using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace PRSDesktop.Forms.Issues;

public class IssuesGrid : DynamicGrid<Kanban>, ISpecificGrid
{
    private readonly int ChunkSize = 500;

    private IClient<Kanban> _client;

    public Func<Type, IClient> ClientFactory { get; set; }

    private IClient<Kanban> Client
    {
        get
        {
            _client ??= (ClientFactory(typeof(Kanban)) as IClient<Kanban>)!;
            return _client;
        }
    }

    public Guid CustomerID { get; set; }

    public IssuesGrid() : base()
    {
        var cols = LookupFactory.DefineColumns<Kanban>();

        // Minimum Columns for Lookup values
        foreach (var col in cols)
            HiddenColumns.Add(col);

        ActionColumns.Add(new DynamicMenuColumn(BuildMenu) { Position = DynamicActionColumnPosition.End });
    }

    protected override void Init()
    {
    }

    protected override void DoReconfigure(DynamicGridOptions options)
    {
        options.Clear();
        options.AddRows = true;
        options.EditRows = true;
    }

    private void BuildMenu(DynamicMenuColumn column, CoreRow? row)
    {
        if (row is null) return;

        var menu = column.GetMenu();
        menu.AddItem("Add Note", null, row, AddNote_Click);
        menu.AddItem("Close Issue", null, row, CloseTask_Click);
    }

    public override Kanban CreateItem()
    {
        var item = base.CreateItem();
        // item.UserProperties["CustomerID"] = CustomerID.ToString();
        return item;
    }

    private void AddNote_Click(CoreRow row)
    {
        var kanban = row.ToObject<Kanban>();
    }

    private void CloseTask_Click(CoreRow row)
    {
    }

    private Column<Kanban>[] AllowedColumns = [
        new(x => x.Number),
        new(x => x.Title),
        new(x => x.Description),
        new(x => x.Notes),
        new(x => x.Type.ID)];

    protected override void CustomiseEditor(Kanban[] items, DynamicGridColumn column, BaseEditor editor)
    {
        base.CustomiseEditor(items, column, editor);
        if(!AllowedColumns.Any(x => x.Property == column.ColumnName))
        {
            editor.Editable = editor.Editable.Combine(Editable.Hidden);
        }
    }

    public virtual CoreTable LookupValues(DataLookupEditor editor, Type parent, string columnname, BaseObject[]? items)
    {
        var client = ClientFactory(editor.Type);

        var filter = LookupFactory.DefineLookupFilter(parent, editor.Type, columnname, items ?? (Array.CreateInstance(parent, 0) as BaseObject[])!);
        var columns = LookupFactory.DefineLookupColumns(parent, editor.Type, columnname);

        foreach (var key in editor.OtherColumns.Keys)
            columns.Add(key);

        var sort = LookupFactory.DefineSort(editor.Type);
        var result = client.Query(filter, columns, sort);

        result.Columns.Add(new CoreColumn { ColumnName = "Display", DataType = typeof(string) });
        foreach (var row in result.Rows)
        {
            row["Display"] = LookupFactory.FormatLookup(parent, editor.Type, row, columnname);
        }

        return result;
    }

    protected override void DefineLookups(ILookupEditorControl sender, Kanban[] items, bool async = true)
    {
        if (sender.EditorDefinition is not DataLookupEditor editor)
        {
            base.DefineLookups(sender, items, async: async);
            return;
        }

        var colname = sender.ColumnName;
        if (async)
        {
            Task.Run(() =>
            {
                try
                {
                    var values = LookupValues(editor, typeof(Kanban), colname, items);
                    Dispatcher.Invoke(
                        () =>
                        {
                            try
                            {
                                //Logger.Send(LogType.Information, typeof(T).Name, "Dispatching Results" + colname);
                                sender.LoadLookups(values);
                            }
                            catch (Exception e2)
                            {
                                Logger.Send(LogType.Information, typeof(Kanban).Name,
                                    "Exception (2) in LoadLookups: " + e2.Message + "\n" + e2.StackTrace);
                            }
                        }
                    );
                }
                catch (Exception e)
                {
                    Logger.Send(LogType.Information, typeof(Kanban).Name,
                        "Exception (1) in LoadLookups: " + e.Message + "\n" + e.StackTrace);
                }
            });
        }
        else
        {
            var values = LookupValues(editor, typeof(Kanban), colname, items);
            sender.LoadLookups(values);
        }
    }

