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

namespace EnVisage.Code.BLL
{
    public class ExpenditureCategoryManager : ManagerBase<ExpenditureCategory, ExpenditureCategoryModel>
	{
		public ExpenditureCategoryManager(): base(null)
		{
		}

		public ExpenditureCategoryManager(EnVisageEntities dbContext): base(dbContext)
		{
		}
		protected override ExpenditureCategory InitInstance()
		{
			return new ExpenditureCategory { Id = Guid.NewGuid() };
		}

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

		public override DbSet<ExpenditureCategory> DataTable => DbContext.ExpenditureCategory;

		#region Public Methods
		/// <summary>
		/// Loads a Expenditure Category from the database.
		/// </summary>
		/// <param name="value">Unique identifier of the Expenditure Category.</param>
		/// <param name="isReadOnly">Indicates that object will not be saved later in the code. Use <b>false</b> if you need to save an updated object.</param>
		/// <returns>A <see cref="ExpenditureCategory"/> object retrieved from database.</returns>
		public override ExpenditureCategory Load(Guid? value, bool isReadOnly = true)
        {
            if (value == null || value == Guid.Empty)
                return new ExpenditureCategory();

            return isReadOnly
                       ? DbContext.ExpenditureCategory.AsNoTracking().FirstOrDefault(t => t.Id == value)
                       : DbContext.ExpenditureCategory.Find(value);
        }

        public override ExpenditureCategory Save(ExpenditureCategoryModel model)
        {
            if (model == null)
                throw new ArgumentNullException(nameof(model));

            #region Save ExpenditureCategory data
            ExpenditureCategory dbObj = null;
            if (model.Id != Guid.Empty)
                dbObj = DbContext.ExpenditureCategory.Find(model.Id);
            if (dbObj == null)
            {
                dbObj = new ExpenditureCategory { Id = Guid.NewGuid() };
            }
            model.CopyTo(dbObj);
            dbObj.CGEFX = "CG";
            if (model.Id == Guid.Empty)
	            DbContext.ExpenditureCategory.Add(dbObj);
            else
	            DbContext.Entry(dbObj).State = EntityState.Modified;
            #endregion

            if (IsContextLocal)
	            DbContext.SaveChanges();
	        return dbObj;
        }

        public ExpenditureDetail GetExpenditureDetails(Guid categoryId)
        {
            if (categoryId == Guid.Empty)
                throw new ArgumentException(Messages.Commonl_ArgumentEmpty, nameof(categoryId));

            var result = GetExpenditureDetails(true, new List<Guid> { categoryId });
            if (result.ContainsKey(categoryId))
                return result[categoryId];

            return null;
        }

        public Dictionary<Guid, ExpenditureDetail> GetExpenditureDetails(bool withSuperExpCats = true, List<Guid> categories = null)
        {
			var query = DbContext.VW_ExpenditureCategory.AsNoTracking().AsQueryable();

			if (categories != null && categories.Count > 0)
                query = query.Where(x => categories.Contains(x.Id));

			if (!withSuperExpCats)
				query = query.Where(x => x.AllowResourceAssignment);

			var result = query.AsParallel().Select(x => new ExpenditureDetail
			{
				ExpenditureCategoryId = x.Id,
				ExpenditureCategoryName = x.ExpCategoryWithCcName,
				UOMId = x.UOMId,
				UOMValue = x.UOMValue,
				CGEFX = x.CGEFX,
				CreditId = x.CreditId,
				GLId = x.GLId,
				SystemAttributeOne = x.SystemAttributeOne,
				SystemAttributeTwo = x.SystemAttributeTwo,
				Type = x.Type ?? 0,
				UseType = x.UseType ?? 1,
				AllowResourceAssignment = x.AllowResourceAssignment,
			}).ToDictionary(t => t.ExpenditureCategoryId);

			return result;
        }

		public Dictionary<string, ExpenditureDetail> GetSuperExpenditureDetails(IEnumerable<Guid> expenditures = null)
		{
			var query = (from e in DbContext.ExpenditureCategory.AsNoTracking()
						 join f in DbContext.VW_ExpenditureCategory.AsNoTracking() on e.Id equals f.Id
						 where !e.AllowResourceAssignment
						 orderby f.ExpCategoryWithCcName
						 select new ExpenditureDetail
						 {
							 ExpenditureCategoryId = e.Id,
							 ExpenditureCategoryName = f.ExpCategoryWithCcName,
							 UOMId = e.UOMId,
							 UOMValue = e.UOM.UOMValue,
							 CGEFX = e.CGEFX,
							 CreditId = e.CreditId,
							 GLId = e.GLId,
							 SystemAttributeOne = e.SystemAttributeOne,
							 SystemAttributeTwo = e.SystemAttributeTwo,
							 Type = e.Type ?? 0,
							 UseType = e.UseType ?? 1,
							 AllowResourceAssignment = e.AllowResourceAssignment,
						 });

			if (expenditures?.Any() == true)
				query = query.Where(x => expenditures.Contains(x.ExpenditureCategoryId));

			return query.ToDictionary(t => t.ExpenditureCategoryId.ToString());
		}

		public List<ExpenditureCategory> GetList(List<Guid> categories = null)
        {
            return GetBasic(categories).ToList();
        }

        public Dictionary<Guid, ExpenditureCategory> GetAsDictionary(List<Guid> categories = null)
        {
            return GetList(categories).ToDictionary(x => x.Id, g => g);
        }

		#endregion

		#region Private Methods

		private IQueryable<ExpenditureCategory> GetBasic(List<Guid> categories = null)
        {
            var query = DbContext.ExpenditureCategory.AsNoTracking().AsQueryable();
            if (categories != null && categories.Count >= 0)
                query = query.Where(x => categories.Contains(x.Id));

            return query;
        }

        #endregion
    }
}