using DatabaseCore;
using DatabaseCore.Models.Department;
using DepartmentBusinessLogic.BindingModels;
using DepartmentBusinessLogic.Interfaces;
using DepartmentBusinessLogic.ViewModels;
using Microsoft.EntityFrameworkCore;
using ToolsModule.Enums;
using ToolsModule.Models;
using System;
using System.Linq;

namespace DepartmentDatabaseImplementation.Implementations
{
	/// <summary>
	/// Реализация ILecturerService
	/// </summary>
	public class LecturerService :
		AbstractGenerticEntityService<LecturerGetBindingModel, LecturerSetBindingModel, Lecturer, LecturerListViewModel, LecturerViewModel>,
		ILecturerService
	{
		protected override OperationResultModel AdditionalCheckingWhenAdding(DbContext context, LecturerSetBindingModel model) => OperationResultModel.Success(null);

		protected override OperationResultModel AdditionalCheckingWhenDeleting(DbContext context, Lecturer entity, LecturerGetBindingModel model)
		{
			if (entity.User == null)
			{
				return OperationResultModel.Error("Error:", "Не найден пользователь от сотрудника", ResultServiceStatusCode.NotFound);
			}
			if (context.Set<EducationDirection>().Any(x => x.LecturerId == model.Id && !x.IsDeleted))
			{
				return OperationResultModel.Error("Error:", "Есть направления обучения, у которых этот преподаватель указан руководителем", ResultServiceStatusCode.ExsistItem);
			}
			if (context.Set<StudentGroup>().Any(x => x.LecturerId == model.Id && !x.IsDeleted))
			{
				return OperationResultModel.Error("Error:", "Есть учебные группы, у которых этот преподаватель числится как куратор", ResultServiceStatusCode.ExsistItem);
			}
			return OperationResultModel.Success(null); ;
		}

		protected override IQueryable<Lecturer> AdditionalCheckingWhenReadingList(IQueryable<Lecturer> query, LecturerGetBindingModel model)
		{

			if (model.UserId.HasValue)
			{
				query = query.Where(x => x.UserId == model.UserId);
			}
			if (model.LecturerAcademicDegreeId.HasValue)
			{
				query = query.Where(x => x.LecturerAcademicDegreeId == model.LecturerAcademicDegreeId);
			}
			if (model.LecturerAcademicRankId.HasValue)
			{
				query = query.Where(x => x.LecturerAcademicRankId == model.LecturerAcademicRankId);
			}
			return query;
		}

		protected override OperationResultModel AdditionalCheckingWhenUpdateing(DbContext context, LecturerSetBindingModel model) => OperationResultModel.Success(null);

		protected override void AdditionalDeleting(DbContext context, Lecturer entity, LecturerGetBindingModel model)
		{
			entity.User.IsDeleted = true;
			entity.User.DateDelete = DateTime.Now;

			context.SaveChanges();

			var links = context.Set<LecturerPost>().Where(x => x.LecturerId == model.Id);
			foreach (var link in links)
			{
				link.IsDeleted = true;
				link.DateDelete = DateTime.Now;
			}
			context.SaveChanges();
		}

		protected override Lecturer GetUniqueEntity(LecturerSetBindingModel model, DbContext context) => context.Set<Lecturer>().FirstOrDefault(x => x.LastName == model.LastName && x.FirstName == model.FirstName &&
																														   x.Patronymic == model.Patronymic && x.Id != model.Id);

		protected override IQueryable<Lecturer> IncludingWhenReading(IQueryable<Lecturer> query)
		{
			return query
				.Include(x => x.LecturerAcademicRank)
				.Include(x => x.LecturerAcademicDegree)
				.Include(x => x.LecturerPosts).Include("LecturerPosts.Post");
		}

		protected override IQueryable<Lecturer> OrderingWhenReading(IQueryable<Lecturer> query) => query
			.OrderByDescending(x => x.LecturerPosts.Max(y => y.Post.Order))
			.ThenBy(x => x.LecturerAcademicRank.Order)
			.ThenBy(x => x.LecturerAcademicDegree.Order)
			.ThenBy(x => x.LastName)
			.ThenBy(x => x.FirstName);
	}
}