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 : FluentBasicBase
    {
        public VoucherSettlementBI()
            : base()
        { }
        public VoucherSettlementBI(bool beginTransaction)
            : base(beginTransaction)
        { }
        public VoucherSettlementBI(ISession session)
            : base(session)
        { }
        public VoucherSettlementBI(ISession session, bool beginTransaction)
            : base(session, beginTransaction)
        { }

        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 if (balance == 0)
                list.Remove(list.Single(x => x.Settled == SettleOption.Unsettled));
            else
                list.Single(x => x.Settled == SettleOption.Unsettled).Amount = balance;
        }

        public void SettleVoucher(User user, int 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)
                    continue;
                if (!values.ContainsKey(item.Settled))
                    voucher.Settlements.Remove(item);
                else
                    item.Amount = values[item.Settled];

            }
            foreach (var item in values)
            {
                if (voucher.Settlements.Count(x => x.Settled == item.Key) == 0)
                    voucher.Settlements.Add(new VoucherSettlement { Settled = item.Key, Amount = item.Value });
            }
            var amount = -1 * voucher.Kots.Sum(x => x.Inventories.Sum(y => y.Amount));
            UpdateSettlements(voucher.Settlements, amount);
            voucher.User = user;
            voucher.SetValue(VoucherFields.LastEditDate, DbValues.Date);
            Session.Update(voucher);
            using (var ft = new FoodTableBI(Session, false))
                ft.TableSettled(voucher);
        }
    }
}