using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using com.sun.tools.@internal.ws.processor.util;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Wpf;
using InABox.WPF;
using PRSDesktop.Panels.Products.Locations;
using Syncfusion.Windows.Controls.RichTextBoxAdv;
using Exception = System.Exception;

namespace PRSDesktop;

public class StockHoldingGrid : DynamicDataGrid<StockHolding>
{
    private enum MovementAction
    {
        Receive,
        Issue,
        Transfer
    }
    private MovementAction _action;
    private StockHolding? _holding;
    
    private Button IssueButton;

    private Button ReceiveButton;

    private DynamicDataGrid<StockMovement> smg;

    //Button ReserveButton = null;

    private Button TransferButton;
    private Button RecalculateButton;
    private Button AdjustValueButton;
    private Button RelocateButton;

    public StockHoldingGrid() : base()
    {         
        ColumnsTag = "StockHolding";

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

        ReceiveButton = AddButton("Receive", PRSDesktop.Resources.add.AsBitmapImage(), ReceiveStock);
        ReceiveButton.IsEnabled = false;

        IssueButton = AddButton("Issue", PRSDesktop.Resources.delete.AsBitmapImage(), IssueStock);
        IssueButton.IsEnabled = false;

        //ReserveButton = AddButton("Reserve", PRSDesktop.Resources.project.AsBitmapImage(), ReserveStock);
        //ReserveButton.Margin = new Thickness(20, ReserveButton.Margin.Top, ReserveButton.Margin.Right, ReserveButton.Margin.Bottom);
        //ReserveButton.IsEnabled = false;

        TransferButton = AddButton("Transfer", PRSDesktop.Resources.split.AsBitmapImage(), TransferStock);
        TransferButton.Margin = new Thickness(20, TransferButton.Margin.Top, TransferButton.Margin.Right, TransferButton.Margin.Bottom);
        TransferButton.IsEnabled = false;

        RelocateButton = AddButton("Relocate", PRSDesktop.Resources.box.AsBitmapImage(), RelocateStock);
        RelocateButton.IsEnabled = false;

        AdjustValueButton = AddButton("Adjust Value", PRSDesktop.Resources.receipt.AsBitmapImage(), AdjustValues,
            DynamicGridButtonPosition.Right);
        AdjustValueButton.Margin = new Thickness(AdjustValueButton.Margin.Left, AdjustValueButton.Margin.Top, 10, AdjustValueButton.Margin.Bottom);
        
        RecalculateButton = AddButton("Recalculate", PRSDesktop.Resources.service.AsBitmapImage(), RecalculateHoldings,
            DynamicGridButtonPosition.Right);

        HiddenColumns.Add(x => x.Product.ID);
        HiddenColumns.Add(x => x.Job.ID);
        HiddenColumns.Add(x => x.Job.JobNumber);
        HiddenColumns.Add(x => x.Job.Name);
        HiddenColumns.Add(x => x.Location.ID);
        HiddenColumns.Add(x => x.Location.Code);
        HiddenColumns.Add(x => x.Location.Description);
        HiddenColumns.Add(x => x.Style.ID);
        HiddenColumns.Add(x => x.Style.Code);
        HiddenColumns.Add(x => x.Qty);
        HiddenColumns.Add(x => x.Units);
        HiddenColumns.Add(x => x.Available);
        HiddenColumns.Add(x => x.AverageValue);
        HiddenColumns.Add(x => x.Dimensions.Unit.ID);
        HiddenColumns.Add(x => x.Dimensions.Unit.Description);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasHeight);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasLength);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasWidth);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasHeight);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasQuantity);
        HiddenColumns.Add(x => x.Dimensions.Unit.Format);
        HiddenColumns.Add(x => x.Dimensions.Unit.Formula);
        HiddenColumns.Add(x => x.Dimensions.Length);
        HiddenColumns.Add(x => x.Dimensions.Width);
        HiddenColumns.Add(x => x.Dimensions.Height);
        HiddenColumns.Add(x => x.Dimensions.Quantity);
        HiddenColumns.Add(x => x.Dimensions.Value);        
        HiddenColumns.Add(x => x.Dimensions.UnitSize);

