using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

using System.Windows.Media;

namespace ZadaniaWPF
{
	public class BoolToBrushConverter : IValueConverter
	{
		public Brush KolorDlaFałszu { get; set; } = Brushes.Black;
		public Brush KolorDlaPrawdy { get; set; } = Brushes.Gray;

		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			bool bvalue = (bool)value;
			return !bvalue ? KolorDlaFałszu : KolorDlaPrawdy;
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}

	public class PriorytetZadaniaToString : IValueConverter
	{
		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			Model.PriorytetZadania priorytetZadania = (Model.PriorytetZadania)value;
			return Model.Zadanie.OpisPriorytetu(priorytetZadania);
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			string opisPriorytetu = (value as string).ToLower();
			return Model.Zadanie.ParsujOpisPriorytetu(opisPriorytetu);
		}
	}

	public class PriorytetZadaniaToBrush : IValueConverter
	{
		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			Model.PriorytetZadania priorytetZadania = (Model.PriorytetZadania)value;
			switch (priorytetZadania)
			{
				case Model.PriorytetZadania.MniejWażne:
					return Brushes.Olive;
				case Model.PriorytetZadania.Ważne:
					return Brushes.Orange;
				case Model.PriorytetZadania.Krytyczne:
					return Brushes.OrangeRed;
				default:
					throw new Exception("Nierozpoznany priorytet zadania");
			}
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}

	public class BoolToTextDecorationConverter : IValueConverter
	{
		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			bool bvalue = (bool)value;
			return bvalue ? TextDecorations.Strikethrough : null;
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}

	public class ZadanieConverter : IMultiValueConverter
	{
		PriorytetZadaniaToString pzts = new PriorytetZadaniaToString();

		public object Convert(object[] values, Type targetType, object parameter,
							  CultureInfo culture)
		{
			string opis = (string)values[0];
			DateTime terminUtworzenia = DateTime.Now;
			DateTime? planowanyTerminRealizacji = (DateTime?)values[1];
			Model.PriorytetZadania priorytet = (Model.PriorytetZadania)pzts.ConvertBack(
				values[2], typeof(Model.PriorytetZadania), null,
				CultureInfo.CurrentCulture);
			if (!string.IsNullOrWhiteSpace(opis) && planowanyTerminRealizacji.HasValue)
				return new ModelWidoku.Zadanie(opis, terminUtworzenia,
					planowanyTerminRealizacji.Value, priorytet, false);
			else return null;
		}

		public object[] ConvertBack(object value, Type[] targetTypes, object parameter,
									CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}
}
