using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.WPF;
using Microsoft.Win32;
using net.sf.mpxj;
using net.sf.mpxj.MpxjUtilities;
using net.sf.mpxj.reader;
using Syncfusion.Windows.Controls.Gantt;
using Syncfusion.Windows.Controls.Grid;
using Syncfusion.XlsIO;
using GridSelectionMode = Syncfusion.Windows.Controls.Grid.GridSelectionMode;
using Resource = Syncfusion.Windows.Controls.Gantt.Resource;

namespace PRSDesktop
{
    /// <summary>
    ///     Interaction logic for JobStagesGrid.xaml
    /// </summary>
    public partial class JobStagesPanel : UserControl, IPanel<JobStage>, IJobControl
    {
        private CoreTable _relationships;
        private readonly ObservableCollection<Resource> _resources = new();

        private CoreTable _stages;

        private readonly ObservableCollection<GanttTask> _tasks = new();

        private JobStagesGrid grid;

        public JobStagesPanel()
        {
            InitializeComponent();

            Gantt.ItemsSource = _tasks;
            Gantt.ResourceCollection = _resources;

            AddStage.Content = new Image { Source = PRSDesktop.Resources.add.AsBitmapImage() };
            EditStage.Content = new Image { Source = PRSDesktop.Resources.pencil.AsBitmapImage() };
            ImportFileImage.Source = PRSDesktop.Resources.download.AsBitmapImage();
            ExportFileImage.Source = PRSDesktop.Resources.upload.AsBitmapImage();
            DeleteStage.Content = new Image { Source = PRSDesktop.Resources.delete.AsBitmapImage() };
        }

        public Guid JobID { get; set; }

        public bool IsReady { get; set; }

        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>();
        }

        public string SectionName => "Job Stages";

        public DataModel DataModel(Selection selection)
        {
            return new BaseDataModel<Job>(new Filter<Job>(x => x.ID).IsEqualTo(JobID));
        }

        public void Setup()
        {
            AddStage.Visibility = Security.CanEdit<JobStage>() ? Visibility.Visible : Visibility.Collapsed;
            EditStage.Visibility = Security.CanEdit<JobStage>() ? Visibility.Visible : Visibility.Collapsed;
            ImportFile.Visibility = Security.CanEdit<JobStage>() ? Visibility.Visible : Visibility.Collapsed;
            ExportFile.Visibility = Security.CanEdit<JobStage>() ? Visibility.Visible : Visibility.Collapsed;
            DeleteStage.Visibility = Security.CanEdit<JobStage>() ? Visibility.Visible : Visibility.Collapsed;
        }

        public void CreateToolbarButtons(IPanelHost host)
        {
        }

        public void Shutdown()
        {
        }

        public void Refresh()
        {
            var query = new MultiQuery();
            query.Add(
                new QueryDef<JobStage>(
                    new Filter<JobStage>(x => x.Job.ID).IsEqualTo(JobID),
                    null,
                    new SortOrder<JobStage>(x => x.Sequence)
                ),
                typeof(JobStage)
            );

            query.Add(
                new QueryDef<JobStageRelationship>(
                    new Filter<JobStageRelationship>(x => x.Parent.ID).IsEqualTo(JobID),
                    null,
                    null
                ),
                typeof(JobStageRelationship)
            );

            query.Query();

            _stages = query.Get(typeof(JobStage));
            _relationships = query.Get(typeof(JobStageRelationship));


            LoadStages(Guid.Empty);

            LoadRelationships();
        }

        public event DataModelUpdateEvent OnUpdateDataModel;

        public void Heartbeat(TimeSpan time)
        {
        }

        private void Gantt_TemplateApplied(object sender, TemplateAppliedEventArgs args)
        {
            if (Gantt.GanttGrid != null)
            {
                Gantt.GanttGrid.Model.Options.ListBoxSelectionMode = GridSelectionMode.One;
                Gantt.GanttGrid.Model.Sizer.AllowAutoCalculateSize = true;
                Gantt.GanttGrid.Model.Sizer.ListenToSizeChanged = true;
                Gantt.GanttGrid.Model.Options.ColumnSizer = GridControlLengthUnitType.Star;
                Gantt.GanttGrid.RowHeaderWidth = 0;
                Gantt.GanttGrid.ShowRowHeader = false;

