
                {
                    MessageWindow.ShowMessage($"Importing has not been configured for {inflector.Pluralize(typeof(T).Name)}!", "Unconfigured");
                }
            }
            catch (Exception e)
            {
                MessageWindow.ShowError("Import failed.", e);
                refresh();
            }
        } while (retry);
    }

    public static void CreateToolbarButtons<T>(IPanelHost host, Func<IDataModel<T>> model, Action refresh, Action? configurePost = null)
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        if (!Security.CanPost<T>()) return;

        var postSettings = PosterUtils.LoadPostableSettings<T>();
        if (!postSettings.PosterType.IsNullOrWhiteSpace())
        {
            var posterEngine = PosterUtils.GetEngine(typeof(T));

            Bitmap? image = null;
            if (postSettings.Thumbnail.ID != Guid.Empty)
            {
                var icon = new Client<Document>()
                    .Load(new Filter<Document>(x => x.ID).IsEqualTo(postSettings.Thumbnail.ID)).FirstOrDefault();
                if (icon?.Data?.Any() == true)
                    image = new ImageConverter().ConvertFrom(icon.Data) as Bitmap;
            }
            host.CreatePanelAction(new PanelAction
            {
                Caption = postSettings.ButtonName.NotWhiteSpaceOr($"Process {inflector.Pluralize(typeof(T).Name)}"),
                Image = image ?? PRSDesktop.Resources.edit,
                OnExecute = action =>
                {
                    PostEntities(
                        model(),
                        refresh,
                        configurePost);
                }
            });
            if(posterEngine.Get(out var posterEngineType, out var _) && posterEngineType.HasInterface(typeof(IPullerEngine<>)) && postSettings.ShowPullButton)
            {
                host.CreatePanelAction(new PanelAction($"Import {inflector.Pluralize(typeof(T).Name)}", image ?? PRSDesktop.Resources.doc_xls, action =>
                {
                    PullEntities<T>(refresh);
                }));
            }

            if (postSettings.ShowClearButton)
            {
                host.CreatePanelAction(new PanelAction
                {
                    Caption = "Clear Posted Flag",
                    Image = image ?? PRSDesktop.Resources.refresh,
                    OnExecute = action =>
                    {
                        var dataModel = model();
                        foreach(var (key, table) in dataModel.ModelTables)
                        {
                            table.IsDefault = false;
                        }
                        dataModel.SetColumns<T>(Columns.Required<T>().Add(x => x.PostedStatus).Add(x => x.PostedReference).Add(x => x.PostedNote).Add(x => x.Posted));
                        dataModel.SetIsDefault<T>(true);
                        dataModel.LoadModel();
                        var items = dataModel.GetTable<T>().ToArray<T>();
                        foreach(var item in items)
                        {
                            item.PostedStatus = PostedStatus.NeverPosted;
                            item.PostedReference = "";
                            item.PostedNote = "";
                            item.Posted = DateTime.MinValue;
                        }
                        Client.Save(items, "Cleared posted flag");
                        refresh();
                    }
                });
            }
        }

        if (configurePost is not null)
        {
            host.CreateSetupAction(new PanelAction
            {
                Caption = $"Configure {CoreUtils.Neatify(typeof(T).Name)} Processing",
                OnExecute = action =>
                {
                    configurePost();
                }
            });
        }
    }

    public static void ConfigurePost<T>()
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        var postSettings = PosterUtils.LoadPostableSettings<T>();

        var grid = (DynamicGridUtils.CreateDynamicGrid(typeof(DynamicGrid<>), typeof(PostableSettings)) as DynamicGrid<PostableSettings>)!;
        if (grid.EditItems(new PostableSettings[] { postSettings }))
        {
            PosterUtils.SavePostableSettings<T>(postSettings);
        }
    }

    public static void CreateToolbarButtons<T>(IPanelHost host, Func<IDataModel<T>> model, Action refresh, bool allowConfig)
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        CreateToolbarButtons(host, model, refresh, allowConfig ? ConfigurePost<T> : null);
    }

    #region PostColumn

    private static readonly BitmapImage? post = PRSDesktop.Resources.post.AsBitmapImage();
    private static readonly BitmapImage? tick = PRSDesktop.Resources.tick.AsBitmapImage();
    private static readonly BitmapImage? warning = PRSDesktop.Resources.warning.AsBitmapImage();
    private static readonly BitmapImage? refresh = PRSDesktop.Resources.refresh.AsBitmapImage();

    public static void AddPostColumn<T>(DynamicGrid<T> grid)
        where T : Entity, IPostable, IRemotable, IPersistent, new()
    {
        grid.HiddenColumns.Add(x => x.PostedStatus);
        grid.HiddenColumns.Add(x => x.PostedNote);
        
        grid.ActionColumns.Add(new DynamicImageColumn(
            row =>
            {
                if (row is null) 
                    return post;
                return row.Get<T, PostedStatus>(x => x.PostedStatus) switch
                {
                    PostedStatus.PostFailed => warning,
                    PostedStatus.Posted => tick,
                    PostedStatus.RequiresRepost => refresh,
                    PostedStatus.NeverPosted or _ => null,
                };
            },
            null)
        {
            ToolTip = (column, row) =>
            {
                if (row is null)
                {
                    return column.TextToolTip($"{CoreUtils.Neatify(typeof(T).Name)} Processed Status");
                }
                return column.TextToolTip(row.Get<T, PostedStatus>(x => x.PostedStatus) switch
                {
                    PostedStatus.PostFailed => "Post failed: " + row.Get<T, string>(x => x.PostedNote),
                    PostedStatus.RequiresRepost => "Repost required: " + row.Get<T, string>(x => x.PostedNote),
                    PostedStatus.Posted => "Processed",
                    PostedStatus.NeverPosted or _ => "Not posted yet",
                });
            }
        });
    }

    #endregion
}