using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using EnVisage.Models;

namespace EnVisage.Code.BLL
{
    public class CreditDepartmentManager : ManagerBase<CreditDepartment, CreditDepartmentModel>
    {
        public CreditDepartmentManager(EnVisageEntities dbContext)
            : base(dbContext)
        {
        }
        protected override CreditDepartment InitInstance()
        {
            return new CreditDepartment { Id = Guid.NewGuid() };
        }

        protected override CreditDepartment RetrieveReadOnlyById(Guid key)
        {
            return DataTable.AsNoTracking().FirstOrDefault(t => t.Id == key);
        }

        public override DbSet<CreditDepartment> DataTable
        {
            get
            {
                return DbContext.CreditDepartments;
            }
        }

        public CreditDepartmentModel LoadCreditDepartmentModel(Guid departmentId)
        {
            if (departmentId == Guid.Empty)
                return null;

            return CreditDepartmentModelBasicQuery.FirstOrDefault(x => x.Id == departmentId);
        }

        public List<CreditDepartmentModel> LoadCreditDepartments()
        {
            return CreditDepartmentModelBasicQuery.ToList();
        }

		public List<CreditDepartmentModel> GetCreditDepartmentsByExpCats(IEnumerable<Guid> expCats)
		{
			if (expCats == null)
				return LoadCreditDepartments();

			var result = DbContext.CreditDepartments.Include(x => x.ExpenditureCategory)
				.Where(x => x.ExpenditureCategory.Where(e => expCats.Contains(e.Id)).Any())
				.Select(x => new CreditDepartmentModel()
				{
					Id = x.Id,
					Name = x.Name,
					CreditNumber = x.CreditNumber
				}).ToList();

			return result;
		}

		#region Private Members

		private IQueryable<CreditDepartmentModel> CreditDepartmentModelBasicQuery
        {
            get
            {
                var query = DataTable.Include(x => x.ExpenditureCategory).AsNoTracking()
                                     .Select(x =>
                new CreditDepartmentModel()
                {
                    Id = x.Id,
                    Name = x.Name,
                    CreditNumber = x.CreditNumber,
                    ExpenditureCategoryCount = x.ExpenditureCategory.Count
                });

                return query;
            }
        }

        #endregion
    }
}