/**
 * stealth-engine.js — Motor de Stealth Completo para Zelin
 * ==========================================================
 * Basado en investigación real 2025-2026:
 *
 * HALLAZGO CLAVE: "Blocking or randomizing canvas fingerprinting is easily detected
 * because the fingerprint changes on every page load, which is itself suspicious.
 * Natural fingerprints that match real device configurations are superior."
 * — Multilogin Research, 2025
 *
 * HALLAZGO CLAVE 2: "BotBrowser's key advantage: Canvas, WebGL, AudioContext,
 * and Fonts must be CONSISTENT across the session. Inconsistencies instantly
 * expose fake fingerprints."
 * — GeeTest Anti-Bot Research, Nov 2025
 *
 * ESTRATEGIA: Fingerprint consistente + realista, NO aleatorio en cada request
 *   → Generar UNA identidad de dispositivo por sesión
 *   → Mantenerla IDÉNTICA en todas las páginas de esa sesión
 *   → Que corresponda a una configuración de hardware que PODRÍA EXISTIR
 */

import { createHash } from 'crypto';

// ── Pool de configuraciones reales de dispositivos ───────────────────────────
// Extraídas de datasets de fingerprints reales (BrowserLeaks, CreepJS stats 2025)
// CRÍTICO: cada configuración debe ser INTERNAMENTE CONSISTENTE
// (GPU vendor debe coincidir con canvas output, etc.)

const REAL_DEVICE_CONFIGS = [
  {
    // Windows 11 + Chrome 120 + Intel UHD 770 (configuración más común ~18% de usuarios)
    platform       : 'Win32',
    oscpu          : 'Windows NT 10.0',
    vendor         : 'Google Inc.',
    renderer       : 'ANGLE (Intel, Intel(R) UHD Graphics 770 Direct3D11 vs_5_0 ps_5_0, D3D11)',
    vendorUnmasked : 'Intel',
    rendererUnmasked: 'Intel(R) UHD Graphics 770',
    hardwareConcurrency: 8,
    deviceMemory   : 8,
    maxTouchPoints : 0,
    screenRes      : [1920, 1080],
    colorDepth     : 24,
    pixelRatio     : 1,
    timezone       : 'America/Mexico_City',
    language       : 'es-MX',
    fonts          : ['Arial', 'Calibri', 'Cambria', 'Comic Sans MS', 'Consolas', 'Courier New', 'Georgia', 'Segoe UI', 'Tahoma', 'Times New Roman', 'Trebuchet MS', 'Verdana'],
    plugins        : ['Chrome PDF Plugin', 'Chrome PDF Viewer', 'Native Client'],
    chromeVersion  : '120.0.6099.130',
    userAgent      : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
  },
  {
    // Windows 10 + Chrome 119 + NVIDIA RTX 3060 (gamer setup)
    platform       : 'Win32',
    oscpu          : 'Windows NT 10.0',
    vendor         : 'Google Inc.',
    renderer       : 'ANGLE (NVIDIA, NVIDIA GeForce RTX 3060 Direct3D11 vs_5_0 ps_5_0, D3D11)',
    vendorUnmasked : 'NVIDIA Corporation',
    rendererUnmasked: 'NVIDIA GeForce RTX 3060',
    hardwareConcurrency: 12,
    deviceMemory   : 16,
    maxTouchPoints : 0,
    screenRes      : [2560, 1440],
    colorDepth     : 24,
    pixelRatio     : 1,
    timezone       : 'America/Mexico_City',
    language       : 'es-MX',
    fonts          : ['Arial', 'Calibri', 'Cambria', 'Consolas', 'Courier New', 'Georgia', 'Impact', 'Segoe UI', 'Tahoma', 'Times New Roman', 'Verdana'],
    plugins        : ['Chrome PDF Plugin', 'Chrome PDF Viewer'],
    chromeVersion  : '119.0.6045.200',
    userAgent      : 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36',
  },
  {
    // macOS 14 + Chrome 120 + Apple M2
    platform       : 'MacIntel',
    oscpu          : 'Intel Mac OS X 10_15_7',
    vendor         : 'Google Inc.',
    renderer       : 'ANGLE (Apple, ANGLE Metal Renderer: Apple M2, Unspecified Version)',
    vendorUnmasked : 'Apple',
    rendererUnmasked: 'Apple M2',
    hardwareConcurrency: 8,
    deviceMemory   : 8,
    maxTouchPoints : 0,
    screenRes      : [2560, 1664],
    colorDepth     : 30,
    pixelRatio     : 2,
    timezone       : 'America/Mexico_City',
    language       : 'es-MX',
    fonts          : ['Arial', 'Courier New', 'Geneva', 'Georgia', 'Helvetica', 'Monaco', 'Times New Roman', 'Verdana'],
    plugins        : ['Chrome PDF Plugin', 'Chrome PDF Viewer'],
    chromeVersion  : '120.0.6099.129',
    userAgent      : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
  },
];

