using System;
using System.Linq;
using System.Linq.Expressions;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using Comal.Classes;
using InABox.Core;
using InABox.DynamicGrid;
using Syncfusion.Windows.Shared;

namespace PRSDesktop
{
    public class EmployeeRosterGrid : DynamicOneToManyGrid<Employee, EmployeeRoster>
    {
        private readonly UpDown _length;
        private readonly DatePicker _start;

        private readonly DynamicGridStyle off = new NewDynamicGridStyle
        {
            Background = new SolidColorBrush(Colors.LightYellow),
            Foreground = new SolidColorBrush(Colors.Black)
        };

        private readonly DynamicGridStyle on = new NewDynamicGridStyle
        {
            Background = new SolidColorBrush(Colors.LightGreen),
            Foreground = new SolidColorBrush(Colors.Black)
        };

        public EmployeeRosterGrid()
        {
            Options.AddRange(DynamicGridOption.DirectEdit);

            var lblLength = new Label
            {
                Content = "Roster Length",
                VerticalContentAlignment = VerticalAlignment.Center
            };
            lblLength.SetValue(DockPanel.DockProperty, Dock.Left);

            _length = new UpDown
            {
                Width = 50.0F,
                VerticalContentAlignment = VerticalAlignment.Center,
                HorizontalContentAlignment = HorizontalAlignment.Center,
                NumberDecimalDigits = 0,
                TextAlignment = TextAlignment.Center,
                MinValue = 0,
                AllowEdit = false
            };
            _length.SetValue(DockPanel.DockProperty, Dock.Left);

            _start = new DatePicker
            {
                Width = 100.0F,
                VerticalContentAlignment = VerticalAlignment.Center,
                HorizontalContentAlignment = HorizontalAlignment.Center
            };
            _start.SetValue(DockPanel.DockProperty, Dock.Right);

            var lblStart = new Label
            {
                Content = "Start Date",
                VerticalContentAlignment = VerticalAlignment.Center
            };
            lblStart.SetValue(DockPanel.DockProperty, Dock.Right);

            var lblPadding = new Label
            {
                Content = "",
                VerticalContentAlignment = VerticalAlignment.Center
            };
            lblPadding.SetValue(DockPanel.DockProperty, Dock.Left);

            var dock = new DockPanel();
            dock.Children.Add(lblLength);
            dock.Children.Add(_length);
            dock.Children.Add(_start);
            dock.Children.Add(lblStart);
            dock.Children.Add(lblPadding);

            var border = new Border
            {
                //BorderBrush = new SolidColorBrush(Colors.Gray),
                BorderThickness = new Thickness(0),
                //CornerRadius = new System.Windows.CornerRadius(5,5,0,0),
                //Margin = new System.Windows.Thickness(0, 0, 0, 2),
                Padding = new Thickness(0, 5, 0, 5),
                Child = dock
            };

            Header = border;
        }

        public override void Load(object item, Func<Type, CoreTable> PageDataHandler)
        {
            base.Load(item, PageDataHandler);

            _length.Value = (item as Employee).RosterLength;
            _length.ValueChanged += Length_ValueChanged;

            _start.SelectedDate = (item as Employee).RosterStart;
            _start.SelectedDateChanged += Start_SelectedDateChanged;
        }

        private void Length_ValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            Item.RosterLength = (int)Math.Truncate((double)e.NewValue);
            ReconfigureRoster();
        }

        private void ReconfigureRoster()
        {
            var count = (int)_length.Value.Value;
            var start = _start.SelectedDate.Value;
            while (Items.Count < count)
                Items.Add(new EmployeeRoster { Day = Items.Count + 1 });
            while (Items.Count > count)
                Items.RemoveAt(Items.Count - 1);
            for (var i = 0; i < count; i++)
                Items[i].Description = Items.Count % 7 == 0
                    ? start.AddDays(i).DayOfWeek.ToString()
                    : string.Format("Day {0}", i + 1);
            Refresh(false, true);
        }

        private void Start_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
        {
            Item.RosterStart = _start.SelectedDate.Value;
            ReconfigureRoster();
        }

        protected override DynamicGridStyle GetStyle(CoreRow row, DynamicGridStyle style)
        {
            Expression<Func<EmployeeRoster, TimeSpan>>[] times =
            {
                x => x.Start,
                x => x.Finish,
                x => x.Break,
                x => x.Start2,
                x => x.Finish2,
                x => x.Break2
            };

            var sel = times.Any(x => row.Get(x).Ticks != 0L) ? on : off;
            return base.GetStyle(row, sel);
        }


        public override void ConfigureColumns(DynamicGridColumns columns)
        {
            var col = columns.FirstOrDefault(x => string.Equals(x.ColumnName, "UsualActivity.ID"));
            if (col != null)
                (col.Editor as ComboLookupEditor).OnBeforeGenerateLookups += (generator, entries) =>
                {
                    (generator as LookupGenerator<Employee>).Items = new[] { Item };
                };

            SetVisibility<AllowEmployeeRosterSplitShifts>(columns.FirstOrDefault(x => string.Equals(x.ColumnName, "SplitShift")));
            SetVisibility<AllowEmployeeRosterSplitShifts>(columns.FirstOrDefault(x => string.Equals(x.ColumnName, "Start2")));
            SetVisibility<AllowEmployeeRosterSplitShifts>(columns.FirstOrDefault(x => string.Equals(x.ColumnName, "Finish2")));
            SetVisibility<AllowEmployeeRosterSplitShifts>(columns.FirstOrDefault(x => string.Equals(x.ColumnName, "Break2")));

            base.ConfigureColumns(columns);
        }

        private void SetVisibility<T>(DynamicGridColumn column) where T : ISecurityDescriptor, new()
        {
            if (column?.Editor == null)
                return;
            column.Editor.Visible = Security.IsAllowed<T>() ? Visible.Default : Visible.Hidden;
        }
    }
}