using Microsoft.Extensions.Logging;
using SewingDressesContracts.BindingModels;
using SewingDressesContracts.BusinessLogicsContracts;
using SewingDressesContracts.SearchModels;
using SewingDressesContracts.StoragesContracts;
using SewingDressesContracts.ViewModels;
using SewingDressesDataModels.Enums;
using SewingDressesDataModels.Models;
using System.Collections.Specialized;

namespace SewingDressesBusinessLogic.BusinessLogic
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly IShopStorage _shopStorage;
        private readonly IShopLogic _shopLogic;
        private readonly IDressStorage _dressStorage;
        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IShopStorage shopStorage, IShopLogic shopLogic, IDressStorage dressStorage)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _shopStorage = shopStorage;
            _shopLogic = shopLogic;
            _dressStorage = dressStorage;
        }

        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            _logger.LogInformation("ReadList. 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)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество заказов должно быть больше нуля");
            }
            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Цена заказа должна быть больше нуля");
            }
            _logger.LogInformation("Order. OrderId:{Id}. Sum:{Sum}", model.Id, model.Sum);
        }

        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;

        }

        private bool ChangeStatus(OrderBindingModel model, OrderStatus status) 
        {
            var element = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            if (element == null)
            {
                _logger.LogWarning("Find order failed");
                return false;
            }
            if (element.Status != status-1)
            {
                _logger.LogWarning("Status change failed");
                throw new InvalidOperationException("Невозможно перевести состояние заказа");
            }
            model.Status = status;
            if (model.Status == OrderStatus.Выдан) model.DateImplement = DateTime.Now;
            _orderStorage.Update(model);
            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);
        }

        public bool CheckSupply(IDressModel dress, int count)
        {
            if (count <= 0)
            {
                _logger.LogWarning("Check supply operation error. Dress count < 0");
                return false;
            }
            int sumCapacity = _shopStorage.GetFullList().Select(x => x.MaxCount).Sum();
            int sumCount = _shopStorage.GetFullList().Select(x => x.ShopDresses.Select(y => y.Value.Item2).Sum()).Sum();
            int free = sumCapacity - sumCount;

            if (free < count)
            {
                _logger.LogWarning("Check supply error. No place for new Dresses");
                return false;
            }
            foreach (var shop in _shopStorage.GetFullList())
            {
                free = shop.MaxCount;
                foreach (var doc in shop.ShopDresses)
                {
                    free -= doc.Value.Item2;
                }
                if (free == 0)
                {
                    continue;
                }
                if (free >= count)
                {
                    if (_shopLogic.MakeSupply(new()
                    {
                        Id = shop.Id
                    }, dress, count))
                    {
                        count = 0;
                    }
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                else
                {
                    if (_shopLogic.MakeSupply(new() { Id = shop.Id}, dress, free))
                        count -= free;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (count <= 0)
                {
                    return true;
                }
            }
            return false;
        }   
    }
}