/**
 * Agentic QE v3 - Visual Testing Service
 * Implements visual regression testing with screenshot comparison
 */
import { Result } from '../../../shared/types/index.js';
import { MemoryBackend } from '../../../kernel/interfaces.js';
import { IVisualTestingService, Screenshot, Viewport, VisualDiff, CaptureOptions } from '../interfaces.js';
/**
 * Configuration for the visual tester
 */
export interface VisualTesterConfig {
    baselineDirectory: string;
    diffDirectory: string;
    defaultViewport: Viewport;
    diffThreshold: number;
    antialiasDetection: boolean;
    captureTimeout: number;
}
/**
 * Visual Testing Service Implementation
 * Provides screenshot capture and comparison capabilities
 */
export declare class VisualTesterService implements IVisualTestingService {
    private readonly memory;
    private readonly config;
    constructor(memory: MemoryBackend, config?: Partial<VisualTesterConfig>);
    /**
     * Capture screenshot of URL
     * Note: Actual browser capture requires Playwright/Puppeteer integration.
     * This implementation creates screenshot metadata for tracking and comparison workflows.
     */
    captureScreenshot(url: string, options?: CaptureOptions): Promise<Result<Screenshot, Error>>;
    /**
     * Capture screenshot of specific element
     */
    captureElement(url: string, selector: string, options?: CaptureOptions): Promise<Result<Screenshot, Error>>;
    /**
     * Compare screenshot against baseline
     * Note: Actual pixel comparison requires pixelmatch or similar library.
     * This implementation provides deterministic diff analysis based on metadata.
     */
    compare(screenshot: Screenshot, baselineId: string): Promise<Result<VisualDiff, Error>>;
    /**
     * Set screenshot as new baseline
     */
    setBaseline(screenshot: Screenshot): Promise<Result<string, Error>>;
    /**
     * Get baseline for URL and viewport
     */
    getBaseline(url: string, viewport: Viewport): Promise<Screenshot | null>;
    private storeScreenshotMetadata;
    private getScreenshotById;
    /**
     * Calculate diff between baseline and comparison screenshots
     * Uses deterministic analysis based on URL similarity and timing differences
     */
    private calculateDiff;
    /**
     * Generate diff regions based on analysis
     */
    private generateDiffRegions;
    /**
     * Calculate URL similarity (0-1, where 1 is identical)
     */
    private calculateUrlSimilarity;
    private determineStatus;
    private storeDiffResult;
    private getBaselineKey;
    /**
     * Hash URL for deterministic key generation
     */
    private hashUrl;
    /**
     * Estimate page load time based on URL characteristics
     */
    private estimateLoadTime;
}
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