/**
 * PPT Utilities
 *
 * Contains provider utilities and helper functions for PPT generation.
 *
 * @module ppt/utils
 */
import type { PPTGenerationContext, AspectRatioOption, EffectivePPTProviderResult, ImageValidationResult, TextSegment, LogoConfig, GenerateOptions } from "../../types/index.js";
/**
 * Extract PPT generation context from GenerateOptions
 */
export declare function extractPPTContext(options: GenerateOptions): PPTGenerationContext;
/**
 * Valid providers for PPT generation.
 * These providers support structured output capabilities required for content planning.
 */
export declare const PPT_VALID_PROVIDERS: readonly string[];
/**
 * Get an effective PPT provider - handles all orchestration logic
 */
export declare function getEffectivePPTProvider(currentProvider: unknown, currentProviderName: string, currentModelName: string, neurolink?: unknown): Promise<EffectivePPTProviderResult>;
/**
 * Generate output file path for PPT
 */
export declare function generateOutputPath(context: PPTGenerationContext): string;
/**
 * Ensure output directory exists
 */
export declare function ensureOutputDirectory(filePath: string): Promise<void>;
/**
 * Check if value is a non-null object
 */
export declare function isObject(value: unknown): value is Record<string, unknown>;
/**
 * Type guard for LogoConfig
 */
export declare function isLogoConfig(logo: unknown): logo is LogoConfig;
/**
 * Convert LogoConfig or Buffer/string to normalized format
 */
export declare function normalizeLogoConfig(logo: Buffer | string | LogoConfig | null): LogoConfig | null;
/**
 * Get pptxgenjs layout name from aspect ratio
 */
export declare function getLayoutName(aspectRatio: AspectRatioOption): "LAYOUT_16x9" | "LAYOUT_4x3";
/**
 * Convert unknown error to Error instance
 */
export declare function toError(error: unknown): Error;
/**
 * Determine which stage failed based on orchestration state
 */
export declare function getFailureStage(state: {
    contentPlan: unknown;
    slides: unknown;
    outputPath: unknown;
}): string;
/**
 * Validate an image buffer and determine its MIME type
 */
export declare function validateImageBuffer(buffer: Buffer | undefined): ImageValidationResult;
/**
 * Convert image buffer to data URL for pptxgenjs
 */
export declare function bufferToDataUrl(buffer: Buffer): string | null;
/**
 * Parse markdown-style formatting in text and return formatted segments
 * Supports: **bold**, *italic*, ***bold italic***
 *
 * @example
 * parseMarkdownText("Hello **world**")
 * // Returns: [{ text: "Hello " }, { text: "world", bold: true }]
 */
export declare function parseMarkdownText(text: string): TextSegment[];
/**
 * Check if text contains markdown formatting
 */
export declare function hasMarkdownFormatting(text: string): boolean;
/**
 * Convert parsed text segments to pptxgenjs text runs array
 * This allows mixed formatting within a single bullet point
 */
export declare function createFormattedTextProps(segments: TextSegment[], baseOptions: {
    fontSize: number;
    fontFace: string;
    color: string;
    baseBold?: boolean;
}): Array<{
    text: string;
    options: Record<string, unknown>;
}>;
/**
 * Calculate font size based on bullet count
 * More bullets = smaller font to fit content
 *
 * Formula:
 * - 1-5 bullets: baseFontSize (18pt)
 * - 6-7 bullets: baseFontSize - 2 (16pt)
 * - 8-10 bullets: baseFontSize - 4 (14pt)
 * - 10+ bullets: cap at 12pt minimum
 */
export declare function calculateFontSize(bulletCount: number, baseFontSize?: number): number;