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


namespace TravelCompanyFileImplement.Implements
{
    public class ConditionStorage : IConditionStorage
    {
        private readonly DataFileSingleton source;
        public ConditionStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<ConditionViewModel> GetFullList()
        {
            return source.Conditions
            .Select(x => x.GetViewModel)
           .ToList();
        }
        public List<ConditionViewModel> GetFilteredList(ConditionSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ConditionName))
            {
                return new();
            }
            return source.Conditions
            .Where(x => x.ConditionName.Contains(model.ConditionName))
           .Select(x => x.GetViewModel)
           .ToList();
        }
        public ConditionViewModel? GetElement(ConditionSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ConditionName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Conditions.FirstOrDefault(x =>(!string.IsNullOrEmpty(model.ConditionName) && x.ConditionName ==model.ConditionName) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }
        public ConditionViewModel? Insert(ConditionBindingModel model)
        {
            model.Id = source.Conditions.Count > 0 ? source.Conditions.Max(x =>x.Id) + 1 : 1;
            var newCondition = Condition.Create(model);
            if (newCondition == null)
            {
                return null;
            }
            source.Conditions.Add(newCondition);
            source.SaveConditions();
            return newCondition.GetViewModel;
        }
        public ConditionViewModel? Update(ConditionBindingModel model)
        {
            var condition = source.Conditions.FirstOrDefault(x => x.Id ==model.Id);
            if (condition == null)
            {
                return null;
            }
            condition.Update(model);
            source.SaveConditions();
            return condition.GetViewModel;
        }
        public ConditionViewModel? Delete(ConditionBindingModel model)
        {
            var element = source.Conditions.FirstOrDefault(x => x.Id ==model.Id);
            if (element != null)
            {
                source.Conditions.Remove(element);
                source.SaveConditions();
                return element.GetViewModel;
            }
            return null;
        }
    }
}