using System;
using System.Collections.Generic;
using Tanshu.Accounts.Contracts;
using Tanshu.Accounts.Entities;
using Tanshu.Common;
using Tanshu.Common.Helpers;
using System.Linq;
using NHibernate.Transform;
using NHibernate.Criterion;
using NHibernate;

namespace Tanshu.Accounts.Repository
{
    public class SalesAnalysisBI
    {
        protected readonly ISession _session;
        public SalesAnalysisBI()
        {
            _session = SessionManager.Session;
        }

        public IList<SalesAnalysis> GetSaleAnalysis(DateTime startDate, DateTime finishDate)
        {
            var start = startDate.Date.AddHours(6);
            var finish = finishDate.Date.AddDays(1).AddHours(5);
            List<SalesAnalysis> list = new List<SalesAnalysis>();
            if (finish <= start)
                return list;
            list.AddRange(GetSale(start, finish));
            list.Add(new SalesAnalysis() { GroupType = "  --  ", Amount = 0 });
            list.AddRange(GetSettlements(start, finish));
            list.Add(new SalesAnalysis() { GroupType = "  --  ", Amount = 0 });
            var sc = GetServiceCharge(start, finish);
            if (sc != null)
                list.Add(sc);
            var st = GetServiceTax(start, finish);
            if (st != null)
                list.Add(st);
            list.AddRange(GetVat(start, finish));
            return list;
        }
        private IList<SalesAnalysis> GetSale(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select g.GroupType as GroupType, Sum(i.Quantity * i.Price * (1 - i.Discount)) as Amount
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
inner join i.Product p
inner join p.ProductGroup g
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false
and exists (select Voucher from VoucherSettlement vs where vs.Voucher = v 
and vs.Settled != :noCharge and vs.Settled != :unsettled and vs.Settled != :amount and vs.Settled != :roundoff  and vs.Settled != :staff)
group by g.GroupType
order by g.GroupType
";
            var list = _session
               .CreateQuery(query)
               .SetParameter("startDate", startDate)
               .SetParameter("finishDate", finishDate)
               .SetParameter("noCharge", SettleOption.NoCharge)
               .SetParameter("unsettled", SettleOption.Unsettled)
               .SetParameter("amount", SettleOption.Amount)
               .SetParameter("roundoff", SettleOption.RoundOff)
               .SetParameter("staff", SettleOption.Staff)
               .List<object[]>();
            var outList = new List<SalesAnalysis>();
            decimal amount = 0;
            foreach (var item in list)
            {
                amount += (decimal)item[1];
                outList.Add(new SalesAnalysis() { GroupType = (string)item[0], Amount = (decimal)item[1] });
            }
            outList.Add(new SalesAnalysis() { GroupType = "Total Settled", Amount = amount });
            return outList;
        }
        private IList<SalesAnalysis> GetSettlements(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select s.Settled, Sum(s.Amount)
from Voucher v 
inner join v.Settlements s
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false
group by s.Settled
order by s.Settled
";
            var list = _session
               .CreateQuery(query)
               .SetParameter("startDate", startDate)
               .SetParameter("finishDate", finishDate)
               .List<object[]>();
            var outList = new List<SalesAnalysis>();
            decimal amount = 0;
            foreach (var item in list)
            {
                amount += (decimal)item[1];
                outList.Add(new SalesAnalysis() { GroupType = ((SettleOption)item[0]).Display(), Amount = (decimal)item[1] });
            }
            outList.Add(new SalesAnalysis() { GroupType = "Total", Amount = amount });
            return outList;
        }
        private SalesAnalysis GetServiceCharge(DateTime startDate, DateTime finishDate)
        {
            var query = @"
select coalesce(Sum(i.Quantity * i.Price * (1 - i.Discount) * i.ServiceCharge), 0)
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false
and exists (select Voucher from VoucherSettlement vs where vs.Voucher = v 
and vs.Settled != :noCharge and vs.Settled != :unsettled and vs.Settled != :amount and vs.Settled != :roundoff and vs.Settled != :staff)
";
            var amt = _session
                          .CreateQuery(query)
                          .SetParameter("startDate", startDate)
                          .SetParameter("finishDate", finishDate)
                          .SetParameter("noCharge", SettleOption.NoCharge)
                          .SetParameter("unsettled", SettleOption.Unsettled)
                          .SetParameter("amount", SettleOption.Amount)
                          .SetParameter("roundoff", SettleOption.RoundOff)
                          .SetParameter("staff", SettleOption.Staff)
                          .UniqueResult<decimal>();
            if (amt != 0)
                return new SalesAnalysis() { GroupType = "Service Charge", Amount = amt };
            return null;
        }
        private SalesAnalysis GetServiceTax(DateTime startDate, DateTime finishDate)
        {
            var query = @"
select coalesce(Sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end) * i.ServiceTaxRate), 0)
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false 
and exists (select Voucher from VoucherSettlement vs where vs.Voucher = v 
and vs.Settled != :noCharge and vs.Settled != :unsettled and vs.Settled != :amount and vs.Settled != :roundoff and vs.Settled != :staff)
";
            var amt = _session
               .CreateQuery(query)
               .SetParameter("startDate", startDate)
               .SetParameter("finishDate", finishDate)
               .SetParameter("noCharge", SettleOption.NoCharge)
               .SetParameter("unsettled", SettleOption.Unsettled)
               .SetParameter("amount", SettleOption.Amount)
               .SetParameter("roundoff", SettleOption.RoundOff)
               .SetParameter("staff", SettleOption.Staff)
               .UniqueResult<decimal>();
            if (amt != 0)
                return new SalesAnalysis() { GroupType = "Service Tax", Amount = amt };
            return null;
        }
        private IList<SalesAnalysis> GetVat(DateTime startDate, DateTime finishDate)
        {
            var outList = new List<SalesAnalysis>();
            var query = @"
select va.Name, i.VatRate, coalesce(Sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end) * i.VatRate), 0)
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
inner join i.Vat va
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false 
and exists (select Voucher from VoucherSettlement vs where vs.Voucher = v 
and vs.Settled != :noCharge and vs.Settled != :unsettled and vs.Settled != :amount and vs.Settled != :roundoff and vs.Settled != :staff)
group by i.VatRate, va.Name
";
            var list = _session
               .CreateQuery(query)
               .SetParameter("startDate", startDate)
               .SetParameter("finishDate", finishDate)
               .SetParameter("noCharge", SettleOption.NoCharge)
               .SetParameter("unsettled", SettleOption.Unsettled)
               .SetParameter("amount", SettleOption.Amount)
               .SetParameter("roundoff", SettleOption.RoundOff)
               .SetParameter("staff", SettleOption.Staff)
               .List<object[]>();
            foreach (var item in list)
                if ((decimal)item[2] != 0)
                    outList.Add(new SalesAnalysis() { GroupType = string.Format("{0} - {1:#.##%}", (string)item[0], (decimal)item[1]), Amount = (decimal)item[2] });
            return outList;
        }
    }
}