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

namespace StudentEnrollmentBusinessLogic
{
	public class StudentLogic : IStudentLogic
	{
		private readonly ILogger _logger;
		private readonly IStudentStorage _studentStorage;
		public StudentLogic(ILogger<StudentLogic> logger, IStudentStorage studentStorage)
		{
			_logger = logger;
			_studentStorage = studentStorage;
		}
		public List<StudentViewModel>? ReadList(StudentSearchModel? model)
		{
			_logger.LogInformation("ReadList. TIN: {TIN}. Id:{Id}", model?.tin, model?.student_id);
			var list = model == null ? _studentStorage.GetFullList() : _studentStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
			return list;
		}
		public StudentViewModel? ReadElement(StudentSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadList. TIN: {TIN}. Id:{Id}", model?.tin, model?.student_id);
			var element = _studentStorage.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(StudentBindingModel model)
		{
			CheckModel(model);
			if (_studentStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}
		public bool Update(StudentBindingModel model)
		{
			CheckModel(model);
			if (_studentStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}
		public bool Delete(StudentBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);
			if (_studentStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}
		private void CheckModel(StudentBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.LastName))
			{
				throw new ArgumentNullException("Нет фамилии студента!", nameof(model.LastName));
			}
            if (string.IsNullOrEmpty(model.FirstName))
            {
				throw new ArgumentNullException("Нет имени студента!", nameof(model.FirstName));
			}
            if (model.TIN == 0)
			{
				throw new ArgumentNullException("Нет ИНН студента!", nameof(model.TIN));
			}
			if (string.IsNullOrEmpty(model.Email))
			{
				throw new ArgumentNullException("Нет почты студента!", nameof(model.Email));
			}
			if (model.StudentCourse.Count == 0)
			{
				throw new ArgumentNullException("У студента должны быть баллы за экзамены!", nameof(model.StudentCourse));
			}
			_logger.LogInformation("Student. LastName: {LastName}, FirstName: {FirstName}, MiddleName: {MiddleName}, TIN: {TIN}, Email: {Email}, Id: {Id}", model.LastName, model.FirstName, model.MiddleName, model.TIN, model.Email, model.Id);
			var element = _studentStorage.GetElement(new StudentSearchModel
			{
				tin = model.TIN
			});
			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("Студент с таким ИНН уже есть");
			}
		}
	}
}