Connected.Components/Components/Snackbar/SnackBarMessageState.cs

//Copyright(c) Alessandro Ghidini.All rights reserved.
//Changes and improvements Copyright (c) The MudBlazor Team.

using System.Diagnostics;
using static System.String;

namespace Connected.Components;

internal class SnackBarMessageState
{
   private string AnimationId { get; }
   public bool UserHasInteracted { get; set; }
   public SnackbarOptions Options { get; }
   public SnackbarState SnackbarState { get; set; }
   public Stopwatch Stopwatch { get; } = new Stopwatch();

   public SnackBarMessageState(SnackbarOptions options)
   {
      Options = options;
      AnimationId = $"snackbar-{Guid.NewGuid()}";
      SnackbarState = SnackbarState.Init;
   }
   private string Opacity => ((decimal)Options.MaximumOpacity / 100).ToPercentage();

   public bool ShowActionButton => !IsNullOrWhiteSpace(Options.Action);
   public bool ShowCloseIcon => Options.ShowCloseIcon;

   public bool HideIcon => Options.HideIcon;
   public string Icon => Options.Icon;
   public ThemeColor IconColor => Options.IconColor;
   public Size IconSize => Options.IconSize;

   public string ProgressBarStyle
   {
      get
      {
         var duration = RemainingTransitionMilliseconds(Options.VisibleStateDuration);
         return $"width:100;animation:{AnimationId} {duration}ms;";
      }
   }

   public string AnimationStyle
   {
      get
      {
         const string Template = "opacity: {0}; animation: {1}ms linear {2};";

         switch (SnackbarState)
         {
            case SnackbarState.Showing:
               var showingDuration = RemainingTransitionMilliseconds(Options.ShowTransitionDuration);
               return Format(Template, Opacity, showingDuration, AnimationId);

            case SnackbarState.Hiding:
               var hidingDuration = RemainingTransitionMilliseconds(Options.HideTransitionDuration);
               return Format(Template, 0, hidingDuration, AnimationId);

            case SnackbarState.Visible:
               return $"opacity: {Opacity};";

            default:
               return Empty;
         }
      }
   }

   public string SnackbarClass
   {
      get
      {
         var result = $"mud-snackbar {Options.SnackbarTypeClass}";

         if (Options.Onclick != null && !ShowActionButton)
            result += " force-cursor";

         return result;
      }
   }

   public string TransitionClass
   {
      get
      {
         var template = "@keyframes " + AnimationId + " {{from{{ {0}: {1}; }} to{{ {0}: {2}; }}}}";

         return SnackbarState switch
         {
            SnackbarState.Showing => Format(template, "opacity", "0%", Opacity),
            SnackbarState.Hiding => Format(template, "opacity", Opacity, "0%"),
            SnackbarState.Visible => Format(template, "width", "100%", "0%"),
            _ => Empty,
         };
      }
   }

   private int RemainingTransitionMilliseconds(int transitionDuration)
   {
      var duration = transitionDuration - (int)Stopwatch.ElapsedMilliseconds;

      return duration >= 0 ? duration : 0;
   }
}