using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Microsoft.Office.Interop.Outlook;
using Exception = System.Exception;

namespace PRSDesktop
{
    public class StockHoldingGrid : DynamicDataGrid<StockHolding>
    {
        private readonly Guid _employeeid = Guid.Empty;

        private bool bIssuing;

        private bool bReceiving;

        //bool bReserving = false;

        private readonly bool bReleasing = false;

        private bool bTransferring;

        private Button IssueButton;

        private Button ReceiveButton;

        private DynamicDataGrid<StockMovement> smg;

        //Button ReserveButton = null;

        private Button TransferButton;

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

            _employeeid = GetEmployeeID();
        }
        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;

            OnSelectItem += SelectItem;

            HiddenColumns.Add(x => x.Product.ID);
            HiddenColumns.Add(x => x.Product.Deleted);
            HiddenColumns.Add(x => x.Job.ID);
            HiddenColumns.Add(x => x.Job.JobNumber);
            HiddenColumns.Add(x => x.Job.Deleted);
            HiddenColumns.Add(x => x.Location.ID);
            HiddenColumns.Add(x => x.Location.Code);
            HiddenColumns.Add(x => x.Location.Deleted);
            HiddenColumns.Add(x => x.Style.ID);
            HiddenColumns.Add(x => x.Style.Code);
            HiddenColumns.Add(x => x.Style.Deleted);
            HiddenColumns.Add(x => x.Qty);
            HiddenColumns.Add(x => x.Units);
            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);
        }
        protected override void DoReconfigure(FluentList<DynamicGridOption> options)
        {
            base.DoReconfigure(options);
            options.AddRange(DynamicGridOption.RecordCount, DynamicGridOption.SelectColumns, DynamicGridOption.FilterRows);
        }

        public IStockLocation Location { get; set; }


        private void SelectItem(object sender, DynamicGridSelectionEventArgs e)
        {
            ReceiveButton.IsEnabled = Location != null && Location.ID != Guid.Empty;
            IssueButton.IsEnabled = Location != null && Location.ID != Guid.Empty && e.Rows?.Any() == true;
            TransferButton.IsEnabled = Location != null && Location.ID != Guid.Empty && e.Rows?.Any() == true;
        }

        private void CheckStockMovementGrid()
        {
            if (smg == null)
            {
                smg = new DynamicDataGrid<StockMovement>();
                smg.OnCustomiseEditor += StockMovementCustomiseEditor;
                smg.OnValidate += StockMovementValidate;
                smg.OnEditorValueChanged += StockMovementValueChanged;
            }
        }

        private Guid GetEmployeeID()
        {
            var employee = new Client<Employee>().Query(
                new Filter<Employee>(x => x.UserLink.ID).IsEqualTo(ClientFactory.UserGuid),
                new Columns<Employee>(x => x.ID)
            );
            return employee.Rows.Any() ? employee.Rows.First().Get<Employee, Guid>(x => x.ID) : Guid.Empty;
        }

        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)
        {
            var bQty = false;
            //bool bJob = false;
            var bProd = false;
            var bLocn = false;
            var bStyle = false;
            
            foreach (var item in items)
            {
                bQty = bQty || (item.Received == 0 && item.Issued == 0);
                bProd = bProd || !item.Product.IsValid();
                bLocn = bLocn || !item.Location.IsValid();
                bStyle = bStyle || !item.Style.IsValid();
            }

            if (bQty)
                errors.Add("Quantity may not be zero");
            if (bProd)
                errors.Add("Product may not be blank");
            if (bLocn)
                errors.Add("Location may not be blank");

            //if (bStyle)
            //    result.Add("Style may not be blank");

            if (!errors.Any() && bTransferring)
                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 = bTransferring ? Editable.Enabled : Editable.Hidden;

            if (column.ColumnName.Equals("Product.NettCost"))
                editor.Editable = Editable.Hidden;

            if (column.ColumnName.Equals("Style.ID"))
                editor.Editable = bReceiving || bTransferring ? Editable.Enabled : Editable.Hidden;

            if (column.ColumnName.Equals("Received"))
            {
                editor.Editable = bReceiving || bTransferring || bReleasing ? Editable.Enabled : Editable.Hidden;
                editor.Caption = "Quantity";
            }

            if (column.ColumnName.Equals("Product.ID"))
                editor.Editable = bReceiving ? Editable.Enabled : Editable.Hidden;

            if (column.ColumnName.Equals("UnitSize"))
                editor.Editable = bReceiving ? Editable.Enabled : Editable.Hidden;

            if (column.ColumnName.Equals("Job.ID"))
                editor.Editable = bReceiving && items?.FirstOrDefault()?.Job.IsValid() == true ? Editable.Disabled : Editable.Enabled;

            if (column.ColumnName.Equals("Issued"))
            {
                editor.Editable = bIssuing ? Editable.Enabled : Editable.Hidden;
                editor.Caption = "Quantity";
            }

