using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Wpf;
using InABox.WPF;
using Syncfusion.Data;
using Syncfusion.UI.Xaml.Grid;
using Syncfusion.Windows.Shared;
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;

namespace PRSDesktop;

public class JobRequisitionItemSelectionItem : BaseObject
{
    public double Quantity { get; set; }

    private double _issued;
    public double Issued
    {
        get => _issued;
        set
        {
            var oldValue = _issued;
            var canMinus = CanMinus;
            var canPlus = CanPlus;

            _issued = value;
            if(oldValue != value)
            {
                OnPropertyChanged(nameof(Issued), oldValue, value);
            }
            if(canMinus != CanMinus)
            {
                OnPropertyChanged(nameof(CanMinus), canMinus, CanMinus);
            }
            if(canPlus != CanPlus)
            {
                OnPropertyChanged(nameof(CanPlus), canPlus, CanPlus);
            }
        }
    }

    public double MaxValue { get; set; }

    private bool _editable = true;
    public bool Editable
    {
        get => _editable;
        set
        {
            var oldValue = _editable;
            var canMinus = CanMinus;
            var canPlus = CanPlus;

            _editable = value;
            if(oldValue != value)
            {
                OnPropertyChanged(nameof(Editable), oldValue, value);
            }
            if(canMinus != CanMinus)
            {
                OnPropertyChanged(nameof(CanMinus), canMinus, CanMinus);
            }
            if(canPlus != CanPlus)
            {
                OnPropertyChanged(nameof(CanPlus), canPlus, CanPlus);
            }
        }
    }

    public bool CanMinus => Editable && Issued > 0;

    public bool CanPlus => Editable && Issued < MaxValue;

    public JobRequisitionItem JRI { get; set; }
}

public abstract class JobRequisitionItemSelectionGrid<T> : DynamicItemsListGrid<T>, INotifyPropertyChanged
    where T : JobRequisitionItemSelectionItem, new()
{
    private double _totalQuantity;
    public double TotalQuantity
    {
        get => _totalQuantity;
        set
        {
            _totalQuantity = value;
            OnPropertyChanged();
        }
    }

    private double _totalIssued;
    public double TotalIssued
    {
        get => _totalIssued;
        set
        {
            _totalIssued = value;
            OnPropertyChanged();
        }
    }

    private bool _observing = true;
    public void SetObserving(bool observing)
    {
        if(_observing != observing)
        {
            _observing = observing;
            if (_observing)
            {
                Recalculate();
            }
        }
    }

    protected override void Init()
    {
        base.Init();

        ActionColumns.Add(new DynamicTemplateColumn(TotalColumn_Template)
        {
            HeaderText = "Total",
            Width = 60,
            GetSummary = () =>
            {
                var summary = new GridSummaryColumn
                {
                    TemplateSelector = new FuncTemplateSelector((item, o) => TotalQuantity_Template())
                };
                return summary;
            }
        });
        ActionColumns.Add(new DynamicTemplateColumn(QuantityColumn_Template)
        {
            HeaderText = "Quantity",
            Width = 230,
            GetSummary = () =>
            {
                var summary = new GridSummaryColumn
                {
                    TemplateSelector = new FuncTemplateSelector((item, o) => TotalIssued_Template())
                };
                return summary;
            }
        });
    }

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

    private FrameworkElement TotalQuantity_Template()
    {
        var quantity = new DoubleTextBox
        {
            HorizontalContentAlignment = HorizontalAlignment.Center,
            VerticalContentAlignment = VerticalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Stretch,
            HorizontalAlignment = HorizontalAlignment.Stretch,
            Background = new SolidColorBrush(Colors.WhiteSmoke),
            IsReadOnly = true,
            Margin = new Thickness(0, 5, 0, 5)
        };
        quantity.Bind(DoubleTextBox.ValueProperty, this, x => x.TotalQuantity);
        return quantity;
    }

