using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;

namespace PRSDesktop.Panels.Requisitions;

/// <summary>
/// Interaction logic for RequisitionItemEditor.xaml
/// </summary>
public partial class RequisitionItemEditor : INotifyPropertyChanged
{
    private readonly RequisitionItem Item;
    public RequisitionItem[]? Result { get; private set; }

    private bool _loadedAllocations;
    private bool _loadedStockHoldings;
    private bool _loadedProductInstances;
    private bool _loadedBOMItems;
    private bool _loadedJobRequisitionItems;
    private bool _loadedCustom;

    private bool _allowActual;
    
    private bool _canSave;
    public bool CanSave
    {
        get => _canSave;
        private set
        {
            _canSave = value;
            OnPropertyChanged();
        }
    }

    public RequisitionItemEditor(Func<List<Product>> products, RequisitionItem requisitionItem, bool allowActual)
    {
        _allowActual = allowActual;
        
        Item = requisitionItem;
        
        InitializeComponent();

        StockHoldingProducts.ProductsFunction = products;
        ProductInstancesProducts.ProductsFunction = products;
        BOMItems.Item = requisitionItem;
        JobRequisitionItemsGrid.Item = requisitionItem;

        AllocationsPage.Visibility = _allowActual && requisitionItem.Product.ID != Guid.Empty
            ? Visibility.Visible
            : Visibility.Collapsed;
        
        HoldingsPage.Visibility = _allowActual && requisitionItem.SourceJRI.ID == Guid.Empty ? Visibility.Visible : Visibility.Collapsed;
        InstancesPage.Visibility = _allowActual ? Visibility.Collapsed : Visibility.Visible;
        BOMPage.Visibility = _allowActual 
            ? Visibility.Collapsed 
            : Visibility.Visible;
        RequisitionPage.Visibility = _allowActual 
            ? Visibility.Collapsed 
            : Visibility.Visible;
        

        TabControl.SelectedItem  = requisitionItem.EditType == RequisitionItemEditType.Normal 
            ? _allowActual 
                ? requisitionItem.Product.ID != Guid.Empty
                    ? AllocationsPage
                    : HoldingsPage
                : requisitionItem.JobRequisitionItem.ID == Guid.Empty
                    ? BOMPage
                    : RequisitionPage
            : CustomPage;
        CanSave = false;
        UpdateState();
    }
    
    private void UpdateState()
    {

        if (TabControl.SelectedTab == AllocationsPage)
        {
            if (!_loadedAllocations)
            {
                LoadAllocations();
                _loadedAllocations = true;
            }
        }
        else if(TabControl.SelectedTab == HoldingsPage)
        {
            if (!_loadedStockHoldings)
            {
                LoadStockHoldings();
                _loadedStockHoldings = true;
            }
        }
        else if(TabControl.SelectedTab == BOMPage)
        {
            if (!_loadedBOMItems)
            {
                LoadBOMItems();
                _loadedBOMItems = true;
            }
        }
            
        else if(TabControl.SelectedTab == RequisitionPage)
        {
            if (!_loadedJobRequisitionItems)
            {
                LoadJobRequisitionItems();
                _loadedJobRequisitionItems = true;
            }
        }
        else if(TabControl.SelectedTab == InstancesPage)
        {
            if (!_loadedProductInstances)
            {
                LoadProductInstances();
                _loadedProductInstances = true;
            }
        }
        else if (TabControl.SelectedTab == CustomPage)
        {
            if (!_loadedCustom)
            {
                LoadCustom();
                _loadedCustom = true;
            }
        }
        CheckCanSave();
    }
    
    private void CheckCanSave()
    {
        if (TabControl.SelectedTab == AllocationsPage)
            CanSave = CanSaveAllocations();
        else if (TabControl.SelectedTab == HoldingsPage)
            CanSave = CanSaveStockHoldings();
        else if (TabControl.SelectedTab == BOMPage)
            CanSave = CanSaveBOMItems();
        else if (TabControl.SelectedTab == RequisitionPage)
            CanSave = CanSaveJobRequisitionItems();
        else if (TabControl.SelectedTab == InstancesPage)
            CanSave = CanSaveProductInstances();
        else if (TabControl.SelectedTab == CustomPage)
            CanSave = true;
    }
    