                Gantt.GanttGrid.Columns.Clear();
                //Gantt.GanttGrid.Columns.Add(new Syncfusion.Windows.Controls.Grid.GridTreeColumn("TaskId") { Width = 60F, HeaderText = "#", StyleInfo = new Syncfusion.Windows.Controls.Grid.GridStyleInfo() { VerticalAlignment = VerticalAlignment.Center, HorizontalAlignment = HorizontalAlignment.Center } });
                Gantt.GanttGrid.Columns.Add(new GridTreeColumn("TaskName")
                {
                    Width = 220F, PercentWidth = 100F, HeaderText = "Description",
                    StyleInfo = new GridStyleInfo { VerticalAlignment = VerticalAlignment.Center }
                });
                Gantt.GanttGrid.Columns.Add(new GridTreeColumn("StartDate")
                {
                    Width = 70F, HeaderText = "Start",
                    StyleInfo = new GridStyleInfo
                        { VerticalAlignment = VerticalAlignment.Center, Format = "dd MMM yy", HorizontalAlignment = HorizontalAlignment.Center }
                });
                Gantt.GanttGrid.Columns.Add(new GridTreeColumn("Manpower")
                {
                    Width = 60F, HeaderText = "Hrs",
                    StyleInfo = new GridStyleInfo { VerticalAlignment = VerticalAlignment.Center, HorizontalAlignment = HorizontalAlignment.Center }
                });
                Gantt.GanttGrid.Columns.Add(new GridTreeColumn("Percentage")
                {
                    Width = 40F, HeaderText = "%",
                    StyleInfo = new GridStyleInfo
                        { VerticalAlignment = VerticalAlignment.Center, Format = "#0.##%", HorizontalAlignment = HorizontalAlignment.Center }
                });
                Gantt.GanttGrid.Columns.Add(new GridTreeColumn("FinishDate")
                {
                    Width = 70F, HeaderText = "Due",
                    StyleInfo = new GridStyleInfo
                        { VerticalAlignment = VerticalAlignment.Center, Format = "dd MMM yy", HorizontalAlignment = HorizontalAlignment.Center }
                });
            }
        }

        public void LoadStages(Guid parentid)
        {
            var rows = _stages.Rows.Where(r => r.Get<JobStage, Guid>(c => c.Parent.ID).Equals(parentid));
            foreach (var row in rows)
            {
                var parent = _tasks.FirstOrDefault(x => x.ID.Equals(parentid));
                var task = new GanttTask
                {
                    TaskName = row.Get<JobStage, string>(c => c.Name),
                    StartDate = row.Get<JobStage, DateTime>(c => c.StartDate),
                    FinishDate = row.Get<JobStage, DateTime>(c => c.EndDate),
                    Manpower = TimeSpan.FromHours(row.Get<JobStage, double>(c => c.TotalHours)),
                    ID = row.Get<JobStage, Guid>(c => c.ID),
                    TaskId = (int)row.Get<JobStage, long>(c => c.Sequence)
                };
                if (parent != null)
                    parent.Child.Add(task);
                else
                    _tasks.Add(task);

                LoadStages(task.ID);
            }
        }

        private void LoadRelationships()
        {
            foreach (var row in _relationships.Rows)
            {
                var predtask = _tasks.FirstOrDefault(x => x.ID == row.Get<JobStageRelationship, Guid>(c => c.Predecessor.ID));
                var succtask = _tasks.FirstOrDefault(x => x.ID == row.Get<JobStageRelationship, Guid>(c => c.Successor.ID));
                if (predtask != null && succtask != null)
                {
                    var type = row.Get<JobStageRelationship, GanttRelationshipType>(x => x.Type);
                    var relationship = type == GanttRelationshipType.FinishToFinish
                        ? GanttTaskRelationship.FinishToFinish
                        : type == GanttRelationshipType.FinishToStart
                            ? GanttTaskRelationship.FinishToStart
                            : type == GanttRelationshipType.StartToFinish
                                ? GanttTaskRelationship.StartToFinish
                                : GanttTaskRelationship.StartToStart;
                    succtask.Predecessor.Add(new Predecessor { GanttTaskIndex = predtask.TaskId, GanttTaskRelationship = relationship });
                }
            }
        }

        private void DeleteStage_Click(object sender, RoutedEventArgs e)
        {
            var task = Gantt.SelectedItems.FirstOrDefault() as GanttTask;
            if (task == null)
            {
                MessageBox.Show("Selected Item is Null!");
                return;
            }

