using DinerContracts.BindingModels;
using DinerContracts.BusinessLogicsContracts;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata.Ecma335;
using System.Text;
using System.Threading.Tasks;

namespace DineryBusinessLogic.BusinessLogic {
	public class ImplementerLogic : IImplementerLogic {

		private readonly ILogger _logger;
		private readonly IImplementerStorage _storage;

		public ImplementerLogic(ILogger<ImplementerLogic> logger, IImplementerStorage storage) {
			_logger = logger;
			_storage = storage;
		}

		public bool Create(ImplementerBindingModel model) {
			CheckModel(model);
			if (_storage.Insert(model) == null) {
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}

		public bool Delete(ImplementerBindingModel model) {
			CheckModel(model, false);
			_logger.LogInformation($"Delete. ID:{model.ID}");
			if (_storage.Delete(model) == null) {
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return false;
		}

		public bool Update(ImplementerBindingModel model) {
			CheckModel(model);
			if (_storage.Update(model) == null) {
				_logger.LogWarning("Update operation failde");
				return false;
			}
			return true;
		}

		public ImplementerViewModel? ReadElement(ImplementerSearchModel model) {
			if (model == null) {
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation($"ReadElement. FIO:{model.ImplementerFIO}.ID:{model.ID}");
			var element = _storage.GetElement(model);
			if (element == null) {
				_logger.LogWarning("ReadElement. element not fount");
				return null;
			}
			_logger.LogInformation($"ReadElement. find.ID:{element.ID}");
			return element;
		}

		public List<ImplementerViewModel>? ReadList(ImplementerSearchModel? model) {
			_logger.LogInformation($"ReadList. ImplementerID:{model?.ID}");
			var list = model == null ? _storage.GetFullList() : _storage.GetFilteredList(model);
			if (list == null) {
				_logger.LogWarning("ReadList. return null list");
				return null;
			}
			_logger.LogInformation($"ReadList. Count:{list.Count}");
			return list;
		}


		private void CheckModel(ImplementerBindingModel model, bool withParams = true) {
			if (model == null) {
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams) {
				return;
			}
			if (string.IsNullOrEmpty(model.ImplementerFIO)) {
				throw new ArgumentNullException("Нет ФИО исполнителя", nameof(model.ImplementerFIO));
			}
			if (string.IsNullOrEmpty(model.Password)) {
				throw new ArgumentNullException("Нет пароля");
			}
			if (string.IsNullOrEmpty((model.WorkExperience).ToString())) {
				throw new ArgumentNullException("Не указан стаж");
			}
			if (string.IsNullOrEmpty((model.Qualification).ToString())) {
				throw new ArgumentNullException("Нет квалификации");
			}
			if (string.IsNullOrEmpty((model.ID).ToString())) {
				throw new ArgumentNullException("Нет ID пользователя", nameof(model.ID));
			}
			_logger.LogInformation($"Implementer. ID:{model.ID}.ImplementerFIO:{model.ImplementerFIO}.WorkExperience:{model.WorkExperience}." +
									$"Qualification:{model.Qualification}");
			var element = _storage.GetElement(new ImplementerSearchModel {
				ImplementerFIO = model.ImplementerFIO
			});
			if (element != null && element.ImplementerFIO == model.ImplementerFIO) {
				throw new InvalidOperationException("Исполнитель с таким ФИО уже есть");
			}
		}
	}
}