/**
 * Calculate optimal number of spins based on prize count and duration
 * More prizes = fewer spins to avoid very long animations
 * Shorter duration = fewer spins for better performance
 *
 * @param prizesLength - Total number of prizes
 * @param duration - Animation duration in milliseconds
 * @returns Optimal number of complete spins
 */
export declare const calculateOptimalSpins: (prizesLength: number, duration: number) => number;
/**
 * Calculate the offset needed to position the winning prize in the center
 * Includes multiple full rotations for a realistic lottery/roulette effect
 *
 * @param prizeSize - Size of each prize item (width or height depending on orientation)
 * @param winningIndex - Index of the winning prize
 * @param containerSize - Size of the container viewport
 * @param prizesLength - Total number of prizes in the array
 * @param minSpins - Minimum number of complete spins before landing (default: 5)
 * @returns Offset in pixels
 */
export declare const calculateOffset: (prizeSize: number, winningIndex: number, containerSize: number, prizesLength: number, minSpins?: number) => number;
/**
 * Validate that the winning index is within bounds
 *
 * @param winningIndex - Index to validate
 * @param prizesLength - Total number of prizes
 * @throws Error if index is invalid
 */
export declare const validateWinningIndex: (winningIndex: number, prizesLength: number) => void;
/**
 * Generate a unique ID for React keys
 * Uses crypto.randomUUID if available, falls back to timestamp + random
 *
 * @returns Unique string ID
 */
export declare const generateId: () => string;
/**
 * Clamp a number between min and max values
 *
 * @param value - Value to clamp
 * @param min - Minimum value
 * @param max - Maximum value
 * @returns Clamped value
 */
export declare const clamp: (value: number, min: number, max: number) => number;
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