using AutomobilePlantContracts.BindingModels;
using AutomobilePlantContracts.BusinessLogicContracts;
using AutomobilePlantContracts.SearchModels;
using AutomobilePlantContracts.StorageContracts;
using AutomobilePlantContracts.ViewModels;
using AutomobilePlantDataModels.Enums;
using AutomobilePlantDataModels.Models;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutomobilePlantBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly IShopStorage _shopStorage;
        private readonly IShopLogic _shopLogic;
        private readonly ICarStorage _carStorage;

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IShopLogic shopLogic, ICarStorage carStorage, IShopStorage shopStorage)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _shopLogic = shopLogic;
            _carStorage = carStorage;
            _shopStorage = shopStorage;
        }

        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 rawModel, OrderStatus newStatus)
        {
            var viewModel = _orderStorage.GetElement(new OrderSearchModel
            {
                Id = rawModel.Id
            });

            if (viewModel == null)
            {
                _logger.LogWarning("Order model not found");
                return false;
            }

            OrderBindingModel model = new OrderBindingModel
            {
                Id = viewModel.Id,
                CarId = viewModel.CarId,
                Status = viewModel.Status,
                DateCreate = viewModel.DateCreate,
                DateImplement = viewModel.DateImplement,
                Count = viewModel.Count,
                Sum = viewModel.Sum,
				ImplementerId = viewModel.ImplementerId
			};

            if (rawModel.ImplementerId.HasValue)
            {
                model.ImplementerId = rawModel.ImplementerId;
            }

            CheckModel(model, false);
            if (model.Status + 1 != newStatus)
            {
                _logger.LogWarning("Status update to " + newStatus.ToString() + " operation failed. Order status incorrect.");
                return false;
            }
            if (newStatus == OrderStatus.Готов)
            {
                var car = _carStorage.GetElement(new CarSearchModel() { Id = model.CarId });
                if (car == null)
                {
                    _logger.LogWarning("Status update to " + newStatus.ToString() + " operation failed. Document not found.");
                    return false;
                }
                if (CheckThenSupplyMany(car, model.Count) == false)
                {
                    _logger.LogWarning("Status update to " + newStatus.ToString() + " operation failed. Shop supply error.");
                    return false;
                }
            }
            model.Status = newStatus;
            if (model.Status == OrderStatus.Выдан) model.DateImplement = DateTime.Now;
            if (_orderStorage.Update(model) == null)
            {
                model.Status--;
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        public bool CheckThenSupplyMany(ICarModel car, int count)
        {
            if (count <= 0)
            {
                _logger.LogWarning("Check then supply operation error. Car count < 0.");
                return false;
            }

            int freeSpace = 0;
            foreach (var shop in _shopStorage.GetFullList())
            {
                freeSpace += shop.MaxCountCars;
                foreach (var c in shop.ShopCars)
                {
                    freeSpace -= c.Value.Item2;
                }
            }

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

            foreach (var shop in _shopStorage.GetFullList())
            {
                freeSpace = shop.MaxCountCars;
                foreach (var c in shop.ShopCars)
                {
                    freeSpace -= c.Value.Item2;
                }
                if (freeSpace == 0)
                {
                    continue;
                }
                if (freeSpace - count >= 0)
                {
                    if (_shopLogic.SupplyCars(new() { Id = shop.Id }, car, count)) count = 0;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (freeSpace - count < 0)
                {
                    if (_shopLogic.SupplyCars(new() { Id = shop.Id }, car, freeSpace)) count -= freeSpace;
                    else
                    {
                        _logger.LogWarning("Supply error");
                        return false;
                    }
                }
                if (count <= 0)
                {
                    return true;
                }
            }
            return false;
        }

        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;
        }

        public OrderViewModel? ReadElement(OrderSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Id:{ Id}", model.Id);
            var element = _orderStorage.GetElement(model);
            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
            return element;
        }

        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.CarId < 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор авто", nameof(model.CarId));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество авто 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}. CarId: { CarId}", model.Id, model.Sum, model.CarId);
        }
    }
}