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;

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

        private bool ChangeStatus(OrderBindingModel model, OrderStatus orderStatus)
        {
            if (model.Status + 1 != orderStatus)
            {
                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)
        {
            model = Find(model);
            if (model == null)
            {
                return false;
            }
            if (!ChangeStatus(model, OrderStatus.Выполняется))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }
            _orderStorage.Update(model);
            return true;          
        }

        public bool FinishOrder(OrderBindingModel model)
        {
            model = Find(model);
            if (model == null) {
                return false;
            }
            if (!ChangeStatus(model, OrderStatus.Готов))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }
            _orderStorage.Update(model);
            return true;          
        }

        public bool DeliveryOrder(OrderBindingModel model)
        {
            model = Find(model);
            if (model == null)
            {
                return false;
            }
            if (!ChangeStatus(model, OrderStatus.Выдан))
            {
                _logger.LogWarning("Order's status is wrong");
                return false;
            }
            model.DateImplement = DateTime.Now;
            _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);
        }

        private OrderBindingModel? Find(OrderBindingModel model)
        {
            var modelView = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
            if (modelView == null)
            {
                return null;
            }
            model.FurnitureId = modelView.FurnitureId;
            model.DateCreate = modelView.DateCreate;
            model.Count = modelView.Count;
            model.Sum = modelView.Sum;
            model.FurnitureId = model.FurnitureId;
            model.Status = modelView.Status;
            return model;
        }
    }
}