Phonebook/ContactDetailPage.xaml.cs

using System.Buffers.Text;
using Phonebook.Models;
using Phonebook.Services;
using Phonebook.Utils;
using Contact = Phonebook.Models.Contact;

namespace Phonebook {

    public partial class ContactDetailPage : ContentPage
    {
        private Contact _contact;
        private DatabaseService _databaseService;

        public ContactDetailPage(Contact contact)
        {
            InitializeComponent();
            _contact = contact;
            _databaseService = new DatabaseService();
            BindingContext = _contact;

            if (!string.IsNullOrEmpty(_contact.PhotoPath))
            {
                contactImage.Source = _contact.PhotoPath;
            }

            LoadContactData();
        }

        private async void LoadContactData()
        {
            // Если контакт уже существует в БД (имеет Id)
            if (_contact.Id > 0)
            {
                // Получаем актуальные данные из базы
                var fullContact = await _databaseService.GetContactAsync(_contact.Id);
                if (fullContact != null)
                {
                    _contact = fullContact;
                }
            }

            // Привязываем данные к элементам управления
            nameEntry.Text = _contact.Name;
            phoneEntry.Text = _contact.PhoneNumber;
            descriptionEntry.Text = _contact.Description;
            addressEntry.Text = _contact.Address;
            emailEntry.Text = _contact.Email;


            if (!string.IsNullOrEmpty(_contact.PhotoBase64))
            {
                contactImage.Source = ImageHelper.Base64ToStreamImageSource(_contact.PhotoBase64);
                return;
            }

            if (!string.IsNullOrEmpty(_contact.PhotoPath))
            {
                contactImage.Source = ImageSource.FromFile(_contact.PhotoPath);
            }
            else
            {
                contactImage.Source = "default_contact.png";
            }
        }

        private async void OnSaveClicked(object sender, EventArgs e)
        {
            _contact.Name = nameEntry.Text;
            _contact.PhoneNumber = phoneEntry.Text;
            _contact.Description = descriptionEntry.Text;
            _contact.Email = emailEntry.Text;
            _contact.Address = addressEntry.Text;

            await _databaseService.SaveContactAsync(_contact);
            await Navigation.PopAsync();
        }

        private async void OnDeleteClicked(object sender, EventArgs e)
        {
            var answer = await DisplayAlert("Удаление", "Вы уверены, что хотите удалить этот контакт?", "Да", "Нет");
            if (!answer) return;
            
            await _databaseService.DeleteContactAsync(_contact);
            await Navigation.PopAsync();
        }

        private async void OnImageTapped(object sender, EventArgs e)
        {
            try
            {
                var result = await MediaPicker.PickPhotoAsync();
                if (result == null) return;
                
                var stream = await result.OpenReadAsync();
                contactImage.Source = ImageSource.FromStream(() => stream);
                    
                var saveStream = new MemoryStream();
                await (await result.OpenReadAsync()).CopyToAsync(saveStream);
                    
                var bytes = saveStream.ToArray();
                
                _contact.PhotoBase64 = Convert.ToBase64String(bytes);
                await _databaseService.SaveContactAsync(_contact);
            }
            catch (Exception ex)
            {
                await DisplayAlert("Ошибка", ex.Message, "OK");
            }
        }
    }
}