using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows.Data;
using System.Windows.Markup;
using System.Windows.Media;
using BeWo.View.Detail;
using BeWo.ViewModel;
using BS.Shared.DataContracts;
using DevExpress.Xpf.Grid;

namespace BeWo.Converter
{
    public class CellColorConverter : MarkupExtension, IMultiValueConverter
    {
        public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
        {
            Brush b = new SolidColorBrush(Color.FromArgb(255, 233, 233, 233));

            if (value[1].ToString().Equals(string.Empty))
                return b;

            var cellData = value[0] as EditGridCellData;
            var viewTag = cellData.View.Tag as List<AdditionalServiceBookingVM>;
            var date = int.Parse(value[1].ToString().Split('.')[0], NumberStyles.Integer);

            
            if (viewTag != null && viewTag.Count > 0 && value.Length > 2 && value[2] is Teilnehmer)
            {
                var booking = viewTag[0];

                if (date <= DateTime.DaysInMonth(booking.Date.Year, booking.Date.Month))
                {

                    var dt = new DateTime(booking.Date.Year, booking.Date.Month, date);

                    if (dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday)
                    {
                        return Brushes.CornflowerBlue;
                    }

                    var t = (Teilnehmer) value[2];

                    if (IsAbsence(dt, t.Customer.AbsenceTimes))
                    {
                        return Brushes.LightGray;
                    }
                }
            }
            return viewTag.Any(v => v.Date.Day.Equals(date)) ? Brushes.White : b;
        }

        private bool IsAbsence(DateTime dt, List<AbsenceTimeDC> absenceTimes)
        {
            if (absenceTimes == null)
            {
                return false;
            }
            foreach (var at in absenceTimes)
            {
                if ((!at.Start.HasValue || at.Start.Value <= dt) && (!at.End.HasValue || at.End.Value >= dt))
                {
                    return true;
                }
            }

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

        public override object ProvideValue(IServiceProvider serviceProvider) { return this; }
    }
}