/**
 * In-Memory Email Metadata Store
 *
 * Implements IEmailMetadataStore with in-memory storage for email metadata.
 * Provides filtering, sorting, pagination, read tracking, and full-text search.
 *
 * @see Requirement 13.1 - Inbox query for To, Cc, or Bcc recipients
 * @see Requirement 13.2 - Sort by Date header (newest first by default)
 * @see Requirement 13.3 - Filter by read/unread, sender, date range, etc.
 * @see Requirement 13.4 - Full-text search across subject and body
 * @see Requirement 13.6 - Pagination with configurable page size
 * @see Requirement 13.7 - Sort by date, sender, subject, size
 * @see Requirement 13.8 - Track and return unread count
 */
import type { IEmailMetadata } from '../../interfaces/messaging/emailMetadata';
import type { IEmailMetadataStore, IInboxQuery, IInboxResult } from './emailMessageService';
export declare class InMemoryEmailMetadataStore implements IEmailMetadataStore {
    private readonly emails;
    /** Set of "messageId::userId" keys for read tracking */
    private readonly readSet;
    /** Attachment content keyed by checksum */
    private readonly attachmentContents;
    /** Maps userId (memberId GUID) → email address for inbox lookups */
    private readonly userEmailMap;
    /**
     * Register a mapping from userId (memberId GUID) to email address.
     * This allows inbox queries by memberId to resolve to the correct email.
     */
    registerUserEmail(userId: string, email: string): void;
    /**
     * Resolve a userId to an email address.
     * If the userId is already an email (contains @), returns it as-is.
     * Otherwise looks up the userEmailMap for a memberId → email mapping.
     */
    private resolveUserEmail;
    store(metadata: IEmailMetadata): Promise<void>;
    get(messageId: string): Promise<IEmailMetadata | null>;
    delete(messageId: string): Promise<void>;
    update(messageId: string, updates: Partial<IEmailMetadata>): Promise<void>;
    /**
     * Query emails for a user's inbox.
     *
     * Returns emails where the user (identified by email address) is a
     * To, Cc, or Bcc recipient. Supports filtering, sorting, and pagination.
     *
     * @see Requirement 13.1 - Inbox query for To, Cc, or Bcc recipients
     */
    queryInbox(userId: string, query: IInboxQuery): Promise<IInboxResult>;
    getUnreadCount(userId: string): Promise<number>;
    markAsRead(messageId: string, userId: string): Promise<void>;
    getThread(messageId: string): Promise<IEmailMetadata[]>;
    getRootMessage(messageId: string): Promise<IEmailMetadata | null>;
    private readKey;
    /**
     * Check if userId (email address) is a To, Cc, or Bcc recipient.
     */
    private isRecipient;
    private applyFilters;
    /**
     * Full-text search: checks subject and body content (text parts).
     * @see Requirement 13.4
     */
    private matchesSearch;
    private partContainsText;
    private sortEmails;
    /** Check if a user has read a specific email */
    isRead(messageId: string, userId: string): boolean;
    /** Get total stored email count (for testing) */
    get count(): number;
    storeAttachmentContent(key: string, content: Uint8Array): Promise<void>;
    getAttachmentContent(key: string): Promise<Uint8Array | null>;
}
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