using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TravelCompanyContracts.BindingModels;
using TravelCompanyContracts.SearchModels;
using TravelCompanyContracts.StoragesContracts;
using TravelCompanyContracts.ViewModels;
using TravelCompanyFileImplement.Models;

namespace TravelCompanyFileImplement.Implements
{
    public class ClientStorage : IClientStorage
    {   
        private readonly DataFileSingleton source;
        public ClientStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<ClientViewModel> GetFullList()
        {
            return source.Clients
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Email))
            {
                return new();
            }
            return source.Clients
            .Where(x => x.Email.Contains(model.Email))
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public ClientViewModel? GetElement(ClientSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Email) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Clients
            .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Email) && x.Email == model.Email) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }

        public ClientViewModel? Insert(ClientBindingModel model)
        {
            model.Id = source.Clients.Count > 0 ? source.Clients.Max(x => x.Id) + 1 : 1;
            var newClient = Client.Create(model);
            if (newClient == null)
            {
                return null;
            }
            source.Clients.Add(newClient);
            source.SaveClients();
            return newClient.GetViewModel;
        }
        public ClientViewModel? Update(ClientBindingModel model)
        {
            var ingredient = source.Clients.FirstOrDefault(x => x.Id == model.Id);
            if (ingredient == null)
            {
                return null;
            }
            ingredient.Update(model);
            source.SaveClients();
            return ingredient.GetViewModel;
        }
        public ClientViewModel? Delete(ClientBindingModel model)
        {
            var element = source.Clients.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Clients.Remove(element);
                source.SaveClients();
                return element.GetViewModel;
            }
            return null;
        }
    }
}