using ComputersShopContracts.BindingModels;
using ComputersShopContracts.SearchModels;
using ComputersShopContracts.StoragesContracts;
using ComputersShopContracts.ViewModels;
using ComputersShopListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputersShopListImplement.Implements
{
    public class ComputerStorage : IComputerStorage
    {
        private readonly DataListSingleton _source;
        public ComputerStorage()
        {
            _source = DataListSingleton.GetInstance();
        }
        public List<ComputerViewModel> GetFullList()
        {
            var result = new List<ComputerViewModel>();
            foreach (var Computer in _source.Computers)
            {
                result.Add(Computer.GetViewModel);
            }
            return result;
        }
        public List<ComputerViewModel> GetFilteredList(ComputerSearchModel model)
        {
            var result = new List<ComputerViewModel>();
            if (string.IsNullOrEmpty(model.ComputerName))
            {
                return result;
            }
            foreach (var Computer in _source.Computers)
            {
                if (Computer.ComputerName.Contains(model.ComputerName))
                {
                    result.Add(Computer.GetViewModel);
                }
            }
            return result;
        }
        public ComputerViewModel? GetElement(ComputerSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComputerName) && !model.Id.HasValue)
            {
                return null;
            }
            foreach (var Computer in _source.Computers)
            {
                if ((!string.IsNullOrEmpty(model.ComputerName) && Computer.ComputerName == model.ComputerName) ||
                (model.Id.HasValue && Computer.Id == model.Id))
                {
                    return Computer.GetViewModel;
                }
            }
            return null;
        }
        public ComputerViewModel? Insert(ComputerBindingModel model)
        {
            model.Id = 1;
            foreach (var Computer in _source.Computers)
            {
                if (model.Id <= Computer.Id)
                {
                    model.Id = Computer.Id + 1;
                }
            }
            var newComputer = Computer.Create(model);
            if (newComputer == null)
            {
                return null;
            }
            _source.Computers.Add(newComputer);
            return newComputer.GetViewModel;
        }
        public ComputerViewModel? Update(ComputerBindingModel model)
        {
            foreach (var Computer in _source.Computers)
            {
                if (Computer.Id == model.Id)
                {
                    Computer.Update(model);
                    return Computer.GetViewModel;
                }
            }
            return null;
        }
        public ComputerViewModel? Delete(ComputerBindingModel model)
        {
            for (int i = 0; i < _source.Computers.Count; ++i)
            {
                if (_source.Computers[i].Id == model.Id)
                {
                    var element = _source.Computers[i];
                    _source.Computers.RemoveAt(i);
                    return element.GetViewModel;
                }
            }
            return null;
        }
    }
}