using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using Weee.DAL;
using Weee.Models;
using Weee.Models.ExtensionMethods;
using Weee.Models.Paramemter;

namespace Weee.Service
{
    public class WaterUsageDataService : WeeeLCADataService
    {
        public WaterUsageDataService(WeeeDataContext db)
            : base(db)
        {
        }


        #region

        // if the sheet is monthly data : page , search page size do not care 
        public IQueryable<TEntity> GetSheet<TEntity>(int LCAID) where TEntity : class, RiskAssmtSheetData
        {
            if (!AuthorizedLCAs.Contains(LCAID)) throw new Exception("not authorized");
            return _db.Set<TEntity>().Where(x => x.LCAID == LCAID)
                .OrderByDescending(x => x.ID);
        }

        public IEnumerable<RiskAssmtSheetData> SaveSheet(IEnumerable<RiskAssmtSheetData> ToBeSave)
        {
            var user = GetUserContext();

            foreach (var item in ToBeSave)
            {
                if (!AuthorizedLCAs.Contains(item.LCAID)) throw new Exception("not authorized");
                var entry = _db.Entry(item);
                if (item.ID == 0)
                {
                    item.CreatedBy = user.Id;
                    item.CreatedDate = DateTime.Now;
                    entry.State = EntityState.Added;
                }
                else
                {
                    item.ModifiedBy= user.Id;
                    item.ModifiedDate = DateTime.Now;
                    entry.State = EntityState.Modified;
                }
            }
            _db.SaveChanges();
            return ToBeSave;
        }

        public SheetHeader GetSheetHeader(int LCAID, Categories cate)
        {
            if (!AuthorizedLCAs.Contains(LCAID)) throw new Exception("not authorized");
            var sheetheader = _db.SheetHeaders.Find(new object[] { LCAID, cate });
            if (sheetheader == null)
                return new SheetHeader();
            else
                return _db.SheetHeaders.Find(new object[] { LCAID, cate });
        }
        public void SaveSheetHeader(SheetHeader header)
        {
            if (!AuthorizedLCAs.Contains(header.LCAID)) throw new Exception("not authorized");
            var a = _db.SheetHeaders.Find(new object[] { header.LCAID, header.Category });
            if (a == null) _db.SheetHeaders.Add(header);
            else
            {
                _db.Entry(a).State = EntityState.Detached;
                _db.Entry(header).State = EntityState.Modified;
            }
            _db.SaveChanges();
        }

        public RiskAssmtSheetData SaveSheetItem(RiskAssmtSheetData toBeSave)
        {
            var user = GetUserContext();

            if (!AuthorizedLCAs.Contains(toBeSave.LCAID)) throw new Exception("not authorized");
            var entry = _db.Entry(toBeSave);
            if (toBeSave.ID == 0)
            {
                toBeSave.CreatedBy = user.Id;
                toBeSave.CreatedDate = DateTime.Now;
                entry.State = EntityState.Added;
            }
            else
            {
                toBeSave.ModifiedBy = user.Id;
                toBeSave.ModifiedDate = DateTime.Now;
                entry.State = EntityState.Modified;
                entry.Property(x => x.LCAID).IsModified = false;
            }

            _db.SaveChanges();
            return toBeSave;
        }

        public void DeleteSheet<TEntity>(int LCAID) where TEntity : class, RiskAssmtSheetData
        {
            var LCA = GetLCA(LCAID);
            if (LCA.Status != LCAStatus.New
                && LCA.Status != LCAStatus.Processing
                && LCA.Status != LCAStatus.Rejected) throw new Exception("Business logic error , should not delete sheet data in this status: " + LCA.Status.ToString());
            var entries = _db.Set<TEntity>().Where(x => x.LCAID == LCAID);
            foreach (var entry in entries)
            {
                var ToBeDelete = _db.Entry(entry);
                ToBeDelete.State = EntityState.Deleted;
            }
            _db.SaveChanges();
        }

        public void DeleteMaterials(int LCAID, MaterialType MType)
        {
            if (!AuthorizedLCAs.Contains(LCAID)) throw new Exception("Not authroize");
            var mats = _db.ProductLCAProductSurveyForm_Material.Where(x => x.LCAID == LCAID && x.MaterialType == MType);
            _db.ProductLCAProductSurveyForm_Material.RemoveRange(mats);
            _db.SaveChanges();
        }

        public void DeleteSheetItem<TEntity>(int ID) where TEntity : class, RiskAssmtSheetData
        {
            var entry = _db.Set<TEntity>().Where(x => x.ID == ID).Single();
            var LCA = GetLCA(entry.LCAID);
            if (LCA.Status != LCAStatus.New && LCA.Status != LCAStatus.Processing) throw new Exception("Business logic error , should not delete sheet data in this status: " + LCA.Status.ToString());

            var ToBeDelete = _db.Entry(entry);
            ToBeDelete.State = EntityState.Deleted;

            _db.SaveChanges();
        }
        #endregion
    }
}