/**
 * R2Adapter - Cloudflare R2 storage adapter
 * Optimized for blob storage, large objects, and cold tier data
 */
import { BlobAdapter, StorageResult, PerformanceMetrics, AdapterConfig } from '../interfaces/storage-engine';
export interface R2Config extends AdapterConfig {
    bucket: R2Bucket;
    defaultCacheControl: string;
    maxObjectSize: number;
    enableMultipartThreshold: number;
    compressionEnabled: boolean;
    enableChecksums: boolean;
    customMetadataLimit: number;
}
export interface R2ObjectMetadata {
    contentType?: string;
    contentEncoding?: string;
    cacheControl?: string;
    contentDisposition?: string;
    contentLanguage?: string;
    expires?: string;
    customMetadata?: Record<string, string>;
    checksums?: {
        md5?: string;
        sha1?: string;
        sha256?: string;
    };
}
export interface R2ListResult {
    objects: Array<{
        key: string;
        size: number;
        etag: string;
        lastModified: Date;
        storageClass?: string;
        checksums?: Record<string, string>;
    }>;
    truncated: boolean;
    continuationToken?: string;
}
export declare class R2Adapter implements BlobAdapter {
    readonly backend = "r2";
    private r2;
    private config;
    private metrics;
    private uploadProgressCallbacks;
    constructor(config: R2Config);
    initialize(): Promise<void>;
    destroy(): Promise<void>;
    health(): Promise<boolean>;
    getMetrics(): Promise<PerformanceMetrics>;
    put(key: string, data: ArrayBuffer | Uint8Array, metadata?: Record<string, string>): Promise<StorageResult<string>>;
    get(key: string): Promise<StorageResult<{
        data: ArrayBuffer;
        metadata?: Record<string, string>;
    }>>;
    delete(key: string): Promise<StorageResult<boolean>>;
    list(prefix?: string, limit?: number): Promise<StorageResult<Array<{
        key: string;
        size: number;
        lastModified: Date;
    }>>>;
    head(key: string): Promise<StorageResult<{
        size: number;
        etag: string;
        lastModified: Date;
        metadata?: Record<string, string>;
    }>>;
    getRange(key: string, start: number, end: number): Promise<StorageResult<{
        data: ArrayBuffer;
        totalSize: number;
    }>>;
    putMany(objects: Array<{
        key: string;
        data: ArrayBuffer | Uint8Array;
        metadata?: Record<string, string>;
    }>): Promise<StorageResult<string[]>>;
    deleteMany(keys: string[]): Promise<StorageResult<number>>;
    putDocument(collection: string, id: string, document: any, compress?: boolean): Promise<StorageResult<string>>;
    putVector(collection: string, id: string, vector: Float32Array, metadata?: any): Promise<StorageResult<string>>;
    putTimeSeries(metric: string, timeRange: string, data: ArrayBuffer): Promise<StorageResult<string>>;
    private validateKey;
    private validateObjectSize;
    private preprocessData;
    private postprocessData;
    private buildR2Metadata;
    private extractMetadata;
    private isHttpMetadata;
    private putMultipart;
    private chunkArray;
    private updateMetrics;
    private createStorageError;
    private isRetryableError;
}
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