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

    private bool AdjustValues(Button arg1, CoreRow[] rows)
    {
        if (rows?.Any() != true)
            return false;
        
        double _newvalue = 0.0;
        if (DoubleEdit.Execute("New Average Value", 0, double.MaxValue, ref _newvalue))
        {
            Progress.ShowModal("Creating Batch", progress =>
            {
                StockMovementBatch _batch = new StockMovementBatch()
                {
                    Type = StockMovementBatchType.Transfer,
                    Employee = new EmployeeLink() { ID = App.EmployeeID },
                    Notes = "Stock Value Adjustment"
                };
                Client.Save(_batch,"Stock value adjusted from holding grid");
                
                progress.Report("Creating Movements");
                List<StockMovement> _updates = new List<StockMovement>();
                foreach (var _row in rows)
                {
                    var _holding = _row.ToObject<StockHolding>();
                    _holding.AverageValue = _newvalue;
                    _holding.Value = _newvalue * _holding.Units;
                    Client.Save(_holding,"Stock value adjusted from holding grid");
                    _updates.AddRange(_holding.AdjustValue(_newvalue, _batch));
                }
                
                progress.Report("Saving Movements");
                Client.Save(_updates,"Stock value adjusted from holding grid");
            });
            MessageBox.Show("All Done");
            return true;
        }

        return false;
    }

    private bool RecalculateHoldings(Button arg1, CoreRow[] arg2)
    {
        Dictionary<String, int> messages = new();
        void AddMessage(String type)
        {
            messages.TryGetValue(type, out int count);
            messages[type] = ++count;
        }
        
        Progress.ShowModal("Recalculating", progress =>
        {
            progress.Report("Loading Data");
            MultiQuery query = new MultiQuery();
            
            query.Add(
                new Filter<StockHolding>(x => x.Location.ID).IsEqualTo(Location.ID),
                Columns.Required<StockHolding>().Add(x => x.ID)
                    .Add(x => x.Product.ID)
                    .Add(x => x.Job.ID)
                    .Add(x => x.Style.ID)
                    .AddDimensionsColumns(x => x.Dimensions, Dimensions.ColumnsType.Local)
                    .Add(x => x.Units)
                    .Add(x => x.AverageValue)            
                    .Add(x => x.Available)            
                    .Add(x => x.Qty)
                    .Add(x => x.Weight)
                    .Add(x => x.Value)
            );
            
            query.Add(
                new Filter<StockMovement>(x => x.Location.ID).IsEqualTo(Location.ID),
                Columns.None<StockMovement>().Add(x => x.ID)
                    .Add(x => x.Product.ID)
                    .Add(x => x.Job.ID)
                    .Add(x => x.Style.ID)
                    .AddDimensionsColumns(x => x.Dimensions, Dimensions.ColumnsType.Local)
                    .Add(x => x.Units)
                    .Add(x => x.Cost)
                    .Add(x => x.JobRequisitionItem.ID)
            );
            query.Query();
            var holdings = query.Get<StockHolding>().ToObjects<StockHolding>().ToList();
            var toDelete = new List<StockHolding>();
            var movements = query.Get<StockMovement>().ToObjects<StockMovement>().ToList();

            progress.Report("Processing");
            var updates = new List<StockHolding>();
            
            while (movements.Any())
            {
                var first = movements.First();
                var selected = movements.Where(x => x.IsEqualTo(first)).ToList();

                var holding = holdings.FirstOrDefault(x => x.IsEqualTo(first));
                if (holding == null)
                {
                    holding = new StockHolding();
                    holding.Location.ID = Location.ID;
                    holding.Product.ID = first.Product.ID;
                    holding.Style.ID = first.Style.ID;
                    holding.Job.ID = first.Job.ID;
                    holding.Dimensions.CopyFrom(first.Dimensions);
                }
                holding.Recalculate(selected);

