using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Motorola.Snapi;
using Motorola.Snapi.Constants.Enums;
using Motorola.Snapi.EventArguments;

//using RestSharp;

namespace PRSDesktop
{
    /// <summary>
    ///     Interaction logic for RequisitionPanel.xaml
    /// </summary>
    public partial class RequisitionPanel : UserControl, IPanel<Requisition>
    {
        private Requisition _requisition;

        public List<IMotorolaBarcodeScanner> Scanners = new();

        public RequisitionPanel()
        {
            InitializeComponent();
            PickImage.Source = PRSDesktop.Resources.tick.AsBitmapImage(Color.White);
            StockImage.Source = PRSDesktop.Resources.forklift.AsBitmapImage(Color.White);
            TruckImage.Source = PRSDesktop.Resources.truck.AsBitmapImage();
        }

        //DateTime lastselection = DateTime.MaxValue;
        //DispatcherTimer timer = new DispatcherTimer();

        public event DataModelUpdateEvent OnUpdateDataModel;

        public bool IsReady { get; set; }

        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>
            {
                { typeof(Requisition).EntityName(), Requisitions.SelectedRows },
                { typeof(RequisitionItem).EntityName(), Items.SelectedRows }
            };
        }

        public void Setup()
        {
            //Requisitions.OnSelectItem += Requisitions_OnSelectItem;

            //Requisitions.OnRequisitionFillStateChanged += Requisitions_OnRequisitionFillStateChanged;
            //Requisitions.OnRequisitionBoxesChanged += Requisitions_OnRequisitionBoxesChanged;

            SetupScanner();

            Requisitions.Refresh(true, false);
            Items.Refresh(true, false);

            UpdateLayout();
        }


        public void Shutdown()
        {
            ShutdownScanner();
        }

        public void CreateToolbarButtons(IPanelHost host)
        {
            //host.CreatePanelAction(new PanelAction() { Caption = "Archive Requisition", Image = PRSDesktop.Resources.delete, OnExecute = ArchiveRequisition });
        }

        public string SectionName => "Requisitions";
        public DataModel DataModel(Selection selection)
        {
            var ids = Requisitions.ExtractValues(x => x.ID, selection).ToArray();
            return new BaseDataModel<Requisition>(new Filter<Requisition>(x => x.ID).InList(ids));
        }

        public void Refresh()
        {
            Requisitions.Refresh(false, true);
            //lastselection = DateTime.MinValue;
            //Items.Refresh(true, false);
        }

        public void Heartbeat(TimeSpan time)
        {
            // Nothing to do here
        }

        private void ShutdownScanner()
        {
            try
            {
                foreach (var scanner in Scanners) scanner.Actions.ToggleLed(LedMode.GreenOff);
                BarcodeScannerManager.Instance.DataReceived -= Instance_DataReceived;

                BarcodeScannerManager.Instance.Close();
            }
            catch (Exception e)
            {
                MessageBox.Show("Error Shutting down Scanner!\n\n" + e.Message);
            }
        }

        private void SetupScanner()
        {
            Scanners.Clear();
            BarcodeScannerManager.Instance.Open();

            BarcodeScannerManager.Instance.RegisterForEvents(EventType.Barcode, EventType.Pnp, EventType.Image, EventType.Other, EventType.Rmd);

            BarcodeScannerManager.Instance.GetDevices();
            foreach (var scanner in BarcodeScannerManager.Instance.GetDevices())
            {
                Scanners.Add(scanner);
                scanner.Actions.ToggleLed(LedMode.RedOn);
                scanner.Actions.SoundBeeper(BeepPattern.FastWarble);
            }

            BarcodeScannerManager.Instance.DataReceived += Instance_DataReceived;
        }

        private void Instance_DataReceived(object sender, BarcodeScanEventArgs e)
        {
            Dispatcher.Invoke(() => { ProcessCode(Scanners[(int)e.ScannerId], e.Data); });
        }

        private void ProcessCode(IMotorolaBarcodeScanner scanner, string code)
        {
            try
            {
                var iRow = Requisitions.SelectedRows.First().Index;
                if (iRow == -1)
                    throw new Exception("Please select a Requsition First");

                var row = Requisitions.Data.Rows[iRow];
                var filled = row.Get<Requisition, DateTime>(x => x.Filled);

                if (!filled.IsEmpty())
                    throw new Exception("Cannot Add Items to a completed Requisition");

                var reqid = row.Get<Requisition, Guid>(x => x.ID);

                var boxes = row.Get<Requisition, int>(x => x.Boxes);

                var sCode = code;
                var iQty = 1;
                if (sCode.Contains("*"))
                {
                    var comps = sCode.Split('*');
                    sCode = comps[0];
                    iQty = int.Parse(comps[1].Trim());
                }

