/**
 * Platform-agnostic block content store abstraction for BrightChat services.
 *
 * This interface lives in brightchain-lib so that ConversationService,
 * GroupService, and ChannelService can delegate message content storage
 * to the block-based architecture without importing Node.js-specific
 * dependencies (MessageCBLService, GossipService, IBlockStore).
 *
 * A concrete implementation (BlockContentStoreAdapter) is provided at
 * construction time from application.ts in brightchain-api-lib, which
 * delegates to MessageCBLService for block storage and GossipService
 * for decentralized distribution.
 *
 * When no store is injected (e.g. in unit tests), services fall back
 * to their existing direct-storage behavior.
 *
 * Requirements: 2.1, 2.2, 2.3, 2.4, 2.5
 */
/**
 * Abstraction over block-based content storage and retrieval.
 *
 * Implementations are responsible for:
 *   1. Splitting content into blocks and persisting them
 *   2. Announcing blocks via gossip for decentralized distribution
 *   3. Returning a block reference (magnet URL) that can be stored
 *      in `ICommunicationMessage.encryptedContent` instead of raw content
 */
export interface IBlockContentStore {
    /**
     * Store content as blocks, announce via gossip, and return a reference.
     *
     * @param content    - The message content to store (text or binary)
     * @param senderId   - ID of the member sending the content
     * @param recipientIds - IDs of the intended recipients
     * @returns A block reference (magnet URL) that can later be used
     *          with {@link retrieveContent} to reconstruct the content
     */
    storeContent(content: Uint8Array | string, senderId: string, recipientIds: string[]): Promise<{
        blockReference: string;
    }>;
    /**
     * Retrieve content from the block store by its reference.
     *
     * @param blockReference - The magnet URL / block reference returned
     *                         by {@link storeContent}
     * @returns The original content bytes, or null if the blocks are
     *          no longer available
     */
    retrieveContent(blockReference: string): Promise<Uint8Array | null>;
    /**
     * Remove content blocks from the block store.
     *
     * @param blockReference - The magnet URL / block reference to delete
     */
    deleteContent(blockReference: string): Promise<void>;
}
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