                // Removing from the list so that it is not deleted.
                if (holdings.Contains(holding))
                    holdings.Remove(holding);

                if (holding.Units.IsEffectivelyEqual(0.0) && holding.Available.IsEffectivelyEqual(0.0))
                {
                    if(holding.ID != Guid.Empty)
                    {
                        toDelete.Add(holding);
                    }
                }
                else if (holding.IsChanged())
                {
                    AddMessage(holding.ID != Guid.Empty ? "updated" : "added");
                    updates.Add(holding);
                }

                movements.RemoveAll(x => selected.Any(s => s.ID == x.ID));
            }

            toDelete.AddRange(holdings);
            foreach (var holding in toDelete)
                AddMessage("deleted");

            if (updates.Any())
            {
                progress.Report($"Updating {updates.Count} Holdings");
                new Client<StockHolding>().Save(updates.Where(x => x.IsChanged()), "Updated by Recalculation");
            }

            if (toDelete.Any())
            {
                progress.Report($"Deleting {toDelete.Count} Holdings");
                new Client<StockHolding>().Delete(toDelete, "Removed by Recalculation");
            }

        });
        MessageWindow.ShowMessage(
            messages.Any() 
                ? String.Join("\n", messages.Select(x => $"{x.Value} holdings {x.Key}"))
                : "Nothing to Update!"
            ,"Recalculate");
        return true;
    }

    public override DynamicGridColumns GenerateColumns()
    {
        var columns = new DynamicGridColumns<StockHolding>();

        columns.Add(x => x.Product.Code, 120, "Product Code", "", Alignment.MiddleCenter);
        columns.Add(x => x.Product.Name, 0, "Product Name", "", Alignment.MiddleLeft);
        columns.Add(x => x.Job.JobNumber, 50, "Job", "", Alignment.MiddleCenter);
        columns.Add(x => x.Style.Description, 0, "Style", "", Alignment.MiddleLeft);
        columns.Add(x => x.Dimensions.UnitSize, 100, "Size", "", Alignment.MiddleCenter);
        columns.Add(x => x.Units, 70, "Units", "", Alignment.MiddleCenter);
        columns.Add(x => x.Available, 70, "Available", "", Alignment.MiddleCenter);

        return columns;
    }

    protected override void DoReconfigure(DynamicGridOptions options)
    {
        base.DoReconfigure(options);
        options.AddRows = false;
        options.EditRows = Security.CanEdit<StockHolding>();
        options.DeleteRows = false;
        options.RecordCount = true;
        options.SelectColumns = true;
        options.FilterRows = true;
    }

    private void BuildMenu(DynamicMenuColumn column, CoreRow? row)
    {
        if (row is null) return;
        var holding = row.ToObject<StockHolding>();

        if (holding.Available.IsEffectivelyEqual(holding.Units))
            column.AddItem("(No Requisitions in this Holding", null, null).IsEnabled = false;
        else
        {
            column.AddItem("View Requisition Items", null, ViewRequisitions_Click);
            if (Security.IsAllowed<CanEditAllocatedJobRequisitions>())
            {
                column.GetMenu().AddItem("Release allocated stock", null, holding, ReleaseAllocatedStock_Click);
            }
        }
        
        column.AddSeparator();
        
        column.AddItem("Relocate Items", null, r =>
        {
            var requiitems = holding.LoadRequisitionItems(true).ToArray();
            RelocateItems(holding, requiitems);
        });

        if (holding.Dimensions.Unit.HasDimensions() && holding.Available.IsEffectivelyGreaterThan(0.0))
            column.AddItem("Convert Dimensions", null, r =>
            {
                var calculator = new StockTransformWindow(holding);
                if (calculator.ShowDialog() == true)
                {
                    var transferout = holding.CreateMovement();
                    transferout.Date = DateTime.Now;
                    transferout.Issued = calculator.OldAvailable;
                    transferout.Transaction = Guid.NewGuid();
                    transferout.Type = StockMovementType.TransferOut;

                    var transferin = holding.CreateMovement();
                    transferin.Date = transferout.Date.AddTicks(1);
                    transferin.Dimensions.CopyFrom(calculator.Dimensions);
                    transferin.Received = calculator.NewAvailable;
                    transferin.Transaction = transferout.Transaction;
                    transferin.Type = StockMovementType.TransferIn;
                    
                    Client.Save([transferout,transferin], "Converted Dimensions");
                    
                    Refresh(false,true);
                }
                    
            });