                RequisitionItem item = null;
                CoreRow itemrow = null;
                try
                {
                    itemrow = Items.Data.Rows.FirstOrDefault(r => /* r.Get<RequisitionItem, int>(x => x.BoxNumber).Equals(boxes) && */
                        r.Get<RequisitionItem, string>(x => x.BarCode).Equals(sCode));
                    //itemrow = Items.Data.Rows.FirstOrDefault(r => r.Get<RequisitionItem, String>(x => x.BarCode).Equals(sCode));
                }
                catch (Exception e)
                {
                    Logger.Send(LogType.Error, "", string.Format("*** Unknown Error: {0}\n{1}", e.Message, e.StackTrace));
                }

                if (itemrow != null)
                    item = new Client<RequisitionItem>()
                        .Load(new Filter<RequisitionItem>(x => x.ID).IsEqualTo(itemrow.Get<RequisitionItem, Guid>(x => x.ID))).FirstOrDefault();
                if (item != null)
                {
                    item.Quantity += iQty;
                    new Client<RequisitionItem>().Save(item, "Quantity Updated by Barcode Scanner");
                    if (scanner != null)
                        scanner.Actions.SoundBeeper(BeepPattern.LowHigh);
                    Refresh();
                }
                else
                {
                    var product = new Client<Product>().Load(new Filter<Product>(x => x.Code).IsEqualTo(sCode)).FirstOrDefault();
                    if (product != null)
                    {
                        item = new RequisitionItem
                        {
                            RequisitionLink = new RequisitionLink { ID = reqid },
                            //BoxNumber = boxes,
                            Code = product.Code,
                            Description = product.Name,
                            BarCode = sCode,
                            Quantity = iQty
                        };
                        new Client<RequisitionItem>().Save(item, "Scanned by Barcode Reader");

                        if (scanner != null)
                            scanner.Actions.SoundBeeper(BeepPattern.LowHigh);

                        Refresh();
                    }
                    else
                    {
                        if (scanner != null)
                            scanner.Actions.SoundBeeper(BeepPattern.FourLowLong);
                    }
                }
            }
            catch (Exception e)
            {
                if (scanner != null)
                    scanner.Actions.SoundBeeper(BeepPattern.FourLowShort);
            }
        }

        private void ArchiveRequisition(PanelAction obj)
        {
            var bClosed = false;
            var iRow = Requisitions.SelectedRows.First().Index;
            if (iRow > -1)
            {
                var row = Requisitions.Data.Rows[iRow];
                var id = row.Get<Requisition, Guid>(x => x.ID);
                var filled = row.Get<Requisition, DateTime>(x => x.Filled);
                if (filled.IsEmpty())
                {
                    MessageBox.Show("Please complete this requisition before Archiving it!");
                }
                else
                {
                    var req = new Client<Requisition>().Load(new Filter<Requisition>(x => x.ID).IsEqualTo(id)).FirstOrDefault();
                    if (req != null)
                    {
                        req.Archived = DateTime.Now;
                        new Client<Requisition>().Save(req, "Requisition Archived");
                        bClosed = true;
                    }
                }
            }
            else
            {
                MessageBox.Show("Please select a requisition first!");
            }

            if (bClosed)
                Refresh();
        }

        public Dictionary<Type, CoreTable> DataEnvironment()
        {
            var env = new Dictionary<Type, CoreTable>();
            env[typeof(Requisition)] = Requisitions.Data;
            env[typeof(RequisitionItem)] = Items.Data;
            return env;
        }

        //private void Timer_Tick(object sender, EventArgs e)
        //{

        //    if (lastselection < DateTime.Now.AddMilliseconds(-500))
        //    {
        //        lastselection = DateTime.MaxValue;

        //        LoadRequisition();

        //    }

        //}

        private void LoadRequisition()
        {
            foreach (var scanner in Scanners)
                scanner.Actions.ToggleLed(_requisition != null ? LedMode.GreenOn : LedMode.RedOn);


            Title.Text = _requisition != null ? _requisition.Title : "";