            var stageids = new List<Guid> { task.ID };
            var relids = _relationships.Rows
                .Where(r => r.Get<JobStageRelationship, Guid>(c => c.Predecessor.ID).Equals(task.ID) ||
                            r.Get<JobStageRelationship, Guid>(c => c.Successor.ID).Equals(task.ID))
                .Select(r => r.Get<JobStageRelationship, Guid>(c => c.ID)).ToList();
            GetChildren(task.ID, stageids, relids);

            var stages = stageids.Select(x => new JobStage { ID = x }).ToArray();
            new Client<JobStage>().Delete(stages, "");

            var relationships = relids.Select(x => new JobStageRelationship { ID = x }).ToArray();
            new Client<JobStageRelationship>().Delete(relationships, "");

            Refresh();
        }

        private void GetChildren(Guid taskid, List<Guid> stages, List<Guid> relationships)
        {
            var stageids = _stages.Rows.Where(r => r.Get<JobStage, Guid>(c => c.Parent.ID).Equals(taskid))
                .Select(r => r.Get<JobStage, Guid>(c => c.ID));
            var relids = _relationships.Rows
                .Where(r => r.Get<JobStageRelationship, Guid>(c => c.Predecessor.ID).Equals(taskid) ||
                            r.Get<JobStageRelationship, Guid>(c => c.Successor.ID).Equals(taskid))
                .Select(r => r.Get<JobStageRelationship, Guid>(c => c.ID));
            relationships.AddRange(relids.Where(x => !relationships.Contains(x)));

            stageids = stageids.Where(x => !stages.Contains(x)).ToArray();
            foreach (var stageid in stageids)
            {
                stages.Add(stageid);
                GetChildren(stageid, stages, relationships);
            }
        }

        private void AddStage_Click(object sender, RoutedEventArgs e)
        {
            var menu = new ContextMenu();
            var addstage = new MenuItem { Header = "Add Stage to Job" };
            addstage.Click += NewStage_Click;
            menu.Items.Add(addstage);
            if (Gantt.SelectedItems.Any())
            {
                var addtask = new MenuItem { Header = "Add Task to Stage" };
                addtask.Click += NewTaskClick;
                menu.Items.Add(addtask);
            }

            menu.IsOpen = true;
        }

        private void DoEdit(JobStage stage)
        {
            if (grid == null)
                using (new WaitCursor())
                {
                    grid = new JobStagesGrid();
                    grid.OnCustomiseEditor += (o, i, c, e) =>
                    {
                        if (c.ColumnName.Equals("StartDate") || c.ColumnName.Equals("EndDate") || c.ColumnName.Equals("WorkDays"))
                        {
                            var haschild = stage.ID != Guid.Empty && _stages.Rows.Any(r => r.Get<JobStage, Guid>(x => x.Parent.ID) == stage.ID);
                            e.Editable = haschild ? Editable.Hidden : Editable.Enabled;
                        }
                    };
                }

            if (grid.EditItems(new[] { stage })) Refresh();
        }

        //private void CheckParentDates(JobStage stage)
        //{
        //    JobStage parent = Stages.FirstOrDefault(x => x.ID.Equals(stage.Parent.ID));
        //    if (parent != null)
        //    {
        //        // Calculate Start / Finish Dates
        //        DateTime start = stage.StartDate;
        //        DateTime finish = stage.EndDate;
        //        foreach (var child in Stages.Where(x => x.Parent.ID.Equals(parent.ID)))
        //        {
        //            start = start > child.StartDate ? child.StartDate : start;
        //            finish = finish < child.EndDate ? child.EndDate : finish;
        //        }

        //        // Synchronise Parent Start / Finish Dates
        //        if (parent.StartDate != start)
        //            parent.StartDate = start;
        //        if (parent.EndDate != finish)
        //            parent.EndDate = finish;

        //        // Update if necessary
        //        if (parent.IsChanged())
        //        {
        //            new Client<JobStage>().Save(parent, "");
        //            CheckParentDates(parent);
        //        }
        //    }
        //}

        private void NewStage_Click(object sender, RoutedEventArgs e)
        {
            var stage = new JobStage();
            stage.Name = "New Stage";
            stage.Job.ID = JobID;
            stage.StartDate = DateTime.Today;
            stage.EndDate = DateTime.Today;
            DoEdit(stage);
        }

        private void NewTaskClick(object sender, RoutedEventArgs e)
        {
            var task = Gantt.SelectedItems.FirstOrDefault() as GanttTask;
            if (task == null)
            {
                MessageBox.Show("Selected Item is Null!");
                return;
            }

