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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
#import <Foundation/Foundation.h>
extern NSString *const kAttachmentDownloadProgressNotification;
extern NSString *const kAttachmentDownloadProgressKey;
extern NSString *const kAttachmentDownloadAttachmentIDKey;
@class SNProtoAttachmentPointer;
@class TSAttachment;
@class TSAttachmentPointer;
@class TSAttachmentStream;
@class TSMessage;
@class YapDatabaseReadTransaction;
@class YapDatabaseReadWriteTransaction;
#pragma mark -
* Given incoming attachment protos, determines which we support.
* It can download those that we support and notifies threads when it receives unsupported attachments.
@interface OWSAttachmentDownloads : NSObject
- (nullable NSNumber *)downloadProgressForAttachmentId:(NSString *)attachmentId;
// This will try to download all un-downloaded attachments for a given message.
// Any attachments for the message which are already downloaded are skipped BUT
// they are included in the success callback.
// success/failure are always called on a worker queue.
- (void)downloadAttachmentsForMessage:(TSMessage *)message
transaction:(YapDatabaseReadTransaction *)transaction
success:(void (^)(NSArray<TSAttachmentStream *> *attachmentStreams))success
failure:(void (^)(NSError *error))failure;
// This will try to download a single attachment.
// success/failure are always called on a worker queue.
- (void)downloadAttachmentPointer:(TSAttachmentPointer *)attachmentPointer
success:(void (^)(NSArray<TSAttachmentStream *> *attachmentStreams))success
failure:(void (^)(NSError *error))failure;
- (void)continueDownloadIfPossible;