using System;
using System.IO;
using System.Net.Http;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using ytLive.Helpers;
using ytLive.ViewModels;

namespace ytLive.Controls;

public partial class TopBar : UserControl
{
    private static readonly HttpClient AvatarHttp = new() { Timeout = TimeSpan.FromSeconds(15) };
    private string? _loadedAvatarUrl;

    public TopBar()
    {
        InitializeComponent();
        AvatarImage.Source = null;
        AvatarInitial.Visibility = System.Windows.Visibility.Collapsed;
    }

    public void RefreshAvatar()
    {
        _ = LoadAvatarImageAsync();
    }

    private async System.Threading.Tasks.Task LoadAvatarImageAsync()
    {
        var vm = DataContext as MainViewModel;
        var url = vm?.AccountAvatarUrl;
        if (vm is not { IsConnected: true })
        {
            ShowAvatarFallback(null);
            return;
        }
        if (string.IsNullOrWhiteSpace(url))
        {
            AppLog.Write("Avatar: connected but no profile image URL on the session");
            ShowAvatarFallback(null);
            return;
        }
        if (url == _loadedAvatarUrl && AvatarImage.Source != null) return;
        try
        {
            var bytes = await AvatarHttp.GetByteArrayAsync(url);
            using var ms = new MemoryStream(bytes);
            var bitmap = new BitmapImage();
            bitmap.BeginInit();
            bitmap.CacheOption = BitmapCacheOption.OnLoad;
            bitmap.StreamSource = ms;
            bitmap.EndInit();
            bitmap.Freeze();
            _loadedAvatarUrl = url;
            AvatarImage.Source = bitmap;
            AvatarInitial.Visibility = System.Windows.Visibility.Collapsed;
        }
        catch (Exception ex)
        {
            AppLog.Write($"Avatar load failed ({url}): {ex.Message}");
            ShowAvatarFallback(vm?.AccountDisplayName);
        }
    }

    private void ShowAvatarFallback(string? name)
    {
        _loadedAvatarUrl = null;
        AvatarImage.Source = null;
        AvatarInitial.Text = string.IsNullOrWhiteSpace(name) ? "?" : name.Substring(0, 1).ToUpperInvariant();
        AvatarInitial.Visibility = System.Windows.Visibility.Visible;
    }
}