using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Media;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.WPF;
using Syncfusion.UI.Xaml.Diagram;
using Syncfusion.UI.Xaml.Diagram.Layout;
using Color = System.Drawing.Color;

namespace PRSDesktop
{
    public class OrgChartDataModel : DiagramViewModel
    {
        private OrgChartAppearance _appearance = OrgChartAppearance.Vertical;

        private OrgChartLayout _layout = OrgChartLayout.Employee;


        public OrgChartDataModel()
        {
            Active = false;

            Menu = null;
            Tool = Tool.ZoomPan;

            DataSourceSettings = new DataSourceSettings
            {
                ParentId = "ParentID",
                Id = "ID"
            };

            LayoutManager = new LayoutManager { RefreshFrequency = RefreshFrequency.Reset };
            Data = new OrgChartEntries();
            DataSourceSettings.DataSource = new ObservableCollection<OrgChartEntry>();
        }

        public bool Active { get; set; }

        public OrgChartAppearance Appearance
        {
            get => _appearance;
            set
            {
                if (_appearance != value)
                {
                    _appearance = value;
                    if (Active)
                        Refresh();
                }
            }
        }

        public OrgChartLayout Layout
        {
            get => _layout;
            set
            {
                if (_layout != value)
                {
                    _layout = value;
                    if (Active)
                        UpdateLayout();
                }
            }
        }

        public OrgChartEntries Data { get; }

        public void UpdateLayout()
        {
            switch (_appearance)
            {
                case OrgChartAppearance.Vertical:
                    LayoutManager.Layout = new DirectedTreeLayout
                    {
                        Type = LayoutType.Organization,
                        HorizontalSpacing = 40,
                        VerticalSpacing = 50,
                        AvoidSegmentOverlapping = false
                    };
                    DefaultConnectorType = ConnectorType.Orthogonal;
                    break;

                case OrgChartAppearance.Horizontal:
                    LayoutManager.Layout = new DirectedTreeLayout
                    {
                        Type = LayoutType.Hierarchical,
                        HorizontalSpacing = 40,
                        VerticalSpacing = 50,
                        AvoidSegmentOverlapping = false
                    };
                    DefaultConnectorType = ConnectorType.Orthogonal;
                    break;

                case OrgChartAppearance.Radial:
                    LayoutManager.Layout = new RadialTreeLayout
                    {
                        HorizontalSpacing = 40,
                        VerticalSpacing = 50,
                        Bounds = new Rect(0, 0, 1000, 1000)
                    };
                    DefaultConnectorType = ConnectorType.Line;
                    break;
            }
        }

        private void GetThumbnails(OrgChartEntries entries)
        {
            var thumbids = entries.Select(x => x.ImageID).Where(x => x != Guid.Empty).Distinct().ToArray();
            if (thumbids.Any())
            {
                var thumbs = new Client<Document>().Query(
                    new Filter<Document>(x => x.ID).InList(thumbids),
                    new Columns<Document>(
                        x => x.ID,
                        x => x.Data
                    )
                );

                foreach (var row in thumbs.Rows)
                {
                    var entry = entries.FirstOrDefault(x => x.ImageID == row.Get<Document, Guid>(c => c.ID));
                    if (entry != null)
                    {
                        var data = row.Get<Document, byte[]>(c => c.Data);
                        var image = ImageUtils.LoadImage(data);
                        entry.Image = new ImageBrush(image);
                    }
                }
            }
        }

        public void Refresh()
        {
            var query = new MultiQuery();

            query.Add<EmployeePosition>();

            query.Add<Role>();
            query.Add<EmployeeRole>();

            query.Add(
                LookupFactory.DefineFilter<Employee>(),
                new Columns<Employee>(
                    x => x.ID,
                    x => x.Name,
                    x => x.Position.ID,
                    x => x.Position.Description,
                    x => x.OrgChart.ReportsTo.ID,
                    x => x.OrgChart.Color,
                    x => x.OrgChart.Visible,
                    x => x.Thumbnail.ID
                )
            );
            query.Query();

            var employees = query.Get<Employee>();

