/**
 * Easter Egg System
 *
 * Adds delightful ambient details that reward attentive viewers:
 * - Owl silhouettes perched in trees
 * - Bat flocks that occasionally fly across
 * - Moon glow effects
 * - Shooting stars
 * - Glowing eyes in darkness
 */
export type EasterEggType = "owl" | "bat" | "moon" | "shootingStar" | "glowingEyes";
export interface OwlSilhouette {
    id: string;
    x: number;
    y: number;
    scale: number;
    facing: "left" | "right";
    blinking: boolean;
    blinkTimer: number;
    headTilt: number;
    silhouettePoints: Array<{
        x: number;
        y: number;
    }>;
}
export interface Bat {
    id: string;
    x: number;
    y: number;
    velocityX: number;
    velocityY: number;
    wingPhase: number;
    scale: number;
}
export interface BatFlock {
    id: string;
    bats: Bat[];
    active: boolean;
    startTime: number;
}
export interface MoonGlow {
    x: number;
    y: number;
    radius: number;
    glowRadius: number;
    phase: number;
    visible: boolean;
}
export interface ShootingStar {
    id: string;
    startX: number;
    startY: number;
    endX: number;
    endY: number;
    progress: number;
    speed: number;
    tailLength: number;
    active: boolean;
}
export interface GlowingEyes {
    id: string;
    x: number;
    y: number;
    separation: number;
    blinkPhase: number;
    intensity: number;
    color: string;
}
export interface EasterEggConfig {
    owlEnabled: boolean;
    maxOwls: number;
    owlBlinkInterval: number;
    batEnabled: boolean;
    batFlockSize: number;
    batSpawnChance: number;
    batSpeed: number;
    moonEnabled: boolean;
    moonPhase: number;
    moonX: number;
    moonY: number;
    shootingStarsEnabled: boolean;
    shootingStarChance: number;
    glowingEyesEnabled: boolean;
    maxGlowingEyes: number;
}
export declare class EasterEggSystem {
    private config;
    private noise;
    private width;
    private height;
    private owls;
    private batFlocks;
    private moon;
    private shootingStars;
    private glowingEyes;
    private idCounter;
    private time;
    constructor(width: number, height: number, config?: Partial<EasterEggConfig>, seed?: number);
    private initializeStaticElements;
    private createMoon;
    private createGlowingEyes;
    /**
     * Add an owl at a specific position (called by composer when placing trees)
     */
    addOwl(x: number, y: number, scale?: number): OwlSilhouette | null;
    private generateOwlSilhouette;
    /**
     * Update all easter eggs
     * @param deltaTime Seconds since last update
     */
    update(deltaTime: number): void;
    private updateOwls;
    private updateBatFlocks;
    private updateShootingStars;
    private updateGlowingEyes;
    private checkForNewEvents;
    private spawnBatFlock;
    private spawnShootingStar;
    getOwls(): OwlSilhouette[];
    getBatFlocks(): BatFlock[];
    getMoon(): MoonGlow;
    getShootingStars(): ShootingStar[];
    getGlowingEyes(): GlowingEyes[];
    /**
     * Get bat wing points for current wing phase
     */
    getBatWingPoints(bat: Bat): {
        body: Array<{
            x: number;
            y: number;
        }>;
        leftWing: Array<{
            x: number;
            y: number;
        }>;
        rightWing: Array<{
            x: number;
            y: number;
        }>;
    };
    /**
     * Resize system
     */
    resize(width: number, height: number): void;
    setConfig(config: Partial<EasterEggConfig>): void;
    getConfig(): EasterEggConfig;
    getStats(): {
        owls: number;
        activeBatFlocks: number;
        totalBats: number;
        activeShootingStars: number;
        glowingEyes: number;
    };
}
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