using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Wpf;
using InABox.WPF;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Linq.Expressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using Brush = System.Windows.Media.Brush;

namespace PRSDesktop;

public delegate void JobRequiItemSelect(CoreRow[] rows);

public delegate void GridRefresh();

public class ReservationManagementItemGrid : DynamicDataGrid<JobRequisitionItem>
{
    private readonly ReservationManagementUserSettings _userSettings = new ReservationManagementUserSettings();

    private Button ArchiveButton;
    
    public bool ShowColors { get; set; } 
    
    public int DueDateAlert { get; set; }
    public int DueDateWarning { get; set; }

    protected override bool ShowSequenceButtons => false;

    private class UIComponent : DynamicGridGridUIComponent<JobRequisitionItem>
    {
        private ReservationManagementItemGrid Grid;

        public UIComponent(ReservationManagementItemGrid grid)
        {
            Grid = grid;
            Parent = grid;
        }

        protected override Brush? GetCellBackground(CoreRow row, DynamicColumnBase column)
        {
            if (!Grid.ShowColors) return null;

            if (column is DynamicGridColumn col)
            {
                if (String.Equals(col.ColumnName,
                        CoreUtils.GetFullPropertyName<JobRequisitionItem, DateTime>(x => x.Requisition.DueDate, ".")))
                {
                    var due = row.Get<JobRequisitionItem, DateTime>(x => x.Requisition.DueDate);
                    if (!due.IsEmpty())
                    {
                        var background = DateTime.Today > due.Date
                            ? Colors.LightSalmon
                            : DateTime.Today.AddDays(Grid.DueDateWarning) >= due.Date
                                ? Colors.Orange
                                : DateTime.Today.AddDays(Grid.DueDateAlert) >= due.Date
                                    ? Colors.LightYellow
                                    : Colors.LightGreen;
                        return new SolidColorBrush(background) { Opacity = 0.5 };
                    }
                }
            }
            else if(column is DynamicActionColumn dac)
            {
                if (dac == Grid.InStockColumn
                    || dac == Grid.OnOrderColumn)
                {
                    return Colors.LightBlue.ToBrush(0.5);
                }
                else if (dac == Grid.TreatmentRequiredColumn
                    || dac == Grid.TreatmentOnOrderColumn)
                {
                    return Colors.Plum.ToBrush(0.5);
                }
            }

            var qty = row.Get<JobRequisitionItem, double>(x => x.Qty);
            if(row.Get<JobRequisitionItem, double>(x => x.Issued) >= qty)
            {
                return Colors.Silver.ToBrush(0.5);
            }
            else if(row.Get<JobRequisitionItem, double>(x => x.Allocated) + row.Get<JobRequisitionItem, double>(x => x.Issued) >= qty)
            {
                return Colors.LightGreen.ToBrush(0.5);
            }
            else if(row.Get<JobRequisitionItem, double>(x => x.InStock) + row.Get<JobRequisitionItem, double>(x => x.Issued) >= qty)
            {
                return Colors.Orange.ToBrush(0.5);
            }
            else
            {
                return Colors.LightSalmon.ToBrush(0.5);
            }
        }
    }

    private DynamicActionColumn InStockColumn;
    private DynamicActionColumn OnOrderColumn;
    private DynamicActionColumn TreatmentRequiredColumn;
    private DynamicActionColumn TreatmentOnOrderColumn;
    private DynamicActionColumn AllocatedColumn;
    private DynamicActionColumn IssuedColumn;

    public ReservationManagementItemGrid()
    {
        _userSettings = new UserConfiguration<ReservationManagementUserSettings>().Load();
        FilterComponent.SetSettings(_userSettings.Filters, false);

        HiddenColumns.Add(x => x.ID);

        HiddenColumns.Add(x => x.Qty);
        HiddenColumns.Add(x => x.InStock);
        HiddenColumns.Add(x => x.OnOrder);
        HiddenColumns.Add(x => x.TreatmentOnOrder);
        HiddenColumns.Add(x => x.TreatmentRequired);
        HiddenColumns.Add(x => x.Allocated);
        HiddenColumns.Add(x => x.Issued);

