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 TeamManager : ManagerBase<Team, TeamModel>
    {
        public TeamManager(EnVisageEntities dbContext)
            : base(dbContext)
        {
        }

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

        protected override Team RetrieveReadOnlyById(Guid key)
        {
            var team = DataTable.AsNoTracking().FirstOrDefault(t => t.Id == key);
            team.PeopleResources = team.PeopleResources.OrderBy(r => r.LastName).ToList();
            return team;
        }

        public override DbSet<Team> DataTable
        {
            get
            {
                return DbContext.Teams;
            }
        }

        public TeamModel LoadWithChildCollections(Guid? value, bool isReadOnly = true)
        {
            TeamModel result = (TeamModel)base.Load(value, isReadOnly);
            
            return result;
        }

        public override Team Save(TeamModel model)
        {
            Team team = null;
            if (Guid.Empty.Equals(model.Id))
            {
                
                team = base.Save(model);

                var capScen = DbContext.Scenarios.Create();
                capScen.Type = (int)ScenarioType.TeamPlannedCapacity;
                capScen.Name = model.Name + " Planned Capacity";
                capScen.Id = Guid.NewGuid();
                team.PlannedCapacityScenarioId = capScen.Id;
                team.Id = Guid.NewGuid();
                DbContext.Scenarios.Add(capScen);
                DbContext.SaveChanges();
                if (model.UserId != null)
                {
                    foreach (var userId in model.UserId)
                    {
                        var user2Team = DbContext.User2Team.Create();
                        user2Team.Id = Guid.NewGuid();
                        user2Team.TeamId = team.Id;
                        user2Team.UserId = userId.ToString();
                        DbContext.User2Team.Add(user2Team);
                    }
                }
                if (model.ViewId != null)
                {
                    foreach (var itemId in model.ViewId)
                    {
                        var team2View = DbContext.Team2View.Create();
                        team2View.Id = Guid.NewGuid();
                        team2View.TeamId = team.Id;
                        team2View.ViewId = itemId;
                        DbContext.Team2View.Add(team2View);
            }
                }
            }
            else
            {
                team = base.Save(model);
                var projects = (from c in DbContext.Team2Project where c.TeamId == model.Id select c.ProjectId).Distinct().ToList();
                var users = DbContext.User2Team.Where(x => x.TeamId == model.Id).ToList();
                var users2remove = users.Where(x => model.UserId == null || !model.UserId.Contains(Guid.Parse(x.UserId))).Select(x => x.UserId).ToList();

                users.Where(x => model.UserId == null || !model.UserId.Contains(Guid.Parse(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(u => !c.ToString().Equals(u.UserId, StringComparison.InvariantCultureIgnoreCase))))
                    {
                        var user2Team = DbContext.User2Team.Create();
                        user2Team.Id = Guid.NewGuid();
                        user2Team.TeamId = team.Id;
                        user2Team.UserId = userId.ToString();
                        DbContext.Entry(user2Team).State = EntityState.Added;
                    }
                foreach (var project in projects)
                {
                    var projectUsers = (from c in DbContext.ProjectAccesses where c.ProjectId == project select c.PrincipalId).Distinct().ToList();
                    DbContext.ProjectAccesses.RemoveRange(DbContext.ProjectAccesses.Where(x => x.ProjectId == project && users2remove.Contains(x.PrincipalId.ToString())).ToList());
                    foreach (var userId in (from c in model.UserId where !projectUsers.Contains(c) select c).Distinct().ToList())
                    {
                        DbContext.ProjectAccesses.Add(new ProjectAccess()
                        {
                            PrincipalId = userId,
                            ProjectId = project,
                            Read = 1,
                            Write = 1
                        });
                    }
                }
                var existingViews = DbContext.Team2View.Where(x => x.TeamId == model.Id).ToList();
                existingViews.Where(x => model.ViewId == null || !model.ViewId.Contains(x.ViewId)).ToList().
                    ForEach(x => DbContext.Entry(x).State = EntityState.Deleted);
                if (model.ViewId != null)
                    foreach (var itemId in model.ViewId.Where(c => existingViews.All(u => !c.Equals(u.ViewId))))
                    {
                        var team2View = DbContext.Team2View.Create();
                        team2View.Id = Guid.NewGuid();
                        team2View.TeamId = team.Id;
                        team2View.ViewId = itemId;
                        DbContext.Entry(team2View).State = EntityState.Added;
                    }
            }
            
            return team;
        }

		public IList<Team> GetTeamsByUser(Guid? userId)
		{
			if (userId.HasValue)
			{
                var user2team = DbContext.User2Team.Where(t => t.UserId == userId.Value.ToString()).Select(t => t.TeamId).ToArray();
                var teams = DataTable.Where(t => user2team.Contains(t.Id)).AsNoTracking().ToList();
                teams.ForEach(t => t.PeopleResources = t.PeopleResources.OrderBy(r => r.LastName).ToList());
                return teams;
			}

			return new List<Team>();
		}
    }
}