using TypographyContracts.BusinessLogicsContracts;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TypographyContracts.BindingModels;
using TypographyContracts.SearchModels;
using TypographyContracts.StoragesContracts;
using TypographyContracts.ViewModels;
using TypographyDataModels.Enums;
using Microsoft.Extensions.Logging;
using TypographyDataModels.Models;

namespace TypographyBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly IShopStorage _shopStorage;
        private readonly IShopLogic _shopLogic;
        private readonly IPrintedStorage _printedStorage;

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IShopStorage shopStorage, IShopLogic shopLogic, IPrintedStorage printedStorage)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _shopStorage = shopStorage;
            _shopLogic = shopLogic;
            _printedStorage = printedStorage;
        }

        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)
            {
                model.Status = OrderStatus.Неизвестен;
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        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 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(IPrintedModel printed, int count)
        {
            if (count <= 0)
            {
                _logger.LogWarning("Check supply operation error. Printed count < 0");
                return false;
            }
            int Capacity = _shopStorage.GetFullList().Select(x => x.MaxCountPrinteds).Sum();
            int currentCount = _shopStorage.GetFullList().Select(x => x.ShopPrinteds.Select(y => y.Value.Item2).Sum()).Sum();
            int freeSpace = Capacity - currentCount;

            if (freeSpace < count)
            {
                _logger.LogWarning("Check supply error. No place for new Printeds");
                return false;
            }
            foreach (var shop in _shopStorage.GetFullList())
            {
                freeSpace = shop.MaxCountPrinteds;
                foreach (var doc in shop.ShopPrinteds)
                {
                    freeSpace -= doc.Value.Item2;
                }
                if (freeSpace == 0)
                {
                    continue;
                }
                if (freeSpace >= count)
                {
                    if (_shopLogic.MakeShipment(new()
                    {
                        Id = shop.Id
                    }, printed, count))
                    {
                        count = 0;
                    }
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                else
                {
                    if (_shopLogic.MakeShipment(new() { Id = shop.Id }, printed, freeSpace))
                        count -= freeSpace;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (count <= 0)
                {
                    return true;
                }
            }
            return false;
        }

        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");
            }
            if (status == OrderStatus.Готов)
            {
                var printed = _printedStorage.GetElement(new PrintedSearchModel() { Id = model.PrintedId });
                if (printed == null)
                {
                    _logger.LogWarning("Status change error. Printed not found");
                    return false;
                }
                if (!CheckSupply(printed, model.Count))
                {
                    _logger.LogWarning("Status change error. Shop doesnt have printedes");
                    return false;
                }
            }
            model.Status = status;
            if (model.Status == OrderStatus.Выдан) model.DateImplement = DateTime.Now;
            _orderStorage.Update(model);
            return true;
        }
    }
}