using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ComputerShopContracts.BindingModels;
using ComputerShopContracts.SearchModels;
using ComputerShopContracts.StoragesContracts;
using ComputerShopContracts.ViewModels;
using ComputerShopFileImplement.Models;


namespace ComputerShopFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;

        public OrderStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (model.ImplementerId.HasValue && model.Status != null) return source.Orders.FirstOrDefault(x => x.ImplementerId == model.ImplementerId && model.Status.Equals(x.Status))?.GetViewModel;
            if (model.ImplementerId.HasValue)
            {
                return source.Orders.FirstOrDefault(x => x.ImplementerId == model.ImplementerId)?.GetViewModel;
            }
            if (!model.Id.HasValue)
            {
                return null;
            }
            return source.Orders.FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id)).GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue && !model.ClientId.HasValue && model.Status == null)
            {
                return new();
            }
            if (model.ClientId.HasValue)
            {
                return source.Orders
                    .Where(x => x.ClientId == model.ClientId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            if (model.Status != null)
            {
                return source.Orders
                    .Where(x => model.Status.Equals(x.Status))
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            return source.Orders
            .Where(x => x.Id == model.Id || model.DateFrom <= x.DateCreate && x.DateCreate <= model.DateTo)
            .Select(x => x.GetViewModel)
            .ToList();

        }

        public List<OrderViewModel> GetFullList()
        {
            return source.Orders.Select(x => x.GetViewModel).ToList();
        }

        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;
        }

        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;
        }
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            source.Orders.Remove(order);
            source.SaveOrders();
            return order.GetViewModel;
        }
    }
}