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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
@interface OWSUnreadIndicator : NSObject
@property (nonatomic, readonly) BOOL hasMoreUnseenMessages;
@property (nonatomic, readonly) NSUInteger missingUnseenSafetyNumberChangeCount;
// The sortId of the oldest unseen message.
// Once we enter messages view, we mark all messages read, so we need
// a snapshot of what the first unread message was when we entered the
// view so that we can call ensureDynamicInteractionsForThread:...
// repeatedly. The unread indicator should continue to show up until
// it has been cleared, at which point hideUnreadMessagesIndicator is
// YES in ensureDynamicInteractionsForThread:...
@property (nonatomic, readonly) uint64_t firstUnseenSortId;
// The index of the unseen indicator, counting from the _end_ of the conversation
// history.
// This is used by MessageViewController to increase the
// range size of the mappings (the load window of the conversation)
// to include the unread indicator.
@property (nonatomic, readonly) NSInteger unreadIndicatorPosition;
- (instancetype)init NS_UNAVAILABLE;
- (instancetype)initWithFirstUnseenSortId:(uint64_t)firstUnseenSortId
unreadIndicatorPosition:(NSInteger)unreadIndicatorPosition NS_DESIGNATED_INITIALIZER;