        HiddenColumns.Add(x => x.Product.ID);
        HiddenColumns.Add(x => x.Product.Code);
        HiddenColumns.Add(x => x.Product.Group.ID);
        HiddenColumns.Add(x => x.Product.Group.Code);
        HiddenColumns.Add(x => x.Product.Group.Description);
        HiddenColumns.Add(x => x.Style.ID);
        HiddenColumns.Add(x => x.Style.Code);
        HiddenColumns.Add(x => x.Style.Description);
        HiddenColumns.Add(x => x.Status);
        HiddenColumns.Add(x => x.Requisition.ID);
        HiddenColumns.Add(x => x.Requisition.Job.ID);
        HiddenColumns.Add(x => x.Requisition.Job.JobNumber);
        HiddenColumns.Add(x => x.Requisition.Job.Name);
        HiddenColumns.Add(x => x.Requisition.Number);
        HiddenColumns.Add(x => x.Requisition.DueDate);
        HiddenColumns.Add(x => x.Job.ID);
        HiddenColumns.Add(x => x.Job.Name);
        HiddenColumns.Add(x => x.Job.JobNumber);
        HiddenColumns.Add(x => x.Dimensions.UnitSize);
        HiddenColumns.Add(x => x.Dimensions.Length);
        HiddenColumns.Add(x => x.Dimensions.Width);
        HiddenColumns.Add(x => x.Dimensions.Height);
        HiddenColumns.Add(x => x.Dimensions.Weight);
        HiddenColumns.Add(x => x.Dimensions.Quantity);
        HiddenColumns.Add(x => x.Dimensions.Value);
        HiddenColumns.Add(x => x.Dimensions.Unit.ID);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasLength);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasHeight);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasWidth);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasWeight);
        HiddenColumns.Add(x => x.Dimensions.Unit.HasQuantity);
        HiddenColumns.Add(x => x.Dimensions.Unit.Formula);
        HiddenColumns.Add(x => x.Dimensions.Unit.Format);
        HiddenColumns.Add(x => x.Dimensions.Unit.Code);
        HiddenColumns.Add(x => x.Dimensions.Unit.Description);

        AddDoubleColumn(x => x.Qty, "Qty.");
        InStockColumn = AddDoubleColumn(x => x.InStock, "Stk.");
        OnOrderColumn = AddDoubleColumn(x => x.OnOrder, "Ord.");
        TreatmentRequiredColumn = AddDoubleColumn(x => x.TreatmentRequired, "Req.");
        TreatmentOnOrderColumn = AddDoubleColumn(x => x.TreatmentOnOrder, "Ord.");
        AllocatedColumn = AddDoubleColumn(x => x.Allocated, "Stk.");
        IssuedColumn = AddDoubleColumn(x => x.Issued, "Iss.");

        if (Security.CanEdit<JobRequisitionItem>())
            ActionColumns.Add(new DynamicMenuColumn(BuildMenu));

        ColumnsTag = "JobRequisitionReview";

        FilterComponent.OnFiltersSelected += GridOnFilterSelected;

        ArchiveButton = AddButton("Archive", PRSDesktop.Resources.archive.AsBitmapImage(), ArchiveButton_Clicked);
        ArchiveButton.IsEnabled = false;
    }

    private DynamicActionColumn AddDoubleColumn(Expression<Func<JobRequisitionItem, object>> property, string header)
    {
        var col = new DynamicTextColumn<JobRequisitionItem>(property) { Format = "F2", HeaderText = header, Width = 50 };
        ActionColumns.Add(col);
        return col;
    }

    protected override IDynamicGridUIComponent<JobRequisitionItem> CreateUIComponent()
    {
        return new UIComponent(this);
    }

    protected override void DoReconfigure(DynamicGridOptions options)
    {
        base.DoReconfigure(options);

        options.FilterRows = true;
        options.SelectColumns = true;
        options.RecordCount = true;
        options.DragSource = true;
        options.AddRows = false;
        options.ImportData = false;
        options.ExportData = false;
        options.Print = false;
        options.ShowHelp = false;
    }
    
    private void GridOnFilterSelected(DynamicGridSelectedFilterSettings settings)
    {
        new UserConfiguration<ReservationManagementUserSettings>().Save(new ReservationManagementUserSettings { Filters = settings });
        Refresh(false, true);
    }

