SUBD_SchoolSchedule/SchoolSchedule/SchoolScheduleBusinessLogic/LessonLogic.cs

using SchoolScheduleContracts.BindingModels;
using SchoolScheduleContracts.BusinessLogicsContracts;
using SchoolScheduleContracts.SearchModels;
using SchoolScheduleContracts.StoragesContracts;
using SchoolScheduleContracts.ViewModels;
using SchoolScheduleDataModels.Enums;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SchoolScheduleBusinessLogic
{
	public class LessonLogic : ILessonLogic
	{
		private readonly ILessonStorage _lessonStorage;
		private readonly ISubjectStorage _subjectStorage;
		private readonly ITeacherStorage _teacherStorage;
		private readonly IGradeStorage _gradeStorage;
		private readonly IStudentStorage _studentStorage;
		public LessonLogic(ILessonStorage lessonStorage, ISubjectStorage subjectStorage, ITeacherStorage teacherStorage, IGradeStorage gradeStorage, IStudentStorage studentStorage)
		{
			_lessonStorage = lessonStorage;
			_subjectStorage = subjectStorage;
			_teacherStorage = teacherStorage;
			_gradeStorage = gradeStorage;
			_studentStorage = studentStorage;
		}

		public List<LessonViewModel> ReadList(LessonSearchModel? model)
		{
			var list = model == null ? _lessonStorage.GetFullList() :
_lessonStorage.GetFilteredList(model);
			return list;
		}

		public LessonViewModel? ReadElement(LessonSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			var element = _lessonStorage.GetElement(model);
			return element;
		}

		public List<StudentViewModel> GetStudents(LessonSearchModel model)
		{
			var list = _studentStorage.GetFilteredList(new StudentSearchModel { GradeId = model.GradeId });
			return list;
		}

		public bool Create(LessonBindingModel model)
		{
			CheckModel(model);
			if (_lessonStorage.Insert(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Update(LessonBindingModel model)
		{
			CheckModel(model);
			if (_lessonStorage.Update(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Delete(LessonBindingModel model)
		{
			CheckModel(model, false);
			if (_lessonStorage.Delete(model) == null)
			{
				return false;
			}
			return true;
		}

		private void CheckModel(LessonBindingModel model, bool withParams =
	   true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}

			var element1 = _lessonStorage.GetElement(new LessonSearchModel
			{
				Date = model.Date,
				SchedulePlaceId = model.SchedulePlaceId,
				TeacherId = model.TeacherId
			});
			var element2 = _lessonStorage.GetElement(new LessonSearchModel
			{
				Date = model.Date,
				SchedulePlaceId = model.SchedulePlaceId,
				GradeId = model.GradeId
			});

			if (element1 != null)
			{
				throw new InvalidOperationException("У учителя уже есть урок в это время");

			}

			if (element2 != null)
			{
				throw new InvalidOperationException("У класса уже есть урок в это время");

			}
		}
	}
}