            RequestedBy.Content = _requisition != null ? _requisition.RequestedBy.Name : "";

            DueDate.Content = _requisition != null ? string.Format("{0:dddd, dd MMM yyyy}", _requisition.Due) : "";

            var notes = _requisition != null ? _requisition.Notes : new string[] { };
            var request = _requisition != null ? CoreUtils.StripHTML(_requisition.Request) : "";
            Request.Text = string.Join("\n===============================\n", Utility.ProcessNotes(notes, request));

            MarkAsFilled.IsEnabled = _requisition != null && _requisition.Archived.IsEmpty() && _requisition.StockUpdated.IsEmpty();
            MarkAsFilledDescription.Content = _requisition == null || _requisition.Filled.IsEmpty() ? "Mark As Filled" : "Clear Filled Flag";

            Items.Options.BeginUpdate();
            if (_requisition != null)
            {
                if (_requisition.Filled.IsEmpty())
                {
                    Items.Options.Add(DynamicGridOption.AddRows);
                    Items.Options.Add(DynamicGridOption.DeleteRows);
                }
                else
                {
                    Items.Options.Remove(DynamicGridOption.AddRows);
                    Items.Options.Remove(DynamicGridOption.DeleteRows);
                }
            }

            Items.Options.EndUpdate();

            UpdateStock.IsEnabled = Security.IsAllowed<CanUpdateRequisitionStockMovements>() && _requisition != null &&
                                    !_requisition.Filled.IsEmpty();
            UpdateStockDescription.Content =
                _requisition == null || _requisition.StockUpdated.IsEmpty() ? "Update Stock Holdings" : "Clear Stock Movements";

            TakenBy.IsEnabled = _requisition != null && !_requisition.Filled.IsEmpty() && _requisition.Archived.IsEmpty() &&
                                !_requisition.Delivery.IsValid();

            TakenByDescription.Content = _requisition == null
                ? "Select Employee"
                : _requisition.Delivery.IsValid()
                    ? _requisition.Delivery.Completed.IsEmpty()
                        ? string.Format("Booked On Delivery #{0}", _requisition.Delivery.Number)
                        : string.Format("Delivered on {0:dd MMM yy} (#{1})", _requisition.Delivery.Completed, _requisition.Delivery.Number)
                    : _requisition.TakenBy.IsValid()
                        ? string.Format("{0} ({1:dd MMM yy})", _requisition.TakenBy.Name, _requisition.Archived)
                        : "Select Employee";
        }

        private void Requisitions_OnSelectItem(object sender, DynamicGridSelectionEventArgs e)
        {
            _requisition = e.Rows?.FirstOrDefault()?.ToObject<Requisition>();
            LoadRequisition();
            Items.Requisition = _requisition;
            Items.Refresh(false, true);
            //lastselection = DateTime.Now;
            //Dispatcher.Invoke(() => { LoadRequisition(); });
        }

        private void TakenBy_Click(object sender, RoutedEventArgs e)
        {
            if (_requisition == null || _requisition.ID == Guid.Empty)
                return;

            var dlg = new MultiSelectDialog<Employee>(
                LookupFactory.DefineFilter<Employee>(),
                LookupFactory.DefineColumns<Employee>(),
                false);

            if (!dlg.ShowDialog())
                return;

            if (!_requisition.Filled.IsEmpty() && !_requisition.StockUpdated.IsEmpty())
                if (MessageBox.Show("This will remove this requisition from this list.\nAre you sure you wish to continue?", "Close Requisition?",
                        MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
                    return;

            if (_requisition.Archived.IsEmpty())
                _requisition.Archived = DateTime.Now;

            var emp = dlg.Data()?.Rows.FirstOrDefault();
            _requisition.TakenBy.ID = emp != null ? emp.Get<Employee, Guid>(x => x.ID) : Guid.Empty;
            _requisition.TakenBy.Name = emp != null ? emp.Get<Employee, string>(x => x.Name) : "";

            Progress.Show("Updating Requisition Delivery Status");
            new Client<Requisition>().Save(_requisition, "Updated [TakenBy] Flag");
            if (!_requisition.Filled.IsEmpty() && !_requisition.StockUpdated.IsEmpty() && !_requisition.Archived.IsEmpty())
            {
                Refresh();
            }
            else
            {
                Requisitions.UpdateRow<Requisition, Guid>(Requisitions.SelectedRows.First(), x => x.TakenBy.ID, _requisition.TakenBy.ID, false);
                Requisitions.UpdateRow<Requisition, string>(Requisitions.SelectedRows.First(), x => x.TakenBy.Name, _requisition.TakenBy.Name, false);
                Requisitions.UpdateRow<Requisition, DateTime>(Requisitions.SelectedRows.First(), x => x.Archived, _requisition.Archived);
                LoadRequisition();
            }

