using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContracts;
using ConfectioneryContracts.ViewModels;
using ConfectioneryListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfectioneryListImplement
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataListSingleton _source;

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

        public List<OrderViewModel> GetFullList()
        {
            var result = new List<OrderViewModel>();
            foreach (var order in _source.Orders)
            {
                result.Add(AttachPastryName(order.GetViewModel));
            }
            return result;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
			var result = new List<OrderViewModel>();
			if (model.DateFrom.HasValue)
			{
				foreach (var order in _source.Orders)
				{
					if (order.DateCreate >= model.DateFrom && order.DateCreate <= model.DateTo)
					{
						result.Add(GetViewModel(order));
					}
				}
			}
			else if (model.ClientId.HasValue && !model.Id.HasValue)
			{
				foreach (var order in _source.Orders)
				{
					if (order.ClientId == model.ClientId)
					{
						result.Add(GetViewModel(order));
					}
				}
			}
			else if (model.ImplementerId.HasValue && !model.Id.HasValue)
			{
				foreach (var order in _source.Orders)
				{
					if (order.ImplementerId == model.ImplementerId)
					{
						result.Add(GetViewModel(order));
					}
				}
			}
			else if (model.Id.HasValue)
			{
				foreach (var order in _source.Orders)
				{
					if (order.Id == model.Id)
					{
						result.Add(GetViewModel(order));
					}
				}
			}
			return result;
		}
		private OrderViewModel GetViewModel(Order order)
		{
			var viewModel = order.GetViewModel;
			foreach (var package in _source.Pastrys)
			{
				if (package.Id == order.PastryId)
				{
					viewModel.PastryName = package.PastryName;
					break;
				}
			}
			foreach (var client in _source.Clients)
			{
				if (client.Id == order.ClientId)
				{
					viewModel.ClientFIO = client.ClientFIO;
					break;
				}
			}
			return viewModel;
		}

		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 AttachPastryName(order.GetViewModel);
				}
				else if (model.ImplementerId.HasValue && model.ImplementerId == order.ImplementerId)
				{
					return GetViewModel(order);
				}
			}
			return null;
		}

        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 AttachPastryName(newOrder.GetViewModel);
        }

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

        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 AttachPastryName(element.GetViewModel);
                }
            }
            return null;
        }

        private OrderViewModel AttachPastryName(OrderViewModel model)
        {
            foreach (var Pastry in _source.Pastrys)
            {
                if (Pastry.Id == model.PastryId)
                {
                    model.PastryName = Pastry.PastryName;
                    return model;
                }
            }
            return model;
        }
    }
}