    public override DynamicGridColumns GenerateColumns()
    {
        var columns = new DynamicGridColumns();
        columns.Add<JobRequisitionItem, DateTime>(x => x.Requisition.DueDate, 80, "Due", "", Alignment.MiddleCenter);
        columns.Add<JobRequisitionItem, string>(x => x.Requisition.Job.JobNumber, 70, "Job", "", Alignment.MiddleCenter);
        columns.Add<JobRequisitionItem, int>(x => x.Requisition.Number, 50, "Requi", "", Alignment.MiddleCenter);
        columns.Add<JobRequisitionItem, string>(x => x.Product.Code, 100, "Product Code", "", Alignment.MiddleLeft);
        columns.Add<JobRequisitionItem, string>(x => x.Product.Name, 0, "Product Name", "", Alignment.MiddleLeft);
        columns.Add<JobRequisitionItem, string>(x => x.Style.Code, 100, "Style", "", Alignment.MiddleLeft);
        columns.Add<JobRequisitionItem, string>(x => x.Dimensions.UnitSize, 70, "Size", "", Alignment.MiddleLeft);
        columns.Add<JobRequisitionItem, JobRequisitionItemStatus>(x => x.Status, 90, "Status", "", Alignment.MiddleCenter);

        return columns;
    }

    protected override void ConfigureColumnGroups()
    {
        GetColumnGrouping()
            .AddGroup("Stock", InStockColumn, OnOrderColumn)
            .AddGroup("Treatment", TreatmentRequiredColumn, TreatmentOnOrderColumn)
            .AddGroup("Allocated", AllocatedColumn, IssuedColumn);
    }

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

        if(rows?.Any() == true)
        {
            ArchiveButton.IsEnabled = true;
        }
    }

    #region Action Column Buttons

    private void BuildMenu(DynamicMenuColumn column, CoreRow? row)
    {
        column.AddItem("Order Required", PRSDesktop.Resources.purchase, OrderRequired_Clicked);
        column.AddItem("Split Line", PRSDesktop.Resources.split, SplitLine_Clicked);
        column.AddItem("Archive", PRSDesktop.Resources.archive, Archive_Clicked);
        if (Security.CanView<StockMovement>())
        {
            column.AddSeparator();
            column.AddItem("View Stock Movements", PRSDesktop.Resources.forklift, ViewStockMovements);
        }
    }

    private bool CheckValidAction(JobRequisitionItem item)
    {
        bool valid = true;
        if (item.Status == JobRequisitionItemStatus.Allocated)
        {
            MessageWindow.ShowMessage("Item has already been reserved!", "Error", image: MessageWindow.WarningImage);
            return false;
        }
        else if (item.Status == JobRequisitionItemStatus.OnOrder)
        {
            MessageWindow.ShowMessage("Item is already on order!", "Error", image: MessageWindow.WarningImage);
            return false;
        }
        else if (item.InStock >= item.Qty)
        {
            MessageWindow.ShowMessage("Item is already in stock!", "Error", image: MessageWindow.WarningImage);
            return false;
        }
        return valid;
    }

    private void SplitLine(JobRequisitionItem item, double oldItemQty, double newItemQty, string notes)
    {
        var items = new List<JobRequisitionItem>();

        var newItem = new JobRequisitionItem();

        newItem.Job.CopyFrom(item.Job);

        newItem.Requisition.ID = item.Requisition.ID;
        newItem.Requisition.Job.ID = item.Requisition.Job.ID;

        newItem.Product.ID = item.Product.ID;

        newItem.Dimensions.CopyFrom(item.Dimensions);
        newItem.Style.ID = item.Style.ID;

        newItem.Notes = item.Notes + Environment.NewLine + notes;
        item.Notes = newItem.Notes;

        item.Qty = oldItemQty;
        newItem.Qty = newItemQty;

        items.Add(newItem);
        items.Add(item);

        Client.Save(items, "Split lines from Job Requi Item Review Dashboard");
        MessageWindow.ShowMessage($"Line split - original line Qty is now {item.Qty}. New line Qty is {newItem.Qty}", "Lines split");

        Refresh(false, true);
    }

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

        var item = row.ToObject<JobRequisitionItem>();
        if (CheckValidAction(item))
        {
            var units = item.Qty - item.InStock;
            if(DoubleEdit.Execute("Enter amount to split", 1, units, ref units))
            {
                SplitLine(item, item.Qty - units, units, "Line split");
            }
        }
    }

    private static bool Archive(IEnumerable<JobRequisitionItem> items)
    {
        var itemsList = items.AsIList();

