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

namespace Comal.Stores
{
    public class EmployeeProductStore : BaseStore<EmployeeProduct>
    {
        private void CheckIssue(EmployeeProduct entity)
        {
            if (entity.Issued.IsEmpty())
            {
                if (entity.IssuedMovement.IsValid())
                {
                    var movement = new StockMovement { ID = entity.IssuedMovement.ID };
                    FindSubStore<StockMovement>().Delete(movement, "Employee/Product Issue Deleted");
                    entity.IssuedMovement.ID = Guid.Empty;
                }
            }
            else
            {
                if (!entity.IssuedMovement.IsValid())
                {
                    var movement = new StockMovement();
                    movement.Product.ID = entity.Product.ID;
                    movement.Location.ID = entity.Product.DefaultLocation.ID;
                    movement.Date = entity.Issued;
                    movement.Issued = entity.Quantity;
                    movement.Received = 0.0F;
                    
                    movement.Dimensions.Unit.ID = entity.Product.Dimensions.Unit.ID;
                    movement.Dimensions.Unit.Synchronise(entity.Product.Dimensions);
                    movement.Dimensions.Length = entity.Product.Dimensions.Length;
                    movement.Dimensions.Width = entity.Product.Dimensions.Width;
                    movement.Dimensions.Height = entity.Product.Dimensions.Height;
                    movement.Dimensions.Weight = entity.Product.Dimensions.Weight;
                    
                    movement.Qty = 0.0F - movement.Issued * movement.Dimensions.Value;
                    movement.Notes = string.Format("Issued to " + entity.Employee.Name);
                    FindSubStore<StockMovement>().Save(movement, "Employee/Product Issue Created");
                    entity.IssuedMovement.ID = movement.ID;
                }
                else
                {
                    var movement = Provider.Load(new Filter<StockMovement>(x => x.ID).IsEqualTo(entity.IssuedMovement.ID)).FirstOrDefault();
                    if (movement == null)
                        movement = new StockMovement();
                    movement.Product.ID = entity.Product.ID;
                    movement.Dimensions.CopyFrom(entity.Product.Dimensions);
                    movement.Location.ID = entity.Product.DefaultLocation.ID;
                    movement.Date = entity.Issued;
                    movement.Issued = entity.Quantity;
                    movement.Received = 0.0F;
                    movement.Qty = 0.0F - movement.Issued * movement.Dimensions.Value;
                    movement.Notes = string.Format("Issued to " + entity.Employee.Name);
                    FindSubStore<StockMovement>().Save(movement, "Employee/Product Issue Updated");
                    entity.IssuedMovement.ID = movement.ID;
                }
            }
        }

        private void CheckReturn(EmployeeProduct entity)
        {
            if (entity.Returned.IsEmpty())
            {
                if (entity.ReturnedMovement.IsValid())
                {
                    var movement = new StockMovement { ID = entity.ReturnedMovement.ID };
                    FindSubStore<StockMovement>().Delete(movement, "Employee/Product Return Deleted");
                    entity.ReturnedMovement.ID = Guid.Empty;
                }
            }
            else
            {
                if (!entity.ReturnedMovement.IsValid())
                {
                    var movement = new StockMovement();
                    movement.Product.ID = entity.Product.ID;
                    movement.Dimensions.CopyFrom(entity.Product.Dimensions);
                    movement.Location.ID = entity.Product.DefaultLocation.ID;
                    movement.Date = entity.Returned;
                    movement.Issued = 0.0F;
                    movement.Received = entity.Quantity;
                    movement.Qty = movement.Received * movement.Dimensions.Value;
                    movement.Notes = string.Format("Returned by " + entity.Employee.Name);
                    FindSubStore<StockMovement>().Save(movement, "Employee/Product Return Created");
                    entity.ReturnedMovement.ID = movement.ID;
                }
                else
                {
                    var movement = Provider.Load(new Filter<StockMovement>(x => x.ID).IsEqualTo(entity.ReturnedMovement.ID)).FirstOrDefault();
                    if (movement == null)
                        movement = new StockMovement();
                    movement.Product.ID = entity.Product.ID;
                    movement.Dimensions.CopyFrom(entity.Product.Dimensions);
                    movement.Location.ID = entity.Product.DefaultLocation.ID;
                    movement.Date = entity.Returned;
                    movement.Issued = 0.0F;
                    movement.Received = entity.Quantity;
                    movement.Qty = movement.Received * movement.Dimensions.Value;
                    movement.Notes = string.Format("Returned by " + entity.Employee.Name);
                    FindSubStore<StockMovement>().Save(movement, "Employee/Product Return Updated");
                    entity.ReturnedMovement.ID = movement.ID;
                }
            }
        }

        protected override void BeforeSave(EmployeeProduct entity)
        {
            base.BeforeSave(entity);
            CheckIssue(entity);
            CheckReturn(entity);
        }

        protected override void BeforeDelete(EmployeeProduct entity)
        {
            base.BeforeDelete(entity);
            var movements = Provider.Load(new Filter<StockMovement>(x => x.ID).IsEqualTo(entity.IssuedMovement.ID).Or(x => x.ID)
                .IsEqualTo(entity.ReturnedMovement.ID));
            FindSubStore<StockMovement>().Delete(movements, "Entity/Product Deleted");
        }
    }
}