using System;
using System.Collections.Generic;
using System.Linq;
using Thermo.Active.Model.DatabaseModels;

namespace Thermo.Active.Database.Controllers
{
    public class SessionsController : IDisposable
    {
        private DatabaseContext dbCtx;

        public SessionsController()
        {
            // Initialize database context
            dbCtx = new DatabaseContext();
        }

        public void Dispose()
        {
            // Clear database context
            dbCtx.Dispose();
        }

        public SessionModel FindSessionByToken(string token)
        {
            return dbCtx
                .Sessions
                .Include("MachineUser")
                .Where(x => x.Token == token) // Find session by token
                .FirstOrDefault();
        }

        public List<MachineUserModel> FindMachineUserSession()
        {
            return dbCtx
                .Sessions
                .Include("MachineUser")
                .Select(x => x.MachineUser)
                .GroupBy(x => x.MachineUserId)
                .Select(x => x.FirstOrDefault())
                .ToList();
        }

        public void DeleteUserSessions(int machineUserId)
        {
            dbCtx
                .Sessions
                .RemoveRange( // Delete rows
                    dbCtx
                    .Sessions
                    .Where(x => x.MachineUserId == machineUserId) // Find all the session with matching machineUserId
                );
            // Commit changes
            dbCtx.SaveChanges();
        }

        public void DeleteSessionsByUserAndMachineId(int machineId, int userId)
        {
            MachineUserModel machineUser = null;
            using (MachinesUsersController machinesUsersController = new MachinesUsersController())
            {
                // Find machine_user id
                machineUser = machinesUsersController.FindByUserId(machineId, userId);
            }

            DeleteUserSessions(machineUser.MachineUserId);
        }

        public void Create(int machineUserId, string token)
        {
            // Create session model
            SessionModel session = new SessionModel()
            {
                MachineUserId = machineUserId,
                Token = token,
                FirstLogin = DateTime.Now
            };
            // Add to database
            dbCtx.Sessions.Add(session);
            // Commit changes
            dbCtx.SaveChanges();
        }
    }
}