    }

    private void DoTransfer(StockHolding holding, IList<JobRequisitionItem> requiitems, Func<JobRequisitionItem, double?> getQuantity, Action<JobRequisitionItem, StockMovement, StockMovement> modify)
    {
        var updates = new List<StockMovement>();
        DoTransfer(holding, requiitems, getQuantity, modify, updates);

        SaveBatch(StockMovementBatchType.Transfer, updates);
        DoChanged();
        Refresh(false, true);
    }

    private static void DoTransfer(StockHolding holding, IList<JobRequisitionItem> requiitems, Func<JobRequisitionItem, double?> getQuantity, Action<JobRequisitionItem, StockMovement, StockMovement> modify, List<StockMovement> updates)
    {
        foreach(var requi in requiitems)
        {
            var qty = getQuantity(requi);
            if (!qty.HasValue || qty.Value == 0) continue;

            var mout = holding.CreateMovement();
            mout.Cost = holding.AverageValue;
            mout.Date = DateTime.Now;
            mout.Employee.ID = App.EmployeeID;

            var min = mout.CreateMovement();
            min.Cost = holding.AverageValue;
            min.Employee.ID = App.EmployeeID;
            min.Date = mout.Date;
            min.Transaction = mout.Transaction;

            if(qty.Value > 0)
            {
                mout.Issued = qty.Value;
                mout.Type = StockMovementType.TransferOut;

                min.Received = qty.Value;
                min.Type = StockMovementType.TransferIn;
            }
            else
            {
                min.Issued = -qty.Value;
                min.Type = StockMovementType.TransferOut;

                mout.Received = -qty.Value;
                mout.Type = StockMovementType.TransferIn;
            }

            modify(requi, mout, min);

            updates.Add(mout);
            updates.Add(min);
        }
    }

    private void ReleaseAllocatedStock_Click(StockHolding holding)
    {
        var requiitems = holding.LoadRequisitionItems(true).Where(x => x.ID != Guid.Empty).ToList();
        var win = new StockHoldingRelocationWindow(holding, requiitems, StockHoldingRelocationWindow.RelocationMode.ReleaseAllocations);
        if (win.ShowDialog() == true)
        {
            var quantities = win.GetQuantities();

            DoTransfer(holding, requiitems, x => quantities.TryGetValue(x.ID, out var value) ? value : null, (requi, mout, min) =>
            {
                mout.JobRequisitionItem.ID = requi.ID;
                mout.Notes = $"Released from Job Requisition {requi.Requisition.Number}: {requi.Requisition.Description} for Job {requi.Job.JobNumber}";

                min.JobRequisitionItem.ID = Guid.Empty;
                min.Notes = $"Released from Job Requisition {requi.Requisition.Number}: {requi.Requisition.Description} for Job {requi.Job.JobNumber}";
            });
        }
    }
    
    private void RelocateItems(StockHolding holding, JobRequisitionItem[] requiitems)
    {
        var win = new StockHoldingRelocationWindow(holding, requiitems, StockHoldingRelocationWindow.RelocationMode.Transfer)
        {
            OriginalTarget = new StockLocation
            {
                ID = holding.Location.ID,
                Code = holding.Location.Code,
                Description = holding.Location.Description,
            },
            OriginalJob = new Job
            {
                ID = holding.Job.ID,
                JobNumber = holding.Job.JobNumber,
                Name = holding.Job.Name
            }
        };
        if (win.ShowDialog() == true)
        {
            var quantities = win.GetQuantities();
            var target = win.GetTargetLocation();

            DoTransfer(holding, requiitems, x => quantities.TryGetValue(x.ID, out var qty) ? qty : null, (requi, mout, min) =>
            {
                mout.JobRequisitionItem.ID = requi.ID;
                mout.Notes = $"Moved to {target.Code} by {App.EmployeeName}";

                min.Location.Clear();
                min.Location.ID = target.ID;
                min.Job.CopyFrom(win.Job ?? new());
                min.JobRequisitionItem.ID = requi.ID;
                min.Notes = $"Moved From {holding.Location.Code} by {App.EmployeeName}";
            });
        }
    }

    private void ViewRequisitions_Click(CoreRow? row)
    {
        if (row is null) return;