    private FrameworkElement TotalIssued_Template()
    {
        var quantity = new DoubleTextBox
        {
            HorizontalContentAlignment = HorizontalAlignment.Center,
            VerticalContentAlignment = VerticalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Stretch,
            HorizontalAlignment = HorizontalAlignment.Stretch,
            Background = new SolidColorBrush(Colors.LightGreen),
            IsReadOnly = true,
            Margin = new Thickness(50 + 30 + 10, 5, 50 + 30 + 5, 5)
        };
        quantity.Bind(DoubleTextBox.ValueProperty, this, x => x.TotalIssued);
        return quantity;
    }

    private class TotalAggregate : ISummaryAggregate
    {
        public double Sum { get; private set; }

        private JobRequisitionItemSelectionGrid<T> Grid;

        public enum TotalColumn
        {
            Quantity,
            Issued
        }

        public TotalColumn Type { get; set; }

        public TotalAggregate(TotalColumn type, JobRequisitionItemSelectionGrid<T> grid)
        {
            Type = type;
            Grid = grid;
        }

        public Action<IEnumerable, string, PropertyDescriptor> CalculateAggregateFunc()
        {
            return AggregateFunc;
        }

        private void AggregateFunc(IEnumerable items, string property, PropertyDescriptor args)
        {
            if (items is IEnumerable<DataRowView> rows)
            {
                Sum = Type switch
                {
                    TotalColumn.Quantity => Grid.TotalQuantity,
                    TotalColumn.Issued or _ => Grid.TotalIssued
                };
            }
            else
            {
                Logger.Send(LogType.Error, "", $"Attempting to calculate aggregate on invalid data type '{items.GetType()}'.");
            }
        }
    }

    protected class UIComponent : DynamicGridGridUIComponent<T>
    {
        public UIComponent(JobRequisitionItemSelectionGrid<T> grid)
        {
            Parent = grid;

            GridLines = DynamicGridLines.None;
            RowHeight = 40;
            HeaderRowHeight = 40;
        }

        protected override Brush? GetCellSelectionBackgroundBrush()
        {
            return null;
        }
        protected override Brush? GetCellSelectionForegroundBrush()
        {
            return null;
        }

        protected override Brush? GetCellBackground(CoreRow row, DynamicColumnBase column)
        {
            return base.GetCellBackground(row, column);
        }

        protected override Style GetHeaderCellStyle(DynamicColumnBase column)
        {
            var style = base.GetHeaderCellStyle(column);
            style.Setters.Add(new Setter(Control.BackgroundProperty, new SolidColorBrush(Colors.Silver)));
            style.Setters.Add(new Setter(Control.FontWeightProperty, FontWeights.Bold));
            style.Setters.Add(new Setter(Control.BorderThicknessProperty, new Thickness(0.0)));
            style.Setters.Add(new Setter(Control.MarginProperty, new Thickness(0.0)));
            return style;
        }

        protected override Style GetSummaryRowStyle()
        {
            var style = base.GetSummaryRowStyle();
            style.Setters.Add(new Setter(Control.BorderBrushProperty, new SolidColorBrush(Colors.Silver)));
            style.Setters.Add(new Setter(Control.BorderThicknessProperty, new Thickness(1, 1, 0, 1)));
            style.Setters.Add(new Setter(Control.MarginProperty, new Thickness(0, 1, 0, 0)));
            style.Setters.Add(new Setter(Control.BackgroundProperty, new SolidColorBrush(Colors.WhiteSmoke)));
            return style;
        }

        protected override Style GetSummaryCellStyle(DynamicColumnBase column)
        {
            var style = base.GetSummaryCellStyle(column);

            style.Setters.Add(new Setter(Control.BorderThicknessProperty, new Thickness(0)));
            style.Setters.Add(new Setter(Control.BackgroundProperty, new SolidColorBrush(Colors.Transparent)));
            style.Setters.Add(new Setter(GridTableSummaryCell.HorizontalContentAlignmentProperty, HorizontalAlignment.Stretch));
            style.Setters.Add(new Setter(Control.VerticalContentAlignmentProperty, VerticalAlignment.Stretch));
            style.Setters.Add(new Setter(Control.PaddingProperty, new Thickness(0)));

            return style;
        }
    }

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

    private FrameworkElement? TotalColumn_Template(CoreRow row)
    {
        var item = LoadItem(row);

