/**
 * IdleBehaviorSystem.ts
 *
 * Procedural idle facial/body signals for character rigs:
 * - Chest rise/fall breathing cycle
 * - Nostril flare coupled to inhale phase
 * - Eyelid blink cycle
 * - Micro-saccade gaze offsets
 *
 * This system is intentionally armature-binding dependent. If no usable
 * bindings are provided, output channels remain neutral.
 */
export interface IdleArmatureBindings {
    /** Bone name used for breathing chest expansion. */
    chestBone?: string;
    /** Blend-shape/morph key for left eye blink. */
    eyelidLeft?: string;
    /** Blend-shape/morph key for right eye blink. */
    eyelidRight?: string;
    /** Blend-shape/morph key for nostril flare. */
    nostrilFlare?: string;
}
export interface IdleBehaviorConfig {
    /** Breaths per minute. Default 12. */
    breathsPerMinute?: number;
    /** Peak chest expansion scale delta. Default 0.035. */
    chestAmplitude?: number;
    /** Peak nostril flare weight. Default 0.22. */
    nostrilAmplitude?: number;
    /** Blink interval range in seconds. Default [2.4, 5.2]. */
    blinkIntervalRangeSec?: [number, number];
    /** Blink close+open duration in seconds. Default 0.12. */
    blinkDurationSec?: number;
    /** Micro-saccade interval range in seconds. Default [0.7, 1.6]. */
    microSaccadeIntervalRangeSec?: [number, number];
    /** Micro-saccade angular amplitude in normalized gaze units. Default 0.03. */
    microSaccadeAmplitude?: number;
    /** Deterministic RNG injection for testing. Default Math.random. */
    random?: () => number;
}
export interface IdleBehaviorFrame {
    /** Absolute per-bone scale multipliers. */
    boneScale: Record<string, number>;
    /** Morph/blend-shape weights in [0, 1]. */
    morphWeights: Record<string, number>;
    /** Normalized micro-saccade gaze offset. */
    gazeOffset: {
        x: number;
        y: number;
    };
    /** Normalized blink amount [0, 1]. */
    blink: number;
    /** Normalized breath phase signal [-1, 1]. */
    breath: number;
}
export declare class IdleBehaviorSystem {
    private readonly bindings;
    private readonly config;
    private readonly rnd;
    private elapsedSec;
    private nextBlinkSec;
    private blinkT;
    private nextSaccadeSec;
    private saccadeTarget;
    private gaze;
    constructor(bindings: IdleArmatureBindings, config?: IdleBehaviorConfig);
    /** Force an immediate blink cycle. Useful for deterministic tests and scripted beats. */
    triggerBlink(): void;
    update(deltaSec: number): IdleBehaviorFrame;
    private computeFrame;
    private computeBlinkWeight;
    private scheduleNextBlink;
    private scheduleNextSaccade;
}
export declare function createIdleBehaviorSystem(bindings: IdleArmatureBindings, config?: IdleBehaviorConfig): IdleBehaviorSystem;
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