            var parent = _stages.Rows.FirstOrDefault(r => r.Get<JobStage, Guid>(c => c.ID).Equals(task.ID));
            if (parent == null)
            {
                MessageBox.Show("Cannot find Parent!");
                return;
            }

            var stage = new JobStage();
            stage.Name = "New Task";
            stage.Job.ID = JobID;
            stage.Parent.ID = task.ID;
            stage.StartDate = _stages.Rows.Any(r => r.Get<JobStage, Guid>(c => c.Parent.ID).Equals(task.ID)) ? task.FinishDate : task.StartDate;
            stage.EndDate = task.FinishDate;
            DoEdit(stage);
        }

        private void EditStage_Click(object sender, RoutedEventArgs e)
        {
            var task = Gantt.SelectedItems.FirstOrDefault() as GanttTask;
            if (task == null)
            {
                MessageBox.Show("Selected Item is Null!");
                return;
            }

            var stage = _stages.Rows.FirstOrDefault(r => r.Get<JobStage, Guid>(c => c.ID).Equals(task.ID));
            if (stage == null)
            {
                MessageBox.Show("Cannot find Stage!");
                return;
            }

            DoEdit(stage.ToObject<JobStage>());
        }

        private void ImportFile_Click(object sender, RoutedEventArgs e)
        {
            var dlg = new OpenFileDialog();
            dlg.Filter = "Microsoft Project Files (*.mpp)|*.mpp";
            if (dlg.ShowDialog() == true)
            {
                using (new WaitCursor())
                {
                    Progress.Show("Clearing Old Stages (0%)");

                    var dstages = _stages.Rows.Select(x => x.ToObject<JobStage>()).ToArray();
                    new Client<JobStage>().Delete(dstages, "Deleting Due to Import");
                    _stages.Rows.Clear();

                    var drels = _relationships.Rows.Select(x => x.ToObject<JobStageRelationship>()).ToArray();
                    new Client<JobStageRelationship>().Delete(drels, "Deleting Due to Import");
                    _relationships.Rows.Clear();

                    Progress.SetMessage("Loading Project File (20%)");
                    var stages = new List<JobStage>();
                    var relationships = new List<JobStageRelationship>();
                    ProjectReader reader = new UniversalProjectReader();
                    var project = reader.read(dlg.FileName);

                    Progress.SetMessage("Loading Stages (50%)");

                    // Create the raw stages
                    foreach (Task task in project.getTasks())
                    {
                        var stage = new JobStage
                        {
                            Name = task.getName(),
                            StartDate = task.getStart().ToDateTime().Date,
                            EndDate = task.getFinish().ToDateTime().Date,
                            Sequence = task.getID().longValue()
                        };
                        stage.Job.ID = JobID;
                        stages.Add(stage);
                    }

                    if (stages.Any())
                        new Client<JobStage>().Save(stages, "Imported From File");

                    Progress.SetMessage("Building Links (80%)");
                    // Set up the parent links
                    foreach (Task task in project.getTasks())
                    {
                        var stage = stages.FirstOrDefault(x => x.Sequence.Equals(task.getID().longValue()));

                        if (task.getParentTask() != null)
                        {
                            var parent = stages.FirstOrDefault(x => x.Sequence.Equals(task.getParentTask().getID().longValue()));
                            stage.Parent.ID = parent.ID;
                        }

                        stage.IsHeader = task.hasChildTasks();
                        stage.TradesHours = task.getWork().getDuration();
                        if (task.getPredecessors() != null && !task.getPredecessors().isEmpty())
                        {
                            var rels = task.getPredecessors().ToIEnumerable<Relation>().ToArray();
                            foreach (var rel in rels)
                            {
                                var predecessor = stages.FirstOrDefault(x => x.Sequence.Equals(rel.getTargetTask().getID().longValue()));
                                var successor = stages.FirstOrDefault(x => x.Sequence.Equals(rel.getSourceTask().getID().longValue()));
                                if (predecessor != null && successor != null)
                                {
                                    var newrel = new JobStageRelationship();
                                    newrel.Parent.ID = JobID;
                                    newrel.Predecessor.ID = predecessor.ID;
                                    newrel.Successor.ID = successor.ID;
                                    newrel.Type = rel.getType() == RelationType.FINISH_FINISH
                                        ? GanttRelationshipType.FinishToFinish
                                        : rel.getType() == RelationType.FINISH_START
                                            ? GanttRelationshipType.FinishToStart
                                            : rel.getType() == RelationType.START_FINISH
                                                ? GanttRelationshipType.StartToFinish
                                                : GanttRelationshipType.StartToStart;
                                    newrel.Offset = (int)rel.getLag().getDuration();
                                    relationships.Add(newrel);
                                }
                            }
                        }
                    }

                    if (stages.Any(x => x.IsChanged()))
                        new Client<JobStage>().Save(stages.Where(x => x.IsChanged()), "");
                    if (relationships.Any())
                        new Client<JobStageRelationship>().Save(relationships, "Imported from Project File");