        var quantity = new DoubleTextBox
        {
            HorizontalContentAlignment = HorizontalAlignment.Center,
            VerticalContentAlignment = VerticalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Stretch,
            Background = new SolidColorBrush(Colors.WhiteSmoke),
            IsReadOnly = true,
            Margin = new Thickness(0, 5, 0, 5)
        };
        quantity.Bind(DoubleTextBox.ValueProperty, item, x => x.Quantity);
        quantity.Bind(Button.IsEnabledProperty, item, x => x.Editable);

        return quantity;
    }

    private FrameworkElement? QuantityColumn_Template(CoreRow row)
    {
        var item = LoadItem(row);

        var grid = new Grid();
        grid.Margin = new Thickness(5);
        grid.AddColumn(50);
        grid.AddColumn(30);
        grid.AddColumn(60);
        grid.AddColumn(30);
        grid.AddColumn(50);

        var none = new Button
        {
            Content = "None",
        };
        none.Bind(Button.IsEnabledProperty, item, x => x.Editable);
        none.Margin = new Thickness(0);
        none.Click += (o, e) => None_Click(item);
        grid.AddChild(none, 0, 0);

        var minus = new Button
        {
            Content = "-",
        };
        minus.Bind(Button.IsEnabledProperty, item, x => x.CanMinus);
        minus.Margin = new Thickness(5, 0, 0, 0);
        minus.Click += (o, e) => Minus_Click(item);
        grid.AddChild(minus, 0, 1);

        var quantity = new DoubleTextBox
        {
            HorizontalContentAlignment = HorizontalAlignment.Center,
            VerticalContentAlignment = VerticalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Stretch,
            Margin = new Thickness(5, 0, 0, 0)
        };

        var style = new Style(typeof(DoubleTextBox));
        style.AddSetter(BackgroundProperty, Colors.LightYellow.ToBrush());
        style.AddDataTrigger()
            .Bind(item, x => x.Issued, true, new FuncConverter<double, bool>(issued => issued > item.Quantity && issued > 0))
            .AddSetter(BackgroundProperty, Colors.Salmon.ToBrush());
        quantity.Style = style;

        quantity.Bind(DoubleTextBox.ValueProperty, item, x => x.Issued);
        quantity.MinValue = 0;
        quantity.Bind(DoubleTextBox.MaxValueProperty, item, x => x.MaxValue);
        quantity.Bind(Button.IsEnabledProperty, item, x => x.Editable);
        grid.AddChild(quantity, 0, 2);

        var plus = new Button
        {
            Content = "+",
        };
        plus.Bind(Button.IsEnabledProperty, item, x => x.CanPlus);
        plus.Margin = new Thickness(5, 0, 0, 0);
        plus.Click += (o, e) => Plus_Click(item);
        grid.AddChild(plus, 0, 3);

        var all = new Button
        {
            Content = "All",
        };
        all.Bind(Button.IsEnabledProperty, item, x => x.Editable);
        all.Margin = new Thickness(5, 0, 0, 0);
        all.Click += (o, e) => All_Click(item);
        grid.AddChild(all, 0, 4);

        return grid;
    }

    private void None_Click(T item)
    {
        item.Issued = 0;
    }

    private void Minus_Click(T item)
    {
        item.Issued = Math.Max(0, item.Issued - 1);
    }

    private void Plus_Click(T item)
    {
        item.Issued = Math.Min(item.Issued + 1, item.MaxValue);
    }

    private void All_Click(T item)
    {
        item.Issued = Math.Max(0, item.Quantity);
    }

    protected override void Reload(Filters<T> criteria, Columns<T> columns, ref SortOrder<T>? sort, Action<CoreTable?, Exception?> action)
    {
        foreach(var item in Items)
        {
            item.PropertyChanged += (o, e) => Recalculate();
        }
        Recalculate();

        base.Reload(criteria, columns, ref sort, action);
    }

    public Dictionary<Guid, double> GetQuantities()
    {
        return Items.ToDictionary(x => x.JRI.ID, x => x.Issued);
    }
    private void Recalculate()
    {
        if (!_observing) return;

        TotalQuantity = Items.Sum(x => x.Quantity);
        TotalIssued = Items.Sum(x => x.Issued);
    }

    public event PropertyChangedEventHandler? PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}