    private void DoSave()
    {
        if (TabControl.SelectedTab == AllocationsPage)
            SaveAllocations();
        else if (TabControl.SelectedTab == HoldingsPage)
            SaveStockHoldings();
        else if (TabControl.SelectedTab == BOMPage)
            SaveBOMItems();
        else if (TabControl.SelectedTab == RequisitionPage)
            SaveJobRequisitionItems();
        else if (TabControl.SelectedTab == InstancesPage)
            SaveProductInstances();
        else if (TabControl.SelectedTab == CustomPage)
            SaveCustom();
    }
    private void OKButton_Click(object sender, RoutedEventArgs e)
    {
        DoSave();
        DialogResult = true;
        Close();
    }

    private void CancelButton_Click(object sender, RoutedEventArgs e)
    {
        Item.CancelChanges();
        DialogResult = false;
        Close();
    }
    
    private void TabChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.OriginalSource == sender)
            UpdateState();
    }

    #region Allocations
    
    private IEnumerable<StockSelectionItem> CreateStockSelectionItems(IEnumerable<IGrouping<Guid, StockMovement>> groups, Func<StockMovement,string> description)
    {
        
        var _result = new List<StockSelectionItem>();
        foreach (var _group in groups)
        {
            var _units = _group.Sum(x => x.Units);
            if (!_units.IsEffectivelyEqual(0.0))
            {
                var _holding = new StockHolding();
                _holding.Location.ID = _group.Key;
                _holding.Location.Synchronise(_group.FirstOrDefault()?.Location ?? new StockLocationLink());
                _holding.Product.ID = Item.Product.ID;
                _holding.Product.Synchronise(Item.Product);
                _holding.Style.ID = Item.Style.ID;
                _holding.Style.Synchronise(Item.Style);
                _holding.Dimensions.CopyFrom(Item.Dimensions);
                _holding.Location.Area.Code = description(_group.FirstOrDefault() ?? new StockMovement());
                _holding.Units = _units;
                var _jri = new JobRequisitionItem()
                {
                    ID = _group.FirstOrDefault()?.JobRequisitionItem.ID ?? Guid.Empty
                };
                _result.Add(new StockSelectionItem() { Holding = _holding, MaxValue = Item.Quantity, JRI = _jri });
            }
        }
        return _result;
    }
    
    private void LoadAllocations()
    {
        var movements = Client.Query(
            new Filter<StockMovement>(x=>x.Product.ID).IsEqualTo(Item.Product.ID)
                .And(x=>x.Style.ID).IsEqualTo(Item.Style.ID)
                .And(x=>x.Dimensions).DimensionEquals(Item.Dimensions)
                .And(
                    new Filter<StockMovement>(x => x.JobRequisitionItem.ID).IsEqualTo(Item.SourceJRI.ID)
                        .Or(new Filter<StockMovement>(x => x.Job.ID).IsEqualTo(Item.RequisitionLink.JobLink.ID)
                                .And(x => x.JobRequisitionItem.ID).IsEqualTo(Guid.Empty))
                        .Or(new Filter<StockMovement>(x => x.Job.ID).IsEqualTo(Guid.Empty)
                                .And(x => x.JobRequisitionItem.ID).IsEqualTo(Guid.Empty))
            ),
            Columns.None<StockMovement>()
                .Add(x => x.Location.ID)
                .Add(x => x.Location.Code)
                .Add(x => x.Location.Description)
                .Add(x => x.Job.ID)
                .Add(x=>x.Job.JobNumber)
                .Add(x=>x.Job.Name)
                .Add(x => x.JobRequisitionItem.ID)
                .Add(x=>x.JobRequisitionItem.Requisition.Number)
                .Add(x=>x.JobRequisitionItem.Requisition.Description)
                .Add(x => x.Units)
        ).Rows.Select(x=>x.ToObject<StockMovement>()).ToArray();
        
        List<StockSelectionItem> items = new();
        
        var allocations = movements.Where(x => x.JobRequisitionItem.ID == Item.SourceJRI.ID)
            .GroupBy(x => x.Location.ID);
        items.AddRange(
            CreateStockSelectionItems(
                allocations, 
                (m) => $"{m.Job.JobNumber}:{m.JobRequisitionItem.Requisition.Number} {m.JobRequisitionItem.Requisition.Description}"
            )
        );
        
