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

namespace DepartmentDatabaseImplementation.Implementations
{
	/// <summary>
	/// Реализация IStudentGroupService
	/// </summary>
	public class StudentGroupService :
		AbstractGenerticEntityService<StudentGroupGetBindingModel, StudentGroupSetBindingModel, StudentGroup, StudentGroupListViewModel, StudentGroupViewModel>,
		IStudentGroupService
	{
		protected override OperationResultModel AdditionalCheckingWhenAdding(DbContext context, StudentGroupSetBindingModel model) => OperationResultModel.Success(null);

		protected override OperationResultModel AdditionalCheckingWhenDeleting(DbContext context, StudentGroup entity, StudentGroupGetBindingModel model)
		{
			if (context.Set<Student>().Any(x => x.StudentGroupId == model.Id && !x.IsDeleted))
			{
				return OperationResultModel.Error("Error:", "Есть студенты, относящиеся к этой группе", ResultServiceStatusCode.ExsistItem);
			}
			return OperationResultModel.Success(null);
		}

		protected override IQueryable<StudentGroup> AdditionalCheckingWhenReadingList(IQueryable<StudentGroup> query, StudentGroupGetBindingModel model)
		{
			if (model.EducationDirectionId.HasValue)
			{
				query = query.Where(x => x.EducationDirectionId == model.EducationDirectionId.Value);
			}
			if (model.LecturerId.HasValue)
			{
				query = query.Where(x => x.LecturerId == model.LecturerId.Value);
			}
			return query;
		}

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

		protected override void AdditionalDeleting(DbContext context, StudentGroup entity, StudentGroupGetBindingModel model)
		{
			var orders = context.Set<OrderStudentRecord>().Where(x => x.StudentGroupFromId == model.Id || x.StudentGroupToId == model.Id);
			foreach (var o in orders)
			{
				o.IsDeleted = true;
				o.DateDelete = DateTime.Now;
			}
			context.SaveChanges();
		}

		protected override StudentGroup GetUniqueEntity(StudentGroupSetBindingModel model, DbContext context) => context.Set<StudentGroup>().FirstOrDefault(x => x.EducationDirectionId == model.EducationDirectionId && x.AcademicCourse == (int)model.AcademicCourse && x.GroupNumber == model.GroupNumber && x.Id != model.Id);

		protected override IQueryable<StudentGroup> IncludingWhenReading(IQueryable<StudentGroup> query) => query.Include(x => x.EducationDirection).Include(x => x.Lecturer);

		protected override IQueryable<StudentGroup> OrderingWhenReading(IQueryable<StudentGroup> query) => query.OrderBy(x => x.EducationDirection.Cipher).ThenBy(x => x.AcademicCourse).ThenBy(x => x.GroupNumber);
	}
}