/**
 * Achievement System
 *
 * Manages achievements and unlocks with support for:
 * - Achievement tracking
 * - Progress tracking
 * - Hidden achievements
 * - Achievement categories
 * - Points system
 * - Event notifications
 */
import type { Achievement, EventHandler } from './types';
/**
 * Achievement system for managing player achievements
 */
export declare class AchievementSystem {
    private achievements;
    private eventHandlers;
    /**
     * Add an achievement
     */
    addAchievement(achievement: Omit<Achievement, 'id' | 'unlocked'> & {
        id?: string;
    }): string;
    /**
     * Get an achievement by ID
     */
    getAchievement(achievementId: string): Achievement | undefined;
    /**
     * Get all achievements (respects hidden flag)
     */
    getAllAchievements(): Achievement[];
    /**
     * Get achievements by category
     */
    getAchievementsByCategory(category: string): Achievement[];
    /**
     * Get achievements by rarity
     */
    getAchievementsByRarity(rarity: Achievement['rarity']): Achievement[];
    /**
     * Get unlocked achievements
     */
    getUnlockedAchievements(): Achievement[];
    /**
     * Get locked achievements (not hidden ones)
     */
    getLockedAchievements(): Achievement[];
    /**
     * Unlock an achievement
     */
    unlock(achievementId: string): boolean;
    /**
     * Update achievement progress
     */
    updateProgress(achievementId: string, progress: number): boolean;
    /**
     * Increment achievement progress
     */
    incrementProgress(achievementId: string, delta?: number): boolean;
    /**
     * Check if achievement is unlocked
     */
    isUnlocked(achievementId: string): boolean;
    /**
     * Get achievement progress (0-1)
     */
    getProgress(achievementId: string): number;
    /**
     * Get total points earned
     */
    getTotalPoints(): number;
    /**
     * Get maximum possible points
     */
    getMaxPoints(): number;
    /**
     * Get unlock percentage
     */
    getUnlockPercentage(): number;
    /**
     * Remove an achievement
     */
    removeAchievement(achievementId: string): boolean;
    /**
     * Reset an achievement
     */
    resetAchievement(achievementId: string): boolean;
    /**
     * Clear all achievements
     */
    clear(): void;
    /**
     * Export achievements state
     */
    export(): Achievement[];
    /**
     * Import achievements state
     */
    import(achievements: Achievement[]): void;
    /**
     * Register event handler
     */
    on(eventType: string, handler: EventHandler): void;
    /**
     * Unregister event handler
     */
    off(eventType: string, handler: EventHandler): void;
    /**
     * Emit event
     */
    private emit;
}
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