using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContract;
using ConfectioneryContracts.ViewModels;
using ConfectioneryListImplement.Models;

namespace ConfectioneryListImplement
{
    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 element.GetViewModel;
                }
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (model.ImplementerId.HasValue)
            {
                return _source.Orders.FirstOrDefault(x => x.ImplementerId == model.ImplementerId)?.GetViewModel;
			}
            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 && model.DateFrom.HasValue && model.DateTo.HasValue) // если не ищем по айдишнику, значит ищем по диапазону дат
            {
                return _source.Orders
                    .Where(x => model.DateFrom <= x.DateCreate.Date && x.DateCreate <= model.DateTo)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            if (!model.Id.HasValue && model.ClientId.HasValue)
            {
                return _source.Orders
                    .Where(x => x.ClientId == model.ClientId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            if (!model.Id.HasValue && model.Status.HasValue)
            {
                return _source.Orders
                    .Where(x => x.Status == model.Status)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            if (model.ImplementerId.HasValue)
            {
                var res = _source.Orders.FirstOrDefault(x => x.ImplementerId == model.ImplementerId);
                return res != null ? new() { res.GetViewModel } : new();
            }
            foreach (var order in _source.Orders)
            {
                if (order.Id == model.Id)
                {
                    return new() { GetViewModel(order) };
                }
            }
            return new();
        }

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

        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 newOrder.GetViewModel;
        }

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

        private OrderViewModel GetViewModel(Order model)
        {
            var res = model.GetViewModel;
            foreach (var pastry in _source.Pastry)
            {
                if (pastry.Id == model.PastryId)
                {
                    res.PastryName = pastry.PastryName;
                    break;
                }
            }
            return res;
        }
    }
}