            if (column.ColumnName.Equals("Employee.ID"))
                editor.Editable = bTransferring || bReleasing ? Editable.Hidden : Editable.Enabled;

            if (column.ColumnName.Equals("Units"))
                editor.Editable = Editable.Hidden;
            
            if (column.ColumnName.Equals("Units"))
                editor.Editable = bReceiving ? Editable.Enabled : Editable.Hidden;
        }

        private bool ReceiveStock(Button arg1, CoreRow[] rows)
        {
            CheckStockMovementGrid();
            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.IsTransfer = false;
            movement.Employee.ID = _employeeid;
            movement.Type = StockMovementType.Receive;

            movement.CommitChanges();

            bReceiving = true;
            var result = smg.EditItems(new[] { movement });
            bReceiving = false;

            if (result)
            {
                DoChanged();
                SaveBatch(StockMovementBatchType.Receipt, new StockMovement[] { movement});
            }
               
            return result;
        }

        private void SaveBatch(StockMovementBatchType type, StockMovement[] movements)
        {
            StockMovementBatch batch = new StockMovementBatch();
            batch.Type = type;
            batch.Notes = batch.Type + " batch created from Desktop Stock Location Screen";
            batch.Employee.ID = _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");
        }

        private bool IssueStock(Button arg1, CoreRow[] rows)
        {
            if (!rows.Any())
            {
                MessageBox.Show("Please select an item to issue");
                return false;
            }

            CheckStockMovementGrid();

            var holding = rows.First().ToObject<StockHolding>();
            // var jobid = rows.First().Get<StockHolding, Guid>(x => x.Job.ID);
            // var jobno = rows.First().Get<StockHolding, string>(x => x.Job.JobNumber);
            // var productid = rows.First().Get<StockHolding, Guid>(x => x.Product.ID);
            // var styleid = rows.First().Get<StockHolding, Guid>(x => x.Style.ID);
            // var stylecode = rows.First().Get<StockHolding, string>(x => x.Style.Code);
            // var size = rows.First().Get<StockHolding, double>(x => x.UnitSize);

            var movement = new StockMovement
            {
                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.Dimensions.CopyFrom(holding.Dimensions);
            movement.IsTransfer = false;
            movement.Employee.ID = _employeeid;
            movement.Cost = holding.AverageValue;
            movement.Type = StockMovementType.Issue;

            movement.CommitChanges();

            bIssuing = true;
            var result = smg.EditItems(new[] { movement });
            bIssuing = false;

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

            // Issuing to a different job than you received into?
            if (result && holding.Job.ID != movement.Job.ID)
            {
                // Issue from Old Job (Hidden)
                var issue = new StockMovement
                {
                    Date = movement.Date
                };
                issue.Product.ID = holding.Product.ID;
                issue.Job.ID = holding.Job.ID;
                issue.Location.ID = Location.ID;
                issue.Style.ID = holding.Style.ID;
                issue.Issued = movement.Issued;
                issue.Transaction = movement.Transaction;
                issue.Employee.ID = movement.Employee.ID;
                issue.Dimensions.CopyFrom(holding.Dimensions);
                issue.IsTransfer = true;
                issue.Notes = string.Format("Transferred from {0}", holding.Job.ID.Equals(Guid.Empty) ? "General Stock" : "Job " + holding.Job.JobNumber);
                issue.System = true;
                issue.Cost = holding.AverageValue;
                issue.Type = StockMovementType.TransferOut;

                // Receive to New Job (Hidden)
                var receive = new StockMovement();
                receive.Date = movement.Date;
                receive.Product.ID = holding.Product.ID;
                receive.Job.ID = movement.Job.ID;
                receive.Location.ID = Location.ID;
                receive.Style.ID = holding.Style.ID;
                receive.Received = movement.Issued;
                receive.Transaction = movement.Transaction;
                receive.Employee.ID = movement.Employee.ID;
                receive.Dimensions.CopyFrom(holding.Dimensions);
                receive.IsTransfer = true;
                receive.Notes = string.Format("Transferred to {0}",
                    !movement.Job.IsValid() ? "General Stock" : "Job " + movement.Job.JobNumber);
                receive.System = true;
                receive.Cost = holding.AverageValue;
                receive.Type = StockMovementType.TransferIn;

                new Client<StockMovement>().Save(new[] { issue, receive }, "");
                mvts.Add(issue);
                mvts.Add(receive);
            }

            if (result)
            {
                DoChanged();
                SaveBatch(StockMovementBatchType.Issue, mvts.ToArray());
            }
            return result;
        }

        private bool TransferStock(Button arg1, CoreRow[] rows)
        {
            CheckStockMovementGrid();

            var holding = rows.First().ToObject<StockHolding>();
            // var jobid = rows.First().Get<StockHolding, Guid>(x => x.Job.ID);
            // var jobno = rows.First().Get<StockHolding, string>(x => x.Job.JobNumber);
            // var productid = rows.First().Get<StockHolding, Guid>(x => x.Product.ID);
            // var styleid = rows.First().Get<StockHolding, Guid>(x => x.Style.ID);
            // var stylecode = rows.First().Get<StockHolding, string>(x => x.Style.Code);
            // var units = rows.First().Get<StockHolding, double>(x => x.Units);
            // var size = rows.First().Get<StockHolding, double>(x => x.UnitSize);

