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

namespace StudentEnrollmentBusinessLogic
{
	public class FacultyLogic : IFacultyLogic
	{
		private readonly IFacultyStorage _facultyStorage;
		private readonly ILogger _logger;

		public FacultyLogic(IFacultyStorage facultyStorage, ILogger<FacultyLogic> logger)
		{
			_facultyStorage = facultyStorage;
			_logger = logger;
		}
		public List<FacultyViewModel>? ReadList(FacultySearchModel? model)
		{
			_logger.LogInformation("ReadList. FacultyName:{FacultyName}.Id:{ Id}", model?.name, model?.faculty_id);
			var list = model == null ? _facultyStorage.GetFullList() :
			_facultyStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
			return list;
		}
		public FacultyViewModel? ReadElement(FacultySearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. FacultyName:{FacultyName}.Id:{ Id}", model.name, model.faculty_id);
			var element = _facultyStorage.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(FacultyBindingModel model)
		{
			CheckModel(model);
			if (_facultyStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}
		public bool Update(FacultyBindingModel model)
		{
			CheckModel(model);
			if (_facultyStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}

		public bool Delete(FacultyBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);
			if (_facultyStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}

		private void CheckModel(FacultyBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.FacultyName))
			{
				throw new ArgumentNullException("Нет названия факультета!",
			   nameof(model.FacultyName));
			}
			_logger.LogInformation("Faculty. FacultyName:{FacultyName}. Id: { Id}", model.FacultyName, model.Id);
			var element = _facultyStorage.GetElement(new FacultySearchModel
			{
				name = model.FacultyName,
			}); ;
			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("Факультет с таким же названием уже есть");
			}
		}
	}
}