using HospitalContracts.BindingModels;
using HospitalContracts.BusinessLogicsContracts;
using HospitalContracts.SearchModels;
using HospitalContracts.StoragesContracts;
using HospitalContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HospitalBusinessLogics.BusinessLogics
{
	/// <summary>
	/// Бизнес-логика для сущности "Болезнь"
	/// </summary>
	public class DiseaseLogic : IDiseaseLogic
	{
		/// <summary>
		/// Логгер
		/// </summary>
		private readonly ILogger _logger;

		/// <summary>
		/// Хранилище
		/// </summary>
		private readonly IDiseaseStorage _diseaseStorage;

		/// <summary>
		/// Конструктор
		/// </summary>
		/// <param name="logger"></param>
		/// <param name="diseaseStorage"></param>
		public DiseaseLogic(ILogger<DiseaseLogic> logger, IDiseaseStorage diseaseStorage)
		{
			_logger = logger;
			_diseaseStorage = diseaseStorage;
		}

		/// <summary>
		/// Получить список
		/// </summary>
		/// <param name="model"></param>
		/// <returns></returns>
		public List<DiseaseViewModel>? ReadList(DiseaseSearchModel? model)
		{
			_logger.LogInformation("ReadList. Disease.Id: {Id}. RecipeId: {RecipeId}. Name: {Name}", model?.Id, model?.RecipeId, model?.Name);

			var list = model == null ? _diseaseStorage.GetFullList() : _diseaseStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList. Returned null list");
				return null;
			}

			_logger.LogInformation("ReadList. Count: {Count}", list.Count);
			return list;
		}

		/// <summary>
		/// Получить отдельную запись
		/// </summary>
		/// <param name="model"></param>
		/// <returns></returns>
		/// <exception cref="ArgumentNullException"></exception>
		public DiseaseViewModel? ReadElement(DiseaseSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("ReadElement. Disease.Id: {Id}. Name: {Name}", model?.Id, model?.Name);

			var element = _diseaseStorage.GetElement(model!);
			if (element == null)
			{
				_logger.LogWarning("ReadElement. Element not found");
				return null;
			}

			_logger.LogInformation("ReadElement. Find Disease.Id: {Id}", element?.Id);
			return element;
		}

		/// <summary>
		/// Создать запись
		/// </summary>
		/// <param name="model"></param>
		/// <returns></returns>
		public bool Create(DiseaseBindingModel model)
		{
			CheckModel(model);
			_logger.LogInformation("Create. Disease.Id: {Id}", model.Id);

			if (_diseaseStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}

		/// <summary>
		/// Изменить запись
		/// </summary>
		/// <param name="model"></param>
		/// <returns></returns>
		public bool Update(DiseaseBindingModel model)
		{
			CheckModel(model);
			_logger.LogInformation("Update. Disease.Id: {Id}", model.Id);

			if (_diseaseStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}

		/// <summary>
		/// Удалить запись
		/// </summary>
		/// <param name="model"></param>
		/// <returns></returns>
		public bool Delete(DiseaseBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Disease.Id: {Id}", model.Id);

			if (_diseaseStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}

		/// <summary>
		/// Проверка модели
		/// </summary>
		/// <param name="model"></param>
		/// <param name="withParams"></param>
		/// <exception cref="ArgumentNullException"></exception>
		/// <exception cref="InvalidOperationException"></exception>
		private void CheckModel(DiseaseBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.Name))
			{
				throw new ArgumentNullException("Не указано название болезни", nameof(model.Name));
			}
			if (model.RecipeId <= 0)
			{
				throw new ArgumentNullException("Не указан идентификатор рецепта", nameof(model.RecipeId));
			}

			_logger.LogInformation("CheckModel. Disease.Id: {Id}", model.Id);

			var element = _diseaseStorage.GetElement(new DiseaseSearchModel
			{
				Name = model.Name
			});
			if (element != null && !element.Id.Equals(model.Id))
			{
				throw new InvalidOperationException("Болезнь с таким названием уже существует");
			}
		}
	}
}