    public override DynamicEditorPages LoadEditorPages(Kanban item)
    {
        var pages = new DynamicEditorPages
        {
            new DynamicDocumentGrid<KanbanDocument, Kanban, KanbanLink>()
        };
        return pages;
    }

    protected override DynamicGridColumns LoadColumns()
    {
        var columns = new DynamicGridColumns<Kanban>();
        columns.Add(x => x.Number);
        columns.Add(x => x.Title);
        columns.Add(x => x.Type.Code);
        return columns;
    }

    #region Grid Stuff

    protected override string FormatRecordCount(int count)
    {
        return IsPaging 
            ? $"{base.FormatRecordCount(count)} (loading..)"
            : base.FormatRecordCount(count);
    }

    protected override void Reload(
        Filters<Kanban> criteria, Columns<Kanban> columns, ref SortOrder<Kanban>? sort,
        CancellationToken token, Action<CoreTable?, Exception?> action)
    {
        // criteria.Add(new Filter<Kanban>("CustomerID").IsEqualTo(CustomerID.ToString()));
        if(Options.PageSize > 0)
        {
            var inSort = sort;
            Task.Run(() =>
            {
                
                var page = CoreRange.Database(Options.PageSize);
                var filter = criteria.Combine();
                
                IsPaging = true;
                while (!token.IsCancellationRequested)
                {
                    try
                    {
                        var data = Client.Query(filter, columns, inSort, page);
                        data.Offset = page.Offset;
                        IsPaging = data.Rows.Count == page.Limit;

                        if (token.IsCancellationRequested)
                        {
                            break;
                        }

                        action(data, null);
                        if (!IsPaging)
                            break;
                        
                        // Proposal - Let's slow it down a bit to enhance UI responsiveness?
                        Thread.Sleep(100);
                        
                        page.Next();
                    }
                    catch (Exception e)
                    {
                        action(null, e);
                        break;
                    }
                }
            }, token);
        }
        else
        {
            Client.Query(criteria.Combine(), columns, sort, null, action);
        }
    }

    public override Kanban[] LoadItems(IList<CoreRow> rows)
    {
        var results = new List<Kanban>(rows.Count);
        for (var i = 0; i < rows.Count; i += ChunkSize)
        {
            var chunk = rows.Skip(i).Take(ChunkSize);
            var filter = new Filter<Kanban>(x => x.ID).InList(chunk.Select(x => x.Get<Kanban, Guid>(x => x.ID)).ToArray());

            var columns = DynamicGridUtils.LoadEditorColumns(Columns.None<Kanban>());
            var data = Client.Query(filter, columns);
            results.AddRange(data.ToObjects<Kanban>());
        }

        return results.ToArray();
    }

    public override Kanban LoadItem(CoreRow row)
    {
        var id = row.Get<Kanban, Guid>(x => x.ID);
        return Client.Query(
            new Filter<Kanban>(x => x.ID).IsEqualTo(id),
            DynamicGridUtils.LoadEditorColumns(Columns.None<Kanban>())).ToObjects<Kanban>().FirstOrDefault()
            ?? throw new Exception($"No Kanban with ID {id}");
    }

    public override void SaveItem(Kanban item)
    {
        Client.Save(item, "Edited by User");
    }

    public override void SaveItems(IEnumerable<Kanban> items)
    {
        Client.Save(items, "Edited by User");
    }

    public override void DeleteItems(params CoreRow[] rows)
    {
        var deletes = new List<Kanban>();
        foreach (var row in rows)
        {
            var delete = new Kanban
            {
                ID = row.Get<Kanban, Guid>(x => x.ID)
            };

            deletes.Add(delete);
        }

        Client.Delete(deletes, "Deleted on User Request");
    }

    #endregion
}