        var holding = row.ToObject<StockHolding>();

        var grid = (DynamicGridUtils.CreateDynamicGrid(typeof(DynamicDataGrid<>), typeof(JobRequisitionItem)) as DynamicDataGrid<JobRequisitionItem>)!;
        grid.OnDefineFilter += (type) =>
        {
            if(type == typeof(JobRequisitionItem))
            {
                return new Filter<JobRequisitionItem>(x => x.ID)
                    .InQuery(
                        StockHolding.GetFilter(holding),
                        x => x.JobRequisitionItem.ID)
                    // We don't care about stuff which has nothing in stock, which means it's been either issued or cancelled.
                    .And(x => x.InStock).IsNotEqualTo(FilterConstant.Zero);
            }
            else
            {
                return null;
            }
        };
        DynamicGridUtils.CreateGridWindow("Job Requisition Items for stock holding", grid).ShowDialog();
    }

    private bool ReceiveStock(Button arg1, CoreRow[] rows)
    {
        var movement = new StockMovement();
        movement.Location.ID = Location.ID;
        movement.Location.Code = Location.Code;
        movement.Job.ID = Location.Job.ID;
        movement.Job.JobNumber = Location.Job.JobNumber;
        movement.Job.Name = Location.Job.Name;
        movement.Location.Description = Location.Description;
        movement.Date = DateTime.Now;
        movement.Employee.ID = App.EmployeeID;
        movement.Type = StockMovementType.Receive;

        movement.CommitChanges();

        var holding = rows.FirstOrDefault()?.ToObject<StockHolding>();
        var smg = CheckStockMovementGrid(MovementAction.Receive, holding);
        var result = smg.EditItems(new[] { movement });

        if (result)
        {
            DoChanged();
            SaveBatch(StockMovementBatchType.Receipt, new StockMovement[] { movement});
        }
           
        return result;
    }
    private bool IssueStock(Button arg1, CoreRow[] rows)
    {
        if (rows?.Length != 1)
        {
            MessageWindow.ShowMessage("Please select an item to issue", "No selected items");
            return false;
        }
        
        var holding = rows.First().ToObject<StockHolding>();
        var items = holding.LoadRequisitionItems(true).AsArray();

        DoIssue(holding, items);
        return false;
    }

    private IEnumerable<StockMovement> CreateIssue(StockHolding holding, IJob? job, double qty, IJobRequisitionItem requi)
    {
        var issue = CreateMovementFromHolding(holding);
        issue.Job.ID = job?.ID ?? Guid.Empty;
        issue.Type = StockMovementType.Issue;
        issue.JobRequisitionItem.ID = requi.ID;
        issue.Issued = qty;
        issue.Notes = $"Issued by {App.EmployeeName}";
        issue.Date = DateTime.Now;
        yield return issue;

        if (holding.Job.ID != issue.Job.ID)
        {
            var xferout = CreateMovementFromHolding(holding);
            xferout.Type = StockMovementType.TransferOut;
            xferout.JobRequisitionItem.ID = requi.ID;
            xferout.Issued = qty;
            xferout.Transaction = issue.Transaction;
            xferout.System = true;
            xferout.Notes = $"Issued by {App.EmployeeName}";
            xferout.Date = issue.Date;
            yield return xferout;
            
            var xferin = CreateMovementFromHolding(holding);
            xferin.Job.ID = issue.Job.ID;
            xferin.Type = StockMovementType.TransferIn;
            xferin.JobRequisitionItem.ID = requi.ID;
            xferin.Received = qty;
            xferin.Transaction = issue.Transaction;
            xferin.System = true;
            xferin.Notes = $"Issued by {App.EmployeeName}";
            xferin.Date = issue.Date;
            yield return xferin;
        }
    }

    private void DoIssue(StockHolding holding, JobRequisitionItem[] requiitems)
    {
        var updates = new List<StockMovement>();

        var win = new StockHoldingRelocationWindow(holding, requiitems, StockHoldingRelocationWindow.RelocationMode.Issue)
        {
            OriginalJob = new Job
            {
                ID = holding.Job.ID,
                JobNumber = holding.Job.JobNumber
            }
        };
        if (win.ShowDialog() == true)
        {
            var quantities = win.GetQuantities();

