using HotelContracts.BindingModels;
using HotelContracts.BusinessLogicsContracts;
using HotelContracts.SearchModels;
using HotelContracts.StoragesContracts;
using HotelContracts.ViewModels;
using HotelDataModels.Models;
using Microsoft.Extensions.Logging;

namespace HotelBusinessLogic.BusinessLogic
{
	public class MealPlanLogic : IMealPlanLogic
	{
		private readonly ILogger _logger;
		private readonly IMealPlanStorage _mealPlanStorage;

		public MealPlanLogic (ILogger<MealPlanLogic> logger, IMealPlanStorage mealPlanStorage)
		{
			_logger = logger;
			_mealPlanStorage = mealPlanStorage;
		}

		public List<MealPlanViewModel>? ReadList(MealPlanSearchModel? model)
		{
			_logger.LogInformation("ReadList. MealPlanName:{MealPlanName}.Id:{ Id}", model?.MealPlanName, model?.Id);

			var list = model == null ? _mealPlanStorage.GetFullList() : _mealPlanStorage.GetFilteredList(model);

			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}

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

		public MealPlanViewModel? ReadElement(MealPlanSearchModel? model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("ReadList. MealPlanName:{MealPlanName}.Id:{ Id}", model?.MealPlanName, model?.Id);

			var element = _mealPlanStorage.GetElement(model);

			if (element == null)
			{
				_logger.LogInformation("ReadElement element not found");
				return null;
			}

			_logger.LogInformation("ReadElement find: Id:{Id}", model.Id);

			return element;
		}

		public bool Create(MealPlanBindingModel model)
		{
			CheckModel(model);
			model.MealPlanParticipants = new();

			if (_mealPlanStorage.Insert == null)
			{
				_logger.LogWarning("Insert error");
				return false;
			}

			return true;
		}

		public bool Update(MealPlanBindingModel model)
		{
			CheckModel(model);

			if (_mealPlanStorage.Update == null)
			{
				_logger.LogWarning("Update error");
				return false;
			}

			return true;
		}

		public bool Delete(MealPlanBindingModel model)
		{
			CheckModel(model, false);

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

			if (_mealPlanStorage.Delete == null)
			{
				_logger.LogWarning("Delete error");
				return false;
			}

			return true;
		}

		public bool AddParticipantToMealPlan(MealPlanSearchModel model, IParticipantModel participant)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("AddMemberToMealPlan. MealPlanName:{MealPlanName}.Id:{ Id}", model.MealPlanName, model.Id);

			var element = _mealPlanStorage.GetElement(model);

			if (element == null)
			{
				_logger.LogWarning("AddMemberToMealPlan element not found");
				return false;
			}

			_logger.LogInformation("AddMemberToMealPlan find. Id:{Id}", element.Id);

			element.MealPlanParticipants[participant.Id] = participant;

			_mealPlanStorage.Update(new()
			{
				Id = element.Id,
				MealPlanName = element.MealPlanName,
				MealPlanPrice = element.MealPlanPrice,
				OrganiserId = element.OrganiserId,
				MealPlanParticipants = element.MealPlanParticipants
			});

			return true;
		}

		public void CheckModel(MealPlanBindingModel model, bool withParams = true) 
		{ 
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			if (!withParams)
			{
				return;
			}

			if (string.IsNullOrEmpty(model.MealPlanName))
			{
				throw new ArgumentNullException("Нет названия плана питания", nameof(model.MealPlanName));
			}

			if (model.MealPlanPrice < 0)
			{
				throw new ArgumentNullException("Стоимость плана питания не может быть меньше 0", nameof(model.MealPlanPrice));
			}

			_logger.LogInformation("MealPlan. MealPlanName:{MealPlanName}.MealPlanPrice:{ MealPlanPrice}. Id: { Id}", model.MealPlanName, model.MealPlanPrice, model.Id);

			var element = _mealPlanStorage.GetElement(new MealPlanSearchModel
			{
				MealPlanName = model.MealPlanName,
			});

			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("План питания с таким названием уже есть");
			}
		}
	}
}