        // if the pickinglist does not have a job, skip this bit
        var reserves = movements.Where(x =>
                x.JobRequisitionItem.ID != Guid.Empty && x.Job.ID == Item.RequisitionLink.JobLink.ID &&
                x.JobRequisitionItem.ID == Guid.Empty)
            .GroupBy(x => x.Location.ID);
        items.AddRange(
            CreateStockSelectionItems(
                reserves, 
                (m) => $"{m.Job.JobNumber} (Unallocated Stock)"
            )
        );
        
        var freeitems = movements.Where(x => x.Job.ID == Guid.Empty && x.JobRequisitionItem.ID == Guid.Empty)
            .GroupBy(x => x.Location.ID);
        items.AddRange(
            CreateStockSelectionItems(
                freeitems, 
                (m) => $"General Stock"
            )
        );

        Allocations.Items = items;
        Allocations.Refresh(true,true);
    }
    
    private void Allocations_OnAfterRefresh(object sender, AfterRefreshEventArgs args)
    {
        UpdateMaximums();
    }

    private void UpdateMaximums()
    {
        foreach (var item in Allocations.Items)
            item.MaxValue = Item.Quantity + item.Issued - Allocations.Items.Sum(x=>x.Issued);
    }

    private void Allocations_OnPropertyChanged(object? sender, PropertyChangedEventArgs e)
    {
        UpdateMaximums();
        CheckCanSave();
    }
    
    private bool CanSaveAllocations()
    {
        return Allocations.Items.Sum(x=>x.Issued).IsEffectivelyGreaterThan(0.0);
    }

    private RequisitionItem CopyRequisitionItem()
    {
        var newItem = new RequisitionItem();
        newItem.Done = Item.Done;
        newItem.Image.CopyFrom(Item.Image);
        newItem.RequisitionLink.ID = Item.RequisitionLink.ID;
        newItem.SourceJRI.ID = Item.SourceJRI.ID;
        newItem.Product.CopyFrom(Item.Product);
        newItem.Style.CopyFrom(Item.Style);
        newItem.Location.CopyFrom(Item.Location);
        newItem.JobRequisitionItem.ID = Item.JobRequisitionItem.ID;
        newItem.Dimensions.CopyFrom(Item.Dimensions, true);
        newItem.JobLink.CopyFrom(Item.JobLink);
        newItem.Description = Item.Description;
        newItem.Quantity = Item.Quantity;
        newItem.EditType = RequisitionItemEditType.Normal;
        return newItem;
    }
    
    private void SaveAllocations()
    {
        var remainder = Item.Quantity;
        var newItems = new List<RequisitionItem>();
        
        foreach(var item in Allocations.Items.Where(x=>!x.Issued.IsEffectivelyEqual(0.0)))
        {
            var newItem = newItems.Count == 0 ? Item : CopyRequisitionItem();
            newItem.Location.CopyFrom(item.Holding.Location);
            newItem.JobRequisitionItem.CopyFrom(item.JRI);
            newItem.JobLink.CopyFrom(item.Holding.Job);
            
            // Automagically attach to Requisition if it seems appropriate
            // ie selected from a JRI allocation, and current source jri is blank
            if (newItem.SourceJRI.ID == Guid.Empty
                && newItem.RequisitionLink.JobLink.ID == item.Holding.Job.ID
                && item.JRI.ID != Guid.Empty)
                newItem.SourceJRI.ID = item.JRI.ID;

            newItem.Quantity = item.Issued;
            newItem.ActualQuantity = item.Issued;
            newItem.Done = true;
            remainder -= item.Issued;
            newItems.Add(newItem);
        }
        
        if(!remainder.IsEffectivelyEqual(0.0))
        {
            var newItem = CopyRequisitionItem();
            newItem.Location.CopyFrom(new StockLocationLink());
            newItem.JobRequisitionItem.CopyFrom(new JobRequisitionItemLink());
            newItem.JobLink.CopyFrom(new JobLink());
            newItem.Quantity = remainder;
            newItem.Done = false;
            newItems.Add(newItem);
        }

