using System;
using System.Data;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
using InABox.Clients;
using InABox.Core;
using InABox.Scripting;
using Syncfusion.UI.Xaml.Grid;

namespace InABox.DynamicGrid
{
    public delegate DynamicGridStyle OnGetDynamicGridRowStyle(CoreRow row, DynamicGridStyle defaultstyle);
    
    public interface IBaseDynamicGridStyle
    {
        double FontSize { get; set; }
        FontStyle FontStyle { get; set; }
        FontWeight FontWeight { get; set; }
        Brush Background { get; set; }
        Brush Foreground { get; set; }
    }

    public interface IDynamicGridStyle : IBaseDynamicGridStyle
    {
        DependencyProperty FontSizeProperty { get; }
        DependencyProperty FontStyleProperty { get; }
        DependencyProperty FontWeightProperty { get; }
        DependencyProperty BackgroundProperty { get; }
        DependencyProperty ForegroundProperty { get; }
    }

    public abstract class DynamicGridStyle : Style, IDynamicGridStyle
    {
        public DynamicGridStyle(Type T) : base(T)
        {
            FontSize = 12D;
            FontWeight = FontWeights.Normal;
            FontStyle = FontStyles.Normal;
            Background = new SolidColorBrush(Colors.White);
            Foreground = new SolidColorBrush(Colors.Black);
        }

        public DynamicGridStyle(DynamicGridStyle source) : base(source.TargetType, source)
        {
            FontSize = source.FontSize;
            FontWeight = source.FontWeight;
            FontStyle = source.FontStyle;
            Background = source.Background;
            Foreground = source.Foreground;
        }

        public abstract DependencyProperty FontSizeProperty { get; }

        public abstract DependencyProperty FontStyleProperty { get; }

        public abstract DependencyProperty FontWeightProperty { get; }

        public abstract DependencyProperty BackgroundProperty { get; }

        public abstract DependencyProperty ForegroundProperty { get; }

        public double FontSize
        {
            get => Get<double>(FontSizeProperty, 8);
            set => Set(FontSizeProperty, value);
        }

        public FontStyle FontStyle
        {
            get => Get(FontStyleProperty, FontStyles.Italic);
            set => Set(FontStyleProperty, value);
        }

        public FontWeight FontWeight
        {
            get => Get(FontWeightProperty, FontWeights.DemiBold);
            set => Set(FontWeightProperty, value);
        }

        public Brush Background
        {
            get => Get<Brush>(BackgroundProperty, new SolidColorBrush(Colors.Yellow));
            set => Set(BackgroundProperty, value);
        }


        public Brush Foreground
        {
            get => Get<Brush>(ForegroundProperty, new SolidColorBrush(Colors.Green));
            set => Set(ForegroundProperty, value);
        }

        private void Set<T>(DependencyProperty property, T value)
        {
            var setter = Setters.FirstOrDefault(x => x is Setter && ((Setter)x).Property.Equals(property)) as Setter;
            if (setter == null)
            {
                Setters.Add(new Setter(property, value));
            }
            else
            {
                if (!setter.IsSealed)
                    setter.Value = value;
            }
        }

        private T Get<T>(DependencyProperty property, T defaultvalue)
        {
            var setter = Setters.FirstOrDefault(x => x is Setter && ((Setter)x).Property.Equals(property)) as Setter;
            return setter != null ? (T)setter.Value : defaultvalue;
        }
    }

    public abstract class DynamicGridStyle<T> : DynamicGridStyle
    {
        public DynamicGridStyle(IDynamicGridStyle? source) : base(typeof(T))
        {
            if (source != null)
            {
                FontSize = source.FontSize;
                FontStyle = source.FontStyle;
                FontWeight = source.FontWeight;
                Background = source.Background;
                Foreground = source.Foreground;
            }
        }
    }

    public abstract class DynamicGridRowStyleSelector<T> : StyleSelector, IBaseDynamicGridStyle
    {
        private static bool initialized;

        private static ScriptDocument? helper;

        private static DynamicGridStyle defaultstyle;

        public CoreTable Data { get; set; }
        
        public double FontSize
        {
            get => defaultstyle.FontSize;
            set => defaultstyle.FontSize = value;
        }

        public FontStyle FontStyle
        {
            get => defaultstyle.FontStyle;
            set => defaultstyle.FontStyle = value;
        }

