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 Access
	{
		[Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
		public int Id { get; set; }
		[ForeignKey("User")]
		public int UserId { get; set; }
		public User User { get; set; }
		public int FormId { get; set; }
		public int FormatAccess { get; set; }
	}

	public static partial class FuncDB
	{
		public static void AccessCheckValid(Access obj)
		{
			try
			{
				if (obj == null) throw new Exception("Ошибка инициализации.");
				if (UserGetById(obj.UserId) == null) throw new Exception("Пользователь не указан.");
				if (obj.FormId < 0 || obj.FormId >= FormArray.formName.Length) throw new Exception("Неверно указана форма.");
				if (obj.FormId < 0 || obj.FormatAccess >= FormArray.formAccess.Length) throw new Exception("Неверно указаны разрешения");
			}
			catch { throw; }
		}

		public static Access AccessGetById(int id)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.Accessy
						where a.Id == id
						select a;
					try
					{
						return res.Single();
					}
					catch
					{
						return null;
					}
				}
			}
			catch
			{
				throw;
			}
		}
		public static Access[] AccessGetByUserIdFormId(int UserId, int FormId)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.Accessy
						where a.UserId == UserId && a.FormId == FormId
						select a;
					try
					{
						return res.ToArray();
					}
					catch
					{
						throw;
					}
				}
			}
			catch
			{
				throw;
			}
		}
		public static Access AccessGetByUserIdFormIdAccessId(int UserId, int FormId, int AccessId)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.Accessy
						where
							a.UserId == UserId &&
							a.FormId == FormId &&
							a.FormatAccess == AccessId
						select a;
					try
					{
						return res.Single();
					}
					catch
					{
						return null;
					}
				}
			}
			catch
			{
				throw;
			}
		}

		public static void AccessAdd(Access obj)
		{
			try
			{
				AccessCheckValid(obj);
				var local_obj = AccessGetByUserIdFormIdAccessId(obj.UserId, obj.FormId, obj.FormatAccess);
				if (local_obj == null)
					using (var db = new MainDB())
					{
						db.Accessy.Add(obj);
						db.SaveChanges();
					}
			}
			catch
			{
				throw;
			}
		}
		public static void AccessDelete(Access obj)
		{
			try
			{
				if (obj == null)
					return;
				var localObj = AccessGetById(obj.Id);
				if (localObj == null)
					throw new Exception("Разрешение не существует.");
				using (var db = new MainDB())
				{
					db.Accessy.Remove(localObj);
					db.SaveChanges();
				}
			}
			catch
			{
				throw;
			}
		}

		public static Access[] AccessList(int UserId)
		{
			try
			{
				using (var db = new MainDB())
				{
					var access = (
						from a in db.Accessy
						where a.UserId == UserId
						orderby a.FormId
						orderby a.FormatAccess
						select a
						).ToArray();
					return access;
				}
			}
			catch
			{
				throw;
			}
		}
		public static bool[,] AccessListTable(int UserId)
    {
			try
			{
				var result = new bool[FormArray.formName.Length, FormArray.formAccess.Length];
				using (var db = new MainDB())
				{
					var list = AccessList(UserId);
					foreach (var r in list)
						result[r.FormId, r.FormatAccess] = true;
					return result;
				}
			}
			catch
			{
				throw;
			}
		}

		public static int AccessToSettingsFullCountWithoutUserId(User user)
    {
			try
			{
				using (var db = new MainDB())
				{
					var users =
						(from a in db.Usery
						 where a.Id != user.Id
						 select a).ToArray();
					var count = 0;
					foreach(var usr in users)
          {
						var access =
							from a in db.Accessy
							where
								a.UserId == usr.Id &&
								a.FormId == 7
							select a;
						if (access.Count() == FormArray.formAccess.Length)
							count++;
          }
					return count;
				}
			}
			catch
			{
				throw;
			}
		}
	}
}