        Client.Save(newItems, "Updated from RequisitionItemEditor(Allocations)");

        Result = newItems.ToArray();
        
    }


    #endregion
    
    #region StockHoldings

    private void LoadStockHoldings()
    {
        StockHoldingProducts.Refresh(true, true);

        foreach(var column in StockHolding.Columns)
        {
            StockHoldings.HiddenColumns.Add(column);
        }
        foreach(var column in Columns.None<StockHolding>()
            .AddSubColumns(x => x.Product, LookupFactory.DefineLookupColumns<RequisitionItem, Product, ProductLink>(x => x.Product).CastIntersection<ProductLink>())
            .AddSubColumns(x => x.Style, LookupFactory.DefineLookupColumns<RequisitionItem, ProductStyle, ProductStyleLink>(x => x.Style).CastIntersection<ProductStyleLink>())
            .AddSubColumns(x => x.Location, LookupFactory.DefineLookupColumns<RequisitionItem, StockLocation, StockLocationLink>(x => x.Location).CastIntersection<StockLocationLink>())
            .AddSubColumns(x => x.Job, LookupFactory.DefineLookupColumns<RequisitionItem, Job, JobLink>(x => x.JobLink).CastIntersection<JobLink>())
            )
        {
            StockHoldings.HiddenColumns.Add(column);
        }
        StockHoldings.HiddenColumns.Add(x => x.Available);

        StockHoldings.Refresh(true, false);

        if(Item.Product.ID != Guid.Empty)
        {
            // Delaying, cause otherwise it doesn't work.
            Dispatcher.BeginInvoke(() =>
            {
                StockHoldingProducts.SelectedRows = StockHoldingProducts.Data.Rows.Where(x => x.Get<Product, Guid>(x => x.ID) == Item.Product.ID).ToArray();
                StockHoldingProducts.ScrollIntoView(StockHoldingProducts.SelectedRows[0]);
            });
        }
    }

    private void StockHoldingProducts_OnSelectItem(object sender, InABox.DynamicGrid.DynamicGridSelectionEventArgs e)
    {
        StockHoldings.Product = e.Rows is not null && e.Rows.Length > 0 ? e.Rows[0].ToObject<Product>() : null;
        StockHoldings.Refresh(false, true);

        CheckCanSave();
    }

    private void StockHoldings_OnAfterRefresh(object sender, AfterRefreshEventArgs args)
    {
        var row = StockHoldings.Data.Rows.FirstOrDefault();
        if (row != null)
        {
            StockHoldings.SelectedRows = new CoreRow[] { row };
            SelectHolding(new CoreRow[] { row });
        }
    }

    private void StockHoldings_OnSelectItem(object sender, InABox.DynamicGrid.DynamicGridSelectionEventArgs e)
    {
        SelectHolding(e.Rows);
    }

    private void SelectHolding(CoreRow[]? rows)
    {
        StockHolding = rows?.FirstOrDefault()?.ToObject<StockHolding>();
        RefreshJobRequisitionItems();

        JRIRow.Height = _allowActual && StockHolding is not null ? new GridLength(1, GridUnitType.Star) : new GridLength(0);
        TotalRow.Height = _allowActual && StockHolding is not null ? new GridLength(40) : new GridLength(0);
        RequiredEditor.SetValue(Grid.ColumnProperty, _allowActual && StockHolding is not null ? 4 : 6);
        CheckCanSave();
    }

    private bool CanSaveStockHoldings()
    {
        return StockHolding is not null && TotalTaken > 0;
    }

    private void SaveStockHoldings()
    {
        if (StockHolding is null) return;
        var items = JRIItems.Where(x => x.Taken > 0).ToArray();
        if (items.Length == 0) return;