                    Progress.Close();
                }

                MessageBox.Show("Project File Imported Successfully!");
                Refresh();
            }
        }

        private void ExportFile_Click(object sender, RoutedEventArgs e)
        {
            var dlg = new SaveFileDialog();
            //dlg.Filter = "Microsoft Project Files (*.mspdi)|*.mspdi;Excel Files (*.xlsx)|*.xlsx";
            dlg.Filter = "Excel Files (*.xlsx)|*.xlsx";
            dlg.FileName = "Project Plan";
            if (dlg.ShowDialog() == true)
            {
                if (dlg.FilterIndex == 0)
                    ExportToExcel(dlg.FileName);
                else if (dlg.FilterIndex == 1)
                    ExportToProject(dlg.FileName);

                else
                    MessageBox.Show(string.Format("Unknown Filter Index: {0}", dlg.FilterIndex));
            }
        }

        private void ExportToProject(string filename)
        {
            MessageBox.Show("Not Yet Implemented");
        }

        private void GetLevel(CoreRow row, ref int level)
        {
            if (row == null || !Entity.IsEntityLinkValid<JobStage, JobStageLink>(x => x.Parent, row))
                return;
            level++;
            GetLevel(_stages.Rows.FirstOrDefault(r => r.Get<JobStage, Guid>(c => c.ID).Equals(row.Get<JobStage, Guid>(c => c.Parent.ID))), ref level);
        }

        private void ExportToExcel(string filename)
        {
            var excelEngine = new ExcelEngine();
            var application = excelEngine.Excel;
            var myWorkbook = excelEngine.Excel.Workbooks.Add();
            myWorkbook.Version = ExcelVersion.Excel2007;
            var mySheet = myWorkbook.Worksheets[0];
            mySheet.Name = "Project Planning";

            var startcol = 1;

            foreach (var row in _stages.Rows)
            {
                var level = 1;
                GetLevel(row, ref level);
                if (level > startcol)
                    startcol = level;
                mySheet.Range[row.Index + 2, level].Value2 = row.Get<JobStage, string>(c => c.Name);
            }

            foreach (var row in _stages.Rows)
            {
                mySheet.Range[row.Index + 2, startcol + 1].Value2 = string.Format("{0:dd/MM/yyyy}", row.Get<JobStage, DateTime>(c => c.StartDate));
                mySheet.Range[row.Index + 2, startcol + 2].Value2 = string.Format("{0:dd/MM/yyyy}", row.Get<JobStage, DateTime>(c => c.EndDate));
            }

            for (var iCol = 1; iCol < startcol; iCol++)
                mySheet.SetColumnWidth(iCol, 2);
            mySheet.SetColumnWidth(startcol, 30);
            mySheet.SetColumnWidth(startcol + 1, 12);
            mySheet.SetColumnWidth(startcol + 2, 12);
            mySheet.Range[1, 1].Text = "Stage Description";
            mySheet.Range[1, startcol + 1].Text = "Start Date";
            mySheet.Range[1, startcol + 2].Text = "Finish Date";

            foreach (var row in mySheet.UsedRange.Rows)
            {
                row.RowHeight += 5;
                row.VerticalAlignment = ExcelVAlign.VAlignCenter;
            }

            try
            {
                myWorkbook.SaveAs(filename, ExcelSaveType.SaveAsXLS);
                Process.Start(new ProcessStartInfo(filename) { UseShellExecute = true });
            }
            catch (Exception e2)
            {
                MessageBox.Show("Error saving spreadsheet!\n\n" + e2.Message);
            }
        }


        private void Task_PropertyChanged(object sender, PropertyChangedEventArgs args)
        {
            if (!IsReady)
                return;

            if (!string.Equals(args.PropertyName, "StartDate") && !string.Equals(args.PropertyName, "FinishDate"))
                return;

