import type { Dimensions, QualityLevel } from "../../../core/domain/types.js";
import type { IBackgroundSystem } from "../../../core/contracts/IBackgroundSystem.js";
import type { EmberLayers, EmberStats } from "../domain/models/ember-models.js";
import { type HeatIntensity, type DensityPreset } from "../domain/constants/ember-constants.js";
/**
 * Ember Background System
 *
 * Orchestrates four particle subsystems:
 * - Smoke: Dark, slow-rising particles for depth
 * - Embers: Glowing orange/amber particles with flicker
 * - Sparks: Small, bright, fast particles
 *
 * Supports heat intensity (affects all subsystems), density presets,
 * quality levels, layer visibility, and accessibility settings.
 */
export declare class EmberBackgroundSystem implements IBackgroundSystem {
    private quality;
    private heatIntensity;
    private densityPreset;
    private isInitialized;
    private dimensions;
    private motionMultiplier;
    private breathingPhase;
    private readonly breathingPeriod;
    private readonly breathingAmplitude;
    private layers;
    private readonly gradientStops;
    initialize(dimensions: Dimensions, quality: QualityLevel): void;
    update(dimensions: Dimensions, frameMultiplier?: number): void;
    draw(ctx: CanvasRenderingContext2D, dimensions: Dimensions): void;
    /**
     * Draw breathing overlay - a warm color wash that pulses visibly
     * A+ Enhancement: Stronger, more noticeable breathing effect
     */
    private drawBreathingOverlay;
    /**
     * Draw a warm radial glow emanating from bottom center
     */
    private drawBottomGlow;
    /**
     * Draw a vignette effect (darkens edges, pulses with breathing)
     * A+ Enhancement: Vignette pulses subtly with the breathing effect
     */
    private drawVignette;
    setQuality(quality: QualityLevel): void;
    setAccessibility(settings: {
        reducedMotion: boolean;
        highContrast: boolean;
    }): void;
    handleResize(oldDimensions: Dimensions, newDimensions: Dimensions): void;
    cleanup(): void;
    /**
     * Set layer visibility
     */
    setLayerVisibility(layers: Partial<EmberLayers>): void;
    /**
     * Get current scene statistics
     */
    getStats(): EmberStats;
    /**
     * Set heat intensity level
     * Affects ember colors, speed, glow, and spark bonus
     */
    setHeatIntensity(intensity: HeatIntensity): void;
    /**
     * Set density preset
     * Multiplies all particle counts
     */
    setDensityPreset(preset: DensityPreset): void;
}
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