using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.SearchModels;
using AircraftPlantContracts.StoragesContracts;
using AircraftPlantContracts.ViewModels;
using AircraftPlantFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AircraftPlantFileImplement.Implements
{
    /// <summary>
    /// Реализация интерфейса хранилища для заказов
    /// </summary>
    public class OrderStorage : IOrderStorage
    {
        /// <summary>
        /// Хранилище
        /// </summary>
        private readonly DataFileSingleton _source;

        /// <summary>
        /// Конструктор
        /// </summary>
        public OrderStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }

        /// <summary>
        /// Получение полного списка
        /// </summary>
        /// <returns></returns>
        public List<OrderViewModel> GetFullList()
        {
            return _source.Orders
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение фильтрованного списка
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }

            return _source.Orders
                .Where(x => x.Id.Equals(model.Id))
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            return _source.Orders
                .FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        /// <summary>
        /// Добавление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public OrderViewModel? Insert(OrderBindingModel model)
        {
            model.Id = _source.Orders.Count > 0 ? _source.Orders.Max(x => x.Id) + 1 : 1;

            var newOrder = Order.Create(model);
            if (newOrder == null)
            {
                return null;
            }

            _source.Orders.Add(newOrder);
            _source.SaveOrders();
            return newOrder.GetViewModel;
        }

        /// <summary>
        /// Редактирование элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public OrderViewModel? Update(OrderBindingModel model)
        {
            var order = _source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }

            order.Update(model);
            _source.SaveOrders();
            return order.GetViewModel;
        }

        /// <summary>
        /// Удаление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            var element = _source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                _source.Orders.Remove(element);
                _source.SaveOrders();
                return element.GetViewModel;
            }
            return null;
        }
    }
}