using DinerContracts.BindingModels;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using DinerListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DinerListImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataListSingleton _source;

        public OrderStorage() { 
            _source = DataListSingleton.GetInstance();
        }

        public OrderViewModel? Delete(OrderBindingModel model)
        {
            for (int i = 0; i < _source.Orders.Count; ++i) { 
                if (_source.Orders[i].ID == model.ID) { 
                    var element = _source.Orders[i];
                    _source.Orders.RemoveAt(i);
                    return GetViewModel(element);
                }
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.ID.HasValue) return null;
            foreach (var order in _source.Orders) { 
                if (model.ID.HasValue && order.ID == model.ID) { 
                    return GetViewModel(order);
                }
            }
            return null;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            var result = new List<OrderViewModel>();
            if (!model.ID.HasValue) return result;
            foreach (var order in _source.Orders) { 
                if (order.ID == model.ID) {
                    result.Add(GetViewModel(order));
                }
            }
            return result;
        }

        public List<OrderViewModel> GetFullList()
        {
            var result = new List<OrderViewModel>();
            foreach (var order in _source.Orders) {
                result.Add(GetViewModel(order));
            }
            return result;
        }
        private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            foreach (var product in _source.Snacks)
            {
                if (product.ID == order.ProductID)
                {
                    viewModel.ProductName = product.ProductName;
                    break;
                }
            }
            return viewModel;
        }
        public OrderViewModel? Insert(OrderBindingModel model)
        {
            model.ID = 1;
            foreach (var order in _source.Orders) {
                if (model.ID <= order.ID) {
                    model.ID = order.ID + 1;
                }
            }
            var newOrder = Order.Create(model);
            if (newOrder == null) return null;
            _source.Orders.Add(newOrder);
            return GetViewModel(newOrder);
        }

        public OrderViewModel? Update(OrderBindingModel model)
        {
            foreach (var order in _source.Orders) { 
                if (order.ID == model.ID) {
                    order.Update(model);
                    return GetViewModel(order);
                }
            }
            return null;
        }
    }
}