using System;
using System.Collections.Generic;
using Tanshu.Accounts.Entities;
using Tanshu.Accounts.Entities.Auth;
using NHibernate;
using System.Linq;
using Tanshu.Common.Helpers;

namespace Tanshu.Accounts.Repository
{
    public class VoucherSettlementBI : UnitOfWork<VoucherSettlement>
    {
        public static void UpdateSettlements(IList<VoucherSettlement> list, decimal amount)
        {
            amount = Math.Round(amount, 5);
            if (list.Count(x => x.Settled == SettleOption.Amount) == 0)
                list.Add(new VoucherSettlement() { Amount = amount, Settled = SettleOption.Amount });
            else
                list.Single(x => x.Settled == SettleOption.Amount).Amount = amount;

            var roundoff = Math.Round(amount) - amount;
            if (list.Count(x => x.Settled == SettleOption.RoundOff) == 0)
                list.Add(new VoucherSettlement() { Amount = roundoff, Settled = SettleOption.RoundOff });
            else
                list.Single(x => x.Settled == SettleOption.RoundOff).Amount = roundoff;

            var balance = list.Where(x => x.Settled != SettleOption.Unsettled).Sum(x => x.Amount) * -1;
            if (list.Count(x => x.Settled == SettleOption.Unsettled) == 0)
            {
                if (balance != 0)
                    list.Add(new VoucherSettlement() { Amount = balance, Settled = SettleOption.Unsettled });
            }
            else 
                list.Single(x => x.Settled == SettleOption.Unsettled).Amount = balance;
        }

        public void SettleVoucher(User user, Guid voucherID, IDictionary<SettleOption, decimal> values)
        {
            var voucher = _session.Get<Voucher>(voucherID);

            for (var i = voucher.Settlements.Count - 1; i >= 0; i--)
            {
                var item = voucher.Settlements[i];
                if (item.Settled == SettleOption.Amount || item.Settled == SettleOption.RoundOff || item.Settled == SettleOption.Unsettled)
                    _session.Update(item);
                if (!values.ContainsKey(item.Settled))
                {
                    voucher.Settlements.Remove(item);
                    _session.Delete(item);
                }
                else
                {
                    item.Amount = values[item.Settled];
                    _session.Update(item);
                }
            }
            foreach (var item in values)
            {
                if (voucher.Settlements.Count(x => x.Settled == item.Key) == 0)
                {
                    var set = new VoucherSettlement { Settled = item.Key, Amount = item.Value, Voucher = voucher };
                    voucher.Settlements.Add(set);
                    _session.Save(set);
                }
            }
            voucher.User = user;
            _session.Update(voucher);

            if (voucher.Settlements.Count(x => x.Settled == SettleOption.Unsettled) == 0 || voucher.Void)
            {
                var table = _session.QueryOver<FoodTable>()
                    .Where(x => x.FoodTableID == voucher.Table.FoodTableID && x.VoucherID == voucher.VoucherID)
                    .SingleOrDefault();
                if (table != null)
                {
                    table.VoucherID = null;
                    table.Status = null;
                    _session.Update(table);
                }
            }
        }
    }
}