using Comal.Classes;
using InABox.Core;
using InABox.Wpf;
using InABox.WPF;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using InABox.Configuration;
using InABox.Clients;
using InABox.DynamicGrid;

namespace PRSDesktop;

public class StockForecastOrderScreenSettings : IGlobalConfigurationSettings
{
    public StockForecastOrderingType OrderingType { get; set; } = 
        StockForecastOrderingType.StockOrder;

    public StockForecastOrderingStrategy OrderingStrategy { get; set; } =
        StockForecastOrderingStrategy.LowestOverallPrice;
}

/// <summary>
/// Interaction logic for StockForecastOrderScreen.xaml
/// </summary>
public partial class StockForecastOrderScreen : Window, INotifyPropertyChanged
{
    private StockForecastOrderScreenSettings settings;
    
    private bool _canSave;
    public bool CanSave
    {
        get => _canSave;
        set
        {
            _canSave = true;
            OnPropertyChanged();
        }
    }

    public StockForecastOrderingType OrderType
    {
        get => Grid.OrderType;
        set => Grid.OrderType = value;
    }

    public StockForecastOrderingStrategy Strategy
    {
        get => Grid.OrderStrategy;
        set => Grid.OrderStrategy = value;
    }

    public StockForecastCombineMode CombineMode
    {
        get => Grid.CombineMode;
        set => Grid.CombineMode = value;
    }

    public IEnumerable<StockForecastOrderingResult> Results => Grid.Results;

    public StockForecastOrderScreen(List<StockForecastOrderData> items, bool allowstockOrder = true)
    {
        settings = new GlobalConfiguration<StockForecastOrderScreenSettings>().Load();
        
        InitializeComponent();

        if (allowstockOrder)
        {
            OrderType = settings.OrderingType;

            OrderTypeBox.ItemsSource = Enum.GetValues<StockForecastOrderingType>()
                .Select(x => new KeyValuePair<StockForecastOrderingType, string>(x, CoreUtils.Neatify(x.ToString())));
            OrderTypeBox.SelectedValuePath = "Key";
            OrderTypeBox.DisplayMemberPath = "Value";
            OrderTypeBox.VerticalContentAlignment = VerticalAlignment.Center;
            OrderTypeBox.Bind(ComboBox.SelectedValueProperty, this, x => x.OrderType);
        }
        else
        {
            OrderType = StockForecastOrderingType.Breakup;
            OrderTypeBox.Visibility = System.Windows.Visibility.Collapsed;
            OrderTypeLabel.Visibility = System.Windows.Visibility.Collapsed;
        }

        Strategy = settings.OrderingStrategy;

        OrderStrategyBox.ItemsSource = Enum.GetValues<StockForecastOrderingStrategy>()
            .Select(x => new KeyValuePair<StockForecastOrderingStrategy, string>(x, CoreUtils.Neatify(x.ToString())));
        OrderStrategyBox.SelectedValuePath = "Key";
        OrderStrategyBox.DisplayMemberPath = "Value";
        OrderStrategyBox.VerticalContentAlignment = VerticalAlignment.Center;
        OrderStrategyBox.Bind(ComboBox.SelectedValueProperty, this, x => x.Strategy);

        CombineModeBox.ItemsSource = Enum.GetValues<StockForecastCombineMode>()
            .Select(x => new KeyValuePair<StockForecastCombineMode, string>(x, CoreUtils.Neatify(x.ToString())));
        CombineModeBox.SelectedValuePath = "Key";
        CombineModeBox.DisplayMemberPath = "Value";
        CombineModeBox.VerticalContentAlignment = VerticalAlignment.Center;
        CombineModeBox.Bind(ComboBox.SelectedValueProperty, this, x => x.CombineMode);

        Grid.OrderData = items;
        Grid.Refresh(true, true);
    }

    private void CancelButton_Click(object sender, RoutedEventArgs e)
    {
        DialogResult = false;
        Close();
    }

    private void OKButton_Click(object sender, RoutedEventArgs e)
    {
        DialogResult = true;
        Close();
    }

    public event PropertyChangedEventHandler? PropertyChanged;

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

    private void Grid_OnChanged(object sender, EventArgs e)
    {
        CanSave = Grid.TotalQuantity > 0;
    }

    private void OrderTypeBox_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (Grid.OrderData == null)
            return;
        settings.OrderingType = (StockForecastOrderingType)OrderTypeBox.SelectedValue;
        new GlobalConfiguration<StockForecastOrderScreenSettings>().Save(settings);
    }

    private void OrderStrategyBox_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (Grid.OrderData == null)
            return;
        settings.OrderingStrategy = (StockForecastOrderingStrategy)OrderStrategyBox.SelectedValue;
        new GlobalConfiguration<StockForecastOrderScreenSettings>().Save(settings);
    }

    public void CreateOrders(string screenName)
    {
        var orders = new List<Tuple<PurchaseOrder, Dictionary<StockForecastOrderingResult,PurchaseOrderItem>>>();
        Progress.ShowModal("Creating Orders", progress =>
        {
            int iOrder = 1;
            foreach(var perSupplier in Results.GroupBy(x => x.Supplier.ID))
            {
                progress.Report($"Creating Orders ({iOrder++}/{Results.ToArray().Length})");
                var order = new PurchaseOrder();
                order.Description = $"Purchase Order created from {screenName} Screen";
                order.RaisedBy.ID = App.EmployeeID;

                LookupFactory.DoLookup<PurchaseOrder, Supplier, SupplierLink>(order, x => x.SupplierLink, perSupplier.Key);

                var orderItems = new Dictionary<StockForecastOrderingResult,PurchaseOrderItem>();
                var results = perSupplier.ToArray();
                foreach(var item in results)
                {
                    var orderItem = new PurchaseOrderItem();
                    orderItem.Product.ID = item.Item.Product.ID;
                    orderItem.Style.ID = item.Item.Style.ID;
                    orderItem.Job.ID = item.SupplierProduct.Job.ID;
                    orderItems[item] = orderItem;
                }

                var jobIDs = orderItems.Values.ToArray(x => new Tuple<PurchaseOrderItem, Guid>(x, x.Job.ID));
                var productIDs = orderItems.Values.ToArray(x => new Tuple<PurchaseOrderItem, Guid>(x, x.Product.ID));
                var styleIDs = orderItems.Values.ToArray(x => new Tuple<PurchaseOrderItem, Guid>(x, x.Style.ID));
                var taxCodeIDs = orderItems.Values.ToArray(x => new Tuple<PurchaseOrderItem, Guid>(x, x.TaxCode.ID));

                LookupFactory.DoLookups<PurchaseOrderItem, Job, JobLink>(jobIDs, x => x.Job);
                LookupFactory.DoLookups<PurchaseOrderItem, Product, ProductLink>(productIDs, x => x.Product);
                LookupFactory.DoLookups<PurchaseOrderItem, ProductStyle, ProductStyleLink>(styleIDs, x => x.Style);
                LookupFactory.DoLookups<PurchaseOrderItem, TaxCode, TaxCodeLink>(taxCodeIDs, x => x.TaxCode);

                foreach(var item in results)
                {
                    var orderItem = orderItems[item];
                    orderItem.Dimensions.CopyFrom(item.SupplierProduct.Dimensions);
                    orderItem.Qty = item.Quantity;
                    orderItem.ForeignCurrencyCost = item.SupplierProduct.ForeignCurrencyPrice;
                    orderItem.Cost = item.SupplierProduct.CostPrice;
                }

                orders.Add(new(order, orderItems));
            }
            
            progress.Report($"Saving {orders.Count} Orders");
            Client.Save(orders.Select(x => x.Item1), $"Created from {screenName} screen");
            foreach(var (order, orderItems) in orders)
            {
                foreach(var pair in orderItems)
                    pair.Value.PurchaseOrderLink.ID = order.ID;
            }
            Client.Save(orders.SelectMany(x => x.Item2.Values), $"Created from {screenName} screen");

            var allocations = new List<PurchaseOrderItemAllocation>();
            progress.Report($"Processing Breakups");
            foreach(var (order, orderItems) in orders)
            {
                foreach(var (result, poi) in orderItems)
                {
                    foreach (var breakup in result.Breakups)
                    {
                        // Skip the nominated job.
                        if (breakup.JobID == poi.Job.ID && breakup.JobRequiItemID == Guid.Empty) continue;

                        var alloc = new PurchaseOrderItemAllocation();
                        alloc.Item.ID = poi.ID;
                        alloc.Job.ID = breakup.JobID;
                        alloc.JobRequisitionItem.ID = breakup.JobRequiItemID;
                        alloc.Quantity = breakup.Quantity;
                        allocations.Add(alloc);
                    }
                }
            }
            if (allocations.Count != 0)
                Client.Save(allocations, $"Created from {screenName} Screen");
        });

        MessageWindow.ShowMessage($"The following orders were created:\n- {string.Join("\n- ",orders.Select(x=>x.Item1.PONumber))}", $"Created {orders.Count} orders");
    }

    private void StyleSelectButton_Click(object sender, RoutedEventArgs e)
    {
        var dlg = new MultiSelectDialog<ProductStyle>(
            null,
            Columns.None<ProductStyle>().Add(x => x.ID).Add(x => x.Code),
            multiselect: false);
        var result = dlg.ShowDialog();
        if(result == true)
        {
            Grid.SetStyle(dlg.Data().ToObjects<ProductStyle>().First());
        }
        else if(result == false)
        {
            Grid.SetStyle(null);
        }
    }

    private void Grid_OnSelectItem(object sender, InABox.DynamicGrid.DynamicGridSelectionEventArgs e)
    {
        StyleSelectButton.IsEnabled = e.Rows is not null && e.Rows.Length > 0;
    }

    private void CollapseModeBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

    }
}