using PersonalFinance;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;

namespace PersonalFinanceWindow.ViewModel
{
    class ViewModelBase : INotifyPropertyChanged
    {
        public static EntityContext ctx;

        public ViewModelBase()
        {
            //ctx = new EntityContext();
            ctx = getContextInstance();
            PersonalFinance.Entity.Scheduler s = new PersonalFinance.Entity.Scheduler(ctx);
        }

        public EntityContext getContextInstance()
        {
            if (ctx != null) return ctx;
            else return new EntityContext(); 
        }

        protected void Set<T>(ref T oldVal, T newVal, [CallerMemberName]string propertyName="")
        {
            oldVal = newVal;
            NotifyPropertyChanged(propertyName);
            if(propertyName.Equals("Payments", StringComparison.CurrentCultureIgnoreCase))
            {
                string s = "";
                foreach (PersonalFinance.Payment p in (BindingList<PersonalFinance.Payment>)(object)newVal) {
                    s += " "+p.PaymentId;
                }
                //MessageBox.Show("Property " + propertyName + " set and notify changed. " + "IDs: " + s);
            }
        }
        protected void NotifyPropertyChanged([CallerMemberName] string propertyName="")
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public void SaveContext()
        {
            ctx.SaveChanges();
        }
    }

    [ValueConversion(typeof(List<string>), typeof(string))]
    public class ListToStringConverter : IValueConverter
    {

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (targetType != typeof(string))
                throw new InvalidOperationException("The target must be a String");
            
            if (value != null)
            {
                return String.Join(", ", ((List<string>)value).ToArray());
            }
            else
            {
                return null;
            }
        }

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