import { StorageInterface, StorageOptions } from './types';
/**
 * Local file system storage implementation
 */
export declare class LocalStorage implements StorageInterface {
    private storagePath;
    private isFileProtocol;
    /**
     * Initialize local storage
     *
     * @param storagePath Storage path
     * @param isFileProtocol Whether to use file protocol for resource URIs
     */
    constructor(storagePath: string, isFileProtocol: boolean);
    /**
     * Get file path for a thread and sheet
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns File path
     */
    private getFilePath;
    /**
     * Save CSV content to local file
     *
     * @param threadId Quip document thread ID
     * @param csvContent CSV content
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to file path
     */
    saveCSV(threadId: string, csvContent: string, sheetName?: string): Promise<string>;
    /**
     * Get CSV content from local file
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to CSV content, or null if file doesn't exist
     */
    getCSV(threadId: string, sheetName?: string): Promise<string | null>;
    /**
     * Get resource URI
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Resource URI
     */
    getResourceURI(threadId: string, sheetName?: string): string;
    /**
     * Get metadata for the stored CSV
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to metadata including total_rows, total_size, etc.
     */
    getMetadata(threadId: string, sheetName?: string): Promise<Record<string, any>>;
    /**
     * Get cache key for a thread and sheet
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Cache key
     */
    private getCacheKey;
}
/**
 * S3 storage implementation
 */
export declare class S3Storage implements StorageInterface {
    private s3Client;
    private bucket;
    private prefix;
    private urlExpiration;
    /**
     * Initialize S3 storage
     *
     * @param bucket S3 bucket name
     * @param region S3 region
     * @param prefix S3 object key prefix (optional)
     * @param urlExpiration URL expiration in seconds (default: 3600)
     */
    constructor(bucket: string, region: string, prefix?: string, urlExpiration?: number);
    /**
     * Get S3 object key for a thread and sheet
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns S3 object key
     */
    private getObjectKey;
    /**
     * Save CSV content to S3
     *
     * @param threadId Quip document thread ID
     * @param csvContent CSV content
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to S3 object key
     */
    saveCSV(threadId: string, csvContent: string, sheetName?: string): Promise<string>;
    /**
     * Get CSV content from S3
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to CSV content, or null if object doesn't exist
     */
    /**
     * Send a command to S3
     *
     * @param command Command to send
     * @returns Promise resolving to command response
     */
    protected sendCommand(command: any): Promise<any>;
    getCSV(threadId: string, sheetName?: string): Promise<string | null>;
    /**
     * Get resource URI
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Resource URI (presigned S3 URL or s3:// URI)
     */
    getResourceURI(threadId: string, sheetName?: string): string;
    /**
     * Generate a presigned URL for accessing the S3 object
     * This is a new method that can be used when an actual presigned URL is needed
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to a presigned URL
     */
    generatePresignedUrl(threadId: string, sheetName?: string): Promise<string>;
    /**
     * Get metadata for the stored CSV
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Promise resolving to metadata including total_rows, total_size, etc.
     */
    getMetadata(threadId: string, sheetName?: string): Promise<Record<string, any>>;
    /**
     * Get cache key for a thread and sheet
     *
     * @param threadId Quip document thread ID
     * @param sheetName Sheet name (optional)
     * @returns Cache key
     */
    private getCacheKey;
}
/**
 * Truncate CSV content to be under the specified maximum size while maintaining valid CSV structure
 *
 * @param csvContent Original CSV content
 * @param maxSize Maximum size in bytes (default: 10KB)
 * @returns Tuple of truncated CSV content and a boolean indicating if truncation occurred
 */
export declare function truncateCSVContent(csvContent: string, maxSize?: number): [string, boolean];
/**
 * Factory function to create storage instance
 *
 * @param storageType Storage type, supports "local" and "s3"
 * @param options Parameters passed to storage constructor
 * @returns Storage instance
 * @throws Error if storage type is not supported
 */
export declare function createStorage(storageType: string, options: StorageOptions): StorageInterface;