@page "/"
@inject NavigationManager navManager
@using SpotifyAPI.Web

<h1>Hello, world!</h1>

@if (_isAuthed && _me != null)
{
  <h2>Welcome @_me.DisplayName!</h2>
  <p>
    You have a grant toal of @_totalPlaylistCount playlists!
  </p>
}
else
{
  <span>To get started:</span>
  <a href="@_authUri">
    Login via Spotify
  </a>
}

@code {
    private Uri _authUri;

    private bool _isAuthed;

    private PrivateUser _me;

    private int _totalPlaylistCount;

    protected override void OnInitialized()
    {
      var clientId = Environment.GetEnvironmentVariable("SPOTIFY_CLIENT_ID");
      var baseUri = navManager.ToAbsoluteUri(navManager.BaseUri);

      var loginRequest = new LoginRequest(baseUri, clientId, LoginRequest.ResponseType.Token)
      {
        Scope = new[] { Scopes.PlaylistReadPrivate, Scopes.PlaylistReadCollaborative }
      };
      _authUri = loginRequest.ToUri();
    }

    protected override async Task OnInitializedAsync()
    {
      var uri = new Uri(navManager.Uri);
      var maxLen = Math.Min(1, uri.Fragment.Length);
      Dictionary<string, string> fragmentParams = uri.Fragment.Substring(maxLen)
        ?.Split("&", StringSplitOptions.RemoveEmptyEntries)
        ?.Select(param => param.Split("=", StringSplitOptions.RemoveEmptyEntries))
        ?.ToDictionary(param => param[0], param => param[1]) ?? new Dictionary<string, string>();

      _isAuthed = fragmentParams.ContainsKey("access_token");
      if (_isAuthed)
      {
        var spotify = new SpotifyClient(fragmentParams["access_token"]);

        _me = await spotify.UserProfile.Current();
        _totalPlaylistCount = (await spotify.Playlists.CurrentUsers()).Total;
      }
    }
}