corp-app/CORP-MAUI/Pages/PostDetailsPage.xaml.cs

using System.Diagnostics;
using CORP_MAUI.Models;
using CORP_MAUI.ViewModels;

namespace CORP_MAUI.Pages;

public partial class PostDetailsPage : ContentPage
{
    private readonly PostDetailsViewModel _viewModel;

    public PostDetailsPage(PostViewModel postViewModel)
    {
        InitializeComponent();
        _viewModel = new PostDetailsViewModel(postViewModel);
        BindingContext = _viewModel;
        
        // Предзагружаем аватар автора поста
        _ = PreloadPostAuthorAvatarAsync();
    }

    protected override async void OnAppearing()
    {
        base.OnAppearing();
        if (_viewModel.Comments.Count == 0)
        {
            await LoadCommentsAsync();
        }
    }

    private async Task LoadCommentsAsync()
    {
        _viewModel.IsLoadingComments = true;
        try
        {
            PaginatedResponse<Comment> response = await ServiceProvider.ApiService.GetCommentsPaginatedAsync(postId: _viewModel.PostViewModel.Post.Id);
            
            _viewModel.Comments.Clear();
            if (response.Results != null)
            {
                foreach (Comment comment in response.Results)
                {
                    _viewModel.Comments.Add(comment);
                }
                
                // Предзагружаем аватары авторов комментариев
                _ = PreloadCommentAuthorsAvatarsAsync();
            }
        }
        catch (Exception ex)
        {
            Trace.WriteLine($"[PostDetailsPage] Error loading comments: {ex.Message}");
        }
        finally
        {
            _viewModel.IsLoadingComments = false;
        }
    }
    
    private async Task PreloadPostAuthorAvatarAsync()
    {
        try
        {
            var author = _viewModel.PostViewModel.Post.Author;
            if (author != null)
            {
                await ServiceProvider.ApiService.LoadUserAvatarAsync(author);
            }
        }
        catch (Exception ex)
        {
            Trace.WriteLine($"[PostDetailsPage] Ошибка предзагрузки аватара автора: {ex.Message}");
        }
    }
    
    private async Task PreloadCommentAuthorsAvatarsAsync()
    {
        try
        {
            var authors = _viewModel.Comments
                .Where(c => c.Author != null)
                .Select(c => c.Author!)
                .Distinct()
                .ToList();
                
            if (authors.Count > 0)
            {
                await ServiceProvider.ApiService.PreloadUserAvatarsAsync(authors);
                
                // Обновляем UI - переустанавливаем ItemsSource
                await MainThread.InvokeOnMainThreadAsync(() =>
                {
                    CommentsCollectionView.ItemsSource = null;
                    CommentsCollectionView.ItemsSource = _viewModel.Comments;
                });
            }
        }
        catch (Exception ex)
        {
            Trace.WriteLine($"[PostDetailsPage] Ошибка предзагрузки аватаров комментаторов: {ex.Message}");
        }
    }

    private async void OnCloseClicked(object sender, EventArgs e)
    {
        await Navigation.PopAsync();
    }
}