// ── Generar identidad de sesión (una sola vez, CONSISTENTE toda la sesión) ───
let _sessionIdentity = null;

export function generateSessionIdentity(seed = null) {
  if (_sessionIdentity && !seed) return _sessionIdentity;

  // Seleccionar configuración base (misma para toda la sesión)
  const configIndex = seed
    ? parseInt(createHash('md5').update(seed).digest('hex').slice(0, 2), 16) % REAL_DEVICE_CONFIGS.length
    : Math.floor(Math.random() * REAL_DEVICE_CONFIGS.length);

  const base = REAL_DEVICE_CONFIGS[configIndex];

  // Añadir variación SUTIL y CONSISTENTE (mismos valores toda la sesión)
  const sessionSeed = seed || Date.now().toString();
  const noise = (str, range) => {
    const h = parseInt(createHash('md5').update(str + sessionSeed).digest('hex').slice(0, 4), 16);
    return (h % (range * 2)) - range;
  };

  _sessionIdentity = {
    ...base,
    // Pequeña variación en resolución de pantalla (±8px) — realista
    screenRes: [
      base.screenRes[0] + noise('sw', 8),
      base.screenRes[1] + noise('sh', 8),
    ],
    // Variación en memoria (+/- una banda) — realista
    deviceMemory: base.deviceMemory,
    // Canvas noise value — fijo para toda la sesión (no cambia entre páginas)
    canvasNoise: noise('canvas', 3) * 0.001,
    audioNoise : noise('audio', 5) * 0.0001,
    sessionId  : sessionSeed,
  };

  return _sessionIdentity;
}

export function resetSessionIdentity() {
  _sessionIdentity = null;
}

// ── Script de inyección completo ─────────────────────────────────────────────
// Se inyecta ANTES de que cualquier script de la página se ejecute
export function generateStealthScript(identity) {
  const id = identity || generateSessionIdentity();

  return `
(function() {
  'use strict';

  // ── 1. Ocultar webdriver completamente ─────────────────────────────────────
  Object.defineProperty(navigator, 'webdriver', { get: () => undefined, configurable: false });
  delete window.navigator.__proto__.webdriver;

  // ── 2. Chrome runtime y permisos (ausentes en headless real) ──────────────
  if (!window.chrome) {
    window.chrome = {
      app: { isInstalled: false, getDetails: function() {}, getIsInstalled: function() {}, runningState: function() { return 'cannot_run'; } },
      runtime: {
        onMessage: { addListener: function() {}, removeListener: function() {}, hasListeners: function() { return false; } },
        connect: function() { return { onMessage: { addListener: function() {} }, onDisconnect: { addListener: function() {} }, postMessage: function() {} }; },
        sendMessage: function() {},
        id: undefined,
      },
      loadTimes: function() { return { commitLoadTime: ${Date.now() / 1000 - 1.2 - Math.random()}, connectionInfo: 'http/1.1', finishDocumentLoadTime: 0, finishLoadTime: 0, firstPaintAfterLoadTime: 0, firstPaintTime: 0, navigationType: 'Other', npnNegotiatedProtocol: 'unknown', requestTime: ${Date.now() / 1000 - 1.5 - Math.random()}, startLoadTime: ${Date.now() / 1000 - 1.4 - Math.random()}, wasAlternateProtocolAvailable: false, wasFetchedViaSpdy: false, wasNpnNegotiated: false }; },
      csi: function() { return { onloadT: ${Date.now() - 800}, pageT: 1500, startE: ${Date.now() - 1200}, tran: 15 }; },
    };
  }

