using System;
using System.Collections.Generic;
using System.MedicationModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using VeterinaryClinicContracts.BindingModels;
using VeterinaryClinicContracts.SearchModels;
using VeterinaryClinicContracts.StorageContracts;
using VeterinaryClinicContracts.ViewModels;
using VeterinaryClinicDatabaseImplement.Models;

namespace VeterinaryClinicDatabaseImplement.Implements
{
    public class MedicationStorage : IMedicationStorage
    {
        public MedicationViewModel? Delete(MedicationBindingModel model)
        {
            using var context = new VeterinaryClinicDatabase();
            var element = context.Medications.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Medications.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public MedicationViewModel? GetElement(MedicationSearchModel model)
        {
            if (string.IsNullOrEmpty(model.MedicationName) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new VeterinaryClinicDatabase();
            return context.Medications
            .FirstOrDefault(x =>
           (!string.IsNullOrEmpty(model.MedicationName) && x.MedicationName == model.MedicationName) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }

        public List<MedicationViewModel> GetFilteredList(MedicationSearchModel model)
        {
            if (string.IsNullOrEmpty(model.MedicationName))
            {
                return new();
            }
            using var context = new VeterinaryClinicDatabase();
            return context.Medications
            .Where(x => x.MedicationName.Contains(model.MedicationName))
           .Select(x => x.GetViewModel)
           .ToList();
        }

        public List<MedicationViewModel> GetFullList()
        {
            using var context = new VeterinaryClinicDatabase();
            return context.Medications
            .Select(x => x.GetViewModel)
           .ToList();
        }

        public MedicationViewModel? Insert(MedicationBindingModel model)
        {
            var newMedication = Medication.Create(model);
            if (newMedication == null)
            {
                return null;
            }
            using var context = new VeterinaryClinicDatabase();
            context.Medications.Add(newMedication);
            context.SaveChanges();
            return newMedication.GetViewModel;
        }

        public MedicationViewModel? Update(MedicationBindingModel model)
        {
            using var context = new Database();
            var Medication = context.Medications.FirstOrDefault(x => x.Id ==
           model.Id);
            if (Medication == null)
            {
                return null;
            }
            Medication.Update(model);
            context.SaveChanges();
            return Medication.GetViewModel;
        }
    }
}