/**
 * OCR Provider Interfaces
 * Provides optical character recognition from images and PDFs
 */
export interface OCRResult {
    /** Extracted text content */
    text: string;
    /** Confidence score (0-1) if available */
    confidence?: number;
    /** Language detected */
    language?: string;
    /** Word-level details if available */
    words?: OCRWord[];
    /** Line-level details if available */
    lines?: OCRLine[];
    /** Block-level details if available */
    blocks?: OCRBlock[];
}
export interface OCRWord {
    /** Word text */
    text: string;
    /** Confidence score (0-1) */
    confidence: number;
    /** Bounding box coordinates */
    boundingBox?: BoundingBox;
}
export interface OCRLine {
    /** Line text */
    text: string;
    /** Confidence score (0-1) */
    confidence?: number;
    /** Words in this line */
    words?: OCRWord[];
    /** Bounding box coordinates */
    boundingBox?: BoundingBox;
}
export interface OCRBlock {
    /** Block text */
    text: string;
    /** Block type (paragraph, heading, etc.) */
    type?: string;
    /** Confidence score (0-1) */
    confidence?: number;
    /** Lines in this block */
    lines?: OCRLine[];
    /** Bounding box coordinates */
    boundingBox?: BoundingBox;
}
export interface BoundingBox {
    x: number;
    y: number;
    width: number;
    height: number;
}
export interface OCRConfig {
    /** Language hints (e.g., 'eng', 'fra', 'deu') */
    languages?: string[];
    /** OCR engine mode (if applicable) */
    engineMode?: number;
    /** Page segmentation mode (if applicable) */
    pageSegMode?: number;
    /** Custom configuration options */
    customConfig?: Record<string, any>;
}
/**
 * OCR Provider types
 */
export declare enum OCRProvider {
    TESSERACT = "tesseract",
    GOOGLE_VISION = "google-vision",
    AZURE_COMPUTER_VISION = "azure-computer-vision"
}
/**
 * Base OCR Provider interface
 */
export interface IOCRProvider {
    /** Provider name */
    readonly name: string;
    /** Check if provider is available (dependencies installed) */
    isAvailable(): Promise<boolean>;
    /**
     * Extract text from image buffer
     */
    extractText(image: Buffer, config?: OCRConfig): Promise<OCRResult>;
    /**
     * Extract text from image file
     */
    extractTextFromFile(imagePath: string, config?: OCRConfig): Promise<OCRResult>;
    /**
     * Extract text from multiple images
     */
    extractTextFromImages(images: Buffer[], config?: OCRConfig): Promise<OCRResult[]>;
}
/**
 * OCR Fallback configuration
 */
export interface OCRFallbackConfig {
    /** Enable OCR fallback */
    enabled: boolean;
    /** OCR provider to use */
    provider: OCRProvider | string;
    /** When to use OCR fallback */
    trigger?: 'always' | 'on-error' | 'low-confidence';
    /** Minimum confidence threshold for vision model (0-1) */
    minConfidenceThreshold?: number;
    /** OCR configuration */
    ocrConfig?: OCRConfig;
    /** Combine OCR with vision model results */
    combineResults?: boolean;
}
/**
 * Combined result from vision model + OCR
 */
export interface CombinedResult {
    /** Vision model result */
    visionResult: string;
    /** OCR result */
    ocrResult: OCRResult;
    /** Combined/merged text */
    combinedText: string;
    /** Source used: 'vision', 'ocr', or 'combined' */
    source: 'vision' | 'ocr' | 'combined';
}
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