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 partial class VoucherBI : UnitOfWork<Voucher>
    {
        private IDictionary<SettleOption, decimal> GetSettlementOptions(Voucher voucher)
        {
            IDictionary<SettleOption, decimal> options = new Dictionary<SettleOption, decimal>();
            foreach (var item in voucher.Settlements)
            {
                if (item.Settled == SettleOption.Amount || item.Settled == SettleOption.RoundOff || item.Settled == SettleOption.Unsettled)
                    continue;
                if (options.ContainsKey(item.Settled))
                    options[item.Settled] += item.Amount;
                else
                    options.Add(item.Settled, item.Amount);
            }
            return options;
        }

        public void UpdateSettlements(Voucher voucher, IDictionary<SettleOption, decimal> values)
        {
            var amount = Math.Round(-1 * voucher.Kots.Sum(x => x.Inventories.Sum(y => y.Amount)), 5);
            values.Add(SettleOption.Amount, Math.Round(amount, 5));
            var roundoff = Math.Round(amount) - amount;
            if (roundoff != 0)
                values.Add(SettleOption.RoundOff, roundoff);
            var unsettled = values.Sum(x => x.Value) * -1;
            if (unsettled != 0)
                values.Add(SettleOption.Unsettled, unsettled);

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

        }

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