using SushiBarContracts.BindingModel;
using SushiBarContracts.BusinessLogicsContracts;
using SushiBarContracts.SearchModel;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using Microsoft.Extensions.Logging;
using SushiBarDataModels.Enums;
using SushiBarDataModels.Models;
using System.Xml.Linq;

namespace SushiBarBusinessLogic.BusinessLogic
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly IShopStorage _shopStorage;
        private readonly IShopLogic _shopLogic;
        private readonly ISushiStorage _sushiStorage;


        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, 
            IShopLogic shopLogic, IShopStorage shopStorage, ISushiStorage sushiStorage)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _shopStorage = shopStorage;
            _shopLogic = shopLogic;
            _sushiStorage = sushiStorage;
        }

        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id:{ Id}", model?.Id);
            var list = model == null ? _orderStorage.GetFullList() : _orderStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
            if (model.Status != OrderStatus.Неизвестен) return false;
            model.Status = OrderStatus.Принят;
            if (_orderStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool TakeOrderInWork(OrderBindingModel model)
        {
            return ChangeStatus(model, OrderStatus.Выполняется);
        }

        public bool FinishOrder(OrderBindingModel model)
        {
            return ChangeStatus(model, OrderStatus.Готов);

        }

        public bool DeliveryOrder(OrderBindingModel model)
        {
            return ChangeStatus(model, OrderStatus.Выдан);
        }

        private bool ChangeStatus(OrderBindingModel model, OrderStatus orderStatus)
        {
            var order = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            if (order == null)
            {
                _logger.LogWarning("Change status operation failed. Order not found");
                return false;
            }
            if (order.Status + 1 != orderStatus)
            {
                _logger.LogWarning("Change status operation failed. Incorrect new status: {orderStatus}. Current status: {Status}",
                    orderStatus, order.Status);
                return false;
            }
            if(order.Status == OrderStatus.Готов)
            {
                var sushi = _sushiStorage.GetElement(new SushiSearchModel { Id = order.SushiId });
                if (sushi == null)
                {
                    _logger.LogWarning("Status change error. Sushi not found");
                    return false;
                }
                if (!CheckSupply(sushi, order.Count))
                {
                    _logger.LogWarning("Status change error. Shop is overflowed");
                    return false;
                }
            }
            model.Status = orderStatus;

            if (model.Status == OrderStatus.Готов)
            {
                model.DateImplement = DateTime.Now;
            }
            else
            {
                model.DateImplement = order.DateImplement;
            }
            if (_orderStorage.Update(model) == null)
            {
                _logger.LogWarning("Change status operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
                throw new ArgumentNullException(nameof(model));

            if (!withParams) return;

            if (model.SushiId <= 0)
                throw new ArgumentNullException("Неверный идентификатор суши", nameof(model.SushiId));

            if (model.Count <= 0)
                throw new ArgumentNullException("Количество суш в заказе не может быть меньше нуля или равно нулю", nameof(model.Count));

            if (model.Sum <= 0)
                throw new ArgumentNullException("Стоимость заказа не может быть меньше нуля", nameof(model.Sum));

            if (model.DateImplement.HasValue && model.DateImplement < model.DateCreate)
                throw new ArithmeticException("Заказ должен быть выдан позже, чем был создан");

            _logger.LogInformation("Sushi. SushiId:{SushiId}. Count:{ Count}. Sum:{ Sum}. Id: { Id}", 
                model.SushiId, model.Count, model.Sum,  model.Id);
        }

        public bool CheckSupply(ISushiModel model, int count)
        {
            if (count <= 0)
            {
                _logger.LogWarning("Check supply operation error. Planes count < 0");
                return false;
            }

            int sumCapacity = _shopStorage.GetFullList().Select(x => x.MaxCountSushis).Sum();
            int sumCount = _shopStorage.GetFullList().Select(x => x.ShopSushis.Select(y => y.Value.Item2).Sum()).Sum();
            int free = sumCapacity - sumCount;
            if (free < count)
            {
                _logger.LogWarning("Check supply error. No place for new sushis");
                return false;
            }

            foreach (var shop in _shopStorage.GetFullList())
            {
                free = shop.MaxCountSushis;
                foreach (var sushi in shop.ShopSushis)
                {
                    free -= sushi.Value.Item2;
                }

                if (free == 0)
                {
                    continue;
                }

                if (free >= count)
                {
                    if (_shopLogic.AddSushiInShop(new()
                    {
                        Id = shop.Id
                    }, model, count))
                    {
                        count = 0;
                    }
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                else
                {
                    if (_shopLogic.AddSushiInShop(new()
                    {
                        Id = shop.Id
                    }, model, free))
                    {
                        count -= free;
                    }
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (count <= 0)
                {
                    return true;
                }
            }
            return false;
        }
    }
}