using BS.Shared.Exceptions;
using BS.Shared.Extensions;
using BS.Shared.Interface;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace BS.Shared.Core
{
	public static class ValidatorExtended
	{
		public static void ValidateGkvAbrechnung(IGkvAbrechnung gkvAbrechnung, IEnumerable<IInvoiceBase> invoiceBases, bool testInvoicesEmpty = true)
		{
			string error = null;

			if (testInvoicesEmpty && !invoiceBases.Any())
				error = "Keine Rechnungen gefunden";
			else if (!AreAllAddressSame(invoiceBases))
				error = "Unterschiedliche Rechnungspositionen";
			else if (GetInvalidUnitDescription(invoiceBases) is IInvoiceItem invalid)
				error = $"Ungültige Rechnungsposition: {invalid.ItemDescription}:{invalid.UnitDescription}";
			else if (GkvValidator.ValidateInvoiceBases(invoiceBases) is string rtn_error)
				error = rtn_error;

			if(error is string)
				throw new GkvException(error, "Validierung");
		}

		public static bool TryValidateGkvAbrechnung(IGkvAbrechnung gkvAbrechnung, IEnumerable<IInvoiceBase> invoiceBases, out string error, bool testInvoicesEmpty = true)
		{
			error = "default";

			try
			{
				ValidateGkvAbrechnung(gkvAbrechnung, invoiceBases, testInvoicesEmpty);

				return true;
			}
			catch (GkvException gkv)
			{
				error = gkv.Message;
			}
			catch (Exception)
			{

			}

			return false;
		}

		public static bool AreAllAddressSame(IEnumerable<IInvoiceBase> invoiceBases)
			=> invoiceBases.Select(x => x.SenderAddressToString()).AreAllTheSame();

		public static IInvoiceItem GetInvalidUnitDescription(IEnumerable<IInvoiceBase> invoiceBases){
			foreach(var invoiceBase in invoiceBases)
			{
				if (invoiceBase.IInvoiceItems is null && !invoiceBase.IInvoiceItems.Any())
					continue;

				foreach (var invoiceitem in invoiceBase.IInvoiceItems)
				{
					// GPos. 123456
					// 0123456
					var desc = invoiceitem.UnitDescription;
					if (desc.Length < 8)
						return invoiceitem;
				}
			}

			return null;
		}

		
	}
}