using Comal.Classes;
using Comal.Stores;
using InABox.Core;
using System;
using System.Linq;

namespace PRSStores
{
    public class JobRequisitionItemStore : BaseStore<JobRequisitionItem>
    {
        protected override void BeforeSave(JobRequisitionItem item)
        {
            if (item.ID != Guid.Empty)
            {
                var table = DoQuery(item);
                item = DoStatusChecks(item, table);
            }
            base.BeforeSave(item);
        }

        private CoreTable DoQuery(JobRequisitionItem item)
        {
            return Provider.Query<StockMovement>(
               new Filter<StockMovement>(x => x.JobRequisitionItem.ID).IsEqualTo(item.ID),
               new Columns<StockMovement>(
                   x => x.Received,
                    x => x.Style.ID
                   ));
        }

        public static JobRequisitionItem DoStatusChecks(JobRequisitionItem item, CoreTable table)
        {
            if (item.Cancelled != DateTime.MinValue)
                item.Status = JobRequisitionItemStatus.Cancelled;
            else if (item.Archived != DateTime.MinValue)
                item.Status = JobRequisitionItemStatus.Archived;
            //this can only get set from the "Create Treatment PO" custom module
            else if (item.Status == JobRequisitionItemStatus.TreatmentOnOrder || item.Status == JobRequisitionItemStatus.TreatmentReceived)
            {
                if (item.PurchaseOrderItem.ReceivedDate != DateTime.MinValue)
                    item.Status = JobRequisitionItemStatus.TreatmentReceived;
            }
            else if (item.Ordered != DateTime.MinValue && item.PurchaseOrderItem.ReceivedDate == DateTime.MinValue)
                item.Status = JobRequisitionItemStatus.OnOrder;
            else if (item.PurchaseOrderItem.ReceivedDate != DateTime.MinValue)
            {
                item.Status = JobRequisitionItemStatus.Received;
                item = CheckReservedOrTreatmentRequired(item, table);
            }
            else if (item.Status == JobRequisitionItemStatus.OrderRequired)
                return item;
            else
                item = CheckReservedOrTreatmentRequired(item, table);

            return item;
        }



        private static JobRequisitionItem CheckReservedOrTreatmentRequired(JobRequisitionItem item, CoreTable table)
        {
            if (!table.Rows.Any())
            {
                item.Status = JobRequisitionItemStatus.NotChecked;
                return item;
            }

            bool treatmentRequired = false;
            double total = 0;
            foreach (var row in table.Rows)
            {
                total = total + row.Get<StockMovement, double>(x => x.Received);
                if (row.Get<StockMovement, Guid>(x => x.Style.ID) != item.Style.ID)
                    treatmentRequired = true;
            }

            if (total >= item.Qty)
            {
                item.Status = JobRequisitionItemStatus.Allocated;
                if (treatmentRequired)
                    item.Status = JobRequisitionItemStatus.TreatmentRequired;
            }
            else
                item.Status = JobRequisitionItemStatus.NotChecked;

            return item;
        }
    }
}