        Item.Product.CopyFrom(StockHolding.Product);
        Item.Style.CopyFrom(StockHolding.Style);
        Item.Location.CopyFrom(StockHolding.Location);
        Item.Dimensions.CopyFrom(StockHolding.Dimensions, true);
        Item.JobLink.CopyFrom(StockHolding.Job);
        Item.EditType = RequisitionItemEditType.Normal;

        var remainder = Item.Quantity;

        var newItems = new List<RequisitionItem>();
        foreach(var item in items)
        {
            RequisitionItem newItem;
            if(newItems.Count == 0)
            {
                newItem = Item;
            }
            else
            {
                newItem = new RequisitionItem();
                newItem.Done = Item.Done;
                newItem.Description = Item.Description;
                newItem.Image.CopyFrom(Item.Image);
                newItem.RequisitionLink.ID = Item.RequisitionLink.ID;
                newItem.JobRequisitionItem.ID = item.ID;
                newItem.Product.CopyFrom(Item.Product);
                newItem.Style.CopyFrom(Item.Style);
                newItem.Location.CopyFrom(Item.Location);
                newItem.Dimensions.CopyFrom(Item.Dimensions, true);
                newItem.JobLink.CopyFrom(Item.JobLink);
                newItem.EditType = RequisitionItemEditType.Normal;
            }
            newItem.JobRequisitionItem.ID = item.ID;
            newItem.Quantity = item.Taken;
            newItem.ActualQuantity = item.Taken;

            remainder -= item.Taken;

            newItems.Add(newItem);
        }
        if(remainder > 0)
        {
            var newItem = new RequisitionItem();

            newItem.Done = false;
            newItem.Description = Item.Description;
            newItem.Image.CopyFrom(Item.Image);
            newItem.RequisitionLink.ID = Item.RequisitionLink.ID;

            newItem.JobRequisitionItem.ID = Guid.Empty;
            newItem.Product.CopyFrom(Item.Product);
            newItem.Style.CopyFrom(Item.Style);
            newItem.Dimensions.CopyFrom(Item.Dimensions, true);

            newItem.Quantity = remainder;

            newItems.Add(newItem);
        }

        Client.Save(newItems, "Edited by user.");

        Result = newItems.ToArray();
        
    }

    #region JobRequisitionItem Selection

    public event PropertyChangedEventHandler? PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    private bool _observing = false;
    public void SetObserving(bool observing)
    {
        if(_observing != observing)
        {
            _observing = observing;
            if (_observing)
            {
                Recalculate();
            }
        }
    }

    private StockHolding? StockHolding;

    private List<RequisitionItemStockHoldingItem> _jriItems;
    public List<RequisitionItemStockHoldingItem> JRIItems
    {
        get => _jriItems;
        set
        {
            _jriItems = value;
            OnPropertyChanged();
        }
    }

    private void RefreshJobRequisitionItems()
    {
        SetObserving(false);
        if(StockHolding is null)
        {
            JRIItems = [];
        }
        else
        {
            var jris = StockHolding.LoadRequisitionItems(true);
            JRIItems = jris.Select(x =>
            {
                var newItem = new RequisitionItemStockHoldingItem
                {
                    Quantity = x.Qty,
                    Taken = 0,
                    ID = x.ID,
                    Text = x.ID == Guid.Empty
                        ? "General Stock"
                        : $"{x.Job.JobNumber}:{x.Requisition.Number} {x.Requisition.Description} ({x.Qty})",
                };
                newItem.PropertyChanged += (o, e) => Recalculate();
                return newItem;
            }).ToList();
        }
        SetObserving(true);
    }
    
    private void Recalculate()
    {
        if (!_observing) return;

        TotalTaken = JRIItems.Sum(x => x.Taken);
    }

    private double _totalTaken;
    public double TotalTaken
    {
        get => _totalTaken;
        set
        {
            _totalTaken = value;
            OnPropertyChanged();
            CheckCanSave();
        }
    }

    public double RequiredQuantity
    {
        get => Item.Quantity;
        set
        {
            Item.Quantity = value;
            CheckCanSave();
            OnPropertyChanged();
        }
    }


    private void None_Click(object sender, RoutedEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not RequisitionItemStockHoldingItem item) return;

        item.Taken = 0;
    }

    private void Minus_Click(object sender, RoutedEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not RequisitionItemStockHoldingItem item) return;

        item.Taken = Math.Max(0, item.Taken - 1);
    }

    private void Plus_Click(object sender, RoutedEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not RequisitionItemStockHoldingItem item) return;

        item.Taken = Math.Min(item.Taken + 1, item.Quantity);
    }

    private void All_Click(object sender, RoutedEventArgs e)
    {
        if (sender is not FrameworkElement element || element.Tag is not RequisitionItemStockHoldingItem item) return;

        item.Taken = Math.Min(Math.Max(RequiredQuantity - (TotalTaken - item.Taken), 0), item.Quantity);
    }

