"use strict";

class TarinaiPerformanceManager {
  constructor() {
    this.fps = 60;
    this.level = 0;
    this.lastLevel = 0;
    this.samples = [];
    this.sampleLimit = 20;
  }

  updateFps(fps, worldRef = null) {
    const n = Number(fps);
    if (!Number.isFinite(n) || n <= 0) return this.level;
    this.samples.push(n);
    if (this.samples.length > this.sampleLimit) this.samples.shift();
    const avg = this.samples.reduce((a, b) => a + b, 0) / this.samples.length;
    this.fps = Math.round(avg);
    const next = this.computeLevel(avg);
    if (next !== this.level) {
      this.lastLevel = this.level;
      this.level = next;
      window.TarinaiEvents?.emit("performance:level", { level: this.level, previous: this.lastLevel, fps: this.fps, world: worldRef || null });
    }
    return this.level;
  }

  computeLevel(fps = this.fps) {
    if (!fps || !Number.isFinite(fps)) return 0;
    if (fps < 22) return 3;
    if (fps < 34) return 2;
    if (fps < 48) return 1;
    return 0;
  }

  quality(worldRef = null) {
    const level = this.level;
    let antCount = 0;
    for (const ant of worldRef?.ants || []) if (ant && !ant.dead) antCount += 1;
    const itemCount = (worldRef?.items || []).length || 0;
    const effectCount = (worldRef?.effects || []).length || 0;
    const antStride = antCount >= 95 || level >= 3 ? 3 : (antCount >= 35 || level >= 2 ? 2 : 1);
    return {
      fps: this.fps,
      level,
      antStride,
      itemCount,
      antCount,
      effectCount,
      effectLimit: level >= 3 ? 34 : level >= 2 ? 52 : level >= 1 ? 68 : 88,
      statsInterval: level >= 3 ? 1.20 : level === 2 ? 0.92 : level === 1 ? 0.68 : 0.48,
      terrainRedrawInterval: level >= 3 ? 1.30 : level === 2 ? 1.05 : level === 1 ? 0.82 : 0.62,
      backgroundLightStep: level >= 3 ? 64 : level === 2 ? 96 : 180,
      uiUpdateInterval: level >= 3 ? 1.2 : level === 2 ? 0.9 : level === 1 ? 0.65 : 0.45,
    };
  }

  debugSnapshot(worldRef = null) {
    return { version: window.TARINAI_VERSION || "", fps: this.fps, level: this.level, quality: this.quality(worldRef) };
  }
}

window.TarinaiPerformance = window.TarinaiPerformance || new TarinaiPerformanceManager();