        public FontWeight FontWeight
        {
            get => defaultstyle.FontWeight;
            set => defaultstyle.FontWeight = value;
        }

        public Brush Background
        {
            get => defaultstyle.Background;
            set => defaultstyle.Background = value;
        }

        public Brush Foreground
        {
            get => defaultstyle.Foreground;
            set => defaultstyle.Foreground = value;
        }

        protected abstract DynamicGridStyle CreateStyle();

        private CoreRow? GetRow(object item)
        {
            try
            {
                var row = (item as DataRowBase)?.RowData as DataRowView;
                if (row != null)
                {
                    var index = row.Row.Table.Rows.IndexOf(row.Row);
                    return Data.Rows[index];
                }

                return null;
            }
            catch
            {
                return null;
            }
        }


        private void Initialize()
        {
            if (initialized)
                return;

            defaultstyle = CreateStyle();

            var stylescript = ClientFactory.ClientType == null
                ? null
                : new Client<Script>()
                    .Load(new Filter<Script>(x => x.Section).IsEqualTo(typeof(T).EntityName()).And(x => x.ScriptType).IsEqualTo(ScriptType.RowStyle))
                    .FirstOrDefault();
            if (stylescript != null)
            {
                helper = new ScriptDocument(stylescript.Code);
                if (!helper.Compile())
                    helper = null;
            }

            initialized = true;
        }

        public event OnGetDynamicGridRowStyle? GetStyle;

        private DynamicGridStyle ExecuteHelper(CoreRow row, DynamicGridStyle style)
        {
            var result = style;

            try
            {
                if(helper is null)
                {
                    throw new Exception("Helper is null");
                }
                helper.SetValue("Row", row);
                helper.SetValue("Background", style.Background);
                helper.SetValue("Foreground", style.Foreground);
                helper.SetValue("Style", style.FontStyle);
                helper.SetValue("Weight", style.FontWeight);
                helper.SetValue("Size", style.FontSize);

                if (helper.Execute())
                {
                    result = CreateStyle();
                    result.Background = (Brush)helper.GetValue("Background");
                    result.Foreground = (Brush)helper.GetValue("Foreground");
                    result.FontStyle = (FontStyle)helper.GetValue("Style");
                    result.FontWeight = (FontWeight)helper.GetValue("Weight");
                    result.FontSize = (double)helper.GetValue("Size");
                }
            }
            catch (Exception e)
            {
                Logger.Send(LogType.Information, "", "Unable to Invoke Row Style Helper: " + e.Message);
            }

            return result;
        }

        public override Style SelectStyle(object item, DependencyObject container)
        {
            Initialize();

            if (Data == null)
                return defaultstyle;

            if (item == null)
                return defaultstyle;

            var row = GetRow(item);

            if (row == null)
                return defaultstyle;

            var style = GetStyle != null ? GetStyle(row, defaultstyle) : defaultstyle;

            if (helper != null)
                return ExecuteHelper(row, style);

            return style;
        }
    }

    public class DynamicGridRowStyleSelector<TEntity, TStyle> : DynamicGridRowStyleSelector<TEntity> where TStyle : DynamicGridStyle, new()
    {
        protected override DynamicGridStyle CreateStyle()
        {
            return new TStyle();
        }
    }

    public class DynamicGridCellStyleConverter<T> : IValueConverter
    {

        private IDynamicGrid _grid;
        
        private Func<CoreRow, String, T> _converter;
        
        public DynamicGridCellStyleConverter(IDynamicGrid grid, Func<CoreRow, String, T> converter)
        {
            _grid = grid ?? throw new ArgumentNullException(nameof(grid));
            _converter = converter ?? throw new ArgumentNullException(nameof(converter));
        }

        private CoreRow? GetRow(object item)
        {
            try
            {
                var row = item as DataRowView;
                if (row != null)
                {
                    var index = row.Row.Table.Rows.IndexOf(row.Row);
                    return _grid.Data.Rows[index];
                }
                return null;
            }
            catch
            {
                return null;
            }
        }
        
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var row = GetRow(value);
            if (row == null)
                return DependencyProperty.UnsetValue;
            
            var column = parameter as String;
            if (String.IsNullOrWhiteSpace(column))
                return DependencyProperty.UnsetValue;
            
            return _converter.Invoke(row,column) ?? DependencyProperty.UnsetValue;
        }
        
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }
    
}