using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.BusinessLogicsContarcts;
using FurnitureAssemblyContracts.SearchModels;
using FurnitureAssemblyContracts.StoragesContracts;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FurnitureAssemblyBusinessLogic
{
    public class OrderLogic : IOrderLogic
    {
        private readonly ILogger _logger;
        private readonly IOrderStorage _orderStorage;
        private readonly IShopLogic _shopLogic;

        public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, IShopLogic shopLogic)
        {
            _logger = logger;
            _orderStorage = orderStorage;
            _shopLogic = shopLogic;          
        }

        private bool ChangeStatus(OrderBindingModel model, OrderStatus orderStatus)
        {
            if (model.Status + 1 != orderStatus && !(model.Status == OrderStatus.Ожидание && orderStatus == OrderStatus.Готов) && !(model.Status == OrderStatus.Выполняется && orderStatus == OrderStatus.Ожидание))
            {
                return false;
            }
            model.Status = orderStatus;
            return true;
        }

        public bool CreateOrder(OrderBindingModel model)
        {
            CheckModel(model);
           
            if (!ChangeStatus(model, OrderStatus.Принят))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }

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

        public bool TakeOrderInWork(OrderBindingModel model)
        {
            var modelNew = ReadElement(new OrderSearchModel { Id = model.Id }); // в связи с обновлением контракта, предыдущий метод не нужен
            if (modelNew == null)
            {
                return false;
            }
            _logger.LogWarning($"");
            if (modelNew.ImplementerId.HasValue)
            {
                _logger.LogWarning($"Order {model.Id} is already in Work");
                throw new InvalidOperationException($"Order {model.Id} is already in Work");
            }
            model.Status = modelNew.Status;
            if (!ChangeStatus(model, OrderStatus.Выполняется))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }
            _orderStorage.Update(model);
            return true;          
        }

        public bool FinishOrder(OrderBindingModel model)
        {
            var modelNew = ReadElement(new OrderSearchModel { Id = model.Id}); // в связи с обновлением контракта, предыдущий метод не нужен
            if (modelNew == null) {
                return false;
            }
            model.ImplementerId = modelNew.ImplementerId;
            model.Status = modelNew.Status;
            if (!_shopLogic.AddFurnituresAtShops(new FurnitureBindingModel() { Id = modelNew.FurnitureId }, modelNew.Count))
            {
                if (!ChangeStatus(model, OrderStatus.Ожидание))
                {
                    _logger.LogWarning($"Order's status {model.Status} is wrong");
                    return false;
                }
                _orderStorage.Update(model);
                _logger.LogWarning("There are not empty places at shops. Replenishment is impossible");
                return false;
            }
            
            if (!ChangeStatus(model, OrderStatus.Готов))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }
             model.DateImplement = DateTime.Now;
            _orderStorage.Update(model);
            return true;          
        }

        public bool DeliveryOrder(OrderBindingModel model)
        {
            var modelNew = ReadElement(new OrderSearchModel { Id = model.Id }); // в связи с обновлением контракта, предыдущий метод не нужен
            if (modelNew == null)
            {
                return false;
            }
    
                
            model.Status = modelNew.Status;
            model.ImplementerId = modelNew.ImplementerId;
            model.DateImplement = modelNew.DateImplement;
            if (!ChangeStatus(model, OrderStatus.Выдан))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }
           
            _orderStorage.Update(model);
            return true;      
        }

       
        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;
        }

       
        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.FurnitureId <= 0)
            {
                throw new ArgumentNullException("Неверный идентификатор изделия", nameof(model.FurnitureId));
            }
            if (model.Count <= 0)
            {
                throw new ArgumentNullException("Количество изделий должно быть больше 0", nameof(model.Count));
            }
            if (model.Sum <= 0)
            {
                throw new ArgumentNullException("Стоимость заказа должна быть больше 0", nameof(model.Sum));
            }
            _logger.LogInformation("Order. OrderId: { Id}. OrderStatus: {OrderStatus} DateCreate: {DateCreate} " +
                "FurnitureId:{FurnitureId}. Count:{ Count}. Sum:{ Sum}. ", 
                model.Id, model.Status, model.DateCreate, model.FurnitureId, model.Count, model.Sum);
        }

        public OrderViewModel? ReadElement(OrderSearchModel? model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Status: {Status}. ImplementerId: {ImplementerId} Id:{ Id}", model.Status, model.ImplementerId, 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;
        }
    }
}