            Data.Clear();

            if (_layout == OrgChartLayout.Employee)
            {
                foreach (var row in employees.Rows)
                {
                    var entry = new OrgChartEntry
                    {
                        ID = row.Get<Employee, Guid>(x => x.ID),
                        ParentID = row.Get<Employee, Guid>(x => x.OrgChart.ReportsTo.ID),

                        Name = row.Get<Employee, string>(x => x.Name),
                        Position = row.Get<Employee, string>(x => x.Position.Description),
                        ImageID = row.Get<Employee, Guid>(x => x.Thumbnail.ID),
                        Color = row.Get<Employee, string>(x => x.OrgChart.Color),
                        Visible = row.Get<Employee, bool>(x => x.OrgChart.Visible)
                    };
                    Data.Add(entry);
                }
            }
            else if (_layout == OrgChartLayout.Position)
            {
                var positions = query.Get<EmployeePosition>();
                foreach (var row in positions.Rows)
                {
                    var entry = new OrgChartEntry
                    {
                        ID = row.Get<EmployeePosition, Guid>(x => x.ID),
                        ParentID = row.Get<EmployeePosition, Guid>(x => x.OrgChart.ReportsTo.ID),

                        Position = row.Get<EmployeePosition, string>(x => x.Description),
                        ImageID = Guid.Empty,
                        Color = row.Get<EmployeePosition, string>(x => x.OrgChart.Color),
                        Visible = row.Get<Employee, bool>(x => x.OrgChart.Visible)
                    };

                    entry.Name = string.Join("\n",
                        employees.Rows
                            .Where(r => r.Get<Employee, Guid>(c => c.Position.ID) == entry.ID)
                            .Select(r => r.Get<Employee, string>(c => c.Name))
                            .OrderBy(x => x)
                    );
                    if (string.IsNullOrWhiteSpace(entry.Name))
                    {
                        entry.WarningColor = ImageUtils.ColorToString(Color.Red);
                        entry.Name = "VACANT";
                    }

                    Data.Add(entry);
                }
            }
            else if (_layout == OrgChartLayout.Role)
            {
                var roles = query.Get<Role>();
                var emproles = query.Get<EmployeeRole>();
                foreach (var row in roles.Rows)
                {
                    var id = row.Get<Role, Guid>(x => x.ID);
                    var parentid = row.Get<Role, Guid>(x => x.OrgChart.ReportsTo.ID);
                    var entry = new OrgChartEntry
                    {
                        ID = row.Get<Role, Guid>(x => x.ID),
                        ParentID = row.Get<Role, Guid>(x => x.OrgChart.ReportsTo.ID),

                        Position = row.Get<Role, string>(x => x.Name),
                        ImageID = Guid.Empty,
                        Color = row.Get<Role, string>(x => x.OrgChart.Color),
                        Visible = row.Get<Employee, bool>(x => x.OrgChart.Visible)
                    };

                    entry.Name = string.Join("\n",
                        emproles.Rows
                            .Where(
                                r => r.Get<EmployeeRole, Guid>(c => c.RoleLink.ID) == entry.ID
                            )
                            .Select(r => r.Get<EmployeeRole, string>(c => c.EmployeeLink.Name))
                            .OrderBy(x => x)
                    );
                    if (string.IsNullOrWhiteSpace(entry.Name))
                    {
                        entry.WarningColor = ImageUtils.ColorToString(Color.Red);
                        entry.Name = "VACANT";
                    }

                    Data.Add(entry);
                }
            }

            GetThumbnails(Data);

            UpdateLayout();
            var source = DataSourceSettings.DataSource as ObservableCollection<OrgChartEntry>;
            source.Clear();
            foreach (var entry in Data.Where(x => x.Visible))
                source.Add(entry);
            //= Data.Where(x=>x.Visible).ToList();
        }


        public event PropertyChangedEventHandler PropertyChanged;

        private void onPropertyChanged(string name)
        {
            if (PropertyChanged != null) PropertyChanged.Invoke(this, new PropertyChangedEventArgs(name));
        }
    }
}