using CarRepairShopContracts.BindingModels;
using CarRepairShopContracts.BusinessLogicsContracts;
using CarRepairShopContracts.SearchModels;
using CarRepairShopContracts.StoragesContracts;
using CarRepairShopContracts.ViewModels;
using CarRepairShopDataModels.Enums;
using CarRepairShopDataModels.Models;
using Microsoft.Extensions.Logging;

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

        private readonly IOrderStorage _orderStorage;

        private readonly IRepairStorage _repairStorage;

        private readonly IShopStorage _shopStorage;

        private readonly IShopLogic _shopLogic;

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IRepairStorage repairStorage,
            IShopStorage shopStorage, IShopLogic shopLogic)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _repairStorage = repairStorage;
            _shopStorage = shopStorage;
            _shopLogic = shopLogic;
        }

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

        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;
        }

        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 void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.RepairId <= 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор ремонта", nameof(model.RepairId));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("В заказе должен быть хотя бы один ремонт", nameof(model.Count));
            }
            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Стоимость заказа должна быть больше 0", nameof(model.Sum));
            }
            _logger.LogInformation("Order. Id: {Id}. Sum: {Sum}. CarRepairId: {CarRepairId}. CarRepairCount: {Count}", model.Id, model.Sum, 
                model.RepairId, model.Count);
        }

        private bool ChangeStatus(OrderBindingModel model, OrderStatus newStatus)
        {
            CheckModel(model, false);
            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 != newStatus)
            {
                _logger.LogWarning("Change status operation failed. Incorrect new status: {newStatus}. Current status: {currStatus}",
                    newStatus, order.Status);
                return false;
            }
            if (newStatus == OrderStatus.Выдан)
            {
                var repair = _repairStorage.GetElement(new RepairSearchModel() { Id = order.RepairId });
                if (repair == null)
                {
                    _logger.LogWarning("Change status operation failed. Repairs not found");
                    return false;
                }
                if (!DeliverRepairs(repair, order.Count))
                {
                    _logger.LogWarning("Change status operation failed. Repairs delivery operation failed");
                    return false;
                }
            }
            model.RepairId = order.RepairId;
            model.Count = order.Count;
            model.Sum = order.Sum;
            model.DateCreate = order.DateCreate;
            model.Status = newStatus;
            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 bool DeliverRepairs(IRepairModel repair, int count)
        {
            if (count <= 0)
            {
                _logger.LogWarning("Repairs delivery operation failed. Repair count <= 0");
                return false;
            }

            var shopList = _shopStorage.GetFullList();
            int shopsCapacity = shopList.Sum(x => x.RepairMaxAmount);
            int currentRepairs = shopList.Select(x => x.ShopRepairs.Sum(y => y.Value.Item2)).Sum();
            int freePlaces = shopsCapacity - currentRepairs;

            if (freePlaces < count)
            {
                _logger.LogWarning("Repairs delivery operation failed. No space for new repairs");
                return false;
            }

            foreach (var shop in shopList)
            {
                freePlaces = shop.RepairMaxAmount - shop.ShopRepairs.Sum(x => x.Value.Item2);
                if (freePlaces == 0)
                {
                    continue;
                }
                if (freePlaces >= count)
                {
                    if (_shopLogic.MakeShipment(new() { Id = shop.Id }, repair, count))
                    {
                        count = 0;
                    }
                    else
                    {
                        _logger.LogWarning("Repairs delivery operation failed");
                        return false;
                    }
                }
                else
                {
                    if (_shopLogic.MakeShipment(new() { Id = shop.Id }, repair, freePlaces))
                    {
                        count -= freePlaces;
                    }
                    else
                    {
                        _logger.LogWarning("Repairs delivery operation failed");
                        return false;
                    }
                }
                if (count == 0)
                {
                    return true;
                }
            }
            return false;
        }
    }
}