using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Diplom_O.DataBase
{
	public class User
	{
		[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
		public int Id { get; set; }
		public string Login { get; set; }
		public string Pass { get; set; }
		public bool Hide { get; set; }
		public int Default { get; set; }
		public List<Access> Accessy { get; set; }
	}

	public static partial class FuncDB
	{
		public static void UserCheckValid(User obj)
		{
			try
			{
				if (obj == null) throw new Exception("Ошибка инициализации.");
				if (string.IsNullOrEmpty(obj.Login)) throw new Exception("Логин не указан.");
				if (string.IsNullOrEmpty(obj.Pass)) throw new Exception("Пароль не указан.");
				if (obj.Default < 0 || obj.Default > 7) throw new Exception("Форма не существует.");
			}
			catch { throw; }
		}
		public static User UserGetById(int id)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.Usery
						where a.Id == id
						select a;
					try
					{
						return res.Single();
					}
					catch
					{
						return null;
					}
				}
			}
			catch
			{
				throw;
			}
		}
		public static User UserGetByLogin(string login)
    {
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.Usery
						where a.Login == login
						select a;
					try
					{
						return res.Single();
					}
					catch
					{
						return null;
					}
				}
			}
			catch
			{
				throw;
			}

		}
		public static void UserAdd(User obj)
		{
			try
			{
				UserCheckValid(obj);
				if (UserGetByLogin(obj.Login) != null)
					throw new Exception("Пользователь существует.");
				using (var db = new MainDB())
				{
					db.Usery.Add(obj);
					db.SaveChanges();
				}
				var user = UserGetByLogin(obj.Login);
				for (var i = 0; i < FormArray.formAccess.Length; i++)
				{
					var access = new Access()
					{
						UserId = user.Id,
						FormId = user.Default,
						FormatAccess = i
					};
					AccessAdd(access);
				}
			}
			catch
			{
				throw;
			}
		}
		public static void UserChange(User obj)
		{
			try
			{
				UserCheckValid(obj);
				var localObj = UserGetById(obj.Id);
				if (localObj == null)
					throw new Exception("Пользователь не указан.");
				var localObjByLogin = UserGetByLogin(obj.Login);
				if (localObjByLogin != null &&
					localObjByLogin.Id != localObj.Id)
					throw new Exception("Логин существует.");
				if (AccessGetByUserIdFormIdAccessId(localObj.Id, obj.Default, 0)  == null)
					throw new Exception("Сначала нужен доступ к форме.");
				using (var db = new MainDB())
				{
					db.Usery.Update(obj);
					db.SaveChanges();
				}
			}
			catch
			{
				throw;
			}
		}
		public static void UserDelete(User obj)
		{
			try
			{
				if (obj == null)
					return;
				var localObj = UserGetById(obj.Id);
				if (localObj == null)
					throw new Exception("Пользователь не существует.");
				var acessy = AccessList(localObj.Id);
				foreach (var a in acessy)
					AccessDelete(a);
				using (var db = new MainDB())
				{
					db.Usery.Remove(localObj);
					db.SaveChanges();
				}
			}
			catch
			{
				throw;
			}
		}

		public static User[] UserList(bool showHide = false)
		{
			try
			{
				using (var db = new MainDB())
				{
					var user = (
						from a in db.Usery
						where (showHide || !a.Hide)
						select a
						).ToArray();
					return user;
				}
			}
			catch
			{
				throw;
			}
		}
		public static string[][] UserListTable(bool showHide = false)
    {
			try
			{
				using (var db = new MainDB())
				{
					var list = UserList(showHide);
					var subres = new List<string[]>();
					foreach (var r in list)
					{
						subres.Add(
							new string[]{
								r.Login
						});
					}
					return subres.ToArray();
				}
			}
			catch
			{
				throw;
			}

		}
	}
}