using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Windows;
using BeWo.ServiceProxy;
using BS.Shared.Core;
using BS.Shared.DataContracts;
using BS.Shared.Extensions;
using DevExpress.DataAccess.Native.Web;
using DevExpress.Mvvm;
using DevExpress.Xpf.Editors;
using DevExpress.Xpf.Layout.Core;

namespace BeWo.ViewModel.ListViewModel
{
	public class InvoiceBaseListVM : AbstractDCListMapperVM<InvoiceBaseDC, InvoiceBaseVM>
	{
		public static string PropertyName_DateTimeSpanFilter = "DateTimeSpanFilter";

		public static string PropertyName_FilterResultAmountSum = "FilterResultAmountSum";
		public static string PropertyName_FilterResultAmountNotPaidSum = "FilterResultAmountNotPaidSum";

		private DateTimeSpan _DateTimeSpanFilter;
		private BindingList<InvoiceBaseVM> _FilteredInvoices;

		public InvoiceBaseListVM(List<InvoiceBaseDC> pDCs) : base(pDCs)
		{
			VMList.ListChanged += (s, e) => FirePropertyChanged(PropertyName_FilterResultAmountSum);
			VMList.ListChanged += (s, e) => FirePropertyChanged(PropertyName_FilterResultAmountNotPaidSum);

			bool canExecute(InvoiceBaseVM invoice_vm) => invoice_vm is object && true;
			ShowXRechnungCommand = new DelegateCommand<InvoiceBaseVM>(ShowXRechnung, canExecute);
		}

		public DelegateCommand<InvoiceBaseVM> ShowXRechnungCommand { get; set; }

		public DateTimeSpan DateTimeSpanFilter
		{
			get
			{
				return _DateTimeSpanFilter;
			}

			set
			{
				if (AreDifferent(_DateTimeSpanFilter, value))
				{
					_DateTimeSpanFilter = value;
					FirePropertyChanged(PropertyName_DateTimeSpanFilter);

				}
			}
		}

		public decimal? FilterResultAmountSum
		{
			get
			{
				return VMList.Sum(e => e.TotalAmount);
			}
		}
		public decimal? FilterResultAmountNotPaidSum
		{
			get
			{
				decimal? sum = 0.0m;
				foreach (var item in VMList)
					sum += item.IsPaid ? item.TotalAmount : 0;

				return FilterResultAmountSum - sum;
			}
		}

		public void ShowXRechnung(InvoiceBaseVM invoice_vm)
		{
			var invoice_base = invoice_vm;

			// Holt bereits geladene
			if (invoice_base.XRechnungStoredFileVM is StoredFileVM vm && vm.Data is byte[] bytes)
			{
				BeWoApp.MainControl.WindowService.ShowERechnungWindow(new MemoryStream(bytes));
				return;
			}

			// Noch nicht geladen
			var invoice_base_dc = invoice_base.DataContract;
			var invoice_base_oid = invoice_base_dc.InvoiceBaseOid ?? -1;
			var invoice_type = (int)invoice_base_dc.Type;
			var report_link = invoice_base.ReportLink;
			ServiceFacade.DoAccountingEnhancedServiceAsnyc(
				x => x.GetXRechnung(invoice_base_oid, invoice_type, report_link),
				response =>
				{
					if (response.Success)
					{
						if (response.Data.Item1 is StoredFileDC dc)
						{
							invoice_base.XRechnungStoredFileVM.UpdateByDataContract(dc);
						}

						bytes = response.Data.Item2;

						invoice_base.XRechnungStoredFileVM.Data = bytes;

						BeWoApp.MainControl.WindowService.ShowERechnungWindow(new MemoryStream(bytes));
					}
					else
					{
						MessageBox.Show(response.ToErrorString());
					}
				}
			);
		}

		internal void UpdateList(IList<InvoiceBaseDC> dcList)
		{
			VMList.Clear();
			VMList.AddRange(dcList.Select(CreateVM));

			FirePropertyChanged(PropertyName_FilterResultAmountSum);
			FirePropertyChanged(PropertyName_FilterResultAmountNotPaidSum);
		}

		internal void UpdateList(IList<InvoiceBaseVM> vmList)
		{
			VMList.Clear();
			VMList.AddRange(vmList);

			FirePropertyChanged(PropertyName_FilterResultAmountSum);
			FirePropertyChanged(PropertyName_FilterResultAmountNotPaidSum);
		}
	}
}