            Progress.Close();
        }

        private void MarkAsFilled_Click(object sender, RoutedEventArgs e)
        {
            if (_requisition == null)
            {
                MessageBox.Show("Please select a Requisition first!");
                return;
            }

            DateTime filltime = DateTime.Now;
            
            var unpickeditems = Items.Data.Rows.Where(r =>
                _requisition.Filled.IsEmpty()
                && (r.Get<RequisitionItem, Guid>(x => x.Product.ID) != Guid.Empty)
                && (r.Get<RequisitionItem, bool>(x => x.Product.NonStock) != true)
                && (r.Get<RequisitionItem, DateTime>(x => x.Picked).IsEmpty())
            );
            if (unpickeditems.Any())
            {
                var confirm = MessageBox.Show("Unpicked items exist on this requisition!\n\nDo you want to mark them as picked now?",
                    "Unpicked Items", MessageBoxButton.YesNoCancel, MessageBoxImage.Question);
                if (confirm == MessageBoxResult.Cancel)
                    return;
                filltime = DateTime.Now;
                if (confirm == MessageBoxResult.Yes)
                {
                    List<RequisitionItem> updates = new List<RequisitionItem>();
                    foreach (var row in unpickeditems)
                    {
                        var item = row.ToObject<RequisitionItem>();
                        item.Picked = filltime;
                        updates.Add(item);
                    }
                    new Client<RequisitionItem>().Save(updates, "Marked as Picked because Requisition was marked as filled");
                }
            }

            _requisition.Filled = _requisition.Filled.IsEmpty() ? filltime : DateTime.MinValue;
            Progress.Show(_requisition.Filled.IsEmpty() ? "Clearing Delivery Items" : "Creating Delivery Items");
            new Client<Requisition>().Save(_requisition, "Updated Filled Flag");
            Requisitions.UpdateRow<Requisition, DateTime>(Requisitions.SelectedRows.First(), x => x.Filled, _requisition.Filled);
            LoadRequisition();
            Items.Refresh(false, true);
            Progress.Close();
        }

        private void UpdateStock_Click(object sender, RoutedEventArgs e)
        {
            if (_requisition == null)
            {
                MessageBox.Show("Please select a Requisition first!");
                return;
            }

            if (_requisition.StockUpdated.IsEmpty())
            {
                var emptyrows = Items.Data.Rows.Where(r =>
                    !Entity.IsEntityLinkValid<RequisitionItem, StockLocationLink>(x => x.Location, r) &&
                    r.Get<RequisitionItem, bool>(c => c.Product.NonStock).Equals(false));
                if (emptyrows.Any())
                {
                    MessageBox.Show("You must select a Holding for each non-stock Item on this Requisition!", "Missing Holdings", MessageBoxButton.OK,
                        MessageBoxImage.Error);
                    return;
                }

                if (!_requisition.Filled.IsEmpty() && !_requisition.Archived.IsEmpty())
                {
                    if (MessageBox.Show("This will remove this requisition from this list.\nAre you sure you wish to continue?", "Close Requisition?",
                            MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
                        return;
                }
                else
                {
                    if (MessageBox.Show("Update Stock Movements?", "Confirm", MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                        return;
                }

                _requisition.StockUpdated = DateTime.Now;
            }
            else
            {
                if (MessageBox.Show("Clear Stock Movements?", "Confirm", MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                    return;
                _requisition.StockUpdated = DateTime.MinValue;
            }

            Progress.Show("Updating Stock Holdings");
            new Client<Requisition>().Save(_requisition, "Updated Stock Flag");
            if (!_requisition.Filled.IsEmpty() && !_requisition.StockUpdated.IsEmpty() && !_requisition.Archived.IsEmpty())
            {
                Refresh();
            }
            else
            {
                Requisitions.UpdateRow<Requisition, DateTime>(Requisitions.SelectedRows.First(), x => x.StockUpdated, _requisition.StockUpdated);
                LoadRequisition();
            }

            Progress.Close();
        }
    }
}