import type { LiveQualityTier } from '@/scene/types';

export interface RenderQualitySettings {
  pixelRatio: number;
  roadSegments: number;
  terrainSegments: number;
  terrainOctaves: 1 | 2 | 3;
  starCount: number;
  streakCount: number;
  postScale: number;
  postEffects: boolean;
}

const settings: Readonly<Record<LiveQualityTier, Omit<RenderQualitySettings, 'pixelRatio'> & { dprCap: number }>> = {
  high: {
    dprCap: 1.5,
    roadSegments: 224,
    terrainSegments: 112,
    terrainOctaves: 3,
    starCount: 760,
    streakCount: 112,
    postScale: 1,
    postEffects: true,
  },
  medium: {
    dprCap: 1.5,
    roadSegments: 168,
    terrainSegments: 80,
    terrainOctaves: 2,
    starCount: 420,
    streakCount: 64,
    postScale: 0.7,
    postEffects: true,
  },
  low: {
    dprCap: 1.25,
    roadSegments: 112,
    terrainSegments: 48,
    terrainOctaves: 1,
    starCount: 160,
    streakCount: 28,
    postScale: 0,
    postEffects: false,
  },
};

export function renderQualityFor(
  tier: LiveQualityTier,
  devicePixelRatio: number,
  mobileOrTablet: boolean,
): RenderQualitySettings {
  const selected = settings[tier];
  const finiteDpr = Number.isFinite(devicePixelRatio) ? Math.max(1, devicePixelRatio) : 1;
  return {
    pixelRatio: Math.min(finiteDpr, selected.dprCap, mobileOrTablet ? 1.5 : 2),
    roadSegments: selected.roadSegments,
    terrainSegments: selected.terrainSegments,
    terrainOctaves: selected.terrainOctaves,
    starCount: selected.starCount,
    streakCount: selected.streakCount,
    postScale: selected.postScale,
    postEffects: selected.postEffects,
  };
}