    #endregion

    #endregion

    #region BOM Items

    private void LoadBOMItems()
    {
        BOMItems.Refresh(true,true);
    }
    
    private bool CanSaveBOMItems()
    {
        return BOMItems.Data.Rows.Any(r =>!r.Get<JobBOMSummary,double>(x=>x.Quantity).IsEffectivelyEqual(0.0));
    }

    private void SaveBOMItems()
    {
        var result = new List<RequisitionItem>() { Item };
        
        var bomItems = BOMItems.Data.Rows
            .Where(r => !r.Get<JobBOMSummary, double>(x => x.Quantity).IsEffectivelyEqual(0.0))
            .Select(r => r.ToObject<JobBOMSummary>()).ToArray();
        
        var first = bomItems.FirstOrDefault();
        if (first is null)
            return;
        
        Item.Product.CopyFrom(first.Product);
        Item.Style.CopyFrom(first.Style);
        Item.Dimensions.CopyFrom(first.Dimensions, true);
        Item.EditType = RequisitionItemEditType.Normal;
        Item.Quantity = first.Quantity;

        foreach (var item in bomItems.Skip(1).ToArray())
        {
            var newItem = new RequisitionItem();
            newItem.RequisitionLink.ID = Item.RequisitionLink.ID;
            newItem.Done = false;
            newItem.Description = item.Product.Name;
            newItem.Product.CopyFrom(item.Product);
            newItem.Style.CopyFrom(item.Style);
            newItem.Dimensions.CopyFrom(item.Dimensions, true);
            newItem.EditType = RequisitionItemEditType.Normal;
            newItem.Quantity = item.Quantity;
            result.Add(newItem);
        }

        Client.Save(result, "Edited by user.");

        Result = result.ToArray();
        
    }

    private void BOMItems_OnOnChanged(object? sender, EventArgs e)
    {
        CheckCanSave();
    }
    
    #endregion
    
    #region Job Requisition Items

    private void LoadJobRequisitionItems()
    {
        JobRequisitionItemsGrid.Refresh(true,true);
    }
    
    private bool CanSaveJobRequisitionItems()
    {
        return JobRequisitionItemsGrid.Data.Rows.Any(r =>!r.Get<JobJRISummary,double>(x=>x.Quantity).IsEffectivelyEqual(0.0));
    }

    private void SaveJobRequisitionItems()
    {
        var result = new List<RequisitionItem>() { Item };
        
        var items = JobRequisitionItemsGrid.Data.Rows
            .Where(r => !r.Get<JobJRISummary, double>(x => x.Quantity).IsEffectivelyEqual(0.0))
            .Select(r => r.ToObject<JobJRISummary>()).ToArray();
        
        var first = items.FirstOrDefault();
        if (first is null)
            return;
        
        Item.Product.CopyFrom(first.JRI.Product);
        Item.Style.CopyFrom(first.JRI.Style);
        Item.Dimensions.CopyFrom(first.JRI.Dimensions, true);
        Item.JobRequisitionItem.CopyFrom(first.JRI);
        Item.EditType = RequisitionItemEditType.Normal;
        Item.Quantity = first.Quantity;

        foreach (var item in items.Skip(1).ToArray())
        {
            var newItem = new RequisitionItem();
            newItem.RequisitionLink.ID = Item.RequisitionLink.ID;
            newItem.Done = false;
            newItem.Description = item.JRI.Product.Name;
            newItem.Product.CopyFrom(item.JRI.Product);
            newItem.Style.CopyFrom(item.JRI.Style);
            newItem.Dimensions.CopyFrom(item.JRI.Dimensions, true);
            newItem.JobRequisitionItem.CopyFrom(item.JRI);
            newItem.EditType = RequisitionItemEditType.Normal;
            newItem.Quantity = item.Quantity;
            result.Add(newItem);
        }

        Client.Save(result, "Edited by user.");

        Result = result.ToArray();
        
    }

    private void JobRequisitionItems_OnOnChanged(object? sender, EventArgs e)
    {
        CheckCanSave();
    }
    
