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

#import "TSAttachment.h"

NS_ASSUME_NONNULL_BEGIN

@class SSKProtoAttachmentPointer;

typedef NS_ENUM(NSUInteger, TSAttachmentPointerState) {
    TSAttachmentPointerStateEnqueued = 0,
    TSAttachmentPointerStateDownloading = 1,
    TSAttachmentPointerStateFailed = 2,
};

/**
 * A TSAttachmentPointer is a yet-to-be-downloaded attachment.
 */
@interface TSAttachmentPointer : TSAttachment

- (nullable instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;

- (instancetype)initWithServerId:(UInt64)serverId
                             key:(NSData *)key
                          digest:(nullable NSData *)digest
                       byteCount:(UInt32)byteCount
                     contentType:(NSString *)contentType
                  sourceFilename:(nullable NSString *)sourceFilename
                  attachmentType:(TSAttachmentType)attachmentType NS_DESIGNATED_INITIALIZER;

+ (TSAttachmentPointer *)attachmentPointerFromProto:(SSKProtoAttachmentPointer *)attachmentProto;

@property (atomic) TSAttachmentPointerState state;
@property (nullable, atomic) NSString *mostRecentFailureLocalizedText;

// Though now required, `digest` may be null for pre-existing records or from
// messages received from other clients
@property (nullable, nonatomic, readonly) NSData *digest;

@end

NS_ASSUME_NONNULL_END