deleteMyReaction method

Message deleteMyReaction({ String? reactionType, })

Deletes all the current user's reactions from the message.

Optionally, you can specify a reactionType to delete only that specific current user's reaction.

Implementation

Message deleteMyReaction({
  String? reactionType,
}) {
  final reactionsToDelete = this.ownReactions?.where((it) {
    if (reactionType != null) return it.type == reactionType;
    return true;
  });

  // If there are no reactions to delete, we can return the message as is.
  if (reactionsToDelete == null || reactionsToDelete.isEmpty) return this;

  final ownReactions = <Reaction>[...?this.ownReactions];
  final latestReactions = <Reaction>[...?this.latestReactions];
  final reactionGroups = <String, ReactionGroup>{...?this.reactionGroups};

  for (final reaction in reactionsToDelete) {
    final type = reaction.type;

    bool match(Reaction r) => r.type == type && r.userId == reaction.userId;

    // Remove from own reactions and latest reactions.
    ownReactions.removeWhere(match);
    latestReactions.removeWhere(match);

    final group = reactionGroups.remove(type);
    if (group == null) continue;

    // Update the reaction group.
    final updatedCount = group.count - 1;
    final updatedSumScores = group.sumScores - reaction.score;

    if (updatedCount > 0 && updatedSumScores > 0) {
      reactionGroups[type] = group.copyWith(
        count: updatedCount,
        sumScores: updatedSumScores,
      );
    }
  }

  return copyWith(
    ownReactions: ownReactions,
    latestReactions: latestReactions,
    reactionGroups: reactionGroups,
  );
}