using DocumentFormat.OpenXml.Bibliography;
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 TravelCompanyListImplement.Models;

namespace TravelCompanyFileImplement.Implements
{
	public class ImplementerStorage : IImplementerStorage
	{
        private readonly DataFileSingleton _source;
        public ImplementerStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }
        public ImplementerViewModel? Delete(ImplementerBindingModel model)
		{
            var element = _source.Implementers.FirstOrDefault(x => x.Id == model.Id);
			if (element != null)
			{
                _source.Implementers.Remove(element);
                _source.SaveConditions();
                return element.GetViewModel;
            }
            return null;
        }

		public ImplementerViewModel? GetElement(ImplementerSearchModel model)
		{
            if (string.IsNullOrEmpty(model.ImplementerFIO) && !model.Id.HasValue && 
                string.IsNullOrEmpty(model.Password))
            {
                return null;
            }
            if (model.ImplementerFIO != null && model.Password != null)
            {
                return _source.Implementers
                .FirstOrDefault(x =>
                x.ImplementerFIO.Equals(model.ImplementerFIO) && x.Password.Equals(model.Password))
                ?.GetViewModel;
            }
            if (model.Id.HasValue)
            {
                return _source.Implementers
                    .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
            }
            return _source.Implementers
                .FirstOrDefault(x =>
                x.ImplementerFIO.Equals(model.ImplementerFIO))
                ?.GetViewModel;
        }

		public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
		{
            if (string.IsNullOrEmpty(model.ImplementerFIO))
            {
                return new();
            }
            return _source.Implementers
            .Where(x => x.ImplementerFIO.Equals(model.ImplementerFIO))
           .Select(x => x.GetViewModel)
           .ToList();
        }

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

		public ImplementerViewModel? Insert(ImplementerBindingModel model)
		{
            model.Id = _source.Implementers.Count > 0 ? _source.Implementers.Max(x => x.Id) + 1 : 1;
            var newImpl = Implementer.Create(model);
            if (newImpl == null)
            {
                return null;
            }
            _source.Implementers.Add(newImpl);
            _source.SaveConditions();
            return newImpl.GetViewModel;
        }

		public ImplementerViewModel? Update(ImplementerBindingModel model)
		{
            var implementer = _source.Implementers.FirstOrDefault(x => x.Id == model.Id);
            if (implementer == null)
            {
                return null;
            }
            implementer.Update(model);
            _source.SaveConditions();
            return implementer.GetViewModel;
        }
	}
}