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 TravelCompanyDatabaseImplement.Models;

namespace TravelCompanyDatabaseImplement.Implements
{
    public class ConditionStorage : IConditionStorage
    {
            public List<ConditionViewModel> GetFullList()
            {
                using var context = new TravelCompanyDatabase();
                return context.Conditions
                        .Select(x => x.GetViewModel)
                        .ToList();
            }

            public List<ConditionViewModel> GetFilteredList(ConditionSearchModel model)
            {
                if (string.IsNullOrEmpty(model.ConditionName))
                {
                    return new();
                }
                using var context = new TravelCompanyDatabase();
                return context.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;
                }
                using var context = new TravelCompanyDatabase();
                return context.Conditions
                        .FirstOrDefault(x => (!string.IsNullOrEmpty(model.ConditionName) && x.ConditionName == model.ConditionName) ||
                                            (model.Id.HasValue && x.Id == model.Id))
                        ?.GetViewModel;
            }

            public ConditionViewModel? Insert(ConditionBindingModel model)
            {
                var newCondition = Condition.Create(model);
                if (newCondition == null)
                {
                    return null;
                }
                using var context = new TravelCompanyDatabase();
                context.Conditions.Add(newCondition);
                context.SaveChanges();
                return newCondition.GetViewModel;
            }

            public ConditionViewModel? Update(ConditionBindingModel model)
            {
                using var context = new TravelCompanyDatabase();
                var condition = context.Conditions.FirstOrDefault(x => x.Id == model.Id);
                if (condition == null)
                {
                    return null;
                }
                condition.Update(model);
                context.SaveChanges();
                return condition.GetViewModel;
            }

            public ConditionViewModel? Delete(ConditionBindingModel model)
            {
                using var context = new TravelCompanyDatabase();
                var element = context.Conditions.FirstOrDefault(rec => rec.Id == model.Id);
                if (element != null)
                {
                    context.Conditions.Remove(element);
                    context.SaveChanges();
                    return element.GetViewModel;
                }
                return null;
            }
        }
    }