            foreach(var requi in requiitems)
            {
                if (!quantities.TryGetValue(requi.ID, out var qty) || qty <= 0) continue;

                updates.AddRange(CreateIssue(holding, win.Job, qty, requi));
            }
            SaveBatch(StockMovementBatchType.Issue, updates);
            DoChanged();
            Refresh(false,true);
        }
    }
    
    private bool TransferStock(Button arg1, CoreRow[] rows)
    {
        if (rows?.Length != 1)
            return false;
        
        var holding = rows.First().ToObject<StockHolding>();
        var items = holding.LoadRequisitionItems(true).AsArray();

        RelocateItems(holding, items);
        return false;
    }

    private bool RelocateStock(Button btn, CoreRow[] rows)
    {
        StockLocation? target = null;
        while(true)
        {
            target = StockHoldingRelocationWindow.LookupLocation();
            if(target is null)
            {
                return false;
            }
            else if(target.ID == Location.ID)
            {
                MessageWindow.ShowMessage($"These items are already in {target.Code}; please select a different location.", "Invalid transfer");
            }
            else
            {
                break;
            }
        }

        var holdings = rows.ToArray<StockHolding>();
        var updates = new List<StockMovement>();
        foreach(var holding in holdings)
        {
            var items = holding.LoadRequisitionItems(true).AsIList();

            var rIDs = items.Select(x => x.ID).Where(x => x != Guid.Empty).ToArray();
            var quantities = Client.Query(
                StockHolding.GetFilter(holding)
                    .Combine(new Filter<StockMovement>(x => x.JobRequisitionItem.ID).InList(rIDs)),
                Columns.None<StockMovement>().Add(x => x.Units).Add(x => x.JobRequisitionItem.ID))
                .ToObjects<StockMovement>().GroupBy(x => x.JobRequisitionItem.ID).ToDictionary(x => x.Key, x => x.Sum(x => x.Units));

            DoTransfer(holding, items, x => x.ID == Guid.Empty ? x.Qty : quantities.GetValueOrDefault(x.ID), (requi, mThis, mThat) =>
            {
                mThis.JobRequisitionItem.ID = requi.ID;
                mThis.Notes = $"Moved to {target.Code} by {App.EmployeeName}";

                mThat.JobRequisitionItem.ID = requi.ID;
                mThat.Notes = $"Moved to {target.Code} by {App.EmployeeName}";
                mThat.Location.Clear();
                mThat.Location.ID = target.ID;
            }, updates);
        }

        SaveBatch(StockMovementBatchType.Transfer, updates);
        DoChanged();
        Refresh(false, true);
        return true;
    }

    protected override void DoEdit()
    {
        var holding = SelectedRows.FirstOrDefault()?.ToObject<StockHolding>();
        if (holding is null) return;

        var movement = CreateMovementFromHolding(holding);
        movement.Received = holding.Available;
        movement.Type = StockMovementType.TransferIn;

        var smg = CheckStockMovementGrid(MovementAction.Transfer, holding);
        var result = smg.EditItems(new[] { movement });

        var mvts = new List<StockMovement>
        {
            movement
        };

        if (result)
        {
            var other = CreateMovementFromHolding(holding);
            other.Issued = movement.Received;
            other.Transaction = movement.Transaction;
            other.Type = StockMovementType.TransferOut;

            var changes = new List<string>();
            if (movement.Location.ID != other.Location.ID)
                changes.Add(movement.Location.Code);
            if (movement.Job.ID != other.Job.ID)
                changes.Add(string.IsNullOrEmpty(movement.Job.JobNumber) ? "General Stock" : movement.Job.JobNumber);
            if (movement.Style.ID != other.Style.ID)
                changes.Add(movement.Style.Code);
            //other.Notes = "Transferred to "+String.Join(" / ",changes);
            other.Notes = string.Format("Transferred to {0}{1}{2}", string.Join(" / ",
                    changes.Where(x => !string.IsNullOrWhiteSpace(x))),
                string.IsNullOrWhiteSpace(movement.Notes) ? "" : "\n",
                string.Join("\n", movement.Notes.Split('\n').Where(x => !x.StartsWith("Transferred from ")))
            );

            other.System = true;

