//
//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
//

NS_ASSUME_NONNULL_BEGIN

@interface OWSUnreadIndicator : NSObject

@property (nonatomic, readonly) uint64_t timestamp;

@property (nonatomic, readonly) BOOL hasMoreUnseenMessages;

@property (nonatomic, readonly) NSUInteger missingUnseenSafetyNumberChangeCount;

@property (nonatomic, readonly) uint64_t firstUnseenInteractionTimestamp;

// 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)initUnreadIndicatorWithTimestamp:(uint64_t)timestamp
                           hasMoreUnseenMessages:(BOOL)hasMoreUnseenMessages
            missingUnseenSafetyNumberChangeCount:(NSUInteger)missingUnseenSafetyNumberChangeCount
                         unreadIndicatorPosition:(NSInteger)unreadIndicatorPosition
                 firstUnseenInteractionTimestamp:(uint64_t)firstUnseenInteractionTimestamp NS_DESIGNATED_INITIALIZER;

@end

NS_ASSUME_NONNULL_END