  // ── 3. Navigator properties — CONSISTENTES con el perfil ─────────────────
  const navigatorProps = {
    platform           : '${id.platform}',
    vendor             : '${id.vendor}',
    hardwareConcurrency: ${id.hardwareConcurrency},
    deviceMemory       : ${id.deviceMemory},
    maxTouchPoints     : ${id.maxTouchPoints},
    languages          : ['${id.language}', '${id.language.split('-')[0]}', 'en'],
    language           : '${id.language}',
    plugins            : { length: ${id.plugins.length} },
    mimeTypes          : { length: 4 },
    doNotTrack         : null,
  };
  for (const [key, value] of Object.entries(navigatorProps)) {
    try {
      Object.defineProperty(navigator, key, { get: () => value, configurable: true });
    } catch(e) {}
  }

  // ── 4. Canvas fingerprint — ruido CONSISTENTE (mismo en cada carga) ────────
  // CRÍTICO: NO aleatorio en cada llamada, sino fijo para la sesión
  const CANVAS_NOISE = ${id.canvasNoise};
  const _origToDataURL = HTMLCanvasElement.prototype.toDataURL;
  const _origGetImageData = CanvasRenderingContext2D.prototype.getImageData;

  HTMLCanvasElement.prototype.toDataURL = function(type, quality) {
    const result = _origToDataURL.apply(this, arguments);
    // Solo añadir ruido si parece fingerprinting (canvas pequeño)
    if (this.width <= 300 && this.height <= 150) {
      try {
        const ctx = this.getContext('2d');
        if (ctx) {
          const id = ctx.getImageData(0, 0, this.width, this.height);
          // Ruido imperceptible pero consistente
          for (let i = 0; i < id.data.length; i += 4) {
            id.data[i]   = Math.max(0, Math.min(255, id.data[i]   + Math.round(CANVAS_NOISE * 255)));
            id.data[i+1] = Math.max(0, Math.min(255, id.data[i+1] + Math.round(CANVAS_NOISE * 127)));
          }
          ctx.putImageData(id, 0, 0);
        }
      } catch(e) {}
    }
    return _origToDataURL.apply(this, arguments);
  };

  // ── 5. WebGL fingerprint — valores REALES del perfil ─────────────────────
  const _origGetParam = WebGLRenderingContext.prototype.getParameter;
  WebGLRenderingContext.prototype.getParameter = function(parameter) {
    if (parameter === 0x9245) return '${id.vendorUnmasked}';   // UNMASKED_VENDOR_WEBGL
    if (parameter === 0x9246) return '${id.rendererUnmasked}'; // UNMASKED_RENDERER_WEBGL
    if (parameter === 0x1F00) return '${id.vendor}';           // VENDOR
    if (parameter === 0x1F01) return '${id.renderer}';         // RENDERER
    return _origGetParam.apply(this, arguments);
  };

  // WebGL2 también
  try {
    const _origGetParam2 = WebGL2RenderingContext.prototype.getParameter;
    WebGL2RenderingContext.prototype.getParameter = function(parameter) {
      if (parameter === 0x9245) return '${id.vendorUnmasked}';
      if (parameter === 0x9246) return '${id.rendererUnmasked}';
      if (parameter === 0x1F00) return '${id.vendor}';
      if (parameter === 0x1F01) return '${id.renderer}';
      return _origGetParam2.apply(this, arguments);
    };
  } catch(e) {}

