presence/Data/Repository/SQLGroupRepository.cs

using presence.Data.LocalData;
using presence.Data.LocalData.Entity;
using presence.Data.RemoteData.RemoteDatabase;
using presence.Data.RemoteData.RemoteDatabase.DAO;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace presence.Data.Repository
{
    public class SQLGroupRepositoryImpl : IGroupRepository
    {
        private readonly RemoteDatabaseContext _remoteDatabaseContext;

        public SQLGroupRepositoryImpl(RemoteDatabaseContext remoteDatabaseContext)
        {
            _remoteDatabaseContext = remoteDatabaseContext;
        }

        public List<GroupDao> GetAllGroups()
        {
            var groups = _remoteDatabaseContext.Groups
                .Select(g => new GroupDao
                {
                    ID = g.ID,
                    Name = g.Name
                })
                .ToList();
            return groups;
        }

        public bool AddGroup(string name, string id)
        {
            try
            {
                var groupDao = new GroupDao
                {
                    ID = int.Parse(id),
                    Name = name,
                    Users = new List<UserDao>()
                };
                _remoteDatabaseContext.Groups.Add(groupDao);
                _remoteDatabaseContext.SaveChanges();
                return true;
            }
            catch
            {
                return false;
            }
        }

        public List<GroupDao> GetAllGroup()
        {
            return GetAllGroups();
        }

        public GroupDao GetGroupById(int groupID)
        {
            var group = _remoteDatabaseContext.Groups
                .FirstOrDefault(x => x.ID == groupID);

            if (group == null) return null;

            return new GroupDao
            {
                ID = group.ID,
                Name = group.Name,
                Users = group.Users?.Select(u => new UserDao
                {
                    UserID = u.UserID,
                    UserFIO = u.UserFIO,
                    GroupID = group.ID
                }).ToList() ?? new List<UserDao>()
            };
        }

        public bool RemoveGroupById(int groupID)
        {
            try
            {
                var group = _remoteDatabaseContext.Groups
                    .FirstOrDefault(x => x.ID == groupID);
                if (group == null) return false;

                if (group.Users != null && group.Users.Any())
                {
                    return false;
                }

                _remoteDatabaseContext.Groups.Remove(group);
                _remoteDatabaseContext.SaveChanges();
                return true;
            }
            catch
            {
                return false;
            }
        }

        public bool UpdateGroupById(int groupID, string name)
        {
            try
            {
                var group = _remoteDatabaseContext.Groups
                    .FirstOrDefault(x => x.ID == groupID);
                if (group == null) return false;

                group.Name = name;
                _remoteDatabaseContext.SaveChanges();
                return true;
            }
            catch
            {
                return false;
            }
        }
    }
}