            var task = sender as GanttTask;
            if (task == null)
                return;

            var row = _stages.Rows.FirstOrDefault(r => r.Get<JobStage, Guid>(x => x.ID) == task.ID);
            if (row == null)
                return;

            var stage = row?.ToObject<JobStage>();

            var bChanged = false;

            if (string.Equals(args.PropertyName, "FinishDate"))
            {
                stage.EndDate = task.FinishDate.Date;
                bChanged = true;
            }
            else if (string.Equals(args.PropertyName, "StartDate"))
            {
                stage.StartDate = task.StartDate.Date;
                bChanged = true;
            }

            if (bChanged)
            {
                row.Set<JobStage, DateTime>(x => x.EndDate, stage.EndDate.Date);
                row.Set<JobStage, DateTime>(x => x.StartDate, stage.StartDate.Date);
                new Client<JobStage>().Save(stage, "Updated by Planner", (o, e) => { });
            }
        }

        private void Gantt_RelationshipEstablished(object sender, GanttRelationshipEstablishedEventArgs args)
        {
            var pred = args.StartTask as GanttTask;
            var succ = args.EndTask as GanttTask;
            if (pred == null || pred.IsMileStone)
                throw new Exception("Cannot make a connection here");
            if (succ == null || succ.IsMileStone)
                throw new Exception("Cannot make a connection here");
            var relationship = new JobStageRelationship();
            relationship.Parent.ID = JobID;
            relationship.Predecessor.ID = pred.ID;
            relationship.Successor.ID = succ.ID;
            relationship.Type = args.Relationship == GanttTaskRelationship.FinishToFinish
                ? GanttRelationshipType.FinishToFinish
                : args.Relationship == GanttTaskRelationship.FinishToStart
                    ? GanttRelationshipType.FinishToStart
                    : args.Relationship == GanttTaskRelationship.StartToFinish
                        ? GanttRelationshipType.StartToFinish
                        : GanttRelationshipType.StartToStart;
            new Client<JobStageRelationship>().Save(relationship, "", (o, e) =>
            {
                var row = _relationships.NewRow();
                _relationships.LoadRow(row, relationship);
                _relationships.Rows.Add(row);
            });
        }

        private void GanttContextMenu_Opened(object sender, RoutedEventArgs e)
        {
            var task = Gantt.SelectedItems.FirstOrDefault() as GanttTask;
            UnlinkTaskMenu.IsEnabled = task != null && task.Predecessor.Any();
            UnlinkTaskMenu.Tag = task;
        }


        private void UnlinkTaskMenu_Click(object sender, RoutedEventArgs e)
        {
            var successor = (sender as MenuItem).Tag as GanttTask;
            if (successor == null)
                return;
            var deletes = new List<JobStageRelationship>();
            foreach (var link in successor.Predecessor)
            {
                var predecessor = _tasks.FirstOrDefault(x => x.TaskId == link.GanttTaskIndex);
                if (predecessor != null)
                {
                    var rows = _relationships.Rows.Where(r =>
                        r.Get<KanbanRelationship, Guid>(c => c.Successor.ID).Equals(successor.ID) &&
                        r.Get<KanbanRelationship, Guid>(c => c.Predecessor.ID).Equals(predecessor.ID)).ToArray();
                    foreach (var row in rows)
                    {
                        deletes.Add(row.ToObject<JobStageRelationship>());
                        _relationships.Rows.Remove(row);
                    }
                }
            }

            if (deletes.Any())
                new Client<JobStageRelationship>().Delete(deletes, "", (o, args) => { });
            successor.Predecessor.Clear();
        }

        private void GanttGrid_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            var task = Gantt.SelectedItems.FirstOrDefault() as GanttTask;
            if (task == null)
                return;
            var row = _stages.Rows.FirstOrDefault(r => r.Get<Kanban, Guid>(x => x.ID) == task.ID);
            var stage = row?.ToObject<JobStage>();
            if (stage != null)
                DoEdit(stage);
        }

        private void EditTask_Click(object sender, RoutedEventArgs e)
        {
            var task = Gantt.SelectedItems.FirstOrDefault() as GanttTask;
            if (task == null)
                return;
            var row = _stages.Rows.FirstOrDefault(r => r.Get<Kanban, Guid>(x => x.ID) == task.ID);
            var stage = row?.ToObject<JobStage>();
            if (stage != null)
                DoEdit(stage);
        }
    }
}