using System;
using System.Collections.Generic;
using System.Linq;
using Thermo.Active.Model.DatabaseModels;
using Thermo.Active.Model.DTOModels;
using static Thermo.Active.Model.Constants;

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

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

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

        public MachineUserModel FindByUserId(int machineId, int userId)
        {
            return dbCtx
                .MachinesUsers
                .Include("Role") // TODO Add machine and user info?
                .Where(x => x.MachineId == machineId && x.UserId == userId)
                .FirstOrDefault();
        }

        public MachineUserModel FindByIdWithData(int id)
        {
            return dbCtx
                .MachinesUsers
                .Include("Role") // Join with Role, Machine, User
                .Include("Machine")
                .Include("User")
                .Where(x => x.MachineUserId == id)
                .FirstOrDefault();
        }

        public MachineUserModel Create(int machineId, int userId, int roleId)
        {
            // Create database model
            MachineUserModel machine = new MachineUserModel()
            {
                MachineId = machineId,
                UserId = userId,
                RoleId = roleId
            };
            // Add into database
            dbCtx.MachinesUsers.Add(
                machine
            );
            // Commit changes
            dbCtx.SaveChanges();

            return machine;
        }

        public DTORoleModel GetUserRoleData(int machineId, int userId)
        {
            var machineUser = dbCtx
                .MachinesUsers
                .Include("Role")
                .Where(x => x.MachineId == machineId && x.UserId == userId) // Find by machine id and user id, joining with role
                .FirstOrDefault();

            if (machineUser != null)
            {
                RoleModel role = machineUser.Role;
                return new DTORoleModel()
                {
                    Id = role.RoleId,
                    Name = role.Name,
                    Level = role.Level
                };
            }

            return null;
        }

        public bool UserIsCmsAdmin(int machineId, int userId)
        {
            MachineUserModel user = FindByUserId(machineId, userId);
            if (user.Role.RoleId == (int)ROLE_IDS.CMS_SERVICE || user.Role.RoleId == (int)ROLE_IDS.CMS_UT)
                return true;

            return false;
        }

        public bool RoleIsAdminOrHigher(int roleId)
        {
            var tmpRole = dbCtx.Roles
                .ToList()
                .First(X => X.RoleId == roleId);

            if (tmpRole == null)
                return false;
            else
                return tmpRole.Level >= MIN_ADMIN_ROLE;
        }

        public int CompareUsersRole(int firstUserId, int secondUserId, int machineId)
        {
            MachineUserModel firstUser = FindByUserId(machineId, firstUserId);
            MachineUserModel secondUser = FindByUserId(machineId, secondUserId);

            if (firstUser.Role.Level == secondUser.Role.Level)
                return 0;
            else if (firstUser.Role.Level > secondUser.Role.Level)
                return 1;
            else
                return -1;
        }

        public List<DTORoleModel> GetRolesList()
        {
            return dbCtx
                .Roles.Where(X => X.Level < MIN_CMS_ROLE)
                .Select(x => new DTORoleModel()
                {
                    Id = x.RoleId,
                    Name = x.Name
                })
                .ToList();
        }

        public void UpdateUserRole(int machineId, int userId, int roleId)
        {
            MachineUserModel machineUser = FindByUserId(machineId, userId);
            if (machineUser == null)
                return;

            machineUser.RoleId = roleId;

            dbCtx.SaveChanges();
        }

        public RoleModel GetUserRole(int machineId, int userId)
        {
            var machine = FindByUserId(machineId, userId);
            if (machine != null)
                return machine.Role;

            return null;
        }
    }
}