            Client.Save(other, "");

            mvts.Add(other);
        }

        if (result)
        {
            DoChanged();
            SaveBatch(StockMovementBatchType.Transfer, mvts.ToArray());
        }
        Refresh(false, true);
    }

    public IStockLocation Location { get; set; }

    protected override void SelectItems(CoreRow[]? rows)
    {
        base.SelectItems(rows);

        var nRows = rows?.Length ?? 0;

        ReceiveButton.IsEnabled = Location != null && Location.ID != Guid.Empty;
        IssueButton.IsEnabled = Location != null && Location.ID != Guid.Empty && nRows > 0;

        if(Location is null || Location.ID == Guid.Empty || nRows == 0)
        {
            TransferButton.IsEnabled = false;
            RelocateButton.IsEnabled = false;
        }
        else if(nRows == 1)
        {
            TransferButton.IsEnabled = true;
            RelocateButton.IsEnabled = true;
        }
        else
        {
            TransferButton.IsEnabled = false;
            RelocateButton.IsEnabled = true;
        }

        var _groups = rows?.GroupBy(x => new Tuple<Guid, double>(
            x.Get<StockHolding, Guid>(c => c.Product.ID),
            x.Get<StockHolding, double>(c => c.Dimensions.Value))
        );
        AdjustValueButton.IsEnabled = Location != null && Location.ID != Guid.Empty && _groups?.Count() == 1;
        RecalculateButton.IsEnabled = Location != null && Location.ID != Guid.Empty;
    }

    protected override void Reload(
    	Filters<StockHolding> criteria, Columns<StockHolding> columns, ref SortOrder<StockHolding>? sort,
    	CancellationToken token, Action<CoreTable?, Exception?> action)
    {
        ReceiveButton.IsEnabled = Location != null && Location.ID != Guid.Empty;
        if (Location == null)
            criteria.Add(new Filter<StockHolding>().None());
        else
            criteria.Add(new Filter<StockHolding>(x => x.Location.ID).IsEqualTo(Location.ID));
        base.Reload(criteria, columns, ref sort, token, action);
    }

    #region Internal Utilities

    private StockMovement CreateMovementFromHolding(StockHolding holding)
    {
        var movement = new StockMovement();
        movement.Date = DateTime.Now;
        movement.Location.ID = Location.ID;
        movement.Location.Code = Location.Code;
        movement.Location.Description = Location.Description;
        movement.Product.ID = holding.Product.ID;
        movement.Job.ID = holding.Job.ID;
        movement.Job.JobNumber = holding.Job.JobNumber;
        movement.Style.ID = holding.Style.ID;
        movement.Style.Code = holding.Style.Code;
        movement.Employee.ID = App.EmployeeID;
        movement.Dimensions.CopyFrom(holding.Dimensions);
        movement.Cost = holding.AverageValue;
        movement.CommitChanges();
        return movement;
    }

    private static void SaveBatch(StockMovementBatchType type, IList<StockMovement> movements)
    {
        var batch = new StockMovementBatch();
        batch.Type = type;
        batch.Notes = batch.Type + " batch created from Desktop Stock Location Screen";
        batch.Employee.ID = App.EmployeeID;
        new Client<StockMovementBatch>().Save(batch, "created from Desktop Stock Location Screen");

        foreach (var mvt in movements)
        { 
            mvt.Batch.ID = batch.ID;
        }

        new Client<StockMovement>().Save(movements, "Updating batch from Desktop Stock Location Screen");
    }


