import { z } from "zod";
import type { AgentTool } from "@kenkaiiii/gg-agent";
import { type ExtractedFrame } from "../core/frames.js";
import { type ShotScore } from "../core/vision.js";
declare const ComposeThumbnailVariantsParams: z.ZodObject<{
    input: z.ZodString;
    outputDir: z.ZodString;
    text: z.ZodString;
    count: z.ZodOptional<z.ZodNumber>;
    intervalSec: z.ZodOptional<z.ZodNumber>;
    minSpacingSec: z.ZodOptional<z.ZodNumber>;
    strategy: z.ZodOptional<z.ZodEnum<{
        label: "label";
        expression: "expression";
        mixed: "mixed";
    }>>;
    model: z.ZodOptional<z.ZodString>;
    detail: z.ZodOptional<z.ZodEnum<{
        low: "low";
        high: "high";
    }>>;
    fontFile: z.ZodOptional<z.ZodString>;
    fontSize: z.ZodOptional<z.ZodNumber>;
    fontColor: z.ZodOptional<z.ZodString>;
    outlineColor: z.ZodOptional<z.ZodString>;
    position: z.ZodOptional<z.ZodEnum<{
        top: "top";
        center: "center";
        bottom: "bottom";
    }>>;
    width: z.ZodOptional<z.ZodNumber>;
}, z.core.$strip>;
interface VariantPick {
    frame: ExtractedFrame;
    score: ShotScore;
}
/**
 * compose_thumbnail_variants — generate N thumbnails for A/B testing.
 *
 * Samples frames at `intervalSec`, scores via vision rubric, picks the
 * top-N spaced ≥ minSpacingSec apart, burns the headline. YouTube
 * native A/B is now standard — variants beat single guesses.
 *
 * Strategies:
 *   - "mixed"      (default): 3 distinct frames, same label.
 *   - "expression": same as mixed — picked separately for face-driven
 *     content where the agent wants to emphasise expression variation.
 *   - "label":     ONE best frame, 3 LLM-generated label variations.
 *     Use when the source only has one usable visual.
 */
export declare function createComposeThumbnailVariantsTool(cwd: string): AgentTool<typeof ComposeThumbnailVariantsParams>;
/**
 * Greedy top-N selection with minimum spacing. Sort by score desc, walk
 * the list, accept a candidate only if it's ≥ minSpacingSec away from
 * every already-accepted pick. Stable — ties preserve input order.
 *
 * Pure — exported for testing.
 */
export declare function pickTopSpaced(paired: VariantPick[], count: number, minSpacingSec: number): VariantPick[];
/**
 * Ask the LLM for N label variations. Pure-ish (network call) — exported
 * for testing under a mocked fetch.
 */
export declare function generateLabelVariations(headline: string, n: number, opts?: {
    apiKey?: string;
    model?: string;
    signal?: AbortSignal;
}): Promise<string[]>;
export {};
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