import type { PdfElement } from '../../models/PdfElement.js';
/**
 * Pure decision logic for whether a page should be collapsed to a single
 * full-page screenshot element (covers and full-page advertisements) instead of
 * being decomposed into text + images.
 *
 * The key discriminator is the LONGEST continuous text block, not the total text
 * length: a genuine editorial page has at least one long paragraph, whereas a
 * full-page ad only has short scattered promo fragments (headline, tagline,
 * bullets, legal line). The old "total text >= 200 chars" guard fired on those
 * scattered fragments and wrongly kept text-heavy ads as decomposed pages.
 */
export interface ScreenshotThresholds {
    /** Single/aggregate image coverage that marks a full-page visual. Default 0.8. */
    coverPageThreshold: number;
    /** Hero-image coverage that flags an ad even when it also carries text. Default 0.55. */
    heroImageCoverageThreshold: number;
    /** Longest continuous text block that marks real editorial content. Default 300. */
    significantTextBlockThreshold: number;
    /** Max total text for a hero-image ad (above this it is treated as content). Default 600. */
    adMaxTextChars: number;
    /**
     * Min distinct text elements for the editorial-guard exemption. Ads scatter
     * their copy across many boxes (headline, body, CTA, legal line, URL);
     * a photo-editorial page has only a title + caption + credit. Default 5.
     */
    adMinTextFragments: number;
}
export declare const DEFAULT_SCREENSHOT_THRESHOLDS: ScreenshotThresholds;
export interface ScreenshotInput {
    pageWidth: number;
    pageHeight: number;
    elements: PdfElement[];
}
export interface ScreenshotDecision {
    convert: boolean;
    reason: string;
}
export declare function decideScreenshot(input: ScreenshotInput, thresholds?: ScreenshotThresholds): ScreenshotDecision;
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