using SushiBarContracts.BindingModels;
using SushiBarContracts.SearchModels;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SushiBarListImplement
{
    public class ClientStorage : IClientStorage
    {
        private readonly DataListSingleton _source;

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

        public ClientViewModel? Insert(ClientBindingModel model)
        {
            model.Id = 1;
            foreach (var client in _source.Clients)
            {
                if (model.Id <= client.Id)
                {
                    model.Id = client.Id + 1;
                }
            }
            var newClient = Client.Create(model);
            if (newClient == null) { return null; }
            _source.Clients.Add(newClient);
            return newClient.GetViewModel;
        }

        public ClientViewModel? Update(ClientBindingModel model)
        {
            foreach (var client in _source.Clients)
            {
                if (client.Id == model.Id)
                {
                    client.Update(model);
                    return client.GetViewModel;
                }
            }
            return null;
        }

        public ClientViewModel? Delete(ClientBindingModel model)
        {
            for (int i = 0; i < _source.Clients.Count; i++)
            {
                if (model.Id == _source.Clients[i].Id)
                {
                    var element = _source.Clients[i];
                    _source.Clients.RemoveAt(i);
                    return element.GetViewModel;
                }
            }
            return null;
        }

        public ClientViewModel? GetElement(ClientSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Email) && !model.Id.HasValue)
            {
                return null;
            }

            foreach (var client in _source.Clients)
            {
                if ((!string.IsNullOrEmpty(model.Email) && model.Email == client.Email) || (model.Id.HasValue && model.Id.Value == client.Id))
                {
                    return client.GetViewModel;
                }
            }
            return null;
        }

        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
        {
            var result = new List<ClientViewModel>();
            if (string.IsNullOrEmpty(model.Email))
            {
                return result;
            }
            foreach (var client in _source.Clients)
            {
                if (client.Email.Contains(model.Email))
                {
                    result.Add(client.GetViewModel);
                }
            }
            return result;
        }

        public List<ClientViewModel> GetFullList()
        {
            var result = new List<ClientViewModel>();
            foreach (var client in _source.Clients)
            {
                result.Add(client.GetViewModel);
            }
            return result;
        }

    }
}