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

namespace LawFirmBusinessLogic.BusinessLogics
{
    public class ShopLogic : IShopLogic
    {
        private readonly ILogger _logger;
        private readonly IShopStorage _shopStorage;
        public ShopLogic(ILogger<ShopLogic> logger, IShopStorage shopStorage)
        {
            _logger = logger;
            _shopStorage = shopStorage;
        }
        public List<ShopViewModel>? ReadList(ShopSearchModel? model)
        {
            _logger.LogInformation("ReadList. ShopName: {ShopName}. Id: {Id}", model?.ShopName, model?.Id);
            var list = model == null ? _shopStorage.GetFullList() : _shopStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }
        public ShopViewModel? ReadElement(ShopSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. ShopName: {ShopName}. Id: {Id}", model.ShopName, model.Id);
            var element = _shopStorage.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(ShopBindingModel model)
        {
            CheckModel(model);
            if (_shopStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(ShopBindingModel model)
        {
            CheckModel(model);
            if (_shopStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(ShopBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id: {Id}", model.Id);
            if (_shopStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        private void CheckModel(ShopBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.ShopName))
            {
                throw new ArgumentNullException("Нет названия магазина", nameof(model.ShopName));
            }
            _logger.LogInformation("Shop. ShopName:{0}. Address:{1}. Id:{2}",
                model.ShopName, model.Address, model.Id);
            var element = _shopStorage.GetElement(new ShopSearchModel
            {
                ShopName = model.ShopName
            });
            if (element != null && element.Id != model.Id && element.ShopName == model.ShopName)
            {
                throw new InvalidOperationException("Магазин с таким названием уже есть");
            }
        }

        public bool AddDocument(ShopSearchModel model, IDocumentModel document, int count)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (count <= 0)
            {
                return false;
                throw new ArgumentException("Количество документов должно быть больше 0", nameof(count));
            }
            _logger.LogInformation("AddDocument. ShopName:{ShopName}. Id:{Id}", model.ShopName, model.Id);
            var element = _shopStorage.GetElement(model);
            if (element == null)
            {
                _logger.LogWarning("AddDocument element not found");
                return false;
            }
			if (element.Capacity - element.ShopDocuments.Select(x => x.Value.Item2).Sum() < count)
			{
				throw new ArgumentNullException("В магазине не хватает места", nameof(count));
			}

			if (element.ShopDocuments.TryGetValue(document.Id, out var pair))
            {
                element.ShopDocuments[document.Id] = (document, count + pair.Item2);
                _logger.LogInformation("AddDocument. Added {count} {document} to '{ShopName}' shop",
                    count, document.DocumentName, element.ShopName);
            }
            else
            {
                element.ShopDocuments[document.Id] = (document, count);
                _logger.LogInformation("AddDocument. Added {count} new document {document} to '{ShopName}' shop",
                    count, document.DocumentName, element.ShopName);
            }
            _shopStorage.Update(new()
            {
                Id = element.Id,
                Address = element.Address,
                ShopName = element.ShopName,
                DateOpen = element.DateOpen,
                Capacity = element.Capacity,
                ShopDocuments = element.ShopDocuments
            });
            return true;
        }
		public bool AddDocuments(IDocumentModel model, int count)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (count <= 0)
			{
				throw new ArgumentException("Количество документов должно быть больше 0", nameof(count));
			}
			_logger.LogInformation("AddDocuments. ShopName:{ShopName}. Id:{Id}", model.DocumentName, model.Id);
			var allFreeQuantity = _shopStorage.GetFullList().Select(x => x.Capacity - x.ShopDocuments.Select(x => x.Value.Item2).Sum()).Sum();
			if (allFreeQuantity < count)
			{
				_logger.LogWarning("AddTravels operation failed.");
				return false;
			}
			foreach (var shop in _shopStorage.GetFullList())
			{
				int freeQuantity = shop.Capacity - shop.ShopDocuments.Select(x => x.Value.Item2).Sum();
				if (freeQuantity <= 0)
				{
					continue;
				}
				if (freeQuantity < count)
				{
					if (!AddDocument(new() { Id = shop.Id }, model, freeQuantity))
					{
						_logger.LogWarning("AddDocuments operation failed.");
						return false;
					}
					count -= freeQuantity;
				}
				else
				{
					if (!AddDocument(new() { Id = shop.Id }, model, count))
					{
						_logger.LogWarning("AddDocuments operation failed.");
						return false;
					}
					count = 0;
				}
				if (count == 0)
				{
					return true;
				}
			}
			_logger.LogWarning("AddDocuments operation failed.");
			return false;
		}
		public bool SellDocuments(IDocumentModel model, int count)
		{
			return _shopStorage.SellDocuments(model, count);
		}
	}
}