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

namespace EnVisage.Code.BLL
{
    public class ViewManager : ManagerBase<View, ViewModel>
    {
        public ViewManager(EnVisageEntities dbContext)
            : base(dbContext)
        {
        }

        public override View Save(ViewModel model)
        {
            var view = base.Save(model);

            if (Guid.Empty.Equals(model.Id))
            {
                model.Id = view.Id;

                if (model.UserId != null)
                {
                    foreach (var userId in model.UserId)
                    {
                        var user2View = DbContext.User2View.Create();
                        user2View.Id = Guid.NewGuid();
                        user2View.ViewId = view.Id;
                        user2View.UserId = userId;
                        DbContext.User2View.Add(user2View);
                    }
                }

                if (model.TeamId != null)
                {
                    foreach (var teamId in model.TeamId)
                    {
                        var team2View = DbContext.Team2View.Create();
                        team2View.Id = Guid.NewGuid();
                        team2View.ViewId = view.Id;
                        team2View.TeamId = teamId;
                        DbContext.Team2View.Add(team2View);
                    }
                }
            }
            else
            {
                var users = DbContext.User2View.Where(x => x.ViewId == model.Id).ToList();
                users.Where(x => model.UserId == null || !model.UserId.Contains(x.UserId))
                     .ToList()
                     .ForEach(x => DbContext.Entry(x).State = EntityState.Deleted);

                if (model.UserId != null)
                {
                    foreach (var userId in model.UserId.Where(c => users.All(x => x.UserId != c)))
                    {
                        var user2View = DbContext.User2View.Create();
                        user2View.Id = Guid.NewGuid();
                        user2View.ViewId = view.Id;
                        user2View.UserId = userId;
                        DbContext.Entry(user2View).State = EntityState.Added;
                    }
                }

                var team2Views = DbContext.Team2View.Where(x => x.ViewId == view.Id).ToList();
                team2Views.Where(x => model.TeamId == null || !model.TeamId.Contains(x.TeamId)).ToList().
                    ForEach(x => DbContext.Entry(x).State = EntityState.Deleted);

                if (model.TeamId != null)
                {
                    foreach (var teamId in model.TeamId.Where(c => !team2Views.Select(x => x.TeamId).Contains(c)))
                    {
                        var team2View = DbContext.Team2View.Create();
                        team2View.Id = Guid.NewGuid();
                        team2View.ViewId = view.Id;
                        team2View.TeamId = teamId;
                        DbContext.Entry(team2View).State = EntityState.Added;
                    }
                }
            }

            //env-753 start
            if (model.TeamId != null && model.UserId != null)
            {
                var users = model.UserId.Select(x => x.ToString());
                var user2teams = DbContext.User2Team.Where(x => model.TeamId.Contains(x.TeamId) && users.Contains(x.UserId)).ToList();
                foreach (var userId in model.UserId)
                {
                    foreach (var teamId in model.TeamId)
                    {
                        if (user2teams.Any(x => x.UserId.Equals(userId.ToString(), StringComparison.InvariantCultureIgnoreCase) && x.TeamId == teamId))
                            continue;

                        DbContext.User2Team.Add(new User2Team
                        {
                            Id = Guid.NewGuid(),
                            UserId = userId.ToString(),
                            TeamId = teamId
                        });
                    }
                }
            }
            //env-753 end

            return view;
        }

        public ViewModel LoadWithChildCollections(Guid? value, bool isReadOnly = true)
        {
            ViewModel result = (ViewModel)base.Load(value, isReadOnly);
            if (value.HasValue)
            {
                var users = DbContext.User2View.Where(x => x.ViewId == value.Value).ToList();
                result.UserId = users.Select(x => x.UserId).ToList();

                var teams = DbContext.Team2View.Where(t => t.ViewId == value.Value).ToList();
                result.TeamId = teams.Select(t => t.TeamId).ToList();
            }
            return result;
        }

        protected override View InitInstance()
        {
            return new View { Id = Guid.NewGuid() };
        }

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

        public override System.Data.Entity.DbSet<View> DataTable
        {
            get
            {
                return DbContext.Views;
            }
        }

        public IList<View> GetViewsByOwner(Guid? ownerId)
        {
            if (ownerId.HasValue)
            {
                return DataTable.Where(t => t.User2View.Select(x => x.UserId).Contains(ownerId.Value)).AsNoTracking().ToList();
            }

            return new List<View>();
        }

        public IList<Team> GetTeams(Guid? viewId)
        {
            if (!viewId.HasValue || Guid.Empty.Equals(viewId))
                return new List<Team>();
            var teams = (from tv in DbContext.Team2View
                         join t in DbContext.Teams on tv.TeamId equals t.Id
                         where tv.ViewId == viewId
                         orderby t.Name
                         select t).AsNoTracking().ToList();
            teams.ForEach(t => t.PeopleResources = t.PeopleResources.OrderBy(r => r.FirstName + r.LastName).ToList());

            return teams;
        }
    }
}