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

namespace DinerFileImplement.Implements
{
    public class FoodStorage : IFoodStorage
    {
        private readonly DataFileSingleton _source;

        public FoodStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }

        public FoodViewModel? Delete(FoodBindingModel model)
        {
            var element = _source.Foods.FirstOrDefault(x => x.ID == model.ID);
            if (element != null) {
                _source.Foods.Remove(element);
                _source.SaveFoods();
                return element.GetViewModel;
            }
            return null;
        }

        public FoodViewModel? GetElement(FoodSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName) && !model.ID.HasValue) { return null; }
            return _source.Foods
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.ComponentName) &&
                                x.ComponentName == model.ComponentName) || model.ID.HasValue &&
                                x.ID == model.ID)?.GetViewModel;
        }

        public List<FoodViewModel> GetFilteredList(FoodSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName)) { return new(); }
            return _source.Foods.Where(x => x.ComponentName.Contains(model.ComponentName))
                                .Select(x => x.GetViewModel).ToList();

        }

        public List<FoodViewModel> GetFullList()
        {
            return _source.Foods.Select(x => x.GetViewModel).ToList();
        }

        public FoodViewModel? Insert(FoodBindingModel model)
        {
            model.ID = _source.Foods.Count > 0 ? _source.Foods.Max(x => x.ID) + 1 : 1;
            var newComponent = Food.Create(model);
            if (newComponent == null) { return null; }
            _source.Foods.Add(newComponent);
            _source.SaveFoods();
            return newComponent.GetViewModel;
        }

        public FoodViewModel? Update(FoodBindingModel model)
        {
            var component = _source.Foods.FirstOrDefault(x => x.ID == model.ID);
            if (component == null) { return null; }
            component.Update(model);
            _source.SaveFoods();
            return component.GetViewModel;
        }
    }
}