            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 = _employeeid;
            // Must happen before Received gets set so that OnPropertyChanged has stuff to work with and thus Qty is not zero.
            movement.Dimensions.CopyFrom(holding.Dimensions);
            movement.Received = holding.Units;
            movement.IsTransfer = true;
            movement.Cost = holding.AverageValue;
            movement.Type = StockMovementType.TransferIn;

            movement.CommitChanges();

            bTransferring = true;
            var result = smg.EditItems(new[] { movement });
            bTransferring = false;

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

            if (result)
            {
                var other = new StockMovement();
                other.Date = movement.Date;
                other.Product.ID = holding.Product.ID;
                other.Job.ID = holding.Job.ID;
                other.Cost = holding.AverageValue;

                other.Location.ID = Location.ID;
                //other.Location.Code = Location.Code;
                //other.Location.Description = Location.Description;

                other.Style.ID = holding.Style.ID;
                other.Issued = movement.Received;
                other.Transaction = movement.Transaction;
                other.Employee.ID = movement.Employee.ID;
                other.Dimensions.CopyFrom(holding.Dimensions);
                other.IsTransfer = true;
                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;

                new Client<StockMovement>().Save(other, "");

                mvts.Add(other);
            }

            if (result)
            {
                DoChanged();
                SaveBatch(StockMovementBatchType.Transfer, mvts.ToArray());
            }
            return result;
        }

        //private bool ReserveStock(Button arg1, CoreRow[] rows)
        //{
        //    if (!rows.Any())
        //    {
        //        MessageBox.Show("Please select an item to transfer");
        //        return false;
        //    }

        //    CheckStockMovementGrid();

        //    Guid jobid = rows.First().Get<StockHolding, Guid>(x => x.Job.ID);
        //    String jobno = rows.First().Get<StockHolding, String>(x => x.Job.JobNumber);
        //    Guid productid = rows.First().Get<StockHolding, Guid>(x => x.Product.ID);
        //    Guid styleid = rows.First().Get<StockHolding, Guid>(x => x.Style.ID);
        //    double units = rows.First().Get<StockHolding, double>(x => x.Units);
        //    double size = rows.First().Get<StockHolding, double>(x => x.UnitSize);
        //    StockMovement movement = new StockMovement();
        //    movement.Date = DateTime.Now;
        //    movement.Location.ID = LocationID;
        //    movement.Product.ID = productid;
        //    movement.Style.ID = styleid;
        //    movement.Employee.ID = GetEmployeeID();
        //    movement.Job.ID = Guid.Empty;
        //    movement.Received = units;
        //    movement.UnitSize = size;

        //    bReserving = jobid.Equals(Guid.Empty);
        //    bReleasing = !bReserving;

        //    movement.Notes = bReserving ? "Reserving Stock" : "Releasing from Job " + jobno;

        //    bool result = smg.EditItems(new StockMovement[] { movement });


        //    Issuing to a different job than you received into ?
        //    if (result)
        //    {
        //        Issue from Old Job(Hidden)
        //        StockMovement other = new StockMovement();
        //        other.Date = movement.Date;
        //        other.Product.ID = productid;
        //        other.Job.ID = jobid;
        //        other.Location.ID = LocationID;
        //        other.Style.ID = styleid;
        //        other.Issued = movement.Received;
        //        other.Transaction = movement.Transaction;
        //        other.Employee.ID = movement.Employee.ID;
        //        other.UnitSize = size;
        //        other.Notes = movement.Job.ID.Equals(Guid.Empty) ? "Releasing back to General Stock" : "Reserving for Job " + movement.Job.JobNumber;
        //        other.System = true;

        //        new Client<StockMovement>().Save(other, "");
        //    }

        //    bReserving = false;
        //    bReleasing = false;

        //    if (result)
        //        OnChanged?.Invoke(this);
        //    return result;
        //}

        protected override void Reload(Filters<StockHolding> criteria, Columns<StockHolding> columns, ref SortOrder<StockHolding>? sort, 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, action);
        }

        protected override bool FilterRecord(CoreRow row)
        {
            // Hackety Hackety Hack Hack stupid doubles not totalling zero when they're supposed to
            var result = base.FilterRecord(row);
            if (result)
                result = Math.Abs(row.Get<StockHolding, double>(x => x.Qty)) >= 0.000001;//.ToString("F8").Equals("0.00000000");
            return result;
        }
    }
}