using Microsoft.Extensions.Logging;
using StudentEnrollmentContracts.BindingModels;
using StudentEnrollmentContracts.BusinessLogicContracts;
using StudentEnrollmentContracts.SearchModels;
using StudentEnrollmentContracts.StorageContracts;
using StudentEnrollmentContracts.ViewModels;
using StudentEnrollmentDataModels.Models;

namespace StudentEnrollmentBusinessLogic
{
	public class ExamPointsLogic : IExamPointsLogic
	{
		private readonly ILogger _logger;
		private readonly IExamPointsStorage _examPointsStorage;
		public ExamPointsLogic(ILogger<ExamPointsLogic> logger, IExamPointsStorage
	   examPointsStorage)
		{
			_logger = logger;
			_examPointsStorage = examPointsStorage;
		}
		public List<ExamPointsViewModel>? ReadList(ExamPointsSearchModel? model)
		{
			_logger.LogInformation("ReadList. Id:{ Id}", model?.exampoints_id);
			var list = model == null ? _examPointsStorage.GetFullList() :
			_examPointsStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
			return list;
		}
		public ExamPointsViewModel? ReadElement(ExamPointsSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement .Id:{ Id}", model.exampoints_id);
			var element = _examPointsStorage.GetElement(model);
			if (element == null)
			{
				_logger.LogWarning("ReadElement element not found");
				return null;
			}
			_logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
			return element;
		}
		public bool Create(ExamPointsBindingModel model)
		{
			CheckModel(model);
			if (_examPointsStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}

		public IExamPointsModel Create(ExamPointsBindingModel model, bool returnTypeIsModel)
		{
            if (returnTypeIsModel)
            {
				CheckModel(model);
				if (_examPointsStorage.Insert(model) == null)
				{
					_logger.LogWarning("Insert operation failed");
					return null;
				}
				var list = _examPointsStorage.GetFullList();
				return list[list.Count - 1];
			}
			return null;
		}
		public bool Update(ExamPointsBindingModel model)
		{
			CheckModel(model);
			if (_examPointsStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}
		public bool Delete(ExamPointsBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);
			if (_examPointsStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}
		private void CheckModel(ExamPointsBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (model.FirstExamPoints == 0)
			{
				throw new ArgumentNullException("Нет баллов за первый экзамен",
			   nameof(model.FirstExamPoints));
			}
			if (model.SecondExamPoints == 0)
			{
				throw new ArgumentNullException("Нет баллов за второй экзамен",
			   nameof(model.SecondExamPoints));
			}
			if (model.ThirdExamPoints == 0)
			{
				throw new ArgumentNullException("Нет баллов за третий экзамен",
			   nameof(model.ThirdExamPoints));
			}
			_logger.LogInformation("ExamPoints. FirstExamPoints: {FirstExamPoints}. " +
				"SecondExamPoints: {SecondExamPoints}. ThirdExamPoints: {ThirdExamPoints}. AddPoints: {AddPoints}. Summary: {Summary}" +
				"Id: { Id}", 
				model.FirstExamPoints, model.SecondExamPoints, model.ThirdExamPoints, 
				model.AddPoints, model.Summary, model.Id);
		}
	}
}