    #endregion

    
    #region Product Instances

    private ProductInstance? SelectedProductInstance;

    private void LoadProductInstances()
    {
        ProductInstancesProducts.Refresh(true, true);

        ProductInstances.Refresh(true, false);
        foreach(var column in Columns.None<ProductInstance>().Add(x => x.Style.ID).AddDimensionsColumns(x => x.Dimensions))
        {
            ProductInstances.HiddenColumns.Add(column);
        }

        if(Item.Product.ID != Guid.Empty)
        {
            // Delaying, cause otherwise it doesn't work.
            Dispatcher.BeginInvoke(() =>
            {
                ProductInstancesProducts.SelectedRows = ProductInstancesProducts.Data.Rows.Where(x => x.Get<Product, Guid>(x => x.ID) == Item.Product.ID).ToArray();
                if (ProductInstancesProducts.SelectedRows.Any())
                    ProductInstancesProducts.ScrollIntoView(ProductInstancesProducts.SelectedRows[0]);
            });
        }
    }

    private bool CanSaveProductInstances()
    {
        return ProductInstances.Product is not null && SelectedProductInstance is not null && RequiredQuantity > 0;
    }

    private void SaveProductInstances()
    {
        if (ProductInstances.Product is null || SelectedProductInstance is null) return;

        Item.Product.CopyFrom(ProductInstances.Product);
        Item.Style.CopyFrom(SelectedProductInstance.Style);
        Item.Dimensions.CopyFrom(SelectedProductInstance.Dimensions, true);
        Item.Location.ID = Guid.Empty;
        Item.EditType = RequisitionItemEditType.Normal;

        Client.Save(Item, "Edited by user.");

        Result = [Item];
        
    }
    private void ProductInstancesProducts_OnSelectItem(object sender, InABox.DynamicGrid.DynamicGridSelectionEventArgs e)
    {
        ProductInstances.Product = e.Rows is not null && e.Rows.Length > 0 ? e.Rows[0].ToObject<Product>() : null;
        ProductInstances.Refresh(false, true);

        CheckCanSave();
    }

    private void ProductInstances_OnSelectItem(object sender, DynamicGridSelectionEventArgs e)
    {
        SelectedProductInstance = e.Rows is not null && e.Rows.Length > 0 ? e.Rows[0].ToObject<ProductInstance>() : null;

        CheckCanSave();
    }

    #endregion

    #region Custom

    private void LoadCustom()
    {
        CustomEditorGrid.Setup(typeof(RequisitionItem));
        CustomEditorGrid.Items = new RequisitionItem[] { Item };
    }

    private static readonly Columns<RequisitionItem> ActualCustomColumns = Columns.None<RequisitionItem>()
        .Add(x => x.Product.ID)
        .Add(x => x.Style.ID)
        .Add(x => x.Dimensions)
        .Add(x => x.Description)
        .Add(x => x.Location.ID)
        .Add(x => x.Quantity)
        .Add(x => x.ActualQuantity);
    
    
    private static readonly Columns<RequisitionItem> RequstedCustomColumns = Columns.None<RequisitionItem>()
        .Add(x => x.Product.ID)
        .Add(x => x.Style.ID)
        .Add(x => x.Dimensions)
        .Add(x => x.Description)
        .Add(x => x.Location.ID)
        .Add(x => x.Quantity)
        .Add(x => x.ActualQuantity);

    // private static readonly Columns<RequisitionItem> ProductInstanceCustomColumns = new Columns<RequisitionItem>()
    //     .Add(x => x.Product.ID)
    //     .Add(x => x.Style.ID)
    //     .Add(x => x.Dimensions)
    //     .Add(x => x.Description)
    //     .Add(x => x.Quantity);

    private void CustomEditorGrid_OnFormCustomiseEditor(IDynamicEditorForm sender, object items, DynamicGridColumn column, BaseEditor editor)
    {
        var columns = _allowActual ? ActualCustomColumns : RequstedCustomColumns;
        editor.Editable = columns.Contains(column.ColumnName)
            ? Editable.Enabled 
            : Editable.Hidden;
    }