  // ── 6. Audio fingerprint — ruido consistente ──────────────────────────────
  const AUDIO_NOISE = ${id.audioNoise};
  try {
    const _origGetChanData = AudioBuffer.prototype.getChannelData;
    AudioBuffer.prototype.getChannelData = function(channel) {
      const data = _origGetChanData.apply(this, arguments);
      for (let i = 0; i < data.length; i += 100) {
        data[i] += AUDIO_NOISE;
      }
      return data;
    };
  } catch(e) {}

  // ── 7. Timing attacks — usar valores realistas ────────────────────────────
  const _origNow = Date.now;
  const timeOffset = ${Math.floor(Math.random() * 200) - 100};
  // Solo añadir offset mínimo para no romper lógica de timers
  // Date.now = function() { return _origNow() + timeOffset; }; // deshabilitado: rompe demasiado

  // ── 8. Permissions API — igual que Chrome real ────────────────────────────
  if (navigator.permissions) {
    const _origQuery = navigator.permissions.query.bind(navigator.permissions);
    navigator.permissions.query = async function(params) {
      if (params.name === 'notifications') return { state: Notification.permission, onchange: null };
      return _origQuery(params);
    };
  }

  // ── 9. Screen properties consistentes ────────────────────────────────────
  try {
    Object.defineProperty(screen, 'width',  { get: () => ${id.screenRes[0]}, configurable: true });
    Object.defineProperty(screen, 'height', { get: () => ${id.screenRes[1]}, configurable: true });
    Object.defineProperty(screen, 'availWidth',  { get: () => ${id.screenRes[0]}, configurable: true });
    Object.defineProperty(screen, 'availHeight', { get: () => ${id.screenRes[1] - 40}, configurable: true });
    Object.defineProperty(screen, 'colorDepth',  { get: () => ${id.colorDepth}, configurable: true });
    Object.defineProperty(window, 'devicePixelRatio', { get: () => ${id.pixelRatio}, configurable: true });
  } catch(e) {}

  // ── 10. Eliminar rastros de Playwright/CDP ────────────────────────────────
  try {
    delete window.cdc_adoQpoasnfa76pfcZLmcfl_Array;
    delete window.cdc_adoQpoasnfa76pfcZLmcfl_Promise;
    delete window.cdc_adoQpoasnfa76pfcZLmcfl_Symbol;
    delete window.__playwright;
    delete window.__pw_manual;
    delete window.__PW_inspect;
  } catch(e) {}

  // ── 11. iframe contentWindow stealth ─────────────────────────────────────
  // Anti-bot checks en iframes (como Cloudflare Turnstile)
  const _origContentWindow = Object.getOwnPropertyDescriptor(HTMLIFrameElement.prototype, 'contentWindow');
  if (_origContentWindow) {
    Object.defineProperty(HTMLIFrameElement.prototype, 'contentWindow', {
      get: function() {
        const cw = _origContentWindow.get.call(this);
        if (!cw) return null;
        try {
          Object.defineProperty(cw.navigator, 'webdriver', { get: () => undefined, configurable: true });
        } catch(e) {}
        return cw;
      },
      configurable: true,
    });
  }

  // ── 12. Ocultar stack traces de automation ────────────────────────────────
  // Algunos sites detectan errores con stack traces de Playwright
  const _origPrepareStackTrace = Error.prepareStackTrace;
  Error.prepareStackTrace = function(err, stack) {
    const filtered = stack.filter(frame => {
      const name = frame.getFileName?.() || '';
      return !name.includes('playwright') && !name.includes('puppeteer') && !name.includes('@playwright');
    });
    return _origPrepareStackTrace ? _origPrepareStackTrace(err, filtered) : filtered.map(f => f.toString()).join('\n');
  };

  window._stealthApplied = true;
  window._sessionId = '${id.sessionId}';
})();
`;
}

export function getIdentityStats(identity) {
  const id = identity || generateSessionIdentity();
  return {
    platform  : id.platform,
    renderer  : id.rendererUnmasked,
    screen    : id.screenRes.join('x'),
    language  : id.language,
    userAgent : id.userAgent.slice(0, 60) + '...',
  };
}