using GiftShopContracts.BindingModels;
using GiftShopContracts.BusinessLogicsContracts;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopDataModels.Enums;
using GiftShopDataModels.Models;
using Microsoft.Extensions.Logging;

namespace GiftShopBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;

        private readonly IOrderStorage _orderStorage;

        private readonly IShopStorage _shopStorage;
        private readonly IShopLogic _shopLogic;
        private readonly IGiftStorage _giftStorage;

        public OrderLogic(IOrderStorage orderStorage, IShopStorage shopStorage, IShopLogic shopLogic, IGiftStorage giftStorage, ILogger<OrderLogic> logger)
        {
            _shopStorage = shopStorage;
            _logger = logger;
            _shopLogic = shopLogic;
            _giftStorage = giftStorage;
            _orderStorage = orderStorage;
        }
        public bool CheckSupply(IGiftModel gift, int count)
        {
            if (count <= 0)
            {
                _logger.LogWarning("Check then supply operation error. gift count < 0.");
                return false;
            }

            int sumCapacity = 0;
            int sumCount = 0;
            sumCapacity = _shopStorage.GetFullList().Select(x => x.MaxCapacity).Sum();
            sumCount = _shopStorage.GetFullList().Select(x => x.ShopGifts.Select(y => y.Value.Item2).Sum()).Sum();
            int freeSpace = sumCapacity - sumCount;

            if (freeSpace - count < 0)
            {
                _logger.LogWarning("Check then supply operation error. There's no place for new gift in shops.");
                return false;
            }

            foreach (var shop in _shopStorage.GetFullList())
            {
                freeSpace = shop.MaxCapacity;
                foreach (var doc in shop.ShopGifts)
                {
                    freeSpace -= doc.Value.Item2;
                }
                if (freeSpace == 0)
                {
                    continue;
                }
                if (freeSpace - count >= 0)
                {
                    if (_shopLogic.MakeSupply(new() { Id = shop.Id }, gift, count))
                        count = 0;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (freeSpace - count < 0)
                {
                    if (_shopLogic.MakeSupply(new() { Id = shop.Id }, gift, freeSpace))
                        count -= freeSpace;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (count <= 0)
                {
                    return true;
                }
            }
            return false;
        }
        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);

            if (model.Status != OrderStatus.Неизвестен)
            {
                _logger.LogWarning("Insert operation failed. Order status incorrect.");
                return false;
            }

            model.Status = OrderStatus.Принят;

            if (_orderStorage.Insert(model) == null)
            {
                model.Status = OrderStatus.Неизвестен;
                _logger.LogWarning("Insert operation failed");
                return false;
            }

            return true;
        }

        public bool StatusUpdate(OrderBindingModel model, OrderStatus newStatus)
        {
            var viewModel = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            CheckModel(model);

            if (model.Status + 1 != newStatus)
            {
                _logger.LogWarning("Status update to " + newStatus.ToString() + " operation failed. Order status incorrect.");
                return false;
            }

            model.Status = newStatus;

            if (model.Status == OrderStatus.Выдан)
                model.DateImplement = DateTime.Now;
            else
            {
                model.DateImplement = viewModel.DateImplement;
            }
            CheckModel(model);

            if (_orderStorage.Update(model) == null)
            {
                model.Status--;
                _logger.LogWarning("Update operation failed");
                return false;
            }

            return true;
        }

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

        public bool DeliveryOrder(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Готов);
        }

        public bool FinishOrder(OrderBindingModel model)
        {
            return StatusUpdate(model, OrderStatus.Выдан);
        }

        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation("Order. OrderId:{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;
        }

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

            if (!withParams)
            {
                return;
            }

            if (model.GiftId < 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор изделия", nameof(model.GiftId));
            }

            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество изделий в заказе должно быть больше 0", nameof(model.Count));
            }

            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Сумма заказа должна быть больше 0", nameof(model.Sum));
            }

            _logger.LogInformation("Order. OrderId:{Id}.Sum:{ Sum}. EngineId: { EngineId}", model.Id, model.Sum, model.GiftId);
        }
    }
}