#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@protocol UITextDocumentProxy;

@interface KBInputBufferManager : NSObject

+ (instancetype)shared;

@property (nonatomic, copy, readonly) NSString *liveText;
@property (nonatomic, copy, readonly) NSString *manualSnapshot;
@property (nonatomic, copy, readonly) NSString *pendingClearSnapshot;

- (void)seedIfEmptyWithContextBefore:(nullable NSString *)before after:(nullable NSString *)after;
- (void)updateFromExternalContextBefore:(nullable NSString *)before after:(nullable NSString *)after;
- (void)refreshFromProxyIfPossible:(nullable id<UITextDocumentProxy>)proxy;
- (void)prepareSnapshotForDeleteWithContextBefore:(nullable NSString *)before
                                            after:(nullable NSString *)after;
- (void)beginPendingClearSnapshot;
- (void)clearPendingClearSnapshot;
- (void)resetWithText:(NSString *)text;
- (void)appendText:(NSString *)text;
- (void)deleteBackwardByCount:(NSUInteger)count;
- (void)replaceTailWithText:(NSString *)text deleteCount:(NSUInteger)count;
- (void)applyHoldDeleteCount:(NSUInteger)count;
- (void)applyClearDeleteCount:(NSUInteger)count;
- (void)clearAllLiveText;
- (void)commitLiveToManual;
- (void)restoreManualSnapshot;

@end

NS_ASSUME_NONNULL_END