    #endregion

    #region StockMovementGrid

    private DynamicDataGrid<StockMovement> CheckStockMovementGrid(MovementAction action, StockHolding holding)
    {
        _action = action;
        _holding = holding;
        if (smg == null)
        {
            smg = new DynamicDataGrid<StockMovement>();
            smg.OnCustomiseEditor += StockMovementCustomiseEditor;
            smg.OnValidate += StockMovementValidate;
            smg.OnEditorValueChanged += StockMovementValueChanged;
        }
        return smg;
    }
    
    private Dictionary<string, object?> StockMovementValueChanged(IDynamicEditorForm form, string name, object value)
    {
        var result = new Dictionary<string, object?>();
        if (name.Equals("Location.Job.ID"))
        {
            var editor = form.FindEditor("Job.ID");
            if (!value.Equals(Guid.Empty))
                result = DynamicGridUtils.UpdateEditorValue(form.Items, "Job.ID", value);
            else
                foreach (StockMovement item in form.Items)
                    result = DynamicGridUtils.UpdateEditorValue(new[] { item }, "Job.ID",
                        item.Job.HasOriginalValue("ID") ? item.Job.GetOriginalValue(x => x.ID) : item.Job.ID);
            editor.IsEnabled = value.Equals(Guid.Empty);
        }

        return result;
    }
    
    private void StockMovementValidate(object sender, StockMovement[] items, List<string> errors)
    {
        if (items.Any(x => x.Received == 0 && x.Issued == 0))
        {
            errors.Add("Quantity may not be zero");
        }
        else if(_action == MovementAction.Issue && _holding is not null && items.Any(x => x.Issued > _holding.Available))
        {
            errors.Add($"Quantity may not be greater than available stock ({_holding.Available})");
        }

        if (items.Any(x => x.Product.ID == Guid.Empty))
            errors.Add("Product may not be blank");
        if (items.Any(x => x.Location.ID == Guid.Empty))
            errors.Add("Location may not be blank");

        if (!errors.Any() && _action == MovementAction.Transfer)
            foreach (var item in items)
            {
                var changes = new List<string>();
                if (item.Location.HasOriginalValue(x => x.ID))
                    changes.Add(item.Location.GetOriginalValue(x => x.Code));

                if (item.Job.HasOriginalValue(x => x.ID))
                {
                    var job = item.Job.GetOriginalValue(x => x.JobNumber);
                    if (string.IsNullOrEmpty(job))
                        job = "General Stock";
                    changes.Add(job);
                }

                if (item.Style.HasOriginalValue(x => x.ID))
                    changes.Add(item.Style.GetOriginalValue(x => x.Code));

                if (changes.Any())
                    item.Notes = string.Format("Transferred from {0}{1}{2}",
                        string.Join(" / ", changes.Where(x => !string.IsNullOrWhiteSpace(x))),
                        string.IsNullOrWhiteSpace(item.Notes) ? "" : "\n", item.Notes);
                else
                    errors.Add("Transfers must change either Location, Style or Job");
            }
    }

    private void StockMovementCustomiseEditor(IDynamicEditorForm sender, StockMovement[]? items, DynamicGridColumn column, BaseEditor editor)
    {
        if (column.ColumnName.Equals("Location.ID"))
            editor.Editable = _action == MovementAction.Transfer ? Editable.Enabled : Editable.Hidden;
        
        if (column.ColumnName.Equals("Product.ID"))
            editor.Editable = _action == MovementAction.Receive ? Editable.Enabled : Editable.Disabled;
        
        if (column.ColumnName.Equals("Product.NettCost"))
            editor.Editable = Editable.Hidden;
        
        if (column.ColumnName.Equals("Style.ID"))
            editor.Editable = _action == MovementAction.Receive || _action == MovementAction.Transfer ? Editable.Enabled : Editable.Hidden;

        if (column.ColumnName.Equals("UnitSize"))
            editor.Editable = _action == MovementAction.Receive ? Editable.Enabled : Editable.Hidden;
        
        if (column.ColumnName.Equals("Job.ID"))
            editor.Editable = _action == MovementAction.Receive && items?.FirstOrDefault()?.Job.IsValid() == true ? Editable.Disabled : Editable.Enabled;
        
        if (column.ColumnName.Equals(nameof(StockMovement.Received)))
        {
            editor.Editable = _action == MovementAction.Receive || _action == MovementAction.Transfer  ? Editable.Enabled : Editable.Hidden;
            editor.Caption = "Quantity";
        }
        if (column.ColumnName.Equals(nameof(StockMovement.Issued)))
        {
            editor.Editable = _action == MovementAction.Issue ? Editable.Enabled : Editable.Hidden;
            editor.Caption = "Quantity";
        }
        
    }

    #endregion
}