    /*
    private void LoadCustom()
    {
        var host = new DefaultDynamicEditorHost<RequisitionItem>
        {
            Items = [Item]
        };

        var editors = new Dictionary<string, IDynamicEditorControl>();

        BaseDynamicEditorControl? CreateControl(Expression<Func<RequisitionItem, object?>> exp, int row)
        {
            var property = DatabaseSchema.Property(exp)!;
            BaseEditor? editor;
            if (property.HasParentEditor())
            {
                property = property.GetParentWithEditor();
            }
            if (property is null) return null;
            editor = property.Editor;

            editor = editor.CloneEditor();

            var control = DynamicEditorControlFactory.CreateControl(editor, host)!;
            Grid.SetRow(control, row);
            Grid.SetColumn(control, 1);
            control.Margin = new Thickness(5, 2.5, 5, 2.5);
            CustomEditorGrid.Children.Add(control);

            editors[property.Name] = control;

            control.IsEnabled = true;

            control.ColumnName = property.Name;
            control.Color = editor is UniqueCodeEditor ? Color.FromArgb(0xFF, 0xF6, 0xC9, 0xE8) : Colors.LightYellow;

            control.Configure();
            control.Loaded = true;

            foreach(var (k, v) in control.GetValues())
            {
                var value = DatabaseSchema.Property(typeof(RequisitionItem), k)!.Getter()(Item);
                if(!Equals(v, value))
                {
                    bool bLoaded = control.Loaded;
                    control.Loaded = false;
                    control.SetValue(k, value);
                    control.Loaded = bLoaded;
                }
            }
            control.OnEditorValueChanged += (sender, values) =>
            {
                var changededitors = new Dictionary<string, object?>();

                void ExtractChanged(Dictionary<string, object?>? columns)
                {
                    if (columns != null)
                        foreach (var (change, value) in columns)
                            if (!changededitors.ContainsKey(change) && !change.Equals(sender.ColumnName))
                                changededitors[change] = value;
                }

                var name = sender.ColumnName;
                var resetAll = false;
                if(values.Remove(name, out var value))
                {
                    var changedcolumns = DynamicGridUtils.UpdateEditorValue([Item], sender.ColumnName, value);

                    resetAll = changedcolumns?.ContainsKey(name) ?? false;
                    ExtractChanged(changedcolumns);
                }

                foreach(var (k, v) in values)
                {
                    var changes = new Dictionary<string, object?>();
                    if (resetAll)
                    {
                        var prop = DatabaseSchema.Property(typeof(RequisitionItem), k);
                        if(prop is not null)
                        {
                            var def = CoreUtils.GetDefault(prop.PropertyType);
                            var resetChanges = DynamicGridUtils.UpdateEditorValue([Item], k, def);
                            if(resetChanges is not null)
                            {
                                changes = resetChanges;
                            }
                        }
                        else
                        {

                        }
                    }
                    var changedOtherColumns = DynamicGridUtils.UpdateEditorValue([Item], k, v);

                    if(changedOtherColumns is not null)
                    {
                        foreach (var (k1, v1) in changedOtherColumns)
                        {
                            changes[k1] = v1;
                        }
                    }

                    ExtractChanged(changes);
                }
                if (changededitors.Count != 0)
                {
                    foreach(var (k, v) in changededitors)
                    {
                        var editor = editors.GetValueOrDefault(k) ?? editors.FirstOrDefault(x => k.StartsWith(x.Key + ".")).Value;
                        if(editor is not null)
                        {
                            editor.Loaded = false;
                            editor.SetValue(k, v);
                            editor.Loaded = true;
                        }
                    }
                }
            };

            return control;
        }

        var productEditor = CreateControl(x => x.Product.ID, 0);
        var styleEditor = CreateControl(x => x.Style.ID, 1);
        var dimensionsEditor = CreateControl(x => x.Dimensions.Quantity, 2);
        var descriptionEditor = CreateControl(x => x.Description, 3);
        var locationEditor = CreateControl(x => x.Location.ID, 4);
        var quantityEditor = CreateControl(x => x.Quantity, 5);
    }
    */

    private void SaveCustom()
    {
        Item.EditType = RequisitionItemEditType.Custom;
        Client.Save(Item, "Custom edited by user.");
        Result = [Item];
    }

    #endregion



}