"use strict";

(function (global) {
  const nowMs = () => (global.performance?.now ? global.performance.now() : Date.now());
  const debugEnabled = (() => {
    try {
      const params = new URLSearchParams(global.location?.search || "");
      return params.get("debug") === "1" || params.get("debug") === "true" || params.get("perf") === "1";
    } catch (_) {
      return false;
    }
  })();

  const buckets = new Map();
  const stack = [];
  const metrics = new Map();
  let frameOpen = null;
  let frameCount = 0;
  let lastSmoothAt = 0;
  const storageKey = "tarinai_visual_settings_v1";
  const allowed = {
    effects: new Set(["off", "high"]),
    shadows: new Set(["off", "high"]),
    details: new Set(["low", "high"]),
  };
  const defaults = Object.freeze({ effects: "high", shadows: "high", details: "high" });
  let visualSettings = loadVisualSettings();
  let resizeRequested = false;

  function bucketFor(label) {
    let b = buckets.get(label);
    if (!b) {
      b = { label, ms: 0, selfMs: 0, avg: 0, selfAvg: 0, max: 0, calls: 0, last: 0, lastSelf: 0 };
      buckets.set(label, b);
    }
    return b;
  }

  function begin(label) {
    if (!debugEnabled) return null;
    const frame = { label: String(label || "unknown"), start: nowMs(), childMs: 0 };
    stack.push(frame);
    return () => {
      const top = stack.pop();
      const active = top === frame ? frame : top || frame;
      // If calls ended out of order, keep the profiler alive rather than throwing.
      if (top !== frame) {
        const idx = stack.lastIndexOf(frame);
        if (idx >= 0) stack.splice(idx, 1);
      }
      const elapsed = Math.max(0, nowMs() - active.start);
      const selfElapsed = Math.max(0, elapsed - (active.childMs || 0));
      if (stack.length) stack[stack.length - 1].childMs += elapsed;
      const b = bucketFor(active.label);
      b.ms += elapsed;
      b.selfMs += selfElapsed;
      b.calls += 1;
      b.last = elapsed;
      b.lastSelf = selfElapsed;
      if (elapsed > b.max) b.max = elapsed;
      return elapsed;
    };
  }

  function beginFrame() {
    frameOpen = nowMs();
    if (debugEnabled) stack.length = 0;
    return frameOpen;
  }

  function smoothBuckets() {
    if (!debugEnabled) return;
    for (const b of buckets.values()) {
      b.avg = b.avg ? b.avg * 0.82 + b.ms * 0.18 : b.ms;
      b.selfAvg = b.selfAvg ? b.selfAvg * 0.82 + b.selfMs * 0.18 : b.selfMs;
      b.ms = 0;
      b.selfMs = 0;
      b.calls = 0;
    }
  }

  function normalizeVisualSetting(key, value) {
    const raw = String(value || "");
    if (key === "effects" || key === "shadows") {
      if (raw === "off") return "off";
      if (raw === "on" || raw === "low" || raw === "mid" || raw === "high") return "high";
    }
    if (key === "details") {
      if (raw === "low") return "low";
      if (raw === "mid" || raw === "high") return "high";
    }
    return defaults[key];
  }

  function sanitizeVisualSettings(value) {
    const src = value && typeof value === "object" ? value : {};
    const next = { ...defaults };
    for (const key of Object.keys(defaults)) {
      const normalized = normalizeVisualSetting(key, src[key]);
      if (allowed[key]?.has(normalized)) next[key] = normalized;
    }
    return next;
  }

  function loadVisualSettings() {
    try {
      const raw = global.localStorage?.getItem(storageKey);
      return sanitizeVisualSettings(raw ? JSON.parse(raw) : null);
    } catch (_) {
      return { ...defaults };
    }
  }

  function saveVisualSettings() {
    try {
      global.localStorage?.setItem(storageKey, JSON.stringify(visualSettings));
    } catch (_) {}
  }

  function dprScaleForDetails(details) {
    if (details === "low") return 0.72;
    return 1;
  }

  function endFrame() {
    frameCount += 1;
    if (frameOpen != null && debugEnabled) {
      const elapsed = Math.max(0, nowMs() - frameOpen);
      const b = bucketFor("frame.total");
      b.ms += elapsed;
      b.selfMs += Math.max(0, elapsed - stack.reduce((sum, f) => sum + (f.childMs || 0), 0));
      b.calls += 1;
      b.last = elapsed;
      b.lastSelf = b.last;
      if (elapsed > b.max) b.max = elapsed;
    }
    frameOpen = null;
    if (debugEnabled) stack.length = 0;
    const t = nowMs();
    if (t - lastSmoothAt >= 750) {
      lastSmoothAt = t;
      smoothBuckets();
    }
  }

  function visualLevel(key, fallback = "high") {
    return visualSettings[key] || fallback;
  }

  function visualSettingsValue() {
    return { ...visualSettings };
  }

  function setVisualSetting(key, value) {
    if (!Object.prototype.hasOwnProperty.call(defaults, key)) return false;
    const nextValue = normalizeVisualSetting(key, value);
    if (!allowed[key]?.has(nextValue)) return false;
    if (visualSettings[key] === nextValue) return true;
    visualSettings = { ...visualSettings, [key]: nextValue };
    saveVisualSettings();
    if (key === "details") resizeRequested = true;
    return true;
  }

  function renderQualityTier() { return visualSettings.details; }
  function shadowQualityTier() { return visualSettings.shadows; }
  function dprScaleValue() { return dprScaleForDetails(visualSettings.details); }
  function consumeResizeRequest() {
    const v = resizeRequested;
    resizeRequested = false;
    return v;
  }

  function setMetric(name, value) {
    if (!debugEnabled) return;
    metrics.set(String(name || "metric"), value);
  }

  function snapshot() {
    const frameAvg = buckets.get("frame.total")?.avg || 0;
    const entries = [...buckets.values()].map(b => ({
      label: b.label,
      avg: Number((b.avg || 0).toFixed(2)),
      selfAvg: Number((b.selfAvg || 0).toFixed(2)),
      max: Number((b.max || 0).toFixed(2)),
      last: Number((b.last || 0).toFixed(2)),
      lastSelf: Number((b.lastSelf || 0).toFixed(2)),
      calls: b.calls || 0,
      pct: frameAvg > 0 ? Number((((b.avg || 0) / frameAvg) * 100).toFixed(0)) : 0,
      selfPct: frameAvg > 0 ? Number((((b.selfAvg || 0) / frameAvg) * 100).toFixed(0)) : 0,
    }));
    const topInclusive = entries.slice().sort((a, b) => b.avg - a.avg).slice(0, 12);
    const topSelf = entries.slice().sort((a, b) => b.selfAvg - a.selfAvg).slice(0, 12);
    return {
      enabled: debugEnabled,
      tier: visualSettings.details,
      visual: visualSettingsValue(),
      dprScale: dprScaleValue(),
      frameCount,
      frameAvg: Number(frameAvg.toFixed(2)),
      entries: topInclusive,
      topInclusive,
      topSelf,
      metrics: Object.fromEntries(metrics.entries()),
    };
  }

  global.TarinaiPerf = Object.freeze({
    begin,
    beginFrame,
    endFrame,
    renderQualityTier,
    shadowQualityTier,
    visualLevel,
    visualSettings: visualSettingsValue,
    setVisualSetting,
    dprScale: dprScaleValue,
    consumeResizeRequest,
    setMetric,
    snapshot,
  });
})(typeof window !== "undefined" ? window : globalThis);