        var toChange = new List<JobRequisitionItem>();
        foreach(var item in itemsList)
        {
            if (item.Status != JobRequisitionItemStatus.Allocated)
            {
                var win = MessageWindow.New()
                    .Message($"Requisition item for requisition {item.Requisition.Number} is not fully allocated; " +
                    $"its current status is {item.Status}. Are you sure you wish to archive this item?")
                    .Title("Confirm Archive")
                    .AddYesButton("Archive");
                if(itemsList.Count > 1)
                {
                    win.AddNoButton("Skip");
                }
                var result = win
                    .AddCancelButton()
                    .Display().Result;

                if (result == MessageWindowResult.Cancel)
                {
                    return false;
                }
                else if(result == MessageWindowResult.Yes)
                {
                    toChange.Add(item);
                }
            }
            else
            {
                toChange.Add(item);
            }
        }
        if(toChange.Count == 0)
        {
            MessageWindow.ShowMessage("No items archived.", "Cancelled");
            return false;
        }

        foreach(var item in toChange)
        {
            item.Archived = DateTime.Now;
            item.Notes += Environment.NewLine + "Line marked as Archived by " + App.EmployeeName + " on " + DateTime.Now.ToString("dd MMM yy");
        }

        Client.Save(toChange, "Updated From Job Requisition Review Dashboard");

        return true;
    }

    private bool ArchiveButton_Clicked(Button _btn, CoreRow[] rows)
    {
        return Archive(rows.ToObjects<JobRequisitionItem>());
    }

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

        if (Archive(CoreUtils.One(row.ToObject<JobRequisitionItem>())))
        {
            Refresh(false, true);
        }
    }

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

        var item = row.ToObject<JobRequisitionItem>();
        if (CheckValidAction(item))
        {
            item.OrderRequired = DateTime.Now;
            item.Notes += Environment.NewLine + "Line marked as Order Required by " + App.EmployeeName + " on " + DateTime.Now.ToString("dd MMM yy");

            Client.Save(item, "Updated From Job Requisition Review Dashboard");

            Refresh(false, true);
        }
    }

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

        var requiID = row.Get<StockMovement, Guid>(x => x.ID);

        DynamicDataGrid<StockMovement> grid;
        if (DynamicGridUtils.TryFindDynamicGrid(typeof(DynamicDataGrid<>), typeof(StockMovement), out var gridType))
        {
            grid = (Activator.CreateInstance(gridType) as DynamicDataGrid<StockMovement>)!;
        }
        else
        {
            grid = new DynamicDataGrid<StockMovement>();
            grid.OnReconfigure += (options) =>
            {
                options.SelectColumns = true;
            };
            grid.Reconfigure();
        }

        grid.OnDefineFilter += (t) => new Filter<StockMovement>(x => x.JobRequisitionItem.ID).IsEqualTo(requiID);
        var window = DynamicGridUtils.CreateGridWindow("Stock movements", grid);
        window.ShowDialog();
    }

    #endregion

    protected override void Reload(Filters<JobRequisitionItem> criteria, Columns<JobRequisitionItem> columns, ref SortOrder<JobRequisitionItem>? sort, Action<CoreTable?, Exception?> action)
    {
        criteria.Add(new Filter<JobRequisitionItem>(x => x.Requisition.Approved).IsNotEqualTo(DateTime.MinValue));

        criteria.Add(new Filter<JobRequisitionItem>(x => x.Archived).IsEqualTo(DateTime.MinValue));
        criteria.Add(new Filter<JobRequisitionItem>(x => x.Cancelled).IsEqualTo(DateTime.MinValue));

        sort = new SortOrder<JobRequisitionItem>(x => x.Requisition.Number, SortDirection.Descending);
        base.Reload(criteria, columns, ref sort, action);
    }

    protected override DragDropEffects OnRowsDragStart(CoreRow[] rows)
    {
        // Only allow dragging the selected rows.
        var selected = SelectedRows.Select(x => x.Get<JobRequisitionItem, Guid>(x => x.ID)).ToHashSet();
        var draggedRows = rows.Where(x => selected.Contains(x.Get<JobRequisitionItem, Guid>(x => x.ID))).ToArray();

        if(draggedRows.Length == 0)
        {
            return DragDropEffects.None;
        }
        else
        {
            return base.OnRowsDragStart(draggedRows);
        }
    }
}

public class JobRequiReviewDashboardFilterItem
{
    public Guid SupplierID { get; set; }
    public Guid ProductID { get; set; }
    public string Text { get; set; }

    public JobRequiReviewDashboardFilterItem()
    {
        SupplierID = Guid.Empty